Journal articles: 'Heat pipe solar collector'

1

Ismail, K. A. R., and M. M. Abogderah. "Performance of a Heat Pipe Solar Collector." Journal of Solar Energy Engineering 120, no. 1 (February 1, 1998): 51–59. http://dx.doi.org/10.1115/1.2888047.

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This paper presents a comparative study between theoretical predictions and experimental results of a flat-plate solar collector with heat pipes. The theoretical model for the heat pipe solar collector is based upon the method by Duffie and Beckman(1980), modified to use heat pipes for energy transport. The methanol filled heat pipes are self-contained devices whose evaporators are inserted under pressure in the flat plate of the solar collector and the heat exchange is carried out at their condensers. The evaporators contain a wick of one mesh layer to ensure a better distribution of the working fluid. The condensers are wickless and inclined 15 deg more than the inclination of the evaporators to facilitate the return of the condensate to the evaporators. The time constant of the heat pipe solar collector was calculated and found to be about 23 minutes. Also presented in this paper are comparative experimental results of the proposed solar collector and a conventional commercial solar collector. The two collectors were tested simultaneously. The instantaneous efficiencies of the heat pipe solar collector are lower than the conventional collector in the morning and higher when the heat pipes reach their operating temperatures.

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Yan, Hui Lei, Hua Zhang, and Qiu Ping Shao. "Comparative Studies on the Efficiency of Solar Flat-Plate Collector and Evacuated Tube Collector." Applied Mechanics and Materials 291-294 (February 2013): 3–8. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.3.

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Solar collectors are the key components of solar thermal utilization. The comparative tests of solar flat-plate collector (SFPC) and heat pipe evacuated tube collector (HPETC) were done in this paper. The results show that during the low temperature difference range, the heat collecting efficiency of the flat-plate collector is about 2.3 times higher than the efficiency of the heat pipe evacuated tube collector and the heat loss of the flat-plate collector is about 3.2 times bigger than that of the heat pipe evacuated tube collector. Through the analysis, two measures are proposed to improve the efficiency of flat-plate collector and reduce the heat loss in order to make it more efficient in the solar heat pump system.

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3

Sriram, V., and B. Kanimozhi. "Investigation of the Effect of Different Materials on Uniform Heat Distribution Over a Solar Collector Pipe." Journal of Computational and Theoretical Nanoscience 17, no. 5 (May 1, 2020): 2021–23. http://dx.doi.org/10.1166/jctn.2020.8842.

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Collector pipe used in solar power plant is a device for converting water from ambient temperature to the raised temperature which in turn used to rotate turbine blades. The raise in temperature is not that much when compared to thermal or nuclear power plant, so researches are going on for improving the heat carrying capacity of collector pipes. The productivity in pipe directly depends on the factors such as solar radiation incident on it, temperature distribution over the pipe, surrounding temperature, material of the pipeline used, and thickness of the pipe. When comparing to all of such parameters, the temperature distribution over the pipe is the main parameter which determines the performance of the collector pipe. For a particular type of solar collector pipe, the temperature distribution is function of length with day variation of solar incidence over it. In this work a collector pipe of length 2.2 m and 7 cm diameter is fabricated and tested under standard laboratory conditions for the uniform heat dissemination over the pipe. For keeping up the uniform temperature over the collector pipe, it is necessary to wound the pipe with metals like copper, aluminum. The results show that the heat distribution over the pipe is increased in case of copper when compared with aluminium.

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4

Zhang, Yun Feng, Kai Han, Ben Liang Xu, and Zheng Rong Chang. "Experimental Study on Heat Transfer Performance of the Solar Collector with an Inserted Heat Pipe Using Magnetic Nano-Fluids as the Working Fluid." Applied Mechanics and Materials 209-211 (October 2012): 279–83. http://dx.doi.org/10.4028/www.scientific.net/amm.209-211.279.

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The heat transfer system of glass evacuated solar collector with an inserted heat pipe was established and researched experimentally. Two different kinds of heat collector device with heat pipe using magnetic nano-fluids and water as the working fluid respectively were researched at different aspects of tilt angles, climate conditions and total solar radiations.The exprimental results show that the solar collector with an inserted heat pipe using magnetic nano-fluids as the working medium has the lower heat loss coefficient, the higher average daily efficiency and instantaneous efficiency. The results provide a new idea to improve the heat transfer performance of solar collectors.

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Tang, Qian Yu, Hua Wang, Hui Tao Wang, and Shan Qing. "Serpentine Flat Plate Collector Thermal Performance Testing." Advanced Materials Research 261-263 (May 2011): 648–51. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.648.

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Due to the conventional flat plate solar collector has low efficient, it is necessary to make some improvements in the structure of conventional flat solar collector. This research improved the structure of conventional flat solar collector and conducted thermal performance testing for the improved structure which is serpentine heat pipe flat plate solar collector. The test results indicate that serpentine heat pipe flat plate solar collector has higher efficient than conventional solar collector. Thus, serpentine has better economic and environmental benefit than conventional solar collector.

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Jafarkazemi, Farzad, Emad Ahmadifard, and Hossein Abdi. "Energy and exergy efficiency of heat pipe evacuated tube solar collectors." Thermal Science 20, no. 1 (2016): 327–35. http://dx.doi.org/10.2298/tsci130227150j.

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In this paper, a heat pipe evacuated tube solar collector has been investigated both theoretically and experimentally. A detailed theoretical method for energy and exergy analysis of the collector is provided. The method is also evaluated by experiments. The results showed a good agreement between the experiment and theory. Using the theoretical model, the effect of different parameters on the collector?s energy and exergy efficiency has been investigated. It is concluded that inlet water temperature, inlet water mass flow rate, the transmittance of tubes and absorptance of the absorber surface have a direct effect on the energy and exergy efficiency of the heat pipe evacuated tube solar collector. Increasing water inlet temperature in heat pipe evacuated solar collectors leads to a decrease in heat transfer rate between the heat pipe?s condenser and water.

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Sivakumar, K. "Theoretical and Experimental Investigation of Elliptical Heat Pipe Flat Plate Solar Collector." International Journal of Engineering and Technology 4, no. 1 (2012): 86–92. http://dx.doi.org/10.7763/ijet.2012.v4.324.

