Applied Research Of Underground Water Source Heat Pump With Screw Compressor In Plateau Valley

Energy and environmental protection is the two major themes of human survival and development, is the issue of global concern. As a renewable energy technology, heat pump technology has been widely used. Water source heat pump technology as a branch of the heat pump technology, the cost is relatively low,and promotion is rapid. There are abundant solar energy and underground water resources in the plateau Valley region, which are renewable energy sources. Ground water heat pump as the heat source for building heating has a huge development and utilization value.But hydrological and meteorological parameters of plateau valley area are very special. Groundwater source heat pump in the conditions of ordinary summer and cold winter areas are very different. Maerkang County in Sichuan Province is selected as a typical plateau valley region.They affected by the northwest flow in the winter months; climate in summer months is controlled by warm air from southwest.Here have ample sunshine,and the temperature between day and night have a large difference. Many applications in the highland Valley region of underground water source heat pump system, of meteorological parameters and hydrogeological conditions of the lack of in-depth analysis, unit assembly is not scientific, underground water and recharge is simple, lead to low system efficiency, cannot achieve the purpose of high efficiency and energy saving.This paper for Barkam region typical project case, a detailed analysis of the hydrological and meteorological parameters characteristics, through simulation and measured, on reasonable application of screw type underground water source heat pump system in the plateau Valley made related research.The paper focuses on the following aspects of the work:Statistical Barkam region for many years meteorological data and and Chengdu meteorological characteristics are compared and analyzed;use DeST software to simulate heat load of different types of buildings of Barkam region. Analysis the load characteristics, and is compared with the Chengdu area; fitting based on outdoor dry bulb temperature heat load prediction formula.On the analysis of the basis hydrogeological conditions of a 20,000 square meters complex project in Barkam region, count to complete three steady drawdown flow pumping and recharge tests, such as welling, pumping tests, trial recharging, water quality sampling, etc, forming a comprehensive pumping test results chart. Revise the main parameters of the underground hydrology of the engineering area in winter, and analyse the factors affecting the groundwater recharge rate. Based on the underground water source heat pump heat exchanger system to explore the direct discharge of groundwater adjacent to the river.Revises the screw type heat pump unit energy consumption model based on the winter operation test of a screw type underground water source heat pump system in Barkam to made it adapt to the Barkam region operating conditions; and use this model to simulate the performance of the screw type heat pump unit.Combined with all kinds of buildings in winter hourly heat load, from two aspects of different quantity of heat pump unit combination heating mode and different capacity ratio of two sets of heat pump unit combination heating mode are calculated and analyzed, that for the best operation mode of different types of buildings, using thermal load forecasting formula gives the proposed system operation strategies, reduce unnecessary energy consumption, optimization and energy saving effect.The conclusion of this paper provides a reference for the popularization and application of the screw type water source heat pump system in the plateau Valley region.