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Relevant bibliographies by topics / Absorption heat pump

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Academic literature on the topic 'Absorption heat pump'

Author: Grafiati

Published: 4 June 2021

Last updated: 29 May 2022

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Journal articles on the topic "Absorption heat pump"

1

Wang, Ze, Honghong Shen, Qunyin Gu, Daoyuan Wen, Gang Liu, Weijun Gao, and Jianxing Ren. "Economic Analysis of Heat Pump Recovery System for Circulating Water Waste Heat in Power Plant." E3S Web of Conferences 256 (2021): 02011. http://dx.doi.org/10.1051/e3sconf/202125602011.

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The use of heat pump technology to recover the waste heat of circulating water from the power plant instead of steam extraction for heating can not only improve the thermal efficiency of the unit and reduce the loss of cold source, but also has great advantages in energy saving. This paper uses absorption and compression heat pumps to recover the waste heat of circulating water in the power plant to study its energy-saving benefits. Under the same heating load, the economics of the two heat pumps are calculated and analyzed. The results show that the energy-saving benefits of absorption heat pump units are far greater than compression units. But in terms of water saving, the water saving capacity of the compression heat pump unit is higher than that of the absorption heat pump.

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L. Szabó, Gábor. "Thermo-Chemical Instability and Energy Analysis of Absorption Heat Pumps." Energies 13, no. 8 (April 16, 2020): 1966. http://dx.doi.org/10.3390/en13081966.

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This paper presents the results of energy analysis of absorption heat pumps. The thermo-chemical instability term was introduced for absorption heat pumps used for heating or cooling or heating and cooling. A higher thermo-chemical instability results in the equipment being more sensitive with regard to the variation of the heat source flux. This sensitivity can be taken into account when heat sources are chosen for a certain absorption machine. Absorption heat pumps having thermo-chemical compressors were compared from energy demand and energy efficiency points of view with heat pumps having mechanical compressors. As it is shown, for certain evaporation and condensation temperature values, an absorption heat pump with similar efficiency to that of the heat pump with a mechanical compressor can always be found.

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Yu, Hai Hong, Qiao Li Cao, Ming Hui Cui, and Xin Wang. "The Research of Absorption Heat Pump Taking Basic Heat Load City Heat-Supply Network Heating Regulation Optimization." Applied Mechanics and Materials 587-589 (July 2014): 325–29. http://dx.doi.org/10.4028/www.scientific.net/amm.587-589.325.

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This paper aiming at absorption heat pump maximizing annual heating quantity, with the goal of thermal power plant absorption heat pump heating earnings in different heating regulation mode, set up calculation model of absorption heat pump heating earnings, analysis heat-supply network backwater temperature fluctuations and heat pump heating quantity difference in different heating regulation mode, discuss optimization approach of absorption heat pump taking basic heat load city heat-supply network heating regulation, calculate heat pump heating earnings finally. The results showed that the pure quality regulation can get the best economic benefits of absorption heat pump.

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Sekret, Robert, and Anna Nitkiewicz. "Exergy analysis of the performance of low-temperature district heating system with geothermal heat pump." Archives of Thermodynamics 35, no. 1 (March 1, 2014): 77–86. http://dx.doi.org/10.2478/aoter-2014-0005.

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Abstract Exergy analysis of low temperature geothermal heat plant with compressor and absorption heat pump was carried out. In these two concepts heat pumps are using geothermal water at 19.5 oC with spontaneous outflow 24 m3/h as a heat source. The research compares exergy efficiency and exergy destruction of considered systems and its components as well. For the purpose of analysis, the heating system was divided into five components: geothermal heat exchanger, heat pump, heat distribution, heat exchanger and electricity production and transportation. For considered systems the primary exergy consumption from renewable and non-renewable sources was estimated. The analysis was carried out for heat network temperature at 50/40 oC, and the quality regulation was assumed. The results of exergy analysis of the system with electrical and absorption heat pump show that exergy destruction during the whole heating season is lower for the system with electrical heat pump. The exergy efficiencies of total system are 12.8% and 11.2% for the system with electrical heat pump and absorption heat pump, respectively.

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Riffat, S. B., N. J. Shankland, and C. W. Wong. "Rotary absorption - recompression heat pump." Building Services Engineering Research and Technology 15, no. 1 (February 1994): 27–30. http://dx.doi.org/10.1177/014362449401500105.

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Garimella, Srinivas, J. W. Coleman, and A. Wicht. "DESIGN OF ABSORPTION-HEAT-PUMP HEAT EXCHANGERS." Journal of Enhanced Heat Transfer 24, no. 1-6 (2017): 211–30. http://dx.doi.org/10.1615/jenhheattransf.v24.i1-6.150.

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Kiatsiriroat, T., S. C. Bhattacharya, and P. Wibulswas. "Upgrading heat by a reversed absorption heat pump." Applied Energy 25, no. 3 (January 1986): 175–86. http://dx.doi.org/10.1016/0306-2619(86)90024-3.