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8

Tong, Yijie, and Honghyun Cho. "Comparative Study on the Thermal Performance of Evacuated Solar Collectors with U-Tubes and Heat Pipes." International Journal of Air-Conditioning and Refrigeration 23, no. 03 (September 2015): 1550019. http://dx.doi.org/10.1142/s2010132515500194.

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Evacuated solar collectors with U-tubes (ESCU) and heat pipes (ESCHP) were designed and constructed to allow heat from solar radiation to be collected at a relatively high efficiency. A theoretical investigation of the overall performance of solar collectors under local weather conditions in Korea was carried out for two kinds of solar collectors: those with U-tubes and those with heat pipes. The results of the two models were then compared to those of the collector model to investigate their performance differences, which were affected by radiation, ambient temperature absorber areas, and structures. The comparisons showed high accordance between the simulation and experimental results for both types of solar collectors. The results obtained from the simplified model show that each type of collector had advantages. They had great efficiency disparities when the heat pipe-type had an 8% higher efficiency than the U-tube-type during the sunny day, while the U-tube-type showed steadier and better thermal performance when it was cloudy.

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9

Putra, Nandy, Kristofer Haliansyah, and Wayan Nata Septiadi. "Performance of the Solar Collector with Vacuum Tubes and Dual Heat Pipes Based on Wick Length Variation." Applied Mechanics and Materials 819 (January 2016): 147–51. http://dx.doi.org/10.4028/www.scientific.net/amm.819.147.

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The increasing number of non-renewable energy and the rising need of energy caused some global issue. We always interested to discuss how human being could create and improve an instrument that can extract energy from renewable energy resources, which is clean and applicable. One instrument that can extract energy from the sun is solar water heater. Solar water heater, consist of two main components. The first one is storage tank, and the other is solar collector. The purpose of this research is to design, manufacture, determine the performance of the solar collector with vacuum tubes and dual heat pipe based on the wick length variation. This experiment used a 150 Watt halogen lamp as the simulator of the sun. A copper fin was utilized to collect heat from the sun and transfer the heat to heat pipes. Adiabatic walls made from Styrofoam and plywood were set to prevent heat transfer to the environment due temperature difference. The performance of the heat pipe was investigated based on the wick length inside the heat pipe. The flow characteristic inside of the heat pipe and the thermal resistance depend on the wick length. The study found that the full-length wick heat pipe has the best performance with 0.37 K/W thermal resistance, and the efficiency of the system reach 34.95%. This is the highest value compared to the half-length and three-quarter length wick heat pipe.

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10

Hull, J. R. "Comparison of Heat Transfer in Solar Collectors With Heat-Pipe Versus Flow-Through Absorbers." Journal of Solar Energy Engineering 109, no. 4 (November 1, 1987): 253–58. http://dx.doi.org/10.1115/1.3268215.

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Analysis of heat transfer in solar collectors with heat-pipe absorbers is compared to that for collectors with flow-through absorbers for systems that produce hot water or other heated fluids. In these applications the heat-pipe absorber suffers a heat transfer penalty compared with the flow-through absorber, but in many cases the penalty can be minimized by proper design at the heat-pipe condenser and system manifold. When the solar collector is used to drive an absorption chiller, the heat-pipe absorber has better heat transfer characteristics than the flow-through absorber.

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11

Chang, M. J., and J. A. Roux. "Parabolic Solar Collector With Glass Pipe and Black Fluid." Journal of Solar Energy Engineering 108, no. 2 (May 1, 1986): 129–34. http://dx.doi.org/10.1115/1.3268079.

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A glass pipe and an absorbing black fluid were combined with a parabolic solar reflector into a solar collector. Thermal efficiencies for three different types of receivers with a parabolic trough solar reflector were compared: (1) single glass pipe with black fluid, (2) concentric annulus glass pipes with black fluid, and (3) black-painted copper tubing. The single glass pipe with a black working fluid performed best experimentally. The single glass pipe with a black fluid was better than the black painted copper tube by an average value of 5 percent absolute system efficiency or 14 percent on a total energy absorbed basis. Mass flow rate and wind speed were analytically found to be significant. The black fluid solar collector was found to have an optimum system efficiency for a blackening agent concentration of 15 ml per gallon of water. A numerical lumped heat capacity model was used to compare with the experimental data.

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12

Basheer Sheeba, Jinshah, and Ajith Krishnan Rohini. "Structural and Thermal Analysis of Asphalt Solar Collector Using Finite Element Method." Journal of Energy 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/602087.

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The collection of solar energy using asphalt pavements has got a wide importance in the present energy scenario. Asphalt pavements subjected to solar radiation can reach temperature up to 70°C because of their excellent heat absorbing property. Many working parameters, such as pipe diameter, pipe spacing, pipe depth, pipe arrangement, and flow rate, influence the performance of asphalt solar collector. Existing literature on thermal energy extraction from asphalt pavements is based on the small scale laboratory samples and numerical simulations. In order to design an efficient asphalt solar collector there should be a payoff between the thermal and structural stability of the pavement, so that maximum heat can be absorbed without structural damage due to external load condition. This paper presents a combined thermal and structural analysis of asphalt solar collector using finite element method. Analysis is carried out in different models so as to obtain optimum pipe spacing, pipe diameter, depth, and pipe arrangement under the specified condition.

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13

Idrus, Fairosidi, Nazri Mohamad, Ramlan Zailani, Wisnoe Wirachman, and Mohd Zulkifly Abdullah. "Experimental Model to Optimize the Design of Cylindrical Heat Pipes for Solar Collector Application." Applied Mechanics and Materials 393 (September 2013): 735–40. http://dx.doi.org/10.4028/www.scientific.net/amm.393.735.

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A heat pipe is a heat-transfer device that use the principles of thermal conductivity and phase change to transfer heat between two ends at almost constant temperature. The thermal peformance of cylindrical heat pipes depends on design parameters such as dimensions of the heat pipe, material, wick structure and the working fluid. An experimental strategy was designed to study the effect of these parameters on the thermal performance of cylindrical heat pipes. The experimental design was conceived by employing the Taguchi method. The final aim of the experiments is to come up with design parameters that will yield optimum thermal performance. This paper presents an efficient design of experiment and the associated experimental setup and procedures to be carried out in order to optimize the design of cylindrical heat pipes.

