From the survey results, the air source heat pump water heaters in recent years, the rapid development of Nanjing, and most of the engineering heat pump air conditioning system can still basically meet the required cooling and heating requirements. Below on the situation of several typical projects for some introduction. The Yangtze River Trade Building is a modern office building designed in 1991 and put into use in 1994. The building has a building area of ​​about 35,000 m2 and a total building height of 95m, of which, there are 23 underground floors above ground. Peripheral structure for the whole glass curtain wall. Six American Awakened AWHC-200 heat pump units were selected in the building. The installed capacity is 3672KW (1044RT), the area cold index is 105W / m2, the heat capacity of the heat pump is 3750KW and the area thermal index is 107W / m2. The heat pump unit is placed on the roof of the main building. The system is equipped with 8 pumps, each with a circulating water volume of 200m3 / h and a lift of 32mH2O. Heat pumps and pumps in parallel and then in series, respectively, the air source heat pump out of the water pipe directly connected to the sub-catchment, the pump placed indoors. Heat pump units using spring shock absorber damping, pump also uses vibration damping base damping. The end of the air conditioning system is designed to change the volume of water, the host machine is the fixed number of water control. According to the site survey and measurement, the staff of the building have higher satisfaction with air conditioners. In the summer, when the suction temperature is 40 ℃ (local exhaust short-circuit inhalation), the system effluent water is 7.58 ℃ and the backwater temperature is 12 ℃ 4.42 ℃ (heat pump run 5, the pump runs 3, there are a few floors are not in use), the indoor basically meet the design requirements of 26 ℃. In the winter of 1999, there was a heavy snowfall in the world. The temperature of water supplied by the system was fluctuated in the range of 39-40 ℃. The indoor temperature of a room in the south was maintained at 23 ℃. Winter bad weather, artificial defrost time interval of 30 minutes, defrost time lasted 5 minutes. Individual weather occurs in the morning can not boot normally, the administrator first set the conditions of the cooling and defrosting, and then enter the heating conditions. As the heat pump unit placed in the main building open roof, good ventilation. However, due to higher daughter wall, some heat pump appeared short-circuit airflow phenomenon. Short-circuit airflow phenomenon in winter is more obvious, this