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Lazzarin, R. M., G. A. Longo, and F. Piccininni. "An open cycle absorption heat pump." Heat Recovery Systems and CHP 12, no. 5 (September 1992): 391–96. http://dx.doi.org/10.1016/0890-4332(92)90060-u.

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Zhao, Xi Ling, Zhong Hai Zheng, Lin Fu, and Yan Li. "Application Analysis of the BCHP System with the Soil Source Absorption Heat Pump Driven by the Flue Gas." Applied Mechanics and Materials 170-173 (May 2012): 2747–50. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.2747.

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How to use the waste heat deeply are a critical issue for BCHP (Building combined cooling heating and power) system. A BCHP system with a soil source absorption heat pump driven by the waste heat is proposed. The system is composed of an internal combustion engine, a soil source absorption heat pump driven by the flue gas, and other assistant facilities, such as pumps, fans, and end user devices. In the winter, the flue gas is used to drive absorption heat pump to recover the waste heat of the soil source and the condensation heat of the flue gas simultaneously, and in the summer, the waste heat of the flue gas is used to drive absorption heat pump to cooling, and the heat sink is the soil. In the paper, the configuration of this kind of system is designed, and the energy analysis of the system is done all the year. Compared with the conventional BCHP system, the operation cost is lowered greatly and the increased investment could be returned within one year. It is show that the system is the efficient integration of cleaning energy, renewable energy, the discharge of the flue gas could be reduced to below 30°C, and the water steam could be catch to avoid the white smoke of the stack. The energy saving in space heating could be 66% compared with the conventional BCHP systems.

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LABUS, J., M. A. MARIMON, and A. CORONAS. "EXPERIMENTAL EVALUATION OF A SMALL CAPACITY H2O–LiBr ABSORPTION HEAT PUMP IN COOLING AND HEATING MODES." International Journal of Air-Conditioning and Refrigeration 18, no. 04 (December 2010): 317–25. http://dx.doi.org/10.1142/s2010132510000319.

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This study describes the experimental analysis of a small-scale H2O–LiBr absorption heat pump of 4.5 kW cooling and 8 kW heating capacity. The water-cooled heat pump is activated by hot water which can be supplied by solar collectors or a gas boiler. For the purpose of the performance analysis, the absorption heat pump was tested in a multifunctional test bench built up at the University Rovira i Virgili in Tarragona, Spain. The absorption heat pump was tested by varying the main operating parameters of the external water circuits, such as temperature and flow rate. Finally, this work resulted in complete performance evaluation of absorption heat pump, including heat losses and experimental uncertainties.

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Dissertations / Theses on the topic "Absorption heat pump"

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Schaefer, Laura Atkinson. "Single presssure absorption heat pump analysis." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/17924.

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Santoyo-Gutierrez, Socrates. "Absorption heat pump assisted effluent purification." Thesis, University of Salford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245055.

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Gigos, Pierre-Antoine. "Modelling a Solar Driven Absorption Heat Pump." Thesis, KTH, Tillämpad termodynamik och kylteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185684.

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Absorption Heat Pumps (AHP) have been developed since the late 19th century. They enable to produce cooling and heating directly from a heat source, unlike Compression Heat Pumps that require mechanical work. In the context of scarcity of resources and global warming, the company Helioclim develops solar air conditioning using an Absorption Heat Pump. The heat is gathered at rooftop solar concentrators and powers an ammonia-water AHP. The present study proposes an EES model of Helioclim’s AHP allowing assessing its performances under various operating conditions. Another aspect developed is the Modelling of the whole system (from solar energy to the economic assessment) in order to find the best parameters to propose to a potential client. Regarding EES model, three existing EES examples of AHP have been used. Those models, ranging from the simple single-stage ammonia AHP to a more complex GAX-cycle, did not correspond exactly to the features of Helioclim’s cycle. Therefore, a new model has been built: the position of the GAX and its connections to the other heat exchangers have been adapted and a recirculation in the generator has been proposed in order to correspond to Helioclim’s design. The model obtained is then used to assess the improvement of the performances with the GAX. It is also compared to the available experimental data. In the present study, a software program representing the whole solar air conditioning system is also developed, integrating the previous EES model. The software program considers the solar energy gathered by the collectors and deduces the energy transmitted to the heat pump. The EES model is then used to assess the performances of the heat pump in the operating conditions, allowing determining the produced cooling and heating. An economic and energy synthesis is produced, summarizing effectively the parameters and economic advantages of the installation. This software program allows sizing an installation for a client much more quickly than before.

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Forinash, David Michael. "Novel air-coupled heat exchangers for waste heat-driven absorption heat pumps." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53897.