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14

Mukuna, Jean Gad, and Jasson Gryzagoridis. "The effect of different working fluids and internal geometries on the efficiency of evacuated tube heat pipe solar collectors." Journal of Energy in Southern Africa 31, no. 4 (November 21, 2020): 16–25. http://dx.doi.org/10.17159/2413-3051/2020/v31i4a8480.

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In this study, a heat pipe was modified with designed and manufactured inserts of specific profiles in order to investigate the effect of the internal geometries and working fluids on the efficiency of the evacuated tube heat pipe solar collector. The experimental rig was made of a mobile frame, an insulated water tank, a solar simulator and an evacuated tube heat pipe. Using an average irradiance of 700 watts per square meter, the indoor tests were conducted first on a heat pipe without any working fluid (dry mode) and later on the heat pipe containing, in turn, each of the six working fluids for each of the five geometries. Results show that, when inserting different profiles in the heat pipe, there is an enhancement of the heat transfer and hence an increase in the efficiency of the evacuated heat pipe solar collector.

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15

Chen, Wen Bin, and Li Xi Zhang. "Thermal Performance Analyses of Heat Pipe of All-Glass Evacuated Tubular Solar Collectors with Properties of Pipe Materials." Advanced Materials Research 625 (December 2012): 308–11. http://dx.doi.org/10.4028/www.scientific.net/amr.625.308.

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In this paper, the abio-superconductor heat pipe is used as heat transfer tube of all-glass of evacuated tubular solar collectors. Based on thermal analysis, the overall heat loss coefficient , the efficiency factor and the heat removal factor of superconductor heat pipe evacuated tubular collector are presented. They were compared with instantaneous efficiency between theory value of example and measure value of experiment. As a result, their opposite error less than 5.3%, it explained related calculation expression that it reflected preferably transmit heat function and characteristics of vacuum tube solar collector .It discussed how to prove collector performance and used for that type of vacuum tube of the design and the performance forecast. The heat pipe catheter contains a small amount of powder of the working medium, these media consists of a variety of inorganic elements. The properties of pipe materials can be in a very short time to achieve isothermal heat transfer, as its radial heat transfer capacity of 44 kW/m2, axial heat transfer capacity is 8600 kW/m2,heat pipe can transfer more compared with the normal.

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16

Facao, J., and A. C. Oliveira. "Analysis of a plate heat pipe solar collector." International Journal of Low-Carbon Technologies 1, no. 1 (January 1, 2006): 1–9. http://dx.doi.org/10.1093/ijlct/1.1.1.

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17

EL-NASR, M. A., and S. M. EL-HAGGAR. "Performance of a Wickless Heat Pipe Solar Collector." Energy Sources 15, no. 3 (July 1993): 513–22. http://dx.doi.org/10.1080/00908319308909044.

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18

Sivakumar, K. "Performance analysis of elliptical heat pipe solar collector." Indian Journal of Science and Technology 4, no. 1 (January 20, 2011): 4–7. http://dx.doi.org/10.17485/ijst/2011/v4i1.4.

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19

Znaczko, Pawel, Emilian Szczepanski, Kazimierz Kaminski, Norbert Chamier-Gliszczynski, and Jacek Kukulski. "Experimental Diagnosis of the Heat Pipe Solar Collector Malfunction. A Case Study." Energies 14, no. 11 (May 24, 2021): 3050. http://dx.doi.org/10.3390/en14113050.

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Work was carried out to diagnose irregularities in the operation of a vacuum-tube solar collector. Experimental investigations of the collector were carried out at the solar collector field test stand in the Laboratory of Solar Collectors at the Koszalin University of Technology. The scope of the work included the following: research on thermal efficiency characteristics, research on the temperature distribution on the solar collector manifold, and research on the geometric structure of the heat pipe and filling with the working medium. Based on the diagnostic tests carried out, the occurrence of incorrect sedimentation in the condenser on the neck of the heat pipe (44%) and an incorrect amount of working medium (66%) were found. The results show that the functioning of the heat pipe significantly depends on its geometric structure and the amount of working medium. Any irregularity at the production stage contributes to a reduction in the thermal efficiency of the solar collector. The results of the experimental research presented in this paper can be used in the diagnostic analyses of solar systems as well as in the organisation of the manufacturing processes of these systems.

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20

Chilbule, Pawan V., Lalit P. Dhole, and Nishant M. Yewale. "Solar cooking system employing heat pipe solar Collector: A review." Materials Today: Proceedings 56 (2022): 1972–81. http://dx.doi.org/10.1016/j.matpr.2021.11.286.

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Deng, Yuan Chao, Yu Ning Zhong, and Tao He. "System Design of Testing System for Truck-Mounted Solar Collector." Advanced Materials Research 562-564 (August 2012): 578–82. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.578.

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The truck-mounted solar collector testing system is a flexible and convenient testing device. However design of thus a system is much more difficult than that of the fixed solar collector testing system, because it needs consideration in every respect so as to make sure the following: accurate testing, accommodation of the reduced volume of the testing system, stability of the testing system, addition of a removable device and so on. This article explores the systematic design of the truck-mounted solar collector testing system, points out the design issues to be considered, propose an appropriate design plan, and finally conducts the main force calculation. Solar energy is one of the cleanest sources; it is green and pollution-free. Today, environmental pollution is getting worse and worse; thus application of solar energy is becoming more extensive. A solar collector is defined as any of various devices that absorb the solar radiation and deliver the heat energy to the medium of heat transfer device. Solar collectors are not a direct consumer-oriented product, but key components that form various solar thermal systems, such as solar water heaters, solar energy dryers, solar industrial heaters and so on, of which the solar collectors are a core part of the system. At present solar heat pipe collectors and collector plates are the two most widely used products of solar collectors. Factory productions of such products are subject to inspection before they can be put on the market. Currently product testing of this kind is performed collectively in fixed locations; consequently, it is vulnerable to the geographical conditions, climate changes, and other factors in the location. A truck-mounted solar collector testing system is a system that integrates both testing systems, heat pipe collectors and collector plates, in a vehicle, which can be driven into the manufacturers that produce heat pipes and/or heat plates or other places where testing conditions can be met according to the requirements. By doing so, the problems associated with the fixed testing system can be solved. However, design of truck-mounted type solar collector testing system is much more difficult than that of fixed solar collector testing system. In addition to testing accuracy, it must also take the reduced volume of the testing system into account to ensure that the system can be accommodated into a smaller space of the vehicle. Furthermore, the stability of the testing system must be assured. Finally a removable device needs to be added to the system for convenience. In the following, we show our design of the truck-mounted solar collector testing system and calculations for the related stress analysis.

