The exergy analysis and finite time thermodynamic methods had been employed to analyze the compound condensation process (CCP). It was based on the air-cooling heat pump unit. The cooling capacity of the chiller unit ...The exergy analysis and finite time thermodynamic methods had been employed to analyze the compound condensation process (CCP). It was based on the air-cooling heat pump unit. The cooling capacity of the chiller unit is about 1 kW, and the work refrigerant is R22/R407C/R410A/CO2. The MATLAB/SIMULINK software was employed to build the simulation model. The thermodynamic simulation model is significant for the optimization of parameters of the unit, such as condensation and evaporation temperature and mass flow of the sanitary hot water and size of hot water storage tank. The COP of the CCP of R410A system is about 3% - 5% higher than the CCP of the R22 system, while CCP of the R407C system is a little lower than the CCP of R22 system. And the CCP of CO2 trans-critical system has advantage in the hot supply mode. The simulation method provided a theoretical reference for developing the production of CCP with substitute refrigerant R407C/R410A/CO2.展开更多
文章提出了一种利用高温热泵回收冷却水余热制备中、高温热水的方案。通过建立简化的热力学模型,分析冷、热源温度对热泵单位制热量、单位压缩功及COP(Coefficient of Performance,能效比)值的影响。并从经济节能和环境保护两个方面进...文章提出了一种利用高温热泵回收冷却水余热制备中、高温热水的方案。通过建立简化的热力学模型,分析冷、热源温度对热泵单位制热量、单位压缩功及COP(Coefficient of Performance,能效比)值的影响。并从经济节能和环境保护两个方面进行了效益分析,结果表明:与传统的蒸汽加热制备热水相比,高温热泵回收冷却水余热制备中、高温热水的方案具有经济效益和环境效益,更符合节能减排要求。展开更多
直膨式太阳能光伏光热(photovoltaic-thermal,PVT)热泵是一种综合利用太阳能资源的新型高效技术。为探究不同环境条件以及系统配置方式对直膨式太阳能PVT热泵热水系统运行性能的影响,基于能量平衡原理在Matlab平台上建立了系统的仿真模...直膨式太阳能光伏光热(photovoltaic-thermal,PVT)热泵是一种综合利用太阳能资源的新型高效技术。为探究不同环境条件以及系统配置方式对直膨式太阳能PVT热泵热水系统运行性能的影响,基于能量平衡原理在Matlab平台上建立了系统的仿真模型,基于临港地区的环境数据,分析了各季节典型日下不同配置系统的热水供应性能以及发电增益的全年波动情况。结果表明,随压缩机理论输气量的减小,热水系统的性能系数(coefficient of performance,COP)有所提高,但所需的加热时间增加,系统的全年发电增益随理论输气量的减小而减小。展开更多
文摘The exergy analysis and finite time thermodynamic methods had been employed to analyze the compound condensation process (CCP). It was based on the air-cooling heat pump unit. The cooling capacity of the chiller unit is about 1 kW, and the work refrigerant is R22/R407C/R410A/CO2. The MATLAB/SIMULINK software was employed to build the simulation model. The thermodynamic simulation model is significant for the optimization of parameters of the unit, such as condensation and evaporation temperature and mass flow of the sanitary hot water and size of hot water storage tank. The COP of the CCP of R410A system is about 3% - 5% higher than the CCP of the R22 system, while CCP of the R407C system is a little lower than the CCP of R22 system. And the CCP of CO2 trans-critical system has advantage in the hot supply mode. The simulation method provided a theoretical reference for developing the production of CCP with substitute refrigerant R407C/R410A/CO2.
文摘文章提出了一种利用高温热泵回收冷却水余热制备中、高温热水的方案。通过建立简化的热力学模型,分析冷、热源温度对热泵单位制热量、单位压缩功及COP(Coefficient of Performance,能效比)值的影响。并从经济节能和环境保护两个方面进行了效益分析,结果表明:与传统的蒸汽加热制备热水相比,高温热泵回收冷却水余热制备中、高温热水的方案具有经济效益和环境效益,更符合节能减排要求。
文摘直膨式太阳能光伏光热(photovoltaic-thermal,PVT)热泵是一种综合利用太阳能资源的新型高效技术。为探究不同环境条件以及系统配置方式对直膨式太阳能PVT热泵热水系统运行性能的影响,基于能量平衡原理在Matlab平台上建立了系统的仿真模型,基于临港地区的环境数据,分析了各季节典型日下不同配置系统的热水供应性能以及发电增益的全年波动情况。结果表明,随压缩机理论输气量的减小,热水系统的性能系数(coefficient of performance,COP)有所提高,但所需的加热时间增加,系统的全年发电增益随理论输气量的减小而减小。