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A detailed investigation of novel air-coupled absorbers for use in a diesel engine exhaust-driven ammonia-water absorption system operating in extreme ambient conditions was conducted. Electrically driven vapor-compression systems are under scrutiny due to the environmental impact of synthetic refrigerants and the exacerbation of electric utility loads during peak demand periods. One alternative to vapor-compression systems is the absorption heat pump that uses environmentally benign working fluids and can be driven by a variety of heat sources, including waste heat and solar thermal processes. Direct air coupling of the absorber and condenser instead of indirect hydronic coupling can reduce absorption system size, complexity, and inefficiency, but materials compatibility issues with ammonia-water and the poor heat transfer properties of air present challenges. Heat and mass transfer modeling was used to predict the performance of round-tube corrugated-fin and compact tube-array absorbers designed for a 2.64-kW absorption chiller operated in high ambient temperature (51.7°C) conditions. A single-pressure ammonia-water test facility was constructed and used in conjunction with a temperature- and humidity-controlled air-handling unit to evaluate the absorbers at design and off-design operating conditions. Absorber performance was recorded over a range of air temperatures (35-54.4°C), air flow rates (0.38-0.74 m3 s-1), inlet solution temperatures (92-102°C), concentrated solution flow rates (0.006-0.010 kg s-1), and concentrated solution concentrations (38-46%). At design conditions, round-tube corrugated-fin absorbers of 394 and 551 Fins Per Meter (FPM) demonstrated comparable performance (Q394-FPM,exp = 4.521±0.271 kW; Q551-FPM,exp = 4.680±0.260 kW), and measured heat transfer rates were 0.7-1.9% AAD higher than those predicted through modeling. The measured heat transfer rate in the prototype tube-array absorber was significantly lower than the values predicted at design conditions (Qprot,exp = 2.22±0.24 kW; Qprot,mod = 4.33 kW). Maldistribution of the two-phase flow in the tube array is the probable cause of the disparity between the prototype absorber data and model predictions. Results from this investigation can be used to guide the development of air-coupled heat and mass exchangers for compact absorption heat pumps.

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Vodenicker, John P. III. "Three dimesional graphics for the analysis of absorption heat pump cycles." Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/17401.

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Keinath, Christopher Mahlo. "Direct-fired heat pump for multi-pass water heating using microchannel heat and mass exchangers." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54330.

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Absorption heat pump water heaters offer improved performance compared to conventional direct-fired water heaters, with the potential for coefficients of performance well in excess of 1. A primary energy usage comparison with electric heat pumps shows that absorption systems can be competitive with current technology. However, the implementation of these systems in the residential and light commercial market has not been practical for several reasons, including a limited knowledgebase on absorption systems for this application and the lack of compact and economically viable heat and mass exchangers. An improved understanding of the coupled heat and mass transfer processes in thermally driven absorption systems to be used as heat pump water heaters was obtained over the course of this study. In addition, microchannel heat and mass exchangers that enable such compact gas-fired heat pump water heaters were developed and tested. Performance at design and off-design conditions over a range of water and ambient temperatures was simulated in detail with a system-level model developed for this purpose. The system-level model was coupled with a water-tank model to investigate several water heating scenarios including a cold start, response to a medium sized draw and response to stand-by losses. Heat and mass exchangers were designed using component-level heat and mass transfer models. The heat and mass exchangers were first installed and evaluated on a breadboard test facility. Insights from these experiments were then used to design and fabricate a monolithic unit integrating several of the microchannel heat and mass exchangers, coupled with a gas-fired desorber heat exchanger to yield a stand-alone water heater prototype. The performance of the prototype was investigated over a range of water and ambient temperatures. A comparison of results was performed to investigate the deviation between model predictions and experimental values. A refined model was developed that more accurately predicted experimental results. Energy-use and cost analyses were performed and showed the potentially significant energy savings of thermally driven heat pump water heaters.

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Kim, Sarah Sungeun. "An absorption refrigeration system using ionic liquid and hydrofluorocarbon working fluids." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/51783.