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22

Ng, K. C., C. Yap, and T. H. Khor. "Outdoor testing of evacuated-tube heat-pipe solar collectors." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 214, no. 1 (February 1, 2000): 23–30. http://dx.doi.org/10.1243/0954408001530182.

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The paper presents the steady state performance of two types of commercially available evacuated-tube heat-pipe solar collector that were tested under the meteorological conditions of Singapore. The tests were made in arrays of collectors in contrast with the normal tests performed under controlled laboratory conditions. A theoretical model is also presented to predict the collector efficiency as well as the collectable energy during a steady state test. Within the range of expected coolant temperatures, the efficiency and the heat loss coefficient of collectors are measured and a linear expression can adequately depict their characteristics.

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23

VASHCHYSHAK, IRYNA, and VITALII TSYKH. "IMPROVEMENT OF THE COMBINED SYSTEM OF ELECTRICITY GENERATION." Herald of Khmelnytskyi National University. Technical sciences 307, no. 2 (May 2, 2022): 146–52. http://dx.doi.org/10.31891/2307-5732-2022-307-2-146-152.

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An urgent problem today is the need for uninterrupted and reliable energy supply of buildings and structures using alternative energy. Theoretical research was conducted in order to create a new technology of electricity generation by combining the capabilities of renewable energy sources, namely solar and hydropower. To confirm the possibility of creating a new technology of electricity generation, scientific studies of the properties of heat pipes were conducted. The possibilities of generating electricity from the energy of heated steam, which arises in the process of evaporation and movement of the coolant inside the heat pipe, are estimated. The source of energy for the evaporation process is hot water from the solar collector, which is forcibly supplied to the evaporation zone by a pump. The source of electricity for the operation of the pump and auxiliary equipment and means for cooling the evaporation zone of the heat pipe are solar panels, placed in such a way as to create a constant shadow on the surface of the heat pipe. The use of hot water from the solar collector as a heat source for the operation of such a heat pipe has made it possible to create a new technology for generating electricity with high productivity. Based on the theoretical research, the structure of the combined system of electricity generation is proposed, in which the impeller of the turbine is placed inside the heat pipe, and its heating is carried out by solar collectors, which increased the efficiency of renewable energy sources. The functional scheme of the combined system of generation of the electric power is developed and the principle of its work is resulted. The main theoretical dependences are selected and the parameters of the elements of such a combined generation system are calculated.

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24

Li, Jie. "Review of Materials for Solar Thermal Collectors." Advanced Materials Research 171-172 (December 2010): 486–89. http://dx.doi.org/10.4028/www.scientific.net/amr.171-172.486.

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To cover the main contributions and developments in solar thermal collectors through focusing on materials, heat transfer characteristics and manufacturing challenges. A range of published papers and internet research including research work on various solar thermal collectors (flat plate, evacuated tubes, and heat pipe tube) were used. Evaluation of solar collectors performance is critiqued to aid solar technologies make the transition into a specific dominant solar collector. The sources are sorted into sections: finding an academic job, general advice, teaching, research and publishing, tenure and organizations. Provides information about types of solar thermal collectors, indicating what can be added by using evacuated tube collectors instead of flat plate collectors and what can be added by using heat pipe collectors instead of evacuated tubes. Focusing only on three types of solar thermal collectors (flat plate, evacuated tubes, and heat pipe tube). Useful source of information for consultancy and impartial advice for graduate students planning to do research in solar thermal technologies. This paper fulfils identified information about materials and heat transfer properties of materials and manufacturing challenges of these three solar thermal collectors.

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25

Jantana, Kwanchai, Withaya Puangsombut, and Thana Ananacha. "The Performance of the Interlocking Block Solar Collector." Applied Mechanics and Materials 619 (August 2014): 130–34. http://dx.doi.org/10.4028/www.scientific.net/amm.619.130.

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This paper investigates the thermal performance of the interlocking block solar collector. It consists of the interlocking block wall with horizontal cylindrical hollow and embedded the steel pipes connected in series, the steel pipe outer diameter are 25.4 mm; serves as a collector. The collector having a height of 2.2 m, 1.5 m wide, and thickness of 0.1 m. The results were presented the maximum temperature difference between inlet and outlet air temperatures by about 6°C. The room temperature of interlocking block solar collector is lower than the common interlocking block throughout the day. The efficiency of interlocking block solar collector during the experimental period was about 20%, that is a significantly to reduce heat gain into space room.

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Uzbekov, Mirsoli O. "Issues of Development of Solar Collectors with High Efficiency." Journal of Siberian Federal University. Engineering & Technologies 14, no. 8 (December 2021): 942–49. http://dx.doi.org/10.17516/1999-494x-0364.

