摘要
分析了影响分布式能源大温差供冷系统能耗的关键因素,分别研究了大温差供冷对冷水机组蒸发温度、性能系数及配套末端设备性能的影响,计算得出大温差供冷系统在供/回水温差增加、供水温度降低时冷水机组蒸发温度降低、能耗增加,配套冷冻水泵能耗大幅降低的变化关系。阐明大温差供冷系统在降低整体能耗的同时,必须考虑到冷水机组、风机盘管正常工作的工况要求,通过降低供冷温度、增设盘管数、增设防冻措施等方式保证系统正常运行。结合实际项目应用(冷负荷130 MW,共15台大温差电制冷设备:3台串联溴化锂的离心式冷水机组,单台制冷量8600 kW;9台7384 kW制冷量和3台2813 kW制冷量的大温差离心式冷水机组)计算论证了大温差制冷系统(3/13℃)的运行节能性,对比常规制冷系统(7/12℃)年节约能耗约为1.75 GW·h,为后续同类项目提供参考。
In the analysis on the key factors affecting energy consumption of large temperature difference cooling systems powered by distributed energy,the effects of large temperature difference cooling on the evaporating temperature,COP(Coefficient of Performance)and auxiliary terminal equipment of chillers are studied.According to the calculation results,with the expansion of the temperature difference between supply and return and the drop of supply water temperature in a large temperature difference cooling system,the evaporating temperature of the chiller will decrease and the chiller's energy consumption will increase,but the energy consumption of the chilled water pumps will fall significantly.The energy consumption reduction realized by the large temperature difference cooling system has to be calculated on the premise of ensuring the operation of the chillers and fan coil units.This normal operation can be realized by lowering the cooling supply temperature,increasing the number of coils and adding anti-freezing measures.There is an actual project installed 15 large temperature difference chillers with 130 MW cooling load.The 15 refrigeration devices include three sets of 8600 kW centrifugal chillers in series with lithium bromide units,nine sets of 7384 kW centrifugal chillers and three sets of 2813 kW centrifugal chillers.Compared with the conventional refrigeration system(7/12℃),the energy saved annually by the large temperature difference refrigeration system(3/13℃)grows by about 1.75 GW·h.This analysis provides a reference for subsequent similar projects.
作者
魏汝华
王一枫
WEI Ruhua;WANG Yifeng(Guangzhou HEMC Huadian New Energy Company Limited,Guangzhou 511400,China;China Huadian Engineering Company Limited,Beijing 100070,China)
出处
《华电技术》
CAS
2021年第10期80-85,共6页
HUADIAN TECHNOLOGY
基金
中国华电集团科技项目(CHDKJ20-01-75)。
关键词
分布式能源
大温差供冷系统
冷水机组
供/回水温差
蒸发温度
distributed energy
large temperature difference cooling system
chiller
temperature difference between supply and return water
evaporating temperature
