Application And Performance Analysis Of Hybrid Ground Source Heat Pump In Hot Summer And Cold Winter Regions

With the rapid development of the global economy and increasing energy, the environment is deteriorating, because building energy consumption accounts for a large proportion, and air conditioning and refrigeration industry is a large energy consumption, energy saving and environmental protection is undoubtedly the refrigeration industry forever tone. In recent years, with the rapid development of ground source heat pump technology, on the one hand it can be used as a renewable energy source, on the other hand, the ground source heat pump has the characteristics of high efficiency, energy saving, environmental protection, the heat pump technology has been researched and applied widely at home and abroad. However, due to the climate in some special areas, in the case of the different functions of the building with ratio of cooling and heating load, the different heating capacity required for cooling, so easily lead to soil thermal imbalance problem, the problem is also an important source heat pump technology needed to solve.In the hot summer and cold winter area, the cooling load in summer is far greater than the winter heat load, which leads to heat accumulation problem of soils; we can use the auxiliary cooling way auxiliary heat to keep the soil thermal equilibrium. In order to solve the problem, two kinds of the composite ground source heat pump system, namely, the hybrid ground source heat pump system(HGSHPS) with cooling tower and the HGSHPS with water chiller, which is introduced and researched in this paper.City in the south of the Yangtze River, Zhenjiang as an example, research a typical office building. The building all-year hourly load is calculated and the characteristics of the annual dynamic load were analyzed by the principle of heat balance method. According to the computational load, design HGSHPS and units. The load rate is introduced to the HGSHPS with chiller. According to the 50% rate respectively distribute to heat pump unit and water chiller. Adopt the time control method and temperature control method. Based on modules of modular analysis software TRNSYS, establish mathematical model of components, main modules and systems of the conventional ground source heat pump system and the HGSHPS. The simulation model was established by the software in order to simulate the running situation of heat pump units and system in a decade.Finally, we compared and analyzed the condition of soil thermal equilibrium, the Import and export temperature of buried pipe and the energy consumption and COP coefficient of performance of the system of the conventional and the HGSHPS. For the conventional ground source heat pump system, the soil temperature rise rapidly and the thermal imbalance problem is serious. So it is not applicable in hot summer and cold winter area. Compared with the HGSHPS with cooling tower, HGSHPS with water chiller has lower energy consumption and better soil thermal equilibrium and run more stable. According to the research, so as to obtain a more applicable, optimized design scheme.