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Efficient heat management in energy intensive applications such as server and data centers has become a national concern due to the magnitude of the energy consumed. In that matter, the absorption refrigeration system is an attractive solution because the abundant waste heat available in the data centers can be recycled to run the heat pump, which will bring about significant cooling cost savings. The use of absorption refrigeration has been limited due to the drawbacks related to the working fluids in commercially available equipment. Recently, ionic liquids (ILs) have been suggested as the absorbent in absorption heat pumps due to their tunable properties, negligible volatility and high thermal stability. The non-random-two-liquid-model was initially used to analyze the feasibility of the new IL based working fluid. Hydrofluorocarbons (HFCs) were paired with IL absorbents due to their good properties as refrigerants. The cooling-to-total-energy (CE) efficiency had a local maximum with respect to desorber temperature due to the solubility limit at lower temperatures and large heating requirements at higher temperatures. The waste heat recycling coefficient of performance (COP) continually increased with respect to desorber temperature and among the HFCs studied in this work, R134 gave the highest COP value, which is up to 40 times higher than that of typical vapor compression systems and 60 times higher than NH3/H2O and H2O/LiBr absorption refrigeration systems. A Redlich-Kwong equation of state (RK-EOS) was employed for accurate computation of mixture properties over a wide range of operating conditions. Analysis using the RK-EOS model showed that the CE trend in refrigerants followed the trend of solubility in the [bmim][PF6] IL. However, the trend in COP was different from that of CE as the operating pressure ranges became an important factor. Required pumping work of the working fluids has also been analyzed using a two phase pressure drop equation and the results show that the impact of viscous IL flow is insignificant compared to the total pumping work. The HFCs studied in this work have very similar structures. However, the extent of solubility and system efficiency in the same IL, [bmim][PF6], made a large difference. Most surprisingly, even when the refrigerant had the same chemical formula, the change in fluorine position in tetrafluoroethane showed significantly different system performance. The symmetrical tetrafluoroethane had superior CE and COP over the asymmetrical tetrafluoroethane most likely due to the higher probability to form hydrogen bonding with the absorbent. The computational results for various HFC/IL pairs show that in selecting the working fluid pairs, the refrigerant should have high overall solubility in the IL and a large gradient of solubility with respect to temperature. Also, refrigerants with small pressure ranges are preferred. In addition to the simulation study, a bench-top absorption refrigeration system was built and operated using IL based working fluids for the first time. The effect of cooling was observed by operating the test system. The experimental results were congruent with the predictions from the modeling work. In conclusion, an absorption refrigeration system based on the IL chemical compressor has been shown to be a promising solution in applications which need efficient cooling and generate abundant waste heat.

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Borgås, Anders. "Development of the Hybrid Absorption Heat Pump Process at High Temperature Operation." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26361.

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Hybrid heat pumps with ammonia/water mixtures are identified as one of the most promising high temperature heat pump technologies. They are especially suited for processes with high temperature lifts, flexible regarding capacity control and external changes and enable the use of ammonia at higher temperatures than conventional vapour-compression heat pumps. A two-stage compression/absorption heat pump simulation model was developed in order to evaluate the thermodynamic process for high temperature operation. In simulation scenarios, waste heat was available at 50°C and the aim was to heat process water from 100°C to 150°C. Heat pump performance, temperature levels and pressure levels were some of the key results of the simulations. Secondary, it was developed a simulation model of a finned, annular tube cross-flow absorber in order to assess the dimensions of an absorber for heating air with an ammonia/water mixture. Both models were used in a simulation case where the compression/absorption heat pump was integrated in a spray drying process utilizing waste heat air at 35 °C.Simulations with the two-stage model showed that the scenarios with high water content in the vapour before the compressor, achieved the highest performances. Circulation ratios were higher, which resulted in a larger fraction of the mixture mass flow went through the compressor circuit, hence smaller compressor work. Although pressure ratios were higher, resulting absorber pressures were significantly lower. Some of the disadvantages with high water content were higher discharge temperatures, although discharge temperatures were high in all scenarios, and considerably lower vapour densities. In simulations were the discharge temperature was limited to 180 °C, the highest achieved COP was 1.81, while in simulations with no limitations to the discharge temperature, the highest COP was 2.53. Moreover, simulation scenarios without limitations to the discharge temperature resulted in lower absorber pressures, hence lower pressure ratios and higher performances. However, it resulted in discharge temperatures as high as 310 °C. Simulations with a desuperheater showed, provided that the minimum temperature difference between solution and heat sink does not occur at the absorber inlet, that a desuperheater provides no gain. Even when the minimum temperature difference occurs at the absorber inlet, there is only a small gain and it gets smaller with increasing circulation ratios.Dimensioning the absorber gave some unrealistic results in terms of an extreme ratio between absorber height and width/length. Even with the smallest obtained ratio, the height was 10 times the width, and the required surface area was significantly higher than for larger ratios. It is difficult to determine whether the results are due to errors in the simulation model or if it is difficult to obtain a noteworthy result with the simulation parameters. However, it is worth mentioning that the air mass flow rate was 15 times as high as the mixture mass flow rate. In the spray drying simulation case, the heat pump performance was 1.40 including the fan work. This performance was calculated with no limitation to the discharge temperature and with high water content in the vapour. With more realistic limitations, the performance would have been lower and the required. The required temperature lift in the case may have been somewhat high for the heat pump process.

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Sari, Ozgur Gokmen. "Exergy Analysis Of A Solar Assisted Absorption Heat Pump For Floor Heating System." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12604765/index.pdf.