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The article deals with the creation of energy-efficient solar water collectors. In order to develop energy-efficient solar water collectors (SWC), methods of rational enhancement of heat transfer in the channels of the collectors are proposed. It is noted that the methods used to increase heat transfer from the collector walls to the water should be tailored to a low-speed flow of the heat carrier. With such flow regimes, the most acceptable ways to enhance heat transfer are: flow swirling, the use of artificial roughness, renewal of the hydrodynamic boundary layer through the creation of an alternating pressure gradient in the flow. The analysis of the conducted research shows that the maximum effects of increasing heat transfer occur in the range of Re numbers from 2000 to 8000, i. e. in the laminar flow region and in the region of underdeveloped turbulence. An efficiency criterion is obtained for the conditions under which enhancers are installed inside the pipes. The criterion determines the ratio of the number of pipes with enhancers to the number of smooth pipes. The calculation is carried out for cases in which the heating capacity, flow rate, power for heat carrier circulation and the pipe diameter of the SWC with smooth pipes are equal to the heating capacity, flow rate, power for heat carrier circulation and pipe diameter of the SWC with the pipes with enhancers. In addition to the specified efficiency criterion of the SWC, a heat transfer comparison formula of the SWC having pipes with enhancers and SWC with smooth pipes is obtained

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Zheng, Hui-Fan, Yin-Long Chen, Xiao-Wei Fan, and Guo-Ji Tian. "A heat pipe solar collector system for winter heating in Zhengzhou city, China." Thermal Science 21, no. 4 (2017): 1771–76. http://dx.doi.org/10.2298/tsci151229067z.

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A heat pipe solar collector system for winter heating is investigated both experimentally and theoretically. The hourly heat collecting capacity, water temperature and contribution rate of solar collector system based on Zhengzhou city typical sunshine are calculated. The study reveals that the heat collecting capacity and water temperature increases initially and then decreases, and the solar collector system can provide from 40% to 78% heating load for a 200 m2 villa with in Zhengzhou city from November to March.

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Gao, Yuhang, Chao Gao, Haizhen Xian, and Xiaoze Du. "Thermal Properties of Solar Collector Comprising Oscillating Heat Pipe in a Flat-Plate Structure and Water Heating System in Low-Temperature Conditions." Energies 11, no. 10 (September 25, 2018): 2553. http://dx.doi.org/10.3390/en11102553.

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Solar collectors are very important to the photothermal utilization of solar energy in low-temperature conditions. In this paper, a solar collector comprising an oscillating heat pipe in a flat-plate structure is designed and studied experimentally. The thermal properties are studied in detail, and we finally obtain the startup temperature and the expression of the instantaneous efficiency with a relative error of 5%. The results show that the impact of inclination angles on the startup properties of the solar collector is significant to the thermal properties. The comparisons of the efficiency of the present design and similar products are also displayed and discussed, showing that an oscillating heat pipe collector in a flat-plate structure overcomes the low efficiency, high startup temperature and bad pressure resistance of conventional solar collectors. In addition, the thermal properties of the water heating system based on the novel collector were also tested, illustrating the differences between the solar irradiance and the water heating system. Some improvements (e.g., shell material and assembly method) were made in this system design process to increase the heat transfer efficiency and solve the corrosion and pressure resistance problems.

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Kumar, S. Siva, K. Mohan Kumar, and S. R. Sanjeev Kumar. "Design of Evacuated Tube Solar Collector with Heat Pipe." Materials Today: Proceedings 4, no. 14 (2017): 12641–46. http://dx.doi.org/10.1016/j.matpr.2017.10.075.

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30

Du, Bin, Eric Hu, and Mohan Kolhe. "An experimental platform for heat pipe solar collector testing." Renewable and Sustainable Energy Reviews 17 (January 2013): 119–25. http://dx.doi.org/10.1016/j.rser.2012.09.009.

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Azad, E. "Theoretical and experimental investigation of heat pipe solar collector." Experimental Thermal and Fluid Science 32, no. 8 (September 2008): 1666–72. http://dx.doi.org/10.1016/j.expthermflusci.2008.05.011.

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32

Chen, Yang, Yongqing He, and Xiaoqin Zhu. "Flower‐type pulsating heat pipe for a solar collector." International Journal of Energy Research 44, no. 9 (April 29, 2020): 7734–45. http://dx.doi.org/10.1002/er.5505.

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Merzah, Basil Noori, Majid H. Majeed, and Fouad A. Saleh. "Numerical study of flat plate solar collector performance with square shape wicked evaporator." Al-Qadisiyah Journal for Engineering Sciences 12, no. 2 (June 30, 2019): 90–97. http://dx.doi.org/10.30772/qjes.v12i2.592.

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In this work, a system of a heat pipe is implemented to improve the performance of flat plate solar collector. The model is represented by square shape portion of the evaporator section of wicked heat pipe with a constant total length of 510 mm, and the evaporator section inclined by an angle of 30o. In this models the evaporator, adiabatic and condenser lengths are 140mm, 140mm, and 230mm respectively. The omitted energies from sunlight simulator are 200, 400, 600, 800 and 1000 W/m2 which is close to the normal solar energy in Iraq. The working fluid for all models is water with fill charge ratio of 240%. The efficiency of the solar collector is investigated with three values of condenser inlet water temperatures, namely (12, 16 and 20o C). The numerical result showed an optimum volume flow rate of cooling water in condenser at which the efficiency of collector is a maximum. This optimum agree well with the ASHRAE standard volume of flow rate for conventional tasting for flat plate solar collector. When the radiation incident increases the thermal resistance of wicked heat pipe is decreases, where the heat transfer from the evaporator to condenser increases. The numerical results showed the performance of solar collector with square shape evaporator greater than other types of evaporator as a ratio 15 %.

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Furbo, Simon, Niels Kristian Vejen, and Louise Jivan Shah. "Thermal Performance of a Large Low Flow Solar Heating System With a Highly Thermally Stratified Tank." Journal of Solar Energy Engineering 127, no. 1 (February 1, 2005): 15–20. http://dx.doi.org/10.1115/1.1767190.

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In year 2000 a 336 m2 solar domestic hot water system was built in Sundparken, Elsinore, Denmark. The solar heating system is a low flow system with a 10000 l hot-water tank. Due to the orientation of the buildings half of the solar collectors are facing east, half of the solar collectors are facing west. The collector tilt is 15° from horizontal for all collectors. Both the east-facing and the west-facing collectors have their own solar collector loop, circulation pump, external heat exchanger and control system. The external heat exchangers are used to transfer the heat from the solar collector fluid to the domestic water. The domestic water is pumped from the bottom of the hot-water tank to the heat exchanger and back to the hot-water tank through stratification inlet pipes. The return flow from the DHW circulation pipe also enters the tank through stratification inlet pipes. The tank design ensures an excellent thermal stratification in the tank. The solar heating system was installed in May 2000. The thermal performance of the solar heating system has been measured in the first two years of operation. Compared to other large Danish solar domestic hot water systems the system is performing well in spite of the fact that the solar collectors are far from being orientated optimally. The utilization of the solar radiation on the collectors is higher, 46% in the second year of operation, than for any other system earlier investigated in Denmark, 16%–34%. The reason for the good thermal performance and for the excellent utilization of the solar radiation is the high hot-water consumption and the good system design making use of external heat exchangers and stratification inlet pipes.

