Research On The Influences Of Different Indoor Design Parameters On Ground-coupled Heat Pump Systems

With environmental problems becoming more and more serious,buildings with energy saving attract more and more people's attention.Since the energy consumption of the air conditioning accounts for a large part in all kinds of energy using in buildings,the efficient energy-saving ground-source heat pump air-conditioning system taking advantage of shallow geothermal energy for heating and cooling has been widely used.The GSHP air-conditioning system has the characteristic of low operation cost and high stability,but the limit of the design and construction leads the problem of soil heat accumulation which degrades the performance of the system and even makes some units unable to start properly,resulting in insufficient use of the system.Many parameters have an impact on the performance of the GSHP air-conditioning system and a lot of research has been done to optimize the parameters to gain better performance.This paper propose the system optimization from the perspective of indoor thermal environment parameters.Different indoor thermal environment parameters has a different effect on human comfort.In this paper,winter and summer indoor temperature and relative humidity are studied and the range of the two parameters mentioned above is confirmed on the premise of comfort and health requirements.In this paper,office buildings in Wuhan are taking for an example to establish a DeST model,simulating the building energy consumption and humidification amount under different summer indoor temperatures,different summer indoor relative humidity,different winter indoor temperature and different winter indoor relative humidity.TRNSYS is used in this paper to build a model of the ground source heat pump assisted with a cooling tower,which is used to simulate the soil temperature,heat pump COP changeand system energy consumption of the GSHP air-conditioning system running for 20 years.By comparing the operating performance under different indoor design parameters,a reasonable indoor design parameters is determined to achieve the optimization of ground-source heat pump system.