| Dongjiang Lake data center uses natural cold source to realize free cooling throughout the year,with an average PUE of 1.18,but the waste heat discharged into the lake every year is not effectively utilized.Reasonable waste heat utilization technology can further improve the energy utilization efficiency of the data center on the basis of natural cold source cooling.This paper refers to the principle of the fifth generation ultra-low temperature district heating network,uses a certain amount of high-grade energy through the heat pump,introduces the waste heat of the data center into the hotel domestic hot water supply system for recycling,and establishes the simulation platform of the waste heat recovery system of the data center through TRNSYS software,so as to evaluate the comprehensive benefits brought by this waste heat recovery method to Dongjiang Lake data center park.Firstly,according to the correlation of server thermal dynamic characteristics,the cooling load calculation module of the data center is written in C language in TRNSYS software,which is the basis of the simulation platform of the data center waste heat recovery system.Then,according to the actual situation of the lake water source natural cooling system of Dongjiang Lake Data Center and the control equations of each equipment,the modeling logic of the data center lake natural cooling model and waste heat recovery model is improved.Finally,the simulation platform of waste heat recovery system is established.The simulation results show that the cooling load of the data center is about 2400～3600kw.When the simulation time step is 0.1h,the simulation platform can stably control the hot water supply temperature to 55～60℃.Secondly,the change of outlet temperature of chilled water side of heat exchanger is output by using TRNSYS simulation platform.The simulation results show that the outlet temperature of the chilled water side of the heat exchanger is always lower than the set value of the chilled water supply temperature(17℃),which meets the operating conditions of natural cooling throughout the year.The control error of the air supply temperature is about-3～1℃,and there is a certain overcooling phenomenon,which verifies the reliability of the natural cooling source of Dongjiang Lake data center.The simulation result of the annual average PUE of the data center is 1.16,which is close to the measured result.Finally,according to the annual energy consumption results output by TRNSYS simulation platform,the energy consumption performance,economic performance and carbon emission performance of the waste heat recovery system of the lake water source data center are comprehensively analyzed.The simulation results show that the hotel assumed in this paper can use about 13%of the total waste heat discharged into the lake by the data center through the data center waste heat recovery system,which can save 3.66×10~6k W·h power consumption and 5.48×10~5m3Natural gas consumption compared with the hot water supply system using electric boiler and gas boiler,and the ERE of the data center is close to 1 when the heat pump is turned on,which has a good energy-saving effect.Through the economic analysis,it is found that the investment payback period of establishing the waste heat recovery system of the data center is about 4 years.Under the condition of appropriately increasing the heating charge,the NPV can be greater than 0 in the first year of operation,and can save more energy consumption compared with electric boiler and gas boiler.Compared with the traditional heating solutions of electric boilers and gas boilers,the data center waste heat recovery system can reduce carbon dioxide emissions by 1.39×10~6kg and 4.65×10~5kg per year,respectively.Overall,the data center waste heat recovery system can bring better comprehensive benefits to the data center park. |
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