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Journal articles on the topic 'Heat exchangers – Design and construction – Testing'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Rix, D. H. "The Design and Initial Testing of a Prototype Stirling Cycle Heat Pump." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 202, no. 6 (November 1988): 431–38. http://dx.doi.org/10.1243/pime_proc_1988_202_145_02.

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This paper covers the first step of an investigation into the potential of the Stirling cycle heat pump. The design and construction of a prototype is described. Particular reference is made to the use of a previously developed theoretical model in the design optimization of the heat exchangers and regenerator. The resultant machine has been tested over a wide range of heat delivery temperatures and temperature lifts, using a pair of hot oil circuits to exchange heat with. Though these initial tests have revealed two design flaws, which have seriously reduced the values attained for the coefficient of performance, they have demonstrated the ability of the Stirling cycle heat pump to deliver heat at higher temperatures and over larger temperature lifts than established types of heat pump.

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2

Podany, Pavel, Martina Koukolikova, and Eva Chvostova. "Aging behaviour of particular stainless-steels and NiFeCr alloy suitable for heat exchangers." MATEC Web of Conferences 249 (2018): 01007. http://dx.doi.org/10.1051/matecconf/201824901007.

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This paper deals with the testing of three materials for special heat exchanger for short-time application. Mechanical and microstructural properties after aging at 650 and 850 °C were tested and analysed. The results will serve as an input data for the design and construction of plate heat exchanger.

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3

Wipplinger, KPM, TM Harms, and AB Taylor. "Stainless steel finned tube heat exchanger design for waste heat recovery." Journal of Energy in Southern Africa 17, no. 2 (May 1, 2006): 47–56. http://dx.doi.org/10.17159/2413-3051/2006/v17i2a3281.

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Around the world the implementation of heat recovery systems play an increasingly important role in the engineering industry. Recovered energy is utilised in production plants (especially in the food industry) and saves companies millions in expenses per year. Waste heat recovery associated with hydrocarbon combustion in the transport industry is identified as a significantly under-utilised energy resource. The aim of this project was to investigate the recovery of waste heat in a small scale system for the purpose of electrical conversion in order to serve as a secondary energy source. A theoretical analysis concerning the design and construction of the system, utilising researched theory and a control-volume-based simulation program of the recovery system, is presented. It was found that heat exchangers for the required duty are not readily available in South Africa. A high pressure, cross flow, stainless steel finned tube heat exchanger with a water side pressure rating of 2 MPa was therefore designed and constructed. By using the exhaust gases of a continuous combustion unit as an energy source and water as the working fluid, efficiencies of up to 74% in direct steam generation testing were obtained.

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4

Alm, B., R. Knitter, and J. Haußelt. "Development of a Ceramic Micro Heat Exchanger - Design, Construction, and Testing." Chemical Engineering & Technology 28, no. 12 (December 2005): 1554–60. http://dx.doi.org/10.1002/ceat.200500253.

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5

Lukitobudi, A. R., A. Akbarzadeh, P. W. Johnson, and P. Hendy. "Design, construction and testing of a thermosyphon heat exchanger for medium temperature heat recovery in bakeries." Heat Recovery Systems and CHP 15, no. 5 (July 1995): 481–91. http://dx.doi.org/10.1016/0890-4332(95)90057-8.

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6

Kincheloe, Mason C., John P. Franke, Christian K. Bach, and Craig R. Bradshaw. "Design of a psychrometric coil testing facility for commercial size heat exchanger coils." International Journal of Refrigeration 121 (January 2021): 143–51. http://dx.doi.org/10.1016/j.ijrefrig.2020.10.027.

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7

Xie, Xiao Hong, Yong Li, Yu Lai, and Yang Cao. "Testing Technology Research on Actual Effect by Construction Piled Pipes in Buried Pipe System of Ground Source Heat Pump." Advanced Materials Research 430-432 (January 2012): 1957–62. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1957.

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The technology of Ground-Source Heat Pump (GSHP) is hot in building energy efficiency and HVAC field, and is largely used in engineering practices. We studied the construction of buried-pipe system of GSHP. In this article, purposes the experiment of thermal response by constructing piled pipes are analyzed in the buried-pipe system of GSHP and principles of testing system for buried pipes of GSHP are introduced, also the soil heat response experiments to achieve pre-assessment techniques of design. Through the above testing means, we believe that whether the buried-pipe system of GSHP finally tested meets the designed heat exchange requirement is determined, which is especially significant to estimate and verify whether the whole GSHP system meets requirements of heat capacity.

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8

Sapińska-Śliwa, Aneta, Tomasz Sliwa, Kazimierz Twardowski, Krzysztof Szymski, Andrzej Gonet, and Paweł Żuk. "Method of Averaging the Effective Thermal Conductivity Based on Thermal Response Tests of Borehole Heat Exchangers." Energies 13, no. 14 (July 20, 2020): 3737. http://dx.doi.org/10.3390/en13143737.

