Water source heat pump technology is through the use of shallow surface water absorption of solar and geothermal energy formed by the low heat energy resources, supplemented by a small amount of electricity in winter, from relatively high temperature water source to extract heat from the heat pump unit through the air or water as a carrier for the Building heating; summer uses the relative low temperature of the water to remove heat from the building. Air-cooled heat pumps use air and electricity to do all this. According to various considerations and local hydrogeological conditions and the future economic, environmental protection and energy saving measures, we try to adopt water source heat pump system to design this area and obtain better results. The results are summarized as follows , There are deficiencies, willing to please correct me. 1 Project Overview Jinyuan coal mine administrative office area and police, prisoners living area covers an area of ​​30000 m2, mining area sub-office building, dormitory, hospital building and teaching building four. 2 Economic Analysis Design by the School of Architecture and Design initially designed four programs, due to various considerations, rejected two of them, requiring the remaining water source heat pump central air conditioning and air-cooled heat pump central air conditioning two options for analysis and selection. The initial investment and operating costs of the two programs conducted a preliminary economic analysis. Initial investment costs are shown in Table 3, operating costs more in Table 4. 3 design options Air conditioning design standards 3.1 Design parameters (see Table 1 Table 2) Air conditioning interior design parameters Dry bulb temperature / ℃ Relative humidity /% Fresh air volume / m3 Person h Noise / dB (A sound level) Summer 24 ~ 28 50 ~ 70 20 ≯60 Winter 18 ~ 20/20 ≯60 Air conditioning Outdoor design parameters Dry bulb temperature / ℃ Wet bulb temperature / ℃ Relative humidity /% Atmospheric pressure kPa Summer 33.5 27.7 83 100.45 Winter 5/70 101.95 3.2 Load calculation Cold load: The load of the air conditioning site in the mining area includes the heat transfer of the enveloping structure, the cooling of the equipment, the cooling of the human body and the cooling of the lighting. The heat transfer of the envelope is calculated according to the calculation method in "Practical Design Guide for Heating, Air-conditioning and Air-conditioning" and is calculated by combining a large number of calculations with other heat sources to obtain the air-conditioning cooling load index of 2676W / m2 and the heat load of 2072W / m2. From Table 3, we can see that the overall cost of air-cooled heat pump central air conditioning is higher than the water source heat pump central air conditioning, and air-cooled heat pump cooling heat coefficient with the outside world constantly changing temperature, resulting in unstable cooling system, resources Serious waste And water source heat pump units and air-cooled heat pump units, has the following advantages: a) water is deep well water, water temperature is more constant, more reliable unit operation, and ensure system efficiency and economy, and without special maintenance or operation, Operation and maintenance costs are minimal. b) outdoor unit without special defrosting equipment, equipment is simple. c) As the heat source temperature of water source heat pump is relatively stable throughout the year, it is generally 10-25 ° C. Its cooling and heating coefficient can reach 3.5-4.4, which is about 40% higher than that of the traditional air source heat pump. Its operation The cost of ordinary central air-conditioning 50 to 60%. d) It is a technology of renewable energy utilization. Water source heat pump is a heating and air conditioning system that uses the solar energy stored in the earth's water as a source of heat and energy for energy conversion. Among the available water bodies are groundwater or rivers, rivers and lakes that are part of the surface, and oceans. Surface soil and water bodies are not only huge solar collectors that collect 47% of the solar radiation energy, more than 500 times the amount of energy used annually by human beings (underground water bodies receive indirect solar radiation energy through the soil) and are A huge dynamic energy balance system, the soil and water on the surface naturally maintain the relative balance of energy acceptance and divergence. This makes it possible to utilize almost infinite solar energy or earth stored therein. So, a water source heat pump uses a technology that is clean and renewable. e) The available water temperature of the energy-efficient water source heat pump unit is 12-22 ℃ in winter and the temperature of the water body is higher than the ambient air temperature, so the evaporation temperature of the heat pump cycle is increased and the energy-efficiency ratio is also improved. The summer water body is 18-35 ℃, the temperature of the water body is lower than the ambient air temperature, so the condensing temperature of the cooling decreases, making the cooling effect better than the air-cooled and cooling towers, and the unit efficiency is improved. According to the EPA of the United States Environmental Protection Agency, the design and installation of a good water source heat pump can save 30-40% of the heating and cooling air-conditioners on average. f) stable and reliable operation The temperature of water body is relatively stable all year round, the range of its fluctuation is far less than the change of air.