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Solar assisted single-stage absorption heat pump (AHP) was used to supply energy to a floor-heating system by using the exergy methods. An existing duplex-house,in Ankara, with a heating load of 25.5 kW was analysed. Heating loads of the spaces in the building were calculated and a floor heating panel was modelled for each space leading to the capacity of the AHP before it was designed. Solar energy was delivered to the evaporator and high temperature heat input delivered to the genarator are met by auxiliary units operating with natural gas.The solar energy gained by flat-plate collectors was circulated through AHP.The anaysis performed according to the storage tank temperature reference value if the water temperature leaving the storage tank exceeds a predetermined value it is directly circulated through the floor heating system. Exergue analysis were carried out with Mathcad program. Exergy analysis showed that irreversibility have an impact on absorption system performance.This study indicated which components in the system need to be improved thermally.A design procedure has been applied to a water-lithium-bromide absorption heat pump cycle and an optimisation procedure that consists of determinig the enthalpy, entropy ,exergy, temperature, mass flow rate in each component and coeficient of performance and exergetic coefficient of performance has been performed and tabulated.

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Sarı, Özgür Gökmen. "Energy analysis of a solar assisted absorption heat pump for floor heating system." Ankara : METU, 2004. http://etd.lib.metu.edu.tr/upload/12604765/index.pdf.

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Books on the topic "Absorption heat pump"

1

Grabenhenrich, H. B. Periodically operating absorption heat pump. Luxembourg: Commission of the European Communities, 1985.

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Chaudari, Shrirang Keshav. Performance studies on an absorption heat pump. Salford: University of Salford, 1985.

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3

Reinhard, Radermacher, and American Society of Mechanical Engineers. Advanced Energy Systems Division., eds. Proceedings of the International Absorption Heat Pump Conference: Presented at the International Absorption Heat Pump Conference , New Orleans, Louisiana, January 19-21, 1994. New York, N.Y: American Society of Mechanical Engineers, 1994.

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Paranjape, Dilip Vinayak. A performance study of aqueous salt systems in an absorption heat pump. Salford: University of Salford, 1985.

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O'Donnell, J. P. The performance of an absorption heat pump using an endothermic refrigerant/absorbent system. Luxembourg: Commission of the European Communities, 1985.

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Reinhard, Radermacher, and Klein Sanford A. 1950-, eds. Absorption chillers and heat pumps. Boca Raton, FL: CRC Press, 1996.

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Paris), Absorption Heat Pumps Congress (1985. Absorption Heat Pumps Congress, Paris, 20-22 March 1985. Luxembourg: Commission of the European Communities, 1985.

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Smith, I. E. Design and development of absorption heat pumps. Luxembourg: Commission of the European Communities, 1986.

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Orekhov, I. I. Absorbt͡s︡ionnye preobrazovateli teploty. Moskva: "Khimii͡a︡", 1989.

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Congress on Absorption Heat Pumps (1985 Paris). Absorption Heat Pumps Congress, Paris, 20-22 March 1985. Luxembourg: Commission of the European Communities, 1985.

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Book chapters on the topic "Absorption heat pump"

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Wu, Wei, Xianting Li, and Tian You. "Low Evaporation Temperature Absorption Heat Pump." In Absorption Heating Technologies, 75–108. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0470-9_3.

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Wu, Wei, Xianting Li, and Tian You. "Performance Improvement of Absorption Heat Pump." In Absorption Heating Technologies, 109–45. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0470-9_4.

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Wu, Wei, Xianting Li, and Tian You. "Performance of Ground Source Absorption Heat Pump." In Absorption Heating Technologies, 147–65. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0470-9_5.

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Wu, Wei, Xianting Li, and Tian You. "Hybrid Ground Source Absorption Heat Pump System." In Absorption Heating Technologies, 167–210. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0470-9_6.

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Wu, Wei, Xianting Li, and Tian You. "Advances in Novel Working Fluids for Absorption Heat Pump." In Absorption Heating Technologies, 211–36. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0470-9_7.

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Åhlby, L., and D. Hodgett. "The Compression-Absorption Cycle: A High-Temperature Application." In Applications and Efficiency of Heat Pump Systems, 59–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-662-30179-1_6.

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Ziegler, F., and G. Hämmer. "Experimental Results of a Double-Lift Compression-Absorption Heat Pump." In Applications and Efficiency of Heat Pump Systems, 49–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-662-30179-1_5.

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Bouguelia, A., H. Desmorieux, J. Labidi, and P. Le Goff. "An Open Cycle Absorption Heat Pump: A System for Drying Agricultural Products." In Applications and Efficiency of Heat Pump Systems, 149–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-662-30179-1_14.

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Itaya, Yoshinori. "Thermal Energy Recovery System for Upgrading Waste Heat by an Absorption Heat Pump." In Mediterranean Green Buildings & Renewable Energy, 575–87. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30746-6_43.

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Kaushik, Shubhash C., Sudhir K. Tyagi, and Pramod Kumar. "Finite Time Thermodynamics of Vapour Absorption Airconditioning and Heat Pump Cycles." In Finite Time Thermodynamics of Power and Refrigeration Cycles, 261–83. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62812-7_12.