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This work concerns borehole heat exchangers and their testing using apparatus for thermal response tests. In the theoretical part of the article, an equation was derived from the known equation of heat flow, on which the interpretation of the thermal response test was based. The practical part presents the results of several measurements taken in the AGH Laboratory of Geoenergetics. They were aimed at examining the potential heat exchange capacity between the heat carrier and rock mass. Measurement results in the form of graphs are shown in relation to the examined, briefly described wells. Result analysis made it possible to draw conclusions regarding the interpretation of the thermal response test. The method of averaging the measurement results was subjected to further study. The measuring apparatus recorded data at a frequency of one second, however such accuracy was too large to be analyzed efficiently. Therefore, an average of every 1 min, every 10 min, and every 60 min was proposed. The conclusions stemming from the differences in the values of effective thermal conductivity in the borehole heat exchanger, resulting from different data averaging, were described. In the case of three borehole heat exchangers, ground properties were identical. The effective thermal conductivity λeff was shown to depend on various borehole heat exchanger (BHE) designs, heat carrier flow geometry, and grout parameters. It is important to consider the position of the pipes relative to each other. As shown in the charts, the best (the highest) effective thermal conductivity λeff occurred in BHE-1 with a coaxial construction. At the same time, this value was closest to the theoretical value of thermal conductivity of rocks λ, determined on the basis of literature. The standard deviation and the coefficient of variation confirmed that the effective thermal conductivity λeff, calculated for different time intervals, showed little variation in value. The values of effective thermal conductivity λeff for each time interval for the same borehole exchanger were similar in value. The lowest values of effective thermal conductivity λeff most often appeared for analysis with averaging every 60 min, and the highest—for analysis with averaging every 1 min. For safety reasons, when designing (number of BHEs), safer values should be taken for analysis, i.e., lower, averaging every 60 min.

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9

Han, Ruixiong, Zhengping Zou, Rui Ge, Zhengze Chang, Jianqin Zhang, Miaofu Xu, Rui Ye, et al. "Design optimization, construction and testing of 2 K Joule-Thomson heat exchanger for a superfluid helium cryogenic system." Applied Thermal Engineering 180 (November 2020): 115774. http://dx.doi.org/10.1016/j.applthermaleng.2020.115774.

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10

Ahmed, Muna, Ali Al-Salihi, and Hazim Hussain. "Testing the performance of a solar energy cooling system in Baghdad city." Przegląd Naukowy Inżynieria i Kształtowanie Środowiska 30, no. 2 (July 5, 2021): 283–92. http://dx.doi.org/10.22630/pniks.2021.30.2.24.

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Renewable energy resources have become a promissory alternative to overcome the problems related to atmospheric pollution and limited sources of fossil fuel energy. The technologies in the field of renewable energy are used also to improve the ventilation and cooling in buildings by using the solar chimney and heat exchanger. This study addresses the design, construction and testing of a cooling system by using the above two techniques. The aim was to study the effects of weather conditions on the efficiency of this system which was installed in Baghdad for April and May 2020. The common weather in these months is hot in Baghdad. The test room of the design which has a size of 1 m3 was situated to face the geographical south. The test room is thermally insulated and connected to a solar chimney which generates a convection current to draw the air out of the room through a heat exchanger. The heat exchanger was submerged in a water tank of 2 m length, 1 m width and 1 m height. It was also covered with a layer of soil mixture with a thickness of 10 cm. The experiment simulates the natural conditions of a shallow water surface, connected to the room from the other side. The study results revealed that the air temperature inside the test room was lower than that of the ambient air outside. Pearson correlation coefficient showed that there was a strong direct relationship between solar radiation, temperature and wind speed from one side and the cooling efficiency from the other side. Also, there was a negative correlation between relative humidity and cooling efficiency.

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11

Nikolsky, Valeriy, Ivan Kuzyayev, Roman Dychkovskyi, Oleksandr Alieksandrov, Vadim Yaris, Serhiy Ptitsyn, Ludmila Tikhaya, et al. "A Study of Heat Exchange Processes within the Channels of Disk Pulse Devices." Energies 13, no. 13 (July 6, 2020): 3492. http://dx.doi.org/10.3390/en13133492.

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The effect of basic parameters of the channels of disk pulse devices on the heat exchange efficiency was studied both analytically and experimentally, especially in terms of pulse acting on the heat carrier. A methodology to determine the main parameters, namely the pressure and the temperature of the heat carrier as well as the pulse effect on the fluid, was proposed. The mathematical models of the effect of the structural and technological parameters of the channels in the disk pulse device on the heat exchange efficiency were developed. The models’ adequacy was proved based on a series of experimental studies involving devices with one-stage and multistage systems of pulsed heat carrier processing. This enabled the development, testing, and implementation of practical construction designs of pulse disk heat generators for decentralized heating of commercial and domestic buildings with one-stage and multistage systems of pulsed heat carrier processing. Taking into account the results of the mathematical modeling, the developed method of multistage pulse action was proved experimentally and implemented in regard to the structural design of a working chamber of the disk pulse heat generator. An efficient geometry of the working chamber of the disk pulse heat generator was specified for its further integration into the system of decentralized heat supply. One of the developed heat generators with the multistage pulse action on the heat carrier was integrated into the heating system of a greenhouse complex with a 0.86–0.9 efficiency coefficient.

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12

Zhong, Yu, Guillermo Narsilio, Nikolas Makasis, Zhangshun Li, and Gregorious Aditya. "Thermal response of energy soldier pile walls." E3S Web of Conferences 205 (2020): 06003. http://dx.doi.org/10.1051/e3sconf/202020506003.

