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
基于分布式能量系统的双源可逆型空调系统作为一个独立运行的冷热供应系统,不仅有分布式系统的优点,而且产品单一可避免电上网的问题。对内燃机联产双源系统进行了深入的分析,由敏感性分析结果可知,热泵的循环性能系数(coefficient of p...基于分布式能量系统的双源可逆型空调系统作为一个独立运行的冷热供应系统,不仅有分布式系统的优点,而且产品单一可避免电上网的问题。对内燃机联产双源系统进行了深入的分析,由敏感性分析结果可知,热泵的循环性能系数(coefficient of performance,COP)和发电效率对双源系统性能影响很大。根据典型内燃机变工况的计算方法和对热泵考虑输入功率的影响,以及对余热型溴化锂机组考虑余热温度的影响,得出双源系统的变工况特性,与其它供热/冷系统比较可知,双源系统的供能能力比土壤源热泵机组和直燃型溴化锂机组要优越;因此,认为内燃机联产双源系统有很大节能潜力,值得推广。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.
文摘基于分布式能量系统的双源可逆型空调系统作为一个独立运行的冷热供应系统,不仅有分布式系统的优点,而且产品单一可避免电上网的问题。对内燃机联产双源系统进行了深入的分析,由敏感性分析结果可知,热泵的循环性能系数(coefficient of performance,COP)和发电效率对双源系统性能影响很大。根据典型内燃机变工况的计算方法和对热泵考虑输入功率的影响,以及对余热型溴化锂机组考虑余热温度的影响,得出双源系统的变工况特性,与其它供热/冷系统比较可知,双源系统的供能能力比土壤源热泵机组和直燃型溴化锂机组要优越;因此,认为内燃机联产双源系统有很大节能潜力,值得推广。