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Wang, Kaipeng, Qimin Li, Ke Cheng, and Jian Wang. "Experimental investigation on efficient heat collection of aboveground pipes." Thermal Science 24, no. 2 Part B (2020): 1445–60. http://dx.doi.org/10.2298/tsci190727423w.

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Prospects for low-cost utilization and storage of solar energy are promising. In this study, the change of shallow geo-temperature was monitored, and the influence of solar radiation on shallow geo-temperature was discussed. Three series of field experiments on heat transfer of aboveground pipes were designed, and the variations of water temperature in the aboveground pipes were also monitored. According to the experimental data, the relevant factors affecting the water temperature inside the pipe (such as solar radiant intensity, pipe?s material, pipe?s spatial location, heat-accumulating wall and so on) were analyzed. Based on the field test, a 3-D model of aboveground pipe heat transfer was established to verify and temperature prediction was carried out. The results show that the water temperature in the pipe is most significantly affected by solar radiation, and is also related to the color of the pipe and its spatial position. The water temperature of galvanized steel pipe wrapped with black plastic film is the highest under solar radiation, and the op?timum distance between the pipe and the heat-accumulating wall and the Earth?s surface is, respectively, 0.90~1.25 times of the outer diameter of the pipe. The way the pipe is covered has a great influence on the water temperature inside the pipe. When the black and polyethylene pipe covered with the white plastic film is in the best spatial position, the highest heat of the three series of tests is obtained, and the difference between the water temperature inside the pipe and the atmospheric temperature reaches 36.3?C.

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Khamraev, S. I., U. Kh Ibragimov, and B. I. Kamolov. "Removal of hydrodynamic lesions of a heated floor with a solar collector." IOP Conference Series: Earth and Environmental Science 1070, no. 1 (July 1, 2022): 012018. http://dx.doi.org/10.1088/1755-1315/1070/1/012018.

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Abstract This paper presents the results of an experimental study of the hydrodynamic process of a solar collector water-heated floor system. The water-heated floor system is designed to heat living rooms. Based on the analysis of the structures of the hot water floor, methods of their installation and the methodology of hydrodynamic calculation of the hot floor, experimental studies were conducted on the total pressure loss in the pipes of the hot water floor and the pump power used to transfer hot water from the pipes. Experimental studies were carried out in laminar and turbulent flow regimes at different diameters and different positioning steps of the water-heated floor pipe. The results of the hydrodynamic process study showed that the pressure drop and pump power were the highest at the pipe diameter and pipe pitch of 12 mm and 100 mm, i.e. 8 kPa and 18.5 W in the laminar mode and 14 kPa and 210 W in the turbulent mode. . Results obtained as the pressure loss and the power consumption of the pump decrease with increasing pipe diameter and positioning pitch ΔP = f(Re) and N = f(Re) presented in the form of a dependency graph.

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Ünvar, Sinan, Tayfun Menlik, Adnan Sözen, and Hafız Muhammad Ali. "Improvement of Heat Pipe Solar Collector Thermal Efficiency Using Al2O3/Water and TiO2/Water Nanofluids." International Journal of Photoenergy 2021 (June 7, 2021): 1–13. http://dx.doi.org/10.1155/2021/5546508.

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Heat pipe solar collectors (HPSCs) are heat exchangers that carry heat based on the phase change of the heat pipe working fluid. It is aimed to increase the operating temperature range of solar collectors by changing the phase of the working fluid in the heat pipe at low temperature. For this reason, it has become widespread to use nanofluids obtained by mixing nanosized metal oxides with the base fluid in certain proportions in order to increase both the thermal conductivity of the heat pipe working fluids and to increase the specific heat closures. The main purpose of this study, which was conducted to evaluate the performance of HPSCs, is to increase performance, and an experimental study has been conducted in this direction. For this purpose, an HPSC designed and manufactured was used. Al2O3-water and TiO2-water nanofluids containing 2% nanoparticles were used in order to increase performance in the study. HPSC used in the study consists of 8 heat pipes with a length of 100 cm. The experiments were carried out for pure water and nanofluids, and their efficiency and strength were compared. The highest value of instantaneous efficiency was calculated as 48% when pure water was used as the working fluid, 58% for Al2O3-water nanofluid, and 64% for TiO2-water nanofluid. The instantaneous power obtained using pure water was determined as 135.66 W, 167.96 W for Al2O3-water nanofluid, and 184.03 W for TiO2-water nanofluid. The improvement in efficiency was determined as 20.8% for Al2O3-water nanofluid and 33.3% for TiO2-water nanofluid. Improvement in powers was found to be 23.8% for Al2O3-water nanofluid and 35.6% for TiO2-water nanofluid.

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Dwivedi, Shubham, Ayush Singh Baghel, and P. Sudhakar. "Experimental investigation of hot water assisted solar air collector." Journal of Physics: Conference Series 2054, no. 1 (October 1, 2021): 012048. http://dx.doi.org/10.1088/1742-6596/2054/1/012048.

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Abstract A solar flat plate collector is a device that converts the solar radiation energy from the sun into heat energy. A solar flat plate collector was designed and fabricated. The solar air collector has an absorbing plate of 1m × 0.06m area made up of galvanized iron. Outer frame of collector is fabricated with plywood. It is painted black using metal paint in order to increase its heat absorbing capacity. In order to increase the heating efficiency of the collector a serpentine coil of copper pipe is welded to the bottom of the absorber plate through which hot water is passed. Efficiency of solar flat plate collector was increased by 15.58% using this method.

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Tunik, Alexander, and Mikhail Tolstoy. "Hydraulic optimization of the flat solar collectors SUN 1 and the temperature gradient of the heat carrier in a system of connected solar units." MATEC Web of Conferences 212 (2018): 02007. http://dx.doi.org/10.1051/matecconf/201821202007.