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Utilising foundation systems as heat exchangers has received significant public interest worldwide, as these energy geo-structures can constitute a clean, renewable, and economical solution for space heating and cooling. Despite their potential, the thermal performance of energy retaining walls, especially soldier pile walls, has not been sufficiently studied and understood and thus further research is required. This work utilises the first ever energy soldier pile wall in the currently under-construction Melbourne CBD North metro station as a case study. A section of this wall has been instrumented and monitored by the University of Melbourne. Full scale thermal response tests (TRTs) have been conducted on a single thermo-active soldier pile at two different excavation levels. Thermal response testing field data results are presented in terms of mean fluid temperatures and further analysed to show the potential impact of the excavation level on the structure’s thermal performance. To further explore this impact of excavation depth (or pile embedment depth) and the long-term thermal performance of energy pile walls, a detailed 3D finite element numerical model is developed in COMSOL Multiphysics and validated against the field-testing results. The simulation suggests that thermally activating all the soldier piles in the station can provide enough energy to fulfil the heating and cooling demand of the station and to satisfy partial heating demand to the surrounding buildings. Furthermore, results suggest that current energy pile design approaches may be adapted for designing energy pile walls.

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13

Okoroigwe, Edmund C., Evidence C. Ndu, and Florence C. Okoroigwe. "Comparative evaluation of the performance of an improved solar-biomass hybrid dryer." Journal of Energy in Southern Africa 26, no. 4 (April 5, 2017): 38. http://dx.doi.org/10.17159/2413-3051/2016/v26i4a2092.

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A solar biomass hybrid dryer intially designed with a front pass flat plate solar air heater and a biomass heating stove was redesigned, reconstructed in order to minimize the excessive convective heat losses and its performance re-evaluated. Due to poor design and contruction of the biomass heating and solar collector sections, the efficiency of the initial design was low. It is believed that the drying efficiency of the dryer could be enhanced if a back pass solar collector and a biomass heating stove incorporated with a gas to gas heat exchanger to ensure that the hot air reaching the samples is clean, smokeless and ash free, substitute for the original solar collector and biomass unit respectively in the improved version. The system’s drying performance was tested on both no load and full capacity load under different meteorological conditions within Nsukka (Lat. 7oN) for two weeks. The testing results showed that the incorporation of a new back pass solar collector and the heat exchanger enhanced the trays temperatures on no load test. Similarly, the efficiency of the dryer based on solar, biomass and solar-biomass heating in drying of fresh okra, fresh groundnut and fresh cassava chips increased from 5.19 – 16.04%, 0.23 – 3.34% and 1.636 – 8.96% respectively over the initial construction. This shows that the dryer can help improve the post-harvest processing and storage quality of farm produce by drying if further optimized.

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14

Турна, Рустем Юсуфович. "РАЗРАБОТКА КОНЦЕПЦИИ ДВУХФАЗНОЙ СИСТЕМЫ ТЕПЛООТВОДА СПУТНИКА." Aerospace technic and technology, no. 1 (February 26, 2021): 31–46. http://dx.doi.org/10.32620/aktt.2021.1.04.

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For spacecraft (SC) with power unit capacity more than 4 ... 6 kW promising construction of thermal control system (TCS) based on two-phase mechanically pumped loops (2PMPL). The development of 2PMPL has been carried out quite intensively since the early '80s. However, so far there are no examples of practical implementation of such high-power systems. One of the main reasons mentioned is the novelty of the system, and insufficient study of its operation in space conditions, which adds risks. The most important component of such systems is a heat rejection subsystem (HRS), whose task is to reject heat from the coolant and radiate it into space. In its turn, HRS is also a system, the design of which requires using a system approach, considering various aspects of its operation. HRS includes a heat-hydraulic network and a radiation heat exchanger (RHE). The key elements of the HRS are condensers (CC), quite new devices for space technology. This paper presents an algorithm for the design and optimization of the heat rejection subsystem (HRS) of a satellite two-phase thermal control system. The methodology of engineering synthesis of complex technical systems and informal procedures for multi-criteria optimization of elements and subsystems at various stages of HRS design is repeatedly used. t is shown that optimization should be carried out both at the level of elements and subsystems, and at the level of the whole thermal control system. As a result of the study, the HRS design is proposed, which uses condensers in the form of smooth steel tubes of constant cross-section and their series-parallel connection scheme in the hydraulic network. Main advantages of the design: traditional for single-phase loops elements are used; operation of elements and subsystems in zero gravity conditions is predictable and allows complete testing on the ground without mandatory flight experiment; the system is operable at high saturation pressures (temperatures) (on ammonia - up to 85℃).

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15

Hanson, Francis V. "Heat exchangers selection, design and construction." Fuel Processing Technology 23, no. 1 (September 1989): 87–88. http://dx.doi.org/10.1016/0378-3820(89)90046-5.

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16

Mehrabian, M. A. "Construction, performance, and thermal design of plate heat exchangers." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 223, no. 3 (May 14, 2009): 123–31. http://dx.doi.org/10.1243/09544089jpme270.

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Much of design data for plate heat exchangers remain proprietary. A step by step methodology for determination of the exchanger size and internal geometry from the knowledge of process data is scarce. Commercial computer codes do not give the user accessibility to mathematical modelling. Engineers do not usually understand the terminology and geometry of these exchangers. This article presents a manual method for thermal design of plate heat exchangers based on physically meaningful estimations, calculations, and comparisons. When there is no close agreement, it may be necessary to change one or more of the design parameters, i.e. channel (passage) velocities, wall temperatures, or corrugation inclination angle. Considerable skill and judgment is required by the thermal design engineer at this stage to decide how the tentative design should be changed to provide a rapid solution. The experienced design engineer is often able to judge on the final decision from the first or second trial designs.