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Conference papers on the topic "Absorption heat pump"

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Anand, G., C. B. Panchal, and D. C. Erickson. "Secondary Fluids for GAX Absorption Heat Pump." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43289.

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The gas-fired Generator-Absorber heat eXchanger (GAX) heat pump is being considered for space conditioning in residential and light commercial applications. In order to meet the national building codes for ammonia absorption heat pumps, a secondary fluid is used to interface with the air-coils. Proper choice of a secondary fluid maximizes the economic advantage of the GAX heat pump. The secondary fluid transfers the heating and cooling loads from the absorption heat pump to and from outdoor and indoor air-coils. The physical properties of secondary fluids influence the heat transfer performance in the heat-exchange equipment and hence the effective lift, thereby determining the cycle coefficient of performance (COP). Additionally, the pumping power for each fluid varies depending on the density and viscosity at operating temperatures. The variation in cycle COP and pumping power as a result of fluid properties is ultimately manifested as changes in electric and natural-gas cost. An analysis was carried out to evaluate six secondary fluids for a GAX absorption heat pump. A performance model was developed to simulate the secondary-fluid flow loops and the absorption heat pump. The utility costs for heating and cooling were determined for a typical building. The effects of ambient conditions and local utility rates were determined by modeling the annual utility costs in four cities: Atlanta, Chicago, Los Angeles, and New York. These four cities provided wide variations in heating and cooling requirements, and utility rates for natural gas and electricity. The results from this study provide a basis for selecting secondary fluids for heat pumping in different locations.

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2

Drost, Kevin. "Mesoscopic Heat-Actuated Heat Pump Development." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0803.

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Abstract Battelle, Pacific Northwest Division (Battelle) and Pacific Northwest National Laboratory1 (PNNL) are developing a miniature absorption heat pump. Targeted applications include microclimate control ranging from manportable cooling to distributed space conditioning. The miniature absorption heat pump will be sized to provide 350 Wt of cooling2. A complete manportable cooling system, which will include the microscale heat pump, an air-cooled heat exchanger, batteries, and fuel, is estimated to weigh between 4 and 5 kg. For comparison, alternative systems weigh about 10 kg. Size and weight reductions in the microscale heat pump are possible because the device can take advantage of the high heat and mass transfer rates attainable in microscale structures.

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3

Andersen, Jens Møller. "Heat Integration of Absorption Heat Pump in a Milk Powder Dairy." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1293.

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Abstract Heat integration with absorption heat pumps requires investigation of many types of plant designs. In this article, it is concluded that in many cases high temperature absorption systems for heat recovery are more economically feasible than absorption systems for cooling purposes. The conclusion is based on a project where the scope was to investigate technical and economical possibilities for heat integration of an absorption heat pump in a milk powder plant. The first idea behind the project was to use the waste heat from the rejected air to drive an absorption cooling system to reduce the electricity consumption for cooling proposes. The model of the plant was based on simulations as a background for a time averaged COP model. It was concluded that an absorption system for generating low temperature steam is more feasible.

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4

Vinther, Kasper, Rene J. Nielsen, Kirsten M. Nielsen, Palle Andersen, Tom S. Pedersen, and Jan D. Bendtsen. "Absorption cycle heat pump model for control design." In 2015 European Control Conference (ECC). IEEE, 2015. http://dx.doi.org/10.1109/ecc.2015.7330870.

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5

Garimella, Srinivas. "Absorption Heat Pump Performance Improvement Through Ground Coupling." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-1005.

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Abstract The present study investigates the improvement in the performance of an absorption heat pump for residential space-conditioning due to the use of the ground as the heat source in the heating mode and the heat sink in the cooling mode. A baseline air-coupled single-effect ammonia-water heat pump is first designed to deliver 10.55 kW (36,000 Btu/hr) of cooling load at the ARI rating conditions. Particular attention is paid to incorporating many realistic details of an operating system such as fuel combustion efficiencies of the burner, non-equilibrium conditions, and moist air processes in the air-coupled heat exchangers. A range of parametric studies is also conducted to investigate the variation in performance of this system with ambient conditions in the heating and cooling modes. The same system is then analyzed in a ground-coupled configuration. The instantaneous COP for the ground-coupled system is compared with the COP of the air-coupled system as a function of the time of the year and the corresponding variations in ambient and ground temperatures using thirty-year average climate data for various locations from the National Weather Service. Improvements in COP of up to twenty percent over the air-coupled system values (cooling mode COP of 0.495 at 35°C (95°F) and heating mode COP of 1.20 at 8.33°C (47°F)) are demonstrated in diverse geographic locations with widely varying heating and cooling loads. These improvements indicate that an efficient ground-coupled heat pump could be developed for residential space-conditioning applications using simple thermodynamic cycles and existing technology for the heat and mass exchange components.