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The article presents an analytical method for selecting the optimal technical performance of the heat exchanger for a flat solar collector, using meander-shaped heat-sensing tubes, which allow obtaining a higher value of the coolant temperature at the exit from the flat solar collector. Also, the article presents a technique for determining the temperature of the coolant at the exit from a flat solar collector and the possibility of its application in the design of solar heating systems. This technique will allow to determine the optimum and the maximum possible number of successively connected flat liquid helium collectors and, accordingly, to obtain effective design and technical solutions. The technique is based on the use of the empirical dependence of the coolant’s temperature in the outlet branch pipe of a flat solar collector on the length of its heat-sensing tubes. The technique has been successfully applied in the study of heat-mass transfer processes in a new model of a flat solar collector being developed at the Department of Engineering Communications and Life Support Systems of the Irkutsk National Research Technical University. A comparative analysis of the measured values of the coolant temperature in the outlet branch pipe of the investigated reservoir with the values calculated using the empirical dependence presented in the article actually confirmed the adequacy of the presented technique with reference to one solar collector. The article shows results of calculating a system of consecutively connected collectors, which was conducted using the aforementioned technology.

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Supankanok, Rasa, Sukanpirom Sriwong, Phisan Ponpo, Wei Wu, Walairat Chandra-ambhorn, and Amata Anantpinijwatna. "Modification of a Solar Thermal Collector to Promote Heat Transfer inside an Evacuated Tube Solar Thermal Absorber." Applied Sciences 11, no. 9 (April 30, 2021): 4100. http://dx.doi.org/10.3390/app11094100.

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Evacuated-tube solar collector (ETSC) is developed to achieve high heating medium temperature. Heat transfer fluid contained inside a copper heat pipe directly affects the heating medium temperature. A 10 mol% of ethylene-glycol in water is the heat transfer fluid in this system. The purpose of this study is to modify inner structure of the evacuated tube for promoting heat transfer through aluminum fin to the copper heat pipe by inserting stainless-steel scrubbers in the evacuated tube to increase heat conduction surface area. The experiment is set up to measure the temperature of heat transfer fluid at a heat pipe tip which is a heat exchange area between heat transfer fluid and heating medium. The vapor/ liquid equilibrium (VLE) theory is applied to investigate phase change behavior of the heat transfer fluid. Mathematical model validated with 6 experimental results is set up to investigate the performance of ETSC system and evaluate the feasibility of applying the modified ETSC in small-scale industries. The results indicate that the average temperature of heat transfer fluid in a modified tube increased to 160.32 °C which is higher than a standard tube by approximately 22 °C leading to the increase in its efficiency by 34.96%.

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Ambarita, Himsar, Firman Siahaan, Herdy -, and H. V. Sihombing. "PERFORMANSI PEMANAS AIR TENAGA SURYA DENGAN PENAMBAHAN SIRIP PADA PIPA KOLEKTOR." SPROCKET JOURNAL OF MECHANICAL ENGINEERING 1, no. 2 (March 14, 2020): 57–64. http://dx.doi.org/10.36655/sprocket.v1i2.180.

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The solar energy that reaches the earth's surface can be converted into heat energy using solar collectors. Inside the collector, there are several components including a heating pipe as a medium to drain water to the storage tank. There are several factors that increase the performance of solar collectors including the addition of fins to the pipe which will increase the collector's cross-sectional area. This study compares solar collectors with and without the addition of fins, the aim of improving the performance of solar water heater collectors with the addition of fins. Where the dimensions of the fins used are 50 x 12 x 0.3 mm. testing is done by comparing the two collectors. The results showed an increase in temperature in solar water heaters with the addition of fins to the pipe and an increase in efficiency of 18.67% compared to solar water heaters without the addition of fins.

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Elsayied Ali, Khalid Taha, Dr Osama Mohammed Elmardi Suleiman Khayal, and Dr Elhassan Bashier Elagab. "DESIGN OF AN ABSORBER PIPE FOR SOLAR TROUGH COLLECTOR." International Journal of Engineering Applied Sciences and Technology 7, no. 6 (October 1, 2022): 128–32. http://dx.doi.org/10.33564/ijeast.2022.v07i06.008.

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this paper presents a review of the design parameters, mathematical techniques and simulations used in the design of trough solar systems, along with a review on their applications. It deals with the design of an absorber pipe for a solar power plant system with trough collector. The pipe is designed for 1 KW power-generating unit accounting for collector performance and ambient parameters in north Sudan. It was found that the ambient temperature and wind speed have small effects on the output useful heat required in the present design.

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Hossain, Shouquat, Ali Wadi Abbas, Jeyraj Selvaraj, Ferdous Ahmed, and Nasrudin Bin Abd Rahim. "Experiment of a Flat Plate Solar Water Heater Collector with Modified Design and Thermal Performance Analysis." Applied Mechanics and Materials 624 (August 2014): 332–38. http://dx.doi.org/10.4028/www.scientific.net/amm.624.332.

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An investigation is reported of the thermal performance of a flat plate solar water heater with a circulating absorber pipe surface. The thermal performance of the 2-side parallel serpentine flow solar water heater depends significantly on the heat transfer rate between the absorber surface and the water, and on the amount of solar radiation incident on the absorber surface. The modified pipe arrangement has a higher characteristic length for convective heat transfer from the absorber to the water, in addition to having more surface area exposed to solar radiation. It means during the operation of water heater, more solar energy is converted into useful heat. However, this modification has reduced the efficiency of the system marginally.

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Mohd. Amirul Hilmi Mohd Hanoin, Nor Amirah Safiah Muhamad, Nadzirah Mohd Mokhtar, Amir Abdul Razak, and Muhamad Sukri Hadi. "Effect Of Design Parameters of Serpentine-Shaped Flat Plate Solar Collector Under Malaysia Climate Conditions." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 88, no. 1 (October 11, 2021): 71–80. http://dx.doi.org/10.37934/arfmts.88.1.7180.

