Analysis of a heat pump using wastewater as a heat source to generate hot water
In this study,a heat pump using lukewarm wastewater,around 30°C,as heat source is designed to generate hot water at 60°C in industrial processes.This study is performed to investigate the feasibility of the concept and to optimize the global performance of the process.The wastewater,recovered from an industrial process,is stored in a tank at atmospheric pressure in order to store energy for later use.Otherwise,the hot water is produced instantaneously by the heat pump and stored in a tank pressurized by air.The system is designed to operate during off-peak electricity time to achieve the heat storage process for two reasons: the first is to reduce the operation costs,and the second is to limit CO2 emissions due to higher CO2 content during the peak-hour power generation.A pinch method has been performed to optimize the process performance.The entropy generation in the heat pump is reduced by using an optimal refrigerant mixture as working fluid and by installing a static heat exchanger upstream the evaporator.Furthermore,a new concept of hot water storage is designed to avoid the mixture of hot and cold water in the tank and so reducing the entropy generation of the hot water distribution.As a result of this study,the annual mean COP of the system,to generate hot water at 60°C,is about 6.3 when the wastewater temperature is around 30°C.
Efficiency Heat pump Hot water Pinch method Wastewater
Georges Nehme Denis Clodic
EReIE SAS,Palaiseau,France
国际会议
桂林
英文
1-10
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）