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17

KOSTUGANOV, Arman B. "RESEARCH OF HEAT DISPOSAL EFFICIENCY IN RECUPERATIVE HEAT EXCHANGERS OF AUTONOMOUS VENTILATION UNITS." Urban construction and architecture 10, no. 1 (March 15, 2020): 36–46. http://dx.doi.org/10.17673/vestnik.2020.01.6.

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Full-scale tests of recuperative heat exchangers of autonomous ventilation units of a new design were carried out in order to determine the efficiency of heat recovery in them. As a result of the tests, it was found that the efficiency of heat recovery in such recuperative heat exchangers varies from 40 to 70 %, depending on the initial parameters of the supply and exhaust air. It was also found that in order to achieve the same heat recovery effect, it is advisable to use the construction of heat exchangers with corrugated mesh than the construction with corrugated plates because the first construction with a comparable heat recovery effect provides up to one and a half times lower aerodynamic drag. During the tests was also made an approbation of a new protection scheme for recuperative heat exchangers against freezing.

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18

Guo, Pingbo, Dustin Ciepliski, and Robert Besant. "A Testing and HVAC Design Methodology for Air-to-Air Heat Pipe Heat Exchangers." HVAC&R Research 4, no. 1 (January 1, 1998): 3–26. http://dx.doi.org/10.1080/10789669.1998.10391388.

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19

Yoon, Seok, Nam Hyun Cho, Gyu Hyun Go, and Seung Rae Lee. "Performance and Economic Evaluation of Ground Heat Exchangers." Advanced Materials Research 838-841 (November 2013): 1913–16. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.1913.

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This paper presents experimental study on the evaluation of thermal performance of U and W type ground heat exchangers (GHEs). These GHEs were installed in a partially saturated landfill ground which was composed of silt and clay in the runway area of Incheon International airport. Thermal performance tests (TPTs) were conducted for 100 hours under the continuous operation condition. Heat exchange rate of individual GHE was evaluated from the TPT results, and construction cost was also estimated. The required Borehole length of U and W type GHEs was calculated considering real construction condition from GLD (ground loop design) program.

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20

Patel, A. B., and J. G. Brisson. "Design, construction, and performance of plastic heat exchangers for sub-Kelvin use." Cryogenics 40, no. 2 (February 2000): 91–98. http://dx.doi.org/10.1016/s0011-2275(00)00006-0.

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21

Cecco, V. S., and F. L. Sharp. "Recent advances in probe design for eddy current testing of heat exchangers." NDT International 22, no. 4 (August 1989): 217–21. http://dx.doi.org/10.1016/0308-9126(89)91002-x.

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22

Cecco, V. S., and F. L. Sharp. "Recent advances in probe design for eddy current testing of heat exchangers." NDT International 23, no. 6 (December 1990): 361. http://dx.doi.org/10.1016/0308-9126(90)90917-d.

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23

Cecco, V. "Recent advances in probe design for eddy current testing of heat exchangers." NDT & E International 22, no. 4 (August 1989): 217–21. http://dx.doi.org/10.1016/0963-8695(89)91015-3.

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24

Viargues, François, Gerard Claudet, and Peter Seyfert. "Construction and preliminary testing of perforated-plate heat exchangers for use in helium IIrefrigerators." Cryogenics 34 (January 1994): 325–28. http://dx.doi.org/10.1016/s0011-2275(05)80072-4.

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25

Bai, Zhenpeng, Yanfeng Li, Jin Zhang, Alan Fewkes, and Hua Zhong. "Research on the design and application of capillary heat exchangers for heat pumps in coastal areas." Building Services Engineering Research and Technology 42, no. 3 (March 10, 2021): 333–48. http://dx.doi.org/10.1177/01436244211001497.

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This study investigated the optimal design of a capillary heat exchanger device for the heat pump system and its innovative engineering application in a building. The overall aim was to use a capillary heat exchanger to obtain energy in coastal areas for promoting renewable energy in low-carbon building design. Initially, the main factors affecting the efficiency of the capillary heat exchanger were identified, a mathematical model was then established to analyse the heat transfer process. The analysis showed the flow rate and the capillary length are the key factors affecting the efficiency of the capillary heat exchanger. Secondly, to optimize the structural design of the capillary heat exchanger, the heat energy transfer is calculated with different lengths of the capillary under various flow rates in summer and winter conditions, respectively. Thirdly, a typical building is selected to analyse the application of the capillary heat exchanger for extracting energy in the coastal area. The results show the performance of the selected capillary heat exchanger heat pump system, in winter, the heat energy transfer rate is 60 W/m2 when the seawater temperature is 3.7 °C; in summer, the heat energy transfer rate is 150 W/m2 when the seawater temperature is 24.6 °C. Finally, the above field test results were examined using a numerical simulation model, the test and simulation results agree with each other quite well. This paper is conducive in promoting the development of the capillary heat exchanger heat pump as an innovative sustainable technology for net-zero energy and low carbon buildings using renewable energy in coastal areas. Practical application: A recently proposed capillary heat exchanger is used as an energy extraction and utilisation device to obtain energy in coastal areas for promoting renewable energy in low-carbon building design. This paper explores the application of a capillary heat exchanger as both cold and heat sources for application in typical low-rise buildings. The analysis of the heat energy transfer rate of a typical low-rise building located in a coastal area in summer and winter provides guidance for the application of capillary heat exchangers.

