不同环境温度下复叠式空气源热泵高温热水系统运行特性研究

基于空气源热泵热水机组长时间低温运行会出现压缩比过高的问题,研究了复叠式空气源热泵在不同环境温度下制取高温热水的可行性、运行特性及节能性。实验结果表明,随着室外环境温度的升高,系统制取高温热水的能效系数升高,高温级压缩机的吸排气温度略有升高,低温级压缩机的排气温度呈现升高趋势,高温级压缩机的吸排气压力基本保持不变;随着出水温度的升高,系统的耗功率增大,COP降低。

高温热水锅炉供热系统在虹桥国际机场的应用和完善

通过虹桥国际机场扩建工程西区能源中心对大体量高温热水供热系统的案例,从项目的设计、建设和运行各阶段全面地介绍该种供热方式的实际应用。针对初次应用该系统而引发的一些问题,提出改进、完善,希望以此推动高温热水供热系统在上海地区更好、更广泛地应用。

硫化机热水循环泵更新及供应系统分析

对高温热水供应系统进行了分析，根据蒸汽供应的实际情况，对原来的蒸汽参数进行了调整，并更换了热水循环泵，从而提高了高温热水供应系统的可靠性。

Experimental Performance of Moderate and High Temperature Heat Pump Charged with Refrigerant Mixture BY-3

Theoretical and experimental analysis of a new refrigerant mixture BY-3 was conducted based on a single-stage vapor compression refrigeration system. The water-water heat pump system used BY-3 to produce hot water when the low temperature was 20 ℃. The following results were obtained: the highest temperature at the condenser outlet reached about 85 ℃; when the difference between the water temperatures at the condenser outlet and the evaporator inlet was less than 40 ℃, the coefficient of performance (COP) was larger than 4; when the difference reached 55 ℃, the COP still kept 3; the discharge temperature of BY-3 was lower than 100 ℃, and the refrigerant vapor pressure kept lower than 1.8 MPa. When the water temperature at the condenser outlet reached over 85 ℃, nearly a 5 ℃ superheating temperature was maintained.