| Accelerating the urbanization process in China led to the rapid development of the construction industry, leading to the building energy consumption increased year by year in the social total energy consumption. However, air conditioning energy consumption occupy a large proportion of the building energy consumption, become the current focus area of the energy conservation and emission reduction in building.In our building construction and the use of energy resources, the trouble of the high consumption and low efficiency of energy is very serious. Resources,energy and environmental issues have become an important factor restricting the development of city. Therefore, we must recognize that the importance of developing clean,environmentally friendly and renewable energy.Domestic and foreign heating, air-conditioning fields of research scholars make a lot of research for ground source heat pump technology of renewable energy sources.Among them, the study of underground heat exchange system have a large proportion, effect of heat transfer performance research has focused on building dynamic load, underground penstock inlet and outlet temperature, flow, hole spacing,soil type, initial soil temperature, soil thermal parameters, borehole backfill and other factors on the ground heat exchange system, The main research method is to verify the numerical simulation results through experiments. The study through the data track detection, energy efficiency analysis and modeling the end whether the air conditioning system to meet the requirements of indoor comfort of ground source heat pump system is so seldom.This paper first design and build experimental platform for super high-rise office building used by vertical double U pipe heat pump system in Anhui province, Analyzes the impact of changes in soil thermal parameters for underground heat exchange heat transfer performance and underground temperature field. By thermal response test obtained the initial temperature of the rock layer is quite local annual average temperature, obtain the original temperature of the soil layer for this project is 18.4℃,underground temperature is preferably. Based on the line heat source theory, adopt slope method to obtain the composite thermal conductivity of the soil is 1.811W/(m·K),heat capacity is 1.89×106 J/(m3·K). By calculation, to determine the total length of the pipe, the number of drilling, the type of water pump and air-conditioning equipment.Second, recording the winter and summer data of ground source heat pump system to analyze the energy efficiency targets and operational benefits. And analyze the relationship between indoor and outdoor temperature, humidity, supply and return water temperature of the user side and the ground source-side, pump flow to obtained:(1) Winter and summer in the ground source heat pump operating status,outdoor temperature was less affect on the indoor temperature and humidity.(2) The temperature changes of user side supply and return water is small in the same day,when the supply and return water temperature reaches the design value, with the continuous load operation, the supply and return water temperature has a downward trend, decline in 2℃~3℃.(3) the supply and return water temperature of user side is to increase, pump flow is relatively reduced, otherwise the increase.(4) In winter and summer, outdoor temperature has little effect on the supply and return water temperature of user side.(5) After the ground source heat pump operation,energy-saving, economic and environmental benefits are good.Finally, take advantage of PHOENICS 2014 software to simulate and analyze the office indoor air distribution on two forms of the top air supply and side air supply.And compare simulated with measured wind value of indoor 1.2m height, make error analysis. Obtain suitable areas for indoor working places under different forms of ventilation, thereby improving the working environment comfort for office workers. |
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