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26

Schmidt, Jens, Matthias Scheiffele, Matteo Crippa, Per F. Peterson, Eugenio Urquiza, Kumar Sridharan, Luke C. Olson, Mark H. Anderson, Todd R. Allen, and Yun Chen. "Design, Fabrication, and Testing of Ceramic Plate-Type Heat Exchangers with Integrated Flow Channel Design." International Journal of Applied Ceramic Technology 8, no. 5 (September 2011): 1073–86. http://dx.doi.org/10.1111/j.1744-7402.2010.02573.x.

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Grosso, M., and L. Raimondo. "Horizontal Air-to-Earth Heat Exchangers in Northern Italy - Testing, Design and Monitoring." International Journal of Ventilation 7, no. 1 (June 2008): 1–10. http://dx.doi.org/10.1080/14733315.2008.11683794.

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Santos, Thiago, Luiz C. Wrobel, Nick Hopper, and Maria Kolokotroni. "Numerical Design and Laboratory Testing of Encapsulated PCM Panels for PCM-Air Heat Exchangers." Applied Sciences 11, no. 2 (January 12, 2021): 676. http://dx.doi.org/10.3390/app11020676.

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Heat transfer between encapsulated PCM panels and air plays an important role in PCM-Air heat exchangers. A new design for the encapsulation panel was developed considering practical aspects such as the cost of production and ease of manufacturing, in addition to heat transfer and pressure drop. A number of encapsulated panel surfaces were first investigated via 3D CFD simulations and compared with an existing panel in use by a commercial PCM-Air heat exchanger manufacturer. After validation, 2D CFD simulations were carried out for 32 different geometries to select the most effective design, which was fabricated and tested in the laboratory. Laboratory parameters tested included heat transfer, pressure drop and melting/solidifying. The laboratory results confirmed the improvements of the new panel in comparison with the existing panel and a flat panel. It was found that the proposed design doubled the heat transfer, holds 13.7% more material and the fan can overcome the increased pressure drop.

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Journal, Baghdad Science. "Parabolic Trough Solar Collector – Design, Construction and Testing." Baghdad Science Journal 8, no. 2 (June 12, 2011): 658–65. http://dx.doi.org/10.21123/bsj.8.2.658-665.

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This paper presents the design, construction and investigates an experimental study of a parabolic Trough Solar Collector (PTSC). It is constructed of multi – piece glass mirror to form the parabolic reflector (1.8 m ? 2.8 m) its form were checked with help of a laser and carbon steel rectangular as receiver. Sun tracker has been developed (using two – axis) to track solar PTSC according to the direction of beam propagation of solar radiation. Using synthetic oil as a heat transfer its capability to heat transfer and load high temperature (?400 oc). The storage tank is fabricated with stainless steel of size 50 L. The experimental tests have been carried out in Baghdad climatic conditions (33.3o N, 44.4o E) during selective days of the months October and November. The performance of PTSC is evaluated using outdoor experimental measurements including the useful heat gain, the thermal instantaneous efficiency and the energy gained by the storage tank oil. The storage tank oil temperature is increased from 30oc at 9:30h to 136oc at 13:30h without draw – off oil. The experimental result shows the average thermal efficiency was 42% which is fairly acceptable assessment results of a PTSC locally.

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30

Liang, Shao Qing. "Ground Source Heat Pump Air Conditioning System of Vertical Geothermal Heat Exchangers Heat Transfer Process and Design Calculation Method." Applied Mechanics and Materials 291-294 (February 2013): 1728–34. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.1728.

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Geothermal heat exchanger is an important part of the GSHP air-conditioning system and different from other traditional air-conditioning systems. This article through to the geothermal heat exchanger heat transfer performance analysis and the design, derived from the geothermal heat exchanger length calculation formula, for actual engineering construction to provide a scientific basis.

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31

Wei, Kejuan, Wenxin Li, Jiarong Li, Yong Wang, and Lu Zhang. "Study on a design method for hybrid ground heat exchangers of ground-coupled heat pump system." International Journal of Refrigeration 76 (April 2017): 394–405. http://dx.doi.org/10.1016/j.ijrefrig.2016.12.020.

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32

Sliwa, Tomasz, Aneta Sapińska-Śliwa, Andrzej Gonet, Tomasz Kowalski, and Anna Sojczyńska. "Geothermal Boreholes in Poland—Overview of the Current State of Knowledge." Energies 14, no. 11 (June 2, 2021): 3251. http://dx.doi.org/10.3390/en14113251.

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Geothermal energy can be useful after extraction from geothermal wells, borehole heat exchangers and/or natural sources. Types of geothermal boreholes are geothermal wells (for geothermal water production and injection) and borehole heat exchangers (for heat exchange with the ground without mass transfer). The purpose of geothermal production wells is to harvest the geothermal water present in the aquifer. They often involve a pumping chamber. Geothermal injection wells are used for injecting back the produced geothermal water into the aquifer, having harvested the energy contained within. The paper presents the parameters of geothermal boreholes in Poland (geothermal wells and borehole heat exchangers). The definitions of geothermal boreholes, geothermal wells and borehole heat exchangers were ordered. The dates of construction, depth, purposes, spatial orientation, materials used in the construction of geothermal boreholes for casing pipes, method of water production and type of closure for the boreholes are presented. Additionally, production boreholes are presented along with their efficiency and the temperature of produced water measured at the head. Borehole heat exchangers of different designs are presented in the paper. Only 19 boreholes were created at the Laboratory of Geoenergetics at the Faculty of Drilling, Oil and Gas, AGH University of Science and Technology in Krakow; however, it is a globally unique collection of borehole heat exchangers, each of which has a different design for identical geological conditions: heat exchanger pipe configuration, seal/filling and shank spacing are variable. Using these boreholes, the operating parameters for different designs are tested. The laboratory system is also used to provide heat and cold for two university buildings. Two coefficients, which separately characterize geothermal boreholes (wells and borehole heat exchangers) are described in the paper.

