区域供冷系统外管网冷水有效输送能耗分析
Analysis of effective energy consumption of chilled water transportation of external pipe network in district cooling systems
摘要：
对区域供冷系统外管网和制冷站的边界作了清晰划分,对外管网有效功率和二级泵功耗作了比较。提出了管网冷水有效输送能耗对区域供冷系统能效影响的分析方法,根据前海区域供冷2号站实际运行数据,按照不同时间尺度(年、月、小时)对管网冷水有效输送能耗对系统能效的影响进行了分析。结果表明,在满用户入住率时,管网的功耗冷热比约为0.007,对于制冷机COPR为5的区域供冷系统,管网冷量输送能耗对系统COPDCS的影响率为-4.2%。区域供冷系统冷量输送过程可能包括乙二醇泵、融冰泵、冷水一级泵、冷水二级泵等设备,其对系统COP的影响有同等作用,降低站内冷量输送能耗对提升系统能效有较大潜力。
Abstract：
The boundary between the external pipe network and the chiller plant of the district cooling system (DCS) is clearly defined, and the effective power consumption of the external pipe network and the power consumption of the secondary pumps are compared. An analysis method is developed for evaluating the effects of energy consumption of chilled water transportation in pipe network of DCS. Based on the actual operating data of Qianhai DCS Plant 2, the impact of energy consumption of chilled water transportation in pipe network of DCS energy efficiency is analysed according to different time scales (year, month, hour). The results show that at full occupancy rate, the power consumption to heat supply ratio of the pipe network is approximately 0.007. For a DCS with a chiller’s COPRof 5, the impact of energy consumption of chilled water transportation in pipe network on the system COPDCSis -4.2%. The cooling energy process in a DCS may be transported by equipment such as ethylene glycol pumps, ice melting pumps, primary chilled water pumps, and secondary chilled water pumps, all of which have an equal impact on the system energy efficiency. Reducing the energy consumption of cooling energy transportation within the chiller plant holds significant potential for improving the system’s energy efficiency.
Keywords:district cooling system; energy consumption of effective transportation; pipe network; system energy efficiency; power consumption to heat supply ratio