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First, the project overview Tiankun City Block A project is located in Zhen'an County, Shaanxi Province, with a total construction area of ​​28,988 square meters, 56.1 meters high, 18 on the ground, the ground floor. One basement for the garage, power distribution room and pump room and other equipment room, a storehouse, two shops, three to eighteen for the residential. Second, the air-conditioning hot and cold source of the design According to the construction of the groundwater sources and geological conditions, from the perspective of energy saving and environmental protection, after a variety of technical and economic comparison, and many discussions with the A, and ultimately decided to adopt air-conditioning hot and cold sources Dark blue ground source heat pump central air conditioning system. The system makes full use of low-grade groundwater heat, low-grade energy to enhance the use of. The system is mainly divided into three systems: a water system (groundwater), secondary water system, the end of the water system. Third, the design ideas According to two to eighteen layers of air-conditioning total cooling load of 1960kW, the total heat load of 1371kW, summer and winter groundwater as a ground source heat pump unit of cold and heat source. The device to R22 as a refrigerant in the summer to provide return water temperature 7/12 ℃ chilled water; winter return water temperature 55/50 ℃ hot water. Its comprehensive energy efficiency ratio in summer ~ 4, winter ~ 3. Once the water system is open system, the submersible pump draws groundwater to the fire-fighting pool, and then discharged to the filling well by the fire-fighting pool to avoid the long-term operation of the underground water pump, save the groundwater, save electricity and improve the utilization rate of groundwater. Secondary water system consists of two parts: ○ 1 plate side of the heat exchanger water pump pumping fire pool over the plate heat exchanger and then back to the fire pool or recharge well (open system); ○ 2 board for the use of water circulation pump system water After the ground source heat pump host, and then through the plate heat exchanger, once again cycle (closed system). The secondary water system board for heat source side is open, the circulation pump according to the board for the use of side temperature frequency conversion operation, so that the circulation pump energy-saving operation at low load; the secondary water system board for the use side is closed, the cycle The pump operates at variable frequency according to the system pressure and bypasses the pressure bypass valve at very low loads. This solves the problems of the traditional central air conditioning (large system) being unable to operate under low load conditions and serious energy waste. The end water system circulation pump is a self-contained water pump of the ground source heat pump unit that circulates the water in the system between the ground source heat pump unit and the indoor end (closed system). The entire water system uses expansion tank constant pressure replenishment, secondary water system expansion tank located on the roof, the terminal water system expansion tank are located in the nine-story ceiling and the roof. Fourth, the operating principle of the use of fire-fighting system as a peak-shaving use, in order to make full use of groundwater, save drilling costs, reduce initial investment, groundwater submersible pumps start and stop the fire under the tank level in order to make full use of groundwater and electricity. Secondary water system board heat exchanger side circulation pump according to the board for the use of temperature conversion frequency side of the operation, pumping fire water pool water through the plate after the summer when the water temperature is high, directly discharged to the injection well, the water temperature is low, return to the fire The pool is reused, and the winter is the opposite; ground source heat pump unit start and stop the control of the heat source side of the solenoid valve switch, so the board for the use of the pump based on system pressure frequency operation, and to ensure ground source heat pump units at low load State of the operation side of the plate for the supply and return pipe bypass pressure differential valve; the end of the water system by the ground source heat pump unit pump to provide the system for circulating power circulation between the heat pump unit and the indoor end of the water system. The system schematic diagram is as follows: Air conditioning water system diagram V. System Advantages The system of dark blue air conditioner uses clean water and electricity as energy sources, and has no solid, liquid and gaseous pollutant discharge during operation. It is a "green" environment-friendly heating system ) Of the environmental systems engineering; the system covers a small, flexible room layout, can be placed in the basement of the building. The system does not even need traditional heating boilers, coal ash yard, oil depot, gas station network and fire control system settings, saving floor space and saving construction costs. The decentralized air conditioning system not only has the advantages of flexible arrangement, small starting current and energy-saving operation under extremely low load, but also has the advantages of centralized air-conditioning in reducing the unit's model when considering different uses, saving initial investment, As well as energy-saving operation in a variety of load conditions. Compared with the boiler heating system, the heating system of the system reduces the area of ​​the boiler room and its ancillary facilities and saves the land resources. At the same time, the energy efficiency of the system is higher, the comprehensive energy efficiency ratio is about 3, while the boiler efficiency About 90%, the system has no exhaust emissions, and the boiler discharges a large amount of exhaust gas, polluting the environment; compared with the traditional screw cooling system, the system saves the cooling water system, less cooling water evaporates, saves water resources and also eliminates the cooling The tower noise source, breeding and water vapor drift evaporation, under low load, the traditional screw unit load regulation only four gear (25%, 50%, 75%, 100%), and the system to adjust a wider range of Partial load, the traditional screw unit stalls and stalls to stop and start to meet the load requirements of the room, run uneconomical, affecting the life of the unit, and the system to overcome the traditional central air conditioning under partial load operating uneconomical problem. The system compared with air-cooled heat pump (and VRV system), although the system is more complex, need to fight well, to fire tank or another repair pool, pump to be more, but the system regardless of cooling or heating than air-cooled Heat pump energy saving more than 40%, because the air-cooled heat pump by the summer outdoor temperature and winter outdoor low temperature, energy efficiency greatly reduced, the annual comprehensive energy efficiency ratio of about 2, and the system due to groundwater temperature almost constant throughout the year, the change is small, energy efficiency Stability is less affected by the outdoor temperature, the annual comprehensive energy efficiency ratio is about 3.5. The high investment VRV system has the same disadvantages as the air-cooled heat pump in the same way as the air-cooled system. When the outdoor outdoor high temperature in winter and outdoor outdoor low temperature, the room needs more cooling capacity or heat, the main unit energy efficiency is greatly reduced, Increase the amount of waste of energy, at the same time to meet the needs of room use, we must consider the impact of outdoor temperature, increase unit type, increase initial investment. Six, social benefits Ground source heat pump system has been widely adopted in Europe and the United States, the main reason: groundwater resources can be fully utilized and protected; more energy-efficient than other air-conditioning systems; COP values ​​higher, the energy efficiency of the traditional refrigeration 3 to 4 times, no pollution, no need to set the boiler in winter to heat. Low operating costs, the initial investment for the traditional electric refrigeration 2/3, operating costs only 1/2, while saving a lot of station area. Ground source heat pump system has become a new trend of HVAC industry development. The dark blue water source central air-conditioning is even more prominent energy-saving effect and significant quality advantage to become the industry's preferred brand!