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Solar thermal energy plays a vital role in the industrial sector, especially for water heating applications. Further research to improve the efficiency of flat plate solar collectors by focusing on collector design modification is imperative. This research aimed to carry out an experimental investigation on comparative designs and fabrication approaches that deal with the analysis of flat plate solar collector thermal performance, thermal efficiency, the effect of various mass flow rates, and pressure drop analyses. In this paper, a different design modification of pipe collector with serpentine-shaped was established with different tube diameters (3/4-inch and 3/8-inch), and different pipe spacing (18.5 cm and 27.0 cm). Under the same heat radiation intensity and constant mass flow rate, a pipe collector with a tube diameter of 3/4-inch achieved 3.5% and 9.4% higher thermal performance and collector efficiency respectively compared to the tube diameter of 3/8-inch. Furthermore, the pipe collector with pipe spacing of 18.5 cm exhibited 4.3% and 12.6% higher thermal performance and collector efficiency respectively compared to pipe spacing of 27 cm. The relationship between collector efficiency and temperature difference was also investigated. Moreover, the effect of different mass flow rates was studied upon and it was found that a flow rate of 0.03 kg/s exhibited optimum thermal performance for the pipe collector. Additionally, a pressure drop was observed with the increase in flow rate, while decreases when the fluid temperature increases.

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Maraj, Altin. "Energy and Economic Estimation for a Passive Solar Water Heating System Equipped with a Heat Pipe Evacuated Tube Collector:." European Journal of Engineering Research and Science 5, no. 3 (March 23, 2020): 348–52. http://dx.doi.org/10.24018/ejers.2020.5.3.1828.

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The energy and the economic estimation for a passive solar water heating system under the Tirana climate conditions is performed. The trial system includes a heat pipe evacuated tube collector. To fulfil these objectives, measured values recorded every minute from the data logger of the system are used. The studied solar collector has a slope of 45° and is oriented 10° East from the South direction. The heat pipe evacuated tube collector has an aperture area of 1.476 m2. For an annual time period the irradiation on tilted solar collector area, the extracted energy from the storage tank, the delivered energy to the thermal consumer and the system efficiency were defined. Also, the economic assessment of the system is performed.

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Maraj, Altin. "Energy and Economic Estimation for a Passive Solar Water Heating System Equipped with a Heat Pipe Evacuated Tube Collector:." European Journal of Engineering and Technology Research 5, no. 3 (March 23, 2020): 348–52. http://dx.doi.org/10.24018/ejeng.2020.5.3.1828.

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The energy and the economic estimation for a passive solar water heating system under the Tirana climate conditions is performed. The trial system includes a heat pipe evacuated tube collector. To fulfil these objectives, measured values recorded every minute from the data logger of the system are used. The studied solar collector has a slope of 45° and is oriented 10° East from the South direction. The heat pipe evacuated tube collector has an aperture area of 1.476 m2. For an annual time period the irradiation on tilted solar collector area, the extracted energy from the storage tank, the delivered energy to the thermal consumer and the system efficiency were defined. Also, the economic assessment of the system is performed.

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Alshukri, Mohammed, Adel Eidan, and Saleh Najim. "An Experimental Study on Micro-Enhanced TESM Incorporated Inside Evacuated Tube Solar Collector Equipped with Heat Pipe." Basrah journal for engineering science 21, no. 3 (October 5, 2021): 1–9. http://dx.doi.org/10.33971/bjes.21.3.1.

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The incorporation of thermal energy storage materials (TESMs) into solar energy systems is a factor that boosts the performance of these systems. In this paper, an experimental study was addressed for enhancing the heat pipe’s thermal performance that works with an Evacuated Solar Tube Collector with Heat Pipe (ETCHP) as a solar water heater system. This is done by adding micro-zinc oxide (ZnO-MP) to the paraffin wax integrated as TESM into the evacuated tube (ET) of the system, where the evaporator section of the heat pipe is completely submerged within the micro-enhanced paraffin wax. Three experimental prototype rigs with one evacuated tube were designed, built, and tested to do the investigation. The most important parameters that have been studied in this study are the thermal resistance and the temperature distribution pattern along the heat pipe. The results show a clear indication of the decrease in the thermal resistance of the heat pipe of the proposed system compared to the system in which pure paraffin wax was incorporated. Also, it was noticed that there is a significant improvement in the temperature distribution along the heat pipe due to the improvement in the conductivity of the micro-enhanced wax compared to the pure wax.

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Putra, Andika, Arwizet K, Yolli Fernanda, and Delima Yanti Sari. "Performance Analysis of Water Heating System by Using Double Glazed Flat Plate Solar Water Heater." Teknomekanik 4, no. 1 (May 24, 2021): 1–7. http://dx.doi.org/10.24036/teknomekanik.v4i1.7872.

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Nowadays, the use of solar energy is incredibly important to be increased since solar energy is renewable energy and also does not cause pollution. To harness solar energy, a solar collector device is needed to convert solar energy into heat energy. This study aimed to analyze the heat transfer in the flat plate solar collector which is used as a source of thermal energy in the water heating process for bathing. A double-glazed solar collector was used to absorb solar thermal energy and then transferred it to a water pipe. The pipe material used copper which has a very high conductivity value with an outer diameter of 15.7 mm. The plate collector used aluminium plates because they have high thermal conductivity. The dimensions of the collector frame were 150 cm long, 80 cm wide and 80 cm high. The collector frame was made of wood and covered with an insulator from coconut fibre with a thickness of 8 cm, with a tilt angle of 15˚. Based on the experimental process, the collector temperature was taken by using a thermocouple in order to heat the water which the inlet temperature in a bucket was 28˚C and the outlet water temperature during the experiment was 40˚C.

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Tabassum, S. A., B. Norton, and S. D. Probert. "Heat removal from a solar-energy collector with a heat-pipe absorber." Solar & Wind Technology 5, no. 2 (January 1988): 141–45. http://dx.doi.org/10.1016/0741-983x(88)90073-2.

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Brahim, Taoufik, and Abdelmajid Jemni. "Parametric study of photovoltaic/thermal wickless heat pipe solar collector." Energy Conversion and Management 239 (July 2021): 114236. http://dx.doi.org/10.1016/j.enconman.2021.114236.

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Journal articles on the topic 'Heat pipe solar collector'

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