| The ground source heat pump system with advantages of its energy saving,environmental protection,stability and no heat pollution,receiving much concern,is recognized as the most promising one of the heat pump air conditioning technology of the 21 century.In recent years,ground source heat pump system for cold-heat source project increasing in our country,but most of these projects are the single heat source,tend to ignore the regional environment and resources advantage,multi-heat source heat pumps rarely used.This paper research on the adaptability of the multi-heat source heat pumps in hot summer and warm winter area.And the work of this paper,according to the characteristics of climate,resources and building energy consumption in hot summer and warm winter zone of our country,put forward to design ground source heat pump system by combining with the soil source,solar energy and air conditioning condensation heat source.According to the actual running situation analysis,the multi heat source heat pump system in hot summer and warm winter zone is effective application mode.Based on the soil source heat pump demonstration project of Xingjian Liberal Arts College of Guangxi University as the research object,this paper studies on the technical feasibility and operating results of the system.That the system adopted by 3 working condition can realize the stable operation,cooling and heating COP above 3.5,comprehensive COP reach 6.6 or above.Compared to using a separate heating and cooling system,the heat balance rate of heat multi-level shunt heat pump system is reduced to 17.0%feom 35.9%.Heat absorption and releas from soil annual are reduced to 55.8%and 48.7%respectively,annual heat difference has decreased by 75.7%.In the hot summer and warm winter zone with a strong solar radiation of subtropical regions,the high annual average temperature,the abundant energy of solar radiation,the paper optimizes and improves the multi heat source of direct-expansion solar-ground source heat pump system in Guangxi University dormitory buildings and operation characteristic researched.1,When the temperature of hot water in winter set to 50?,the rest season set to 47 ?,the system has a high energy conservation and economy.2,Winter,summer two season run solar conditions,in the same conditions of solar radiation in summer than in winter,for COP above 1.0,mainly due to the summer heat collection plate evaporation temperature much higher than in winter,more conducive to the collector.3,The direct-expansion solar heat collection plate application,collector angle should not be too big,should try to lower angle,in order to ensure the refrigerant of heat collecting plate distribution,collector angle take 22.6° most reasonable in Nanning area.4,The COP of the system in the summer can reach 5.0 when system run multiple heat sources;the COP of winter system is above 3.0 with the collector plate contributed 20%of the heat source.Which is useful to reduce the initial investment and maintenance the stability of the temperature field of the pipe region.5,Contrast to the single ground source heat pump systems and multi-source heat pump system,the former is 2.4 times than the latter in taking the heat from the soil,and to take the heat from the soil is more 288MJ every year.Through the above research,the author hopes to promote multi heat source heat pump system in hot summer and warm winter zone to local conditions and rational utilization.In addition,this article provides some reference for practical engineering application of ground source heat pump system design. |
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