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1, the principle of ground source heat exchange pump Ground source heat exchange pump is divided into groundwater source heat exchange pump, surface water heat exchange pump (2011 China Heat Pump Exhibition) and underground pipe ground source heat exchange pump. Ground source heat exchange pump system is a closed system, circulating fluid (water or water as the main component of the antifreeze) in the underground pipe buried in the flow, to achieve the exchange of heat transfer between the system and the earth. Structurally, there is a buried pipe heat exchanger made up of buried underground pipes. Buried heat exchangers in the form of setting the main horizontal and vertical two. Vertical buried pipe is drilled in the formation of a diameter of 0.1m ~ 0.15m drill set in the group (2) or 2 (4) U-shaped pipe and filled with grouting material. Cooling conditions, the air-conditioned room with the cold load of the work of the compressor is converted into the amount of heat exchange is discharged into the earth outdoor heat exchange exchanger exchanger 1 and exchanger 2 (at this time the heat exchanger exchanger 2 in the heat exchange pump The role of the condenser unit), the heat exchanger through the pipe connected to the heat exchanger 2 absorbs the amount of heat exchanger, through the outdoor heat exchanger exchanger 1 into the earth; when the heat exchanger 2 is converted into a heat exchange pump Unit evaporator, circulating water through outdoor outdoor heat exchange exchanger 1 exchanger absorbs heat in the ground in the heat exchange exchanger 2 (evaporator) released to the refrigerant. The same can both indoor water circulation heat transfer quantity transfer, you can also make the refrigerant directly through the room heat exchanger and air exchange heat exchange. 2, the characteristics of the ground source heat exchange pump 1) energy saving: ground source heat exchange pump cooling than the traditional central air conditioning system operating efficiency should be increased by 30% ~ 50%; heating than the heat exchange force pipe network for heat exchange or fuel Gas heat exchange system to reduce 20% to 60%. 2) Emission reduction: Clean coal will be replaced by clean energy instead of burning coal, and no CO, CO2 and other greenhouse gases will be produced in the system without combustion equipment. Room using water as a circulating medium, there is no leakage of freon. 3) Environmental protection: no combustion process, there is no pollutant emissions, is a green technology. 4) Long-term effect: The amount of heat exchange taken out in winter can be compensated in the summer, recycled throughout the year, and has regenerability; there is no hidden danger of environmental pollution and avoid damage to resources and sustainability. Ground source heat exchange pump also has some shortcomings: 1) high initial investment; 2) the local geological conditions and climatic conditions and so on. 3, analysis of the project to a villa project as an example. The total construction area of ​​639m2, the indoor temperature summer line try to use overhead, not overhead but also take protective measures. Be careful not to let the wire soaked in water or by objects rolling, wire aging, skin damage, electrical appliances and parts defects, etc. should be promptly replaced and maintained, repaired, the use of towline disc, multi-purpose socket without rain measures appliance. 4. Conclusion In order to ensure safe production and civilized production and ensure the safety of people's lives and property, we have only found and solved various problems in the safety of construction electricity consumption in a serious and responsible manner during the construction of the project. Electricity safety accidents should be put an end to the sprouting, start from the safe bit by bit, understand the safety is no small matter, there will be the construction industry survival and development of hope and economic and social benefits of a win-win situation. 24 ℃ ~ 26 ℃, winter 26 ℃ ~ 28 ℃; relative humidity: 45.5% ~ 60.5%. Therefore, the villa air-conditioning system proposed to use energy-saving environmental protection ground source heat exchange pump air conditioning system. 4.1 Load calculation Combined with Shanghai meteorological parameters, the system in the cooling conditions, the freezer temperature is 7 ℃ ~ 12 ℃, the condenser temperature is 40 ℃ ~ 45 ℃, the calculated cooling load 79.2kW, heat exchange load 65kW. Because the amount of heat exchange in winter is less than the amount of heat exchange in summer, the selection of underground heat exchangers is selected on a summer basis. As a result, the cold and heat exchange loads of underground heat exchangers are respectively 95kW and 49.4kW. 4.2 System Design 1) to determine the underground heat exchanger tube form and pipe connections. Considering the small garden area of ​​the villa building, a vertical U-tube underground heat exchanger was used. On the vertical buried pipe system, the initial investment and operating costs of parallel mode are more economical. Because it is difficult to set the control valve or the balance valve in the underground pipe multi-loop, it is difficult to achieve the hydraulic balance of each loop of the system, so the same program is adopted. 2) tube length estimation. General vertical single U-tube heat exchange tube exchange capacity of 50W / m ~ 80W / m (well depth), the design may take the lower limit of heat exchange capacity. 3) to determine the pipe spacing. The vertical ground heat exchanger is calculated on the basis of heat transfer analysis of a single bore 3.14s. When the buried pipe spacing is more than 3.5m, the influence of the earth heat exchange resistance is small. Reference to GB50366-2005 ground source heat exchange pump system specifications require buried pipe spacing of 3m ~ 6m, according to not less than 4m spacing design to ensure the normal use of soil coupler. 4) Determine the number and spacing of shafts. Due to the geological conditions in Shanghai 0m ~ 100m, mostly clay, sand-based. Combined with the actual situation of the soil and the actual use of the project and the pressure capacity of PE pipe to ensure the safety of soil exchange heat exchanger, select the drilling depth of 90m. Calculate the number of boreholes available in summer for 21, winter for 18, so take 21. To sum up and consider various factors, the proposed pipe embankment for the project is: single U-shaped buried pipe, depth 90m, spacing 4mX4m, the number of design holes 21. 4.3 Economic Analysis Ground source heat exchange pump is a highly efficient energy saving and environmental protection technology, but whether or not the ground source heat exchange pump is economically competitive will be a key issue whether or not the ground source heat exchange pump can be actually used. Due to many factors involved, different regions, different energy structures and prices will directly affect the economy of the ground source heat exchange pump. It can be seen from the basic situation of three common energy sources of electricity, natural gas and diesel that using the ground source heat exchange pump reduces the cost and greatly increases the primary energy utilization rate, thus having the advantages of high efficiency and energy saving. 5, Summarize the ground source heat exchange pump system and the traditional air conditioning system comparative analysis, both need heating and air conditioning sites, ground source heat exchange pump in the current energy prices have strong economic competitiveness. The performance coefficient than the average air conditioner has greatly improved, and equipment focus, good performance, with good feasibility.