二元混合工质MB85中高温热泵的性能

Performance of Binary Mixture Working Fluid of MB85 for Moderate and High Temperature Heat Pump

对理论循环性能优良、样品可得的二元混合工质MB85和纯质HFC245fa,在冷凝温度70～100,℃、蒸发温度40～55,℃的工况范围内进行了循环性能对比实验研究.该实验采用指定工质侧温度的循环性能对比实验评价研究方法,在水-水蒸气压缩式热泵实验台上进行.混合工质MB85的臭氧破坏潜能(ODP)为0,全球变暖潜能(GWP)较低.研究结果表明,与在冷凝温度70～100,℃工况范围内实验性能较优的纯质HFC245fa相比,MB85的制热量和性能系数(COP)均明显高于HFC245fa,排气温度比HFC245fa高3,℃左右,综合性能优于HFC245fa;在冷凝温度为100,℃,循环温升为45,℃时COP为3.83,热水输出温度为97.2,℃.

The performance of binary mixture working fluid of MB85 and pure fluid HFC245fa was experimentally investigated within the condensing temperature range of 70 to 100 ℃, and the evaporating temperature range of 40 to 55 ℃. The experimental investigation was carried out with a real-sized water-to-water vapor compression heat pump employing the approach of controlling the temperature of refrigerant for comparative evaluation of experimental performance of working fluids. The mixture working fluid of MB85 has zero ozone depletion potential （ODP） and low global warming potential （GWP）. Results show that MB85 offers high heating capacities and coefficient of performance （COP）, and its discharge temperature is 3 ℃ higher than that of HFC245fa ever regarded as a suitable working fluid within the condensing temperature range of 70 ℃ to 100 ℃. The comprehensive performance of MB85 is better than that of HFC245fa. When the condensing temperature is 100 ℃ and the circular temperature is 45 ℃, the COP of the binary mixture working fluid is 3.83 and the outlet water temperature of condenser is 97.2 ℃.