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Isobaric Expansion Engines Powered by Low‐Grade Heat—Working Fluid Performance and Selection Database for Power and Thermomechanical Refrigeration
Energy Technology ( IF 3.6 ) Pub Date : 2020-09-18 , DOI: 10.1002/ente.202000613 Ahmad K. Sleiti 1
Energy Technology ( IF 3.6 ) Pub Date : 2020-09-18 , DOI: 10.1002/ente.202000613 Ahmad K. Sleiti 1
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A database is developed for the most suitable working fluids for Worthington‐type and Bush‐type isobaric engines based on their performances for a wide range of heat source temperature, from 40 to 300 °C, and operating pressures from 1 to 100 bar. Thermodynamics models are developed and simulated to study the effects of different operating temperatures and pressures on the efficiency and back work ratio of both engines. Results show that in temperature range from 40 to 60 °C, the achieved efficiency is less than 4% for most cases, suggesting that practical applications in this range are very limited. Ammonia and R32 show the highest efficiencies (≈11%) at high pressure of 50 bar for the temperature range of 100–300 °C. The refrigerant R161 has high performance for pressures between 10 and 50 bar for the full range of temperatures from 80 to 300 °C, which makes R161 the choice fluid for a wide range of applications. Novel applications are introduced, which integrate these isobaric engines with vapor compression refrigeration systems. The thermodynamic cycles of the heat driven compressor with the selected working fluids as in the current study and the simplified technological solutions are crucial components of the study novelty.
中文翻译：
低品位热量驱动的等压膨胀发动机-动力和热机械制冷的工作流体性能和选择数据库
根据Worthington型和Bush型等压发动机的最广泛的热源温度范围（从40到300°C，工作压力为1到100 bar）的性能，为最合适的工作流体开发了一个数据库。开发并模拟了热力学模型，以研究不同工作温度和压力对两台发动机的效率和后功比的影响。结果表明，在40至60°C的温度范围内，大多数情况下达到的效率不到4％，这表明该范围内的实际应用非常有限。在100-300°C的温度范围内，氨和R32在50 bar的高压下显示出最高的效率（≈11％）。R161制冷剂在80至300°C的整个温度范围内，在10至50 bar的压力下均具有高性能，这使得R161成为广泛应用中的首选流体。引入了新颖的应用，将这些等压发动机与蒸汽压缩制冷系统集成在一起。如当前研究中所选择的工作流体与热驱动压缩机的热力学循环以及简化的技术解决方案是研究新颖性的关键组成部分。
更新日期：2020-11-06
中文翻译：
低品位热量驱动的等压膨胀发动机-动力和热机械制冷的工作流体性能和选择数据库
根据Worthington型和Bush型等压发动机的最广泛的热源温度范围（从40到300°C，工作压力为1到100 bar）的性能，为最合适的工作流体开发了一个数据库。开发并模拟了热力学模型，以研究不同工作温度和压力对两台发动机的效率和后功比的影响。结果表明，在40至60°C的温度范围内，大多数情况下达到的效率不到4％，这表明该范围内的实际应用非常有限。在100-300°C的温度范围内，氨和R32在50 bar的高压下显示出最高的效率（≈11％）。R161制冷剂在80至300°C的整个温度范围内，在10至50 bar的压力下均具有高性能，这使得R161成为广泛应用中的首选流体。引入了新颖的应用，将这些等压发动机与蒸汽压缩制冷系统集成在一起。如当前研究中所选择的工作流体与热驱动压缩机的热力学循环以及简化的技术解决方案是研究新颖性的关键组成部分。
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