Transcritical carbon dioxide microchannel heat pump water heaters: Part II – System simulation and optimization
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Transcritical Carbon Dioxide Microchannel Heat Pump Water Heaters: Part II - System Simulation and Optimization
This paper presents the development of a transcritical CO2 heat pump water heating system model incorporating analytical heat exchanger models and an empirical compressor model. This study investigated the effects of a suction line heat exchanger (SLHX) and once-through versus multi-pass water heating schemes. The once-through systems outperformed the multi-pass systems by 10% for the system wi...
متن کاملTranscritical Carbon Dioxide Microchannel Heat Pump Water Heaters: Part I - Validated Component Simulation Modules
An experimental and analytical study on the performance of carbon dioxide heat pumps for water heating was conducted. The performance of compact, microchannel, water-coupled gas coolers, evaporator, and suction line heat exchanger (SLHX) were evaluated in an experimental facility. Analytical heat exchanger models accounting for the flow orientation and changing CO2 thermophysical properties wer...
متن کاملTranscritical carbon dioxide heat pump systems: A review
Carbon dioxide is a safe, economic and environmentally sustainable refrigerantwhich can be used in heat pump and refrigeration systems. Research into the performance and benefits of a transcritical heat pump cycle using carbon dioxide began in the early 1990s. Theoretical and experimental research, as well as commercial system development, has improved transcritical system performance to a leve...
متن کاملTransient Simulation of a Transcritical Carbon Dioxide Refrigeration System
Transient simulations of refrigeration cycles are crucial for evaluating new refrigerants. Previously developed transient simulation tool was capable of simulating refrigeration systems using refrigerants R22 and R134a and was validated with experimental data; however, incorporating non-traditional refrigerants such as R744 (carbon dioxide) change the cycle operation beyond the capabilities of ...
متن کاملPerformance of a Transcritical CO2 Heat Pump for Simultaneous Water Cooling and Heating
This paper presents the experimental as well as the simulated performance studies on the transcritical CO2 heat pumps for simultaneous water cooling and heating; effects of water mass flow rates and water inlet temperatures of both evaporator and gas cooler on the cooling and heating capacities, system COP and water outlets temperatures are investigated. Study shows that both the water mass flo...
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ژورنال
عنوان ژورنال: International Journal of Refrigeration
سال: 2011
ISSN: 0140-7007
DOI: 10.1016/j.ijrefrig.2010.12.001