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33

Kheiri, A., M. Feidt, R. Boussehain, M. Costea, and T. Popescu. "Refrigerant charge reduction: On a new design optimization criterion for compact heat exchangers." International Journal of Refrigeration 34, no. 6 (September 2011): 1462–70. http://dx.doi.org/10.1016/j.ijrefrig.2011.04.010.

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34

Bahrehmand, Hesam, and Majid Bahrami. "An analytical design tool for sorber bed heat exchangers of sorption cooling systems." International Journal of Refrigeration 100 (April 2019): 368–79. http://dx.doi.org/10.1016/j.ijrefrig.2019.02.003.

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35

Yau, YH, and M. Ahmadzadehtalatapeh. "The empirical study of a four-row heat pipe heat exchanger to predict the year-round energy recovery in the tropics." Building Services Engineering Research and Technology 32, no. 4 (February 23, 2011): 307–27. http://dx.doi.org/10.1177/0143624410397919.

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The effect of heat pipe heat exchanger on the heat recovery was studied in the tropics. The performance of the heat exchanger was monitored during the one week of operation (168 h) to find out the performance characteristic curves. Three coil face velocities namely, 2, 2.2 and 2.5 m/s were tested and the temperature of return air was controlled at 24°C. The relevant empirical equations were then employed for the hour-by-hour prediction of the energy recovery by the heat pipe heat exchanger for the whole year. The impact of inside design temperature on the heat recovery by the heat exchanger was also studied. The thermal performance of the heat pipe heat exchanger was simulated based on the effectiveness-NTU method and the theoretical values were compared with the experimental data. Practical application: Performance improvement of the heating, ventilating and air conditioning systems is a challenge to the designers. The results obtained from this research work could serve as a practical guide for engineers who are intending to use heat pipe heat exchangers in the heating, ventilation and air conditioning systems operating in tropical climates. Engineers and researchers have the potential to use the recommended empirical performance equations to examine the impact of heat pipe heat exchangers on the performance of the current air conditioning systems. Moreover, these empirical performance equations enable the year-round operating effect of heat pipe heat exchangers on energy savings to be predicted realistically.

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36

Lee, Hyeong Yeon, Jae Han Lee, Tae Ho Lee, Jae Hyuk Eoh Lee, Tae Joon Kim, and Yong Bum Lee. "Construction of a High Temperature Grade 91 Sodium Component Test Loop." Materials Science Forum 654-656 (June 2010): 416–19. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.416.

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A large scale sodium test facility of ‘CPTL’(Component Performance Test Loop) for simulating thermal hydraulic behavior of the Korean demonstration fast reactor components such as IHX(Intermediate Heat Exchanger), DHX(Decay Heat Removal Heat Exchanger) and sodium pump under development by KAERI is to be constructed. The design temperature of this test loop is 600°C and design pressure is 1MPa. The three heat exchangers are made of Grade 91 steel. Another sodium test facility of the ‘STEF’(Sodium Thermal-Hydraulic Experimental Facility) will be constructed next to the CPTL facility to simulate the passive decay heat removal behavior in the sodium cooled fast reactor. In this paper, the overall facility features of the CPTL and STEF are introduced and preliminary conceptual design of the facilities are carried out.

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37

Prashantha, B. G., M. S. Govinde Gowda, S. Seetharamu, and G. S. V. L. Narasimham. "Design Construction and Performance of 10W Thermoacoustic Refrigerators." International Journal of Air-Conditioning and Refrigeration 25, no. 03 (September 2017): 1750023. http://dx.doi.org/10.1142/s2010132517500237.

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In this paper, the construction and performance of the 10[Formula: see text]W cooling power thermoacoustic refrigerators designed for a temperature difference of 120 K at 3% drive ratio are discussed. The construction and assembly procedure of the optimized thermoacoustic refrigerator components viz. spiral stack, heat exchangers, 0.28[Formula: see text]-taper, small diameter tube and divergent section with hemispherical end (TSDH) and 0.24[Formula: see text]-taper and divergent section with hemispherical end (TDH) resonator designs and loudspeaker found in the published literature, and instrumentation are discussed. The performance of the 0.28[Formula: see text]-TSDH, and 0.24[Formula: see text]-TDH resonator designs, and the uncertainties involved in the experimental measurements are discussed. Both the resonator designs show good behavior. A decent low temperature of [Formula: see text]11.3[Formula: see text]C and [Formula: see text]8.7[Formula: see text]C at 10[Formula: see text]W cooling power is achieved at the cold heat exchanger for the 0.28[Formula: see text]-TSDH and 0.24[Formula: see text]-TDH resonator designs, respectively. The comparative analysis of the experimental results with the theoretical and DeltaEC results is discussed.

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38

Bhattacharjee, Shuvashish, A. N. M. Mizanur Rahman, and Saad Bin Abul Kashem. "Construction and Testing of a Bent Heat Pipe." Asia Pacific Journal of Energy and Environment 6, no. 1 (June 30, 2019): 7–14. http://dx.doi.org/10.18034/apjee.v6i1.258.

