Test And Analysis On The Energy Efficiency Of Ground-source Heat Pump Systems Engineering In Hubei

Though many ground-source heat pump system demonstration projects have beennewly constructed and reformed in Hubei, there are not much field test and data analysis,and also lack of summary and analysis about actual operation situatio n and applicationeffects of ground-source heat pump systems engineering. So researches in these aspectsare carried out in this paper.In this paper, the main content and test methods of the ground-source heat pumpsystem efficiency test is presented, the test platform is designed, and the error source ofenergy efficiency test is analyzed. This article analyzes the engineering cases of theunderground water source heat pump and ground-coupled heat pump system which arewidely applied. The change of the parameters and the coefficient of performance of theunit and system of ground-source heat pump system under different working conditionsare researched, and the operation stability and thermal balance of system is analyzed.Finally, this article analyzes18projects which have been completed assessment,summarizes the application of ground-source heat pump technology in the area of Hubeiprovince, and analyzes the indoor comfort, performance parameters, the benefits ofenergy-saving and environment protection of different systems.The analysis of test data of underground water source heat pump system of a bank inYichang shows that it has good stability and thermal balance, which can be taken asreference for the design and operation of other engineerings. A Ground-coupled heat pumpsystem of a hospital building in Tianmen has good benefits of energy-saving andenvironment protection, but there is a problem in thermal balance. Most ofperformance coefficient of the units and energy efficiency ratio of the systems are higherin the18demonstration projects. In almost all projects temperature difference betweeninlet and outlet of the user side is below5℃. In some projects systems are operating withlarge flow rate and small temperature difference. Through the analysis of thermodynamic perfect degree, it is concluded that operating performance of the unit in winter is betterthan that in summer. Heat pump system has remarkable energy conservation andenvironmental protection benefits and the underground water source heat pump systemhas better energy saving and environmental protection benefits than ground-coupled heatpump system.