Dynamic Simulation Of Ground Source Heat Pump

The ground source heat pump (GSHP) system is a highly energy-efficient and environment-protecting system using the renewable energy, which is considered as one of the most promising air-conditioning systems and has a broad application prospect. Ground-source heat pump air-conditioning systems use middle medium planted on the ground in the closed loop in circulation, and the earth to heat exchange, thereby achieving the heat pump to the air-conditioned buildings. Domestic on the study of Ground-source heat pump is still in the initial stage, and the research of ground-source heat pump systems on performance prediction, the optimal design and other aspects is still very imperfect, but also lack of corresponding norms, which largely restricted to Ground- source heat pump applications.Typical ground-source heat pump is absorbing from the soil or releasing heat to the soil. In the summer, indoor residual heat is transferred by heat pump ,and through underground heat exchangers release to the soil and the heat is stored for the winter; in the winter, heat pump absorb heat from the soil by underground heat exchanger, then supply heat to users, while the cold is stored to the soil, preparing for summer air-conditioning use. Such heat pump system including three parts: underground heat exchangers, heat pump systems and end users.This paper is a study on ground-coupled heat pump, which is the most major research direction of ground-source heat pump; we establish a physical & mathematical dynamic simulation model respectively in accordance with the compressor, condenser, expansion valve, evaporator, underground heat exchangers and end users of the GCHP system. These models are then intrinsically assembled into a complete simulated mathematical model of the ground source heat pump set by using the laws of energy conservation and quality conservation as well, as is on the base of a simulated mathematical model of the heat pump coupled with room load and underground heat exchanger. Establish the dynamics simulation of the ground source heat pump system by Matlab/simylink to imitate the dynamic operation principle of the system in the summer, an analysis has been made of the very factors affecting the operation performance of the ground source heat pump set and the forecast of the operation of the heat pump. The conclusion provides theoretical basis to optimize the system design and operation.