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Heat pipe was reviewed in former time which was in linear design. But in most cases, the heat pipe is needed in a bent shape. For instance, in a car, the heat transfer way from the engine to the radiator is not in linear. To move heat from parts in a computer i.e. central processing units of the computer may use non-linear heat pipe to reduce the heat generated in it. So the performance analysis for a bent heat pipe is badly needed to fulfill the current demand. In this research, a bent heat pipe was constructed and the performance analysis have been conducted on the bent heat pipe.

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Ebieto, C. E., R. R. Ana, O. E. Nyong, and E. G. Saturday. "Design and Construction of a Double Pipe Heat Exchanger for Laboratory Application." European Journal of Engineering Research and Science 5, no. 11 (November 8, 2020): 1301–6. http://dx.doi.org/10.24018/ejers.2020.5.11.1950.

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Engineering education is incomplete without laboratory practices. One of such laboratory equipment necessary for all engineering students to have hands-on in the course of their undergraduate studies is the heat exchanger. This work presents the detailed design and construction of a laboratory type double pipe heat exchanger that can be used both in the parallel and counter flow configuration. The heat exchanger was constructed using galvanized steel for both the tube and shell. Experiments were designed and carried out to test the performance of the heat exchangers. The heat exchanger performance characteristics (logarithm mean temperature difference (LMTD), heat transfer rate, effectiveness, and overall heat transfer coefficient) were obtained and compared for the two configurations. The LMTD tends to be relatively constant as the flow rate was increased for both the parallel and counter-flow configuration but with a higher value for the parallel flow configuration. The heat exchanger has a higher heat transfer rate, effectiveness, and overall heat transfer coefficient and therefore has more performance capability for the counter-flow configuration. The overall heat transfer coefficient increased as the flow rate increased for both configurations. Importantly, as a result of this project, Mechanical Engineering students can now have hands-on laboratory experience on how the double pipe heat exchanger works.

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Jiang, Haobo, Vikrant Aute, and Reinhard Radermacher. "CoilDesigner: a general-purpose simulation and design tool for air-to-refrigerant heat exchangers." International Journal of Refrigeration 29, no. 4 (June 2006): 601–10. http://dx.doi.org/10.1016/j.ijrefrig.2005.09.019.

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41

Azwinur, Azwinur, and Zulkifli Zulkifli. "KAJI EKSPERIMENTAL PENGARUH BAFFLE PADA ALAT PENUKAR PANAS ALIRAN SEARAH DALAM UPAYA OPTIMASI SISTEM PENGERING." SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin 13, no. 1 (June 1, 2019): 8. http://dx.doi.org/10.24853/sintek.13.1.8-14.

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Heat exchangers or heat exchangers are tools used to change the temperature of the fluid or change the fluid phase by exchanging heat with another fluid. In a heat exchanger, the ability to exchange heat is largely determined by the type of fluid flow and fluid passing through the heat exchanger. The use of heat exchangers in the field of drying is now a necessity to overcome the problems of drying productivity. The purpose of this study was carried out to determine the effectiveness of the heat exchanger experimentally based on directional flow by comparing construction using baffle and without using baffle in an effort to optimize the drying system. The research method was carried out by fabricating 2 units of heat exchangers and by field testing. The test data obtained are the input and output temperatures of the heating fluid flow and cooling fluid flow and flow velocity. Based on preliminary research data shows that the use of baffle affects the increase in temperature on the heat exchanger, where at the fresh air outlet that does not use baffle produces a temperature of 72oC while the baffle produces 88oC with the Log Mean Temperature Difference heat exchanger without using a baffle higher than heat exchanger that uses a baffle guide blade. This can illustrate that the smaller heat losses are wasted so that the absorption of heat by the reverse system will be higher.

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42

Gunko, Iryna, Ivan Sevostyanov, and Yuriy Orlyuk. "RESEARCH OF THE DIRECTIONS OF IMPROVEMENT OF PLATE EXCHANGER HEAT EXCHANGERS." ENGINEERING, ENERGY, TRANSPORT AIC, no. 2(105) (May 31, 2019): 59–65. http://dx.doi.org/10.37128/2520-6168-2019-2-8.

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The article provides an analysis of the known schemes of plate heat exchangers, their advantages and disadvantages, as well as areas for improvement. Taking into account the results of the analysis conducted in the department of dairy products of the Institute of Food Resources of the National Academy of Agrarian Sciences of Ukraine, the All-Ukrainian Scientific Research Educational Consortium, the authors developed an improved plate heat exchanger scheme, which combines high reliability, energy efficiency and heating rate of the coolant with simplicity, compactness and low construction cost, with ease of maintenance and repair (easy disassembly and cleaning). The dependences for the calculation of the main design and operating parameters of an improved heat exchanger are given.

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43

Choi, Jeehoon, Yuan Yuan, Diana-Andrea Borca-Tasciuc, and Hwankook Kang. "Design, construction, and performance testing of an isothermal naphthalene heat pipe furnace." Review of Scientific Instruments 85, no. 9 (September 2014): 095105. http://dx.doi.org/10.1063/1.4894526.

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44

Doodman, A. R., M. Fesanghary, and R. Hosseini. "A robust stochastic approach for design optimization of air cooled heat exchangers." Applied Energy 86, no. 7-8 (July 2009): 1240–45. http://dx.doi.org/10.1016/j.apenergy.2008.08.021.

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45

Aceves-Saborio, S., J. Ranasinghe, and G. M. Reistad. "An Extension to the Irreversibility Minimization Analysis Applied to Heat Exchangers." Journal of Heat Transfer 111, no. 1 (February 1, 1989): 29–36. http://dx.doi.org/10.1115/1.3250654.

