The Ground Thermal Response Test And Energy Efficiency Evaluation Of Ground-Source Heat Pump System

In consideration of the serious situation of the world's energy problems and the rapid depletion of fossil energy such as coal, oil and natural gas, the development and utilization of renewable energy sources has increasingly been regarded highly by various countries, and it has been an important energy source to contribute to energy diversification and sustainable development. For its remarkable effect on building energy conservation, Ground-source heat pump which uses shallow geothermal resources as heat source and cold source has become a new efficient and energy-saving HVAC technology to use renewable energy sources and obtained more and more attention in our country. As an important means to explore energy conservation potential in the central air-conditioning system, Ground-source heat pump develops rapidly in recent years.In this paper, ground thermal response test and energy efficiency evaluation of ground-source heat pump system are researched, chapter 2 to chapter 5 state the main contents.The chief content of the second chapter and the third chapter of this paper that studied is ground thermal response test. First and foremost, theoretical models and data processing method for ground thermal response test are analyzed, the difference and suitability of indefinite length linear heat source model, indefinite length cylindrical heat source model and finite length linear heat source model are compared, and calculation software for ground thermal response test is programmed based on the analysis above. Secondly, the step and method for ground thermal response test are summarized, and then the method to determine the parameter of the rock-soil thermal properties and borehole heat resistance is discussed. At last, a new data processing method for ground thermal response test based on three parameters estimation and the analysis of the average error is proposed.The chief content of the fourth chapter and the fifth chapter of this paper that studied is energy efficiency evaluation of ground-source heat pump system. First and foremost, the content and method of energy efficiency evaluation is introduced, specific calculation method and formula to estimate energy-saving efficiency of ground-source heat pump system are also proposed. Secondly, three projects' energy efficiency which separately uses ground-coupled heat pump system, river water-source heat pump system and lake water-source heat pump system are evaluated in Chongqing area, the performance test results are emphatically discussed and the problems existing in the process of system operation are summarized. At last, energy-saving efficiency of these systems is estimated, Due to favourable variable water temperature capacity, these systems have a notable energy-saving effect.