Measurement For Energy Efficiency And Analysis Of The Typical Ground Source Heat Pump Systems

The development of HVAC technology meets the requirements of building environment,which are much higher on health and comfort.As a result,the energy and environment problem is increasingly outstanding.In building energy consumption,air conditioning system and hot water system in energy consumption accounted for nearly 60%of the total energy consumption of buildings.In the process of urbanization construction,if the amount of China’s urban construction is double in the future,with the improvement of people’s living standard,the building energy consumption is likely to increase more than one times.Ground source heat pump system have the most important characteristics which is efficient and alternative.It is one of the effectively reducing energy consumption of building energy saving technology in our country.First of all,the author introduces the working principle of ground source heat pump system,and analyzes the composition,classification and characteristics of ground source heat pump system.Based on the comprehensive review and the summary of the technology and the economic evaluation methods and conclusions of the ground source heat pump,this paper puts forward the evaluation method of the ground source heat pump system.This paper mainly analyzes from three aspects which are energy efficiency,economic benefits and environmental benefits.The energy efficiency indexes consist of heat pump unit performance coefficient,coefficient of performance of heat pump system,the energy saving rate and the amount of conventional energy alternatives.The economic indicators consist of cost-effectiveness ratio,static investment payback period.The environmental benefit index consist of the emission reduction of CO2 and SO2 and the dust.So as to form the comprehensive evaluation index of ground source heat pump system.On the basis of the comprehensive evaluation index,the author has conducted field tests on typical cases.The test content includes the indoor and outdoor temperature,the inlet and outlet water temperature and flow rate of the user side and ground source side,unit input power and power consumption of water pump and ground source heat pump.Through sorting and analysing the data obtained,the refrigerating capacity,the heat production and the power consumption are calculated at first.On the basis of the analysis and comparison with the conventional air conditioning system,the author calculates the energy efficiency,economic benefits and environmental benefits of the system,and carries out the quantitative evaluation and analysis as well.By means of conventional energy alternatives,the paper reflects the excellent energy efficiency of the ground source heat pump system.The comparative analysis shows that ground source heat pump system has a good effect of energy saving and emission reduction that the energy saving rate can reach 30%,therefore it is an available way of heating in winter and cooling in summer although the large initial investment amount compared with the traditional centralized coal-fired heating and air conditioning.Finally,the main conclusions of this paper are as follows.The paper summarizes the ground source heat pump system performance evaluation method,and the method can evaluate and analyse the system more reasonable of ground source heat pump system for the energy saving and economic performance.Ground source heat pump system in practical application makes a diffirence because of the difference of project scale,management mode and related technical level of the equipment.Application of a mature ground source heat pump system can really achieve the energy conservation and emissions reduction.