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The irreversibility minimization method of heat exchanger optimization is extended to include a term to account for the exergy of the material of construction of the heat exchanger. The method permits physically realistic optimization to be conducted with the resulting optimum designs providing conceptually beneficial guideposts, which do not change with time or location. Such optima are in contrast to the optima obtained by presently advocated methods, which on one hand indicate unrealistic infinite area heat exchangers, and on the other hand point to optima that may change dramatically with location and time. Although the analysis presented here does not represent a “cure-all” for heat exchanger analysis (economic optimization is still recommended), it does provide valuable conceptual insights and nonchanging guideposts for optimal design. Accompanying exergetic efficiency expressions using the same type of material exergy term show physically more realistic values than the usual expressions.

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46

Wang, Juanping, Seyed Saeed Hashemi, Saeideh Alahgholi, Mohsen Mehri, Mehdi Safarzadeh, and Ashkan Alimoradi. "Analysis of Exergy and energy in shell and helically coiled finned tube heat exchangers and design optimization." International Journal of Refrigeration 94 (October 2018): 11–23. http://dx.doi.org/10.1016/j.ijrefrig.2018.07.028.

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47

Qian, Hongliang, and Pega Hrnjak. "Design and calibration of capacitive sensors for measuring void fraction in vertical headers of microchannel heat exchangers." International Journal of Refrigeration 129 (September 2021): 224–36. http://dx.doi.org/10.1016/j.ijrefrig.2021.05.012.

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48

Ventola, Luigi, Matteo Fasano, Roberta Cappabianca, Luca Bergamasco, Francesca Clerici, Luciano Scaltrito, Eliodoro Chiavazzo, and Pietro Asinari. "Convective Heat Transfer Enhancement through Laser-Etched Heat Sinks: Elliptic Scale-Roughened and Cones Patterns." Energies 13, no. 6 (March 15, 2020): 1360. http://dx.doi.org/10.3390/en13061360.

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The efficient dissipation of localized heat flux by convection is a key request in several engineering applications, especially electronic ones. The recent advancements in manufacturing processes are unlocking the design and industrialization of heat exchangers with unprecedented geometric characteristics and, thus, performance. In this work, laser etching manufacturing technique is employed to develop metal surfaces with designed microstructured surface patterns. Such precise control of the solid-air interface (artificial roughness) allows to manufacture metal heat sinks with enhanced thermal transmittance with respect to traditional flat surfaces. Here, the thermal performance of these laser-etched devices is experimentally assessed by means of a wind tunnel in a fully turbulent regime. At the highest Reynolds number tested in the experiments ( R e L ≈ 16 , 500 ), elliptic scale-roughened surfaces show thermal transmittances improved by up to 81% with respect to heat sinks with flat surface. At similar testing conditions, cones patterns provide an enhancement in Nusselt number and thermal transmittance of up to 102% and 357%, respectively. The latter results are correlated with the main geometric and thermal fluid dynamics descriptors of the convective heat transfer process in order to achieve a predictive model of their performance. The experimental evidence shown in this work may encourage and guide a broader use of micro-patterned surfaces for enhancing convective heat transfer in heat exchangers.

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Alsultany, Forat H., and Qasim S. Kadhim. "Based on the Matrix of Silicon Nanocrystals a Modeling Study of Thermo-hydraulic Properties of Micro-channel Heat Transfer Elements." NeuroQuantology 19, no. 3 (April 13, 2021): 38–45. http://dx.doi.org/10.14704/nq.2021.19.3.nq21026.

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The construction of a heat exchange element based on a matrix of silicon whiskers for thermal stabilization systems of miniature heat sources with specific power up to 100 W/cm2 operating over a wide range of ambient temperatures is proposed. Based on the developed mathematical model of convective heat transfer in a microchannel compact heat exchanger with a developed heat exchange surface, numerical simulation of the hydrodynamics and heat transfer processes for various configurations of microchannel insertions was carried out. Fields of pressures, flow velocities, coolant temperatures and matrix from silicon single crystals have been obtained in a wide range of coolant flow rates, criteria dependencies for the Nusselt number and pressure losses of various geometric configurations of heat exchangers have been determined. Critical operation modes are investigated; optimization directions are proposed. According to the developed technology, prototypes for testing have been manufactured.

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Niewitecka, Kaja. "Possibilities of heat energy recovery from greywater systems." E3S Web of Conferences 30 (2018): 03003. http://dx.doi.org/10.1051/e3sconf/20183003003.

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Waste water contains a large amount of heat energy which is irretrievably lost, so it is worth thinking about the possibilities of its recovery. It is estimated that in a residential building with full sanitary fittings, about 70% of the total tap water supplied is discharged as greywater and could be reused. The subject of the work is the opportunity to reuse waste water as an alternative source of heat for buildings. For this purpose, the design of heat exchangers used in the process of greywater heat recovery in indoor sewage systems, public buildings as well as in industrial plants has been reviewed. The possibility of recovering heat from waste water transported in outdoor sewage systems was also taken into consideration. An exemplary waste water heat recovery system was proposed, and the amount of heat that could be obtained using a greywater heat recovery system in a residential building was presented. The work shows that greywater heat recovery systems allow for significant savings in preheating hot tap water, and the rate of cost reimbursement depends on the purpose of the building and the type of installation. At the same time, the work shows that one should adjust the construction solutions of heat exchangers and indoor installations in buildings to the quality of the medium flowing, which is greywater.

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