5 Technical and Economic Analysis 5.1 Summer conditions Surface water source heat pump air conditioning system in summer operation and principle and the most commonly used water-cooled chiller air conditioning system is very similar, from the point of view of equipment, water source heat pump air conditioning cooling water system is no longer used Cooling towers, but rather rely on the reservoir for cooling, so from the initial investment point of view, water-source heat pump air-conditioning system eliminates the need for cooling tower equipment investment. From the operating cost point of view, the water-source heat pump air-conditioning cooling water system depends on the reservoir for cooling, the cooling effect of the cooling tower cooling is better, so the water source heat pump air conditioning COP value may be more than the commonly used cooling tower cooling water cold water Unit air conditioning system to be higher, but the operating cost savings is not obvious. 5.2 Winter conditions Base requirements, combined with the actual situation of surface water source heat pump air-conditioning system, mainly for the system of heating operating costs for technical and economic comparison. According to the local energy conditions, the technical and economic comparison is made mainly on the heating function of the boiler room + radiator system in the gas area and the groundwater source heat pump + fan coil system on the first phase of 100,000 square meters. Operating costs comparison According to the relevant information, the distribution of winter air-conditioning load in Beijing is assumed as follows: the average air-conditioning load accounts for 15% of the total operating time at 90%; the average air-conditioning load accounts for 30% of the total operating time at 60% The average air conditioning load accounts for 55% of the total running time at 30% of the operating time. The heating time in Beijing is 129 days according to the standard. Beijing electricity price in accordance with 0.60 yuan / kWh, Beijing gas boiler room heating price in accordance with 35 yuan / m2 calculation. In this calculation, surface water and system hot and cold water are assumed to be operated at constant flow. The regulation of operation of each fan coil in the building is consistent with that of air-conditioning load. The use of water-source heat pump units is calculated at 60% full load. Calculate the following table values: Item || number || unit price || (million) || total price || (million) |||| pump power consumption || 500 thousand degrees || 0.06 || 30 || | | Heat pump unit power consumption || 2700 åƒ åº¦ || 0.06 || 162 |||| Fan coil, fresh air unit power consumption || 320 åƒ åº¦ || 0.06 || 19.2 || || Staff salaries, material transport costs || 10 || Total 2,212,000 yuan || From the table, the surface water source heat pump system + fan coil system running costs per heating season is about 22.1 yuan / m2. 6 Conclusion and recommendations 6.1 Under the existing conditions, surface water source heat pump system can be used, and do a good job of filtration and deaeration corrosion (physical treatment only). 6.2 In the system design and construction is reasonable, and the surface water source heat pump system under the premise of normal use, the general will not have a negative impact on the environment. 6.3 Taking into account the possibility of continuous low temperature and water loss in winter, resulting in the extreme conditions of low water temperature and low water volume, in order to ensure normal heating in this case, an auxiliary heat source should be considered to raise the temperature of the chilled water of the heat pump unit, According to the actual situation of the base, the auxiliary heat source can be considered in the form of gas boiler. 6.4 According to preliminary estimates, the operating cost of surface water source heat pump system for heating system is 22.1 yuan / m2, which is lower than 35 yuan / m2 for gas boiler room heating system. The entire base annual saving operation costs about 1,882,000 yuan.