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Sun, Jian, Lin Fu, and Shigang Zhang. "A Microcosmic Absorption Model for Absorber in Solar Driven Absorption Heat Pump." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37349.

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The absorption heat pump has currently become an important device in saving energy because of its effectiveness in utilizing low grade heat. A microcosmic absorption model was established for the horizontal falling film absorber. The Nusselt solution for film thickness and velocity distribution was applied and the mass and energy conservation were used to build the heat and mass transfer equations. Besides, heat and mass transfer equations were joined by reciprocity of each other. A complete absorption model was given. In order to justify this model, the largest absorption system experiment bench in China was built. The calculated results were compared to experimental values and showed satisfying agreement. This model will play an important role in absorption system design and relative researches.

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7

Wei, Fan, Yunhan Xiao, and Shijie Zhang. "Integration Design and Performance Analysis of HAT Cycle Incorporated With Absorption Heat Pump." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27508.

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The humid air turbine (HAT) cycle is a novel advanced gas turbine cycle. However, the conventional HAT cycle has many insufficiencies considering combined heat and power generation, water recovery and exhausts emission with low temperature. This study deals with these problems by integrating absorption heat pumps into the HAT cycle. Six types of absorption heat pumps, including the single stage open cycle absorption heat transformer (connect to the HAT cycle with simple and complex manner respectively), the two stage open cycle absorption heat transformer, the open cycle absorption heat pump with the single pressure, the closed cycle two stage absorption heat transformer and the closed cycle absorption heat pump, are incorporated into the HAT cycle. The integrated systems are simulated. The results indicate that while the electrical efficiency of the original HAT cycle is 56.48%, the cycle efficiencies of the above-mentioned integrated cycles are 50.53%, 55.15%, 51.07%, 46.88%, 57.52% and 46.25%, respectively. Water recovery can be achieved in each integrated system although the recovery effects are quite different. For the open systems, the water recovery levels depend on the pressure difference of the gas and the water. Full water recovery can be realized and the temperature of the exhaust gas can be kept high. The water recovery levels of the closed systems relate to the thermal capacity of the exhaust gas, and the emission of the low temperature exhaust gas is difficult. From the point of view of the combined heat and power generation, the temperature of the exhaust gas does not influence the quantity of the heat supply. Three integrated systems can be applied for the combined heat and power generation, the heat and power efficiency are 62.85%, 76.77% and 63.83% respectively. In general, the advantages of the HAT cycle combined with the absorption heat pump system are verified in the present paper.

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8

Nogues, M., M. Valles, M. Bourouis, D. Boer, and A. Coronas. "Absorption-Compression Heat Pump for Space Heating and Cooling Using Organic Fluids." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1290.

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Abstract The combination of compression and absorption technologies can provide heat pumps with high efficiency and a wide operating range. The aim of this research project lies in the development and testing of a gas-fired double effect absorption-compression heat pump working with organic pairs for space heating and cooling. For these applications, the use of suitable organic working pairs makes possible heat pump operation at higher temperature lifts than that of conventional water-lithium bromide systems. In our research, the combination Methanol and Tetraethylenglycoldimethylether (TEGDME) has been selected as working pair. The heat pump is targeted to operate in both cooling and heating modes. Therefore, the basic structure of the heat pump is an absorption-compression double effect cycle for cooling mode, that can be switched to a single effect cycle, in order to achieve the required higher temperature lift for the heating operation. The nominal working conditions for cooling are 5°C at the evaporator and 35 to 45°C at me absorber-condenser. These conditions can be achieved with a double effect absorption-compression cycle. Different solution circuit flow configurations as serial, parallel and reverse flow have been considered. The heating operation of the heat pump aims at a temperature of the useful delivered heat between 45 and 60°C for an evaporator temperature of 0°C. In order to achieve the required temperature lift with an attractive performance (COP in the heating mode higher than unity), the unit should operate as a single effect absorption-compression heat pump. The performance analysis was based on a thermodynamic model considering the equilibrium properties of the working pair and energy and mass balances in the different components. Results in both operating modes have been evaluated in terms of the solution flow rate, the coefficient of performance COP and the primary energy ratio PER. Very interesting performances are found even for high temperature lifts. The serial flow configuration has been selected due to its good performance and technological aspects. This work forms part of the project CLIMABGAS. A prototype of this heat pump is under construction for a cooling power of 20 kW and a heating power of 24.5 kW.

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9

Wang, Liyuan, Ming Liu, Yue Fu, Jiping Liu, and Junjie Yan. "Thermodynamic Analysis on a Heat-Power Decoupling System Integrated With Absorption Heat Pump." In ASME 2020 Power Conference collocated with the 2020 International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/power2020-16309.

