Analysis of the Performance Improvement of a Lake Water Heat Pump System in Nanjing
By introducing the principle of lake-water heat pump systems,the problem of potential shutdown of lake water heat pumps at low temperatures in winter was analyzed,and the solution of a solar energy compound lake water heat pump system(SECLWHPs)was proposed.Taking a lake water heat pump system in Nanjing as an example,optimization and upgrading was made,and a SECLWHPs was designed to address the problem.By establishing the lake water heat balance model and measuring the operational data,the system operating parameters,energy saving effect,and economic indicators before and after the transformation were compared,the results show that the SECLWHPs can effectively solve the problem of shutdown of the system in low temperature.The system runs quite stable,and the COP is increased by 0.45 on average.The seasonal performance coefficient of the optimized system is 2.72,0.24 higher than the original system.Compared with the system before optimization,its operation cost in heating season is about 72,710 yuan,and the payback period is about 0.17 years,showing good energy saving and economic benefits,and providing a reference for the optimization design of LWHPS.
low temperaturelake water heat pumpsolar energycoefficient of performance
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