变频技术在污水源热泵系统中的应用研究

Research on the application of the frequency conversion technology on the sewage source heat pump system

在污水源热泵供暖空调系统中,热泵机组大部分时间都是处于部分负荷运行中,而污水泵和中介水泵却一直处于满负荷运行,不能随着热泵机组负荷的变化而进行调节,结果造成了系统耗电量的大量增加。为了减少污水源热泵系统中水泵的耗电量,节省运行费用,采用理论分析和实验测量的方法,确定北京某宾馆污水源热泵系统冷热源部分水泵的变频范围和变频前后整个夏季制冷期的耗电量,研究水泵变频调速供水的节能效果和经济性。研究表明,系统冷热源部分水泵采用变频调速技术后,整个夏季供冷期节省电量65 136 kWh,节省运行费用5.6万元。在污水源热泵供暖空调系统中,水泵采用变频调速技术,可明显地节省运行费用,带来显著的经济效益。

In the system of sewage source heat pump, the heat pump units mostly have been running with partial work load, the sewage pumps and the medi-water pumps have been running at full capacity all the time, and can not be adjusted with load change of the heat pump units, as a result, the electricity cost increases in a large amount. In order to reduce power consumption of the pumps and save the operation cost of the sewage source heat pump system, this paper introduces the theoretical analysis and experimental measuring methods to determine the frenquency conversion range of the heat and cool source pump, and determine the power consumption in the whole summer of the system of a hotel in Beijing. The studies have shown that the pumps of heat and cool source parts of the sewage source heat pump system has reduced its power consumption of 65 136 kWh, at the same time, 56 thousand yuan of operating cost has been saved after frequency conversion has been adopted in the whole sunmmer for cooling. The paper points out that the pumps adopts frequency conversion technology in the system of the sewage source heat pump can decrease the operating cost obviously and bring about the remarkable economic benefits.