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Abstract Because of the continuous expanding of the district heating, the heating load of combined heat and power (CHP) plants increases year by year. The minimum power load of CHP plant increases with the heating load due to the heat-power coupling mechanism. Therefore, heat-power decoupling is necessary to improve the operation flexibility for CHP units. Integrating the absorption heat pump (AHP) is an effective method to realize the heat-power decoupling. In this study, a 330MW CHP unit model and AHP model have been developed and validated. The performance of the heat-power decoupling and energy saving performance has been investigated by comparing the thermodynamic performance indicators. Results show that, the proposed system can increase the maximum heating load and decrease the power generation when the primary network return temperature is decreased. When the heating steam extraction is kept constant, with the increase of the primary network return water temperature, the heat generation efficiency and the standard coal consumption rate of heating increases, the coal consumption rate of power generation and the heating efficiency decreases. And the primary network return water temperature increases from 40 °C to 70 °C, the coal consumption rate of power generation decreases by 4.3 g/kWh, and the coal consumption rate of heating increases by 0.67 kg/GJ.

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10

Hu, Peng, Lin Fu, Shigang Zhang, Yong Luo, and Changlei Xiao. "Study on a Newly Absorption Heat Pump District Heating System." In ASME 2009 3rd International Conference on Energy Sustainability collocated with the Heat Transfer and InterPACK09 Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/es2009-90064.

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Combined heat and power (CHP) has higher efficiency than other heating supply methods. However, the total heating supply capacity from CHP plants will soon be lower than the total heating demand in Beijing by 2010. Investigation showed that 10% to 20% of total energy consumption was rejected to the surroundings through cooling water in CHP plants. The cooling water temperature leaving the condenser is normally in the range of 20–35°C during the heating season. This temperature is too low to be used for heating purpose. The total quantity of rejected heat is roughly equivalent to the energy to condition (heating) 25 million m2 building areas. Although circulating water in power plants has many advantages compared with other HP heat sources commonly used, it’s nearly impossible to operate a pipe network with such a small ΔT (10∼15°C) economically. A newly solution based on absorption heat pump (HP) was investigated and a smallscale demonstration project was built in Chifeng, a city of Inner Mongolia in North China. In such a newly district heating (DH) System, the primary pipe network will operate in ΔT of ≈100°C without any change in both outlet temperature of CHP sources and operating temperature of secondary pipe network. Inlet temperature of primary pipe network decreased to 20∼25°C, which makes possibility for waste heat recovery of circulating cooling water in most CHP plants. Comprehensive efficiency in CHP plants will improve 10% ∼ 20% theoretically. Operation effect during whole heating season of the demonstration project was also introduced.

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Reports on the topic "Absorption heat pump"

1

Bamberger, J., and F. Zaloudek. Rotary absorption heat pump sensitivity analysis. Office of Scientific and Technical Information (OSTI), March 1990. http://dx.doi.org/10.2172/6966976.

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2

Holcomb, Don. Development of an Ionic-Liquid Absorption Heat Pump. Office of Scientific and Technical Information (OSTI), March 2011. http://dx.doi.org/10.2172/1009964.

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3

Bamberger, J., and F. Zaloudek. Rotary absorption heat pump sensitivity analysis final report. Office of Scientific and Technical Information (OSTI), October 1989. http://dx.doi.org/10.2172/5453079.

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4

Geoghegan, Patrick, Moonis Ally, and Vishaldeep Sharma. Commercial Absorption Heat Pump Water Heater: Beta Prototype Evaluation. Office of Scientific and Technical Information (OSTI), October 2016. http://dx.doi.org/10.2172/1376355.

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5

Perez-Blanco, H., M. R. Patterson, and J. Braunstein. Ideal fluid properties for optimizing absorption heat pump performance. Office of Scientific and Technical Information (OSTI), April 1987. http://dx.doi.org/10.2172/6611058.

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6

Garrabrant, Michael, and Christopher Keinath. Pre-Commercial Scale-Up of a Gas-Fired Absorption Heat Pump. Office of Scientific and Technical Information (OSTI), June 2020. http://dx.doi.org/10.2172/1726247.

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7

Garrabrant, Michael, and Christopher Keinath. Pre-Commercial Scale-Up of a Gas-Fired Absorption Heat Pump. Office of Scientific and Technical Information (OSTI), June 2020. http://dx.doi.org/10.2172/1726247.

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8

Zaltash, A., and M. R. Ally. Validation of a PC based program for single stage absorption heat pump. Office of Scientific and Technical Information (OSTI), September 1991. http://dx.doi.org/10.2172/6071783.

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9

Zaltash, A., and M. R. Ally. Validation of a PC based program for single stage absorption heat pump. Final report. Office of Scientific and Technical Information (OSTI), September 1991. http://dx.doi.org/10.2172/10107393.

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10

Ally, M. R. Computer simulation of absorption heat pump using aqueous lithium bromide and ternary nitrate mixtures. Office of Scientific and Technical Information (OSTI), June 1988. http://dx.doi.org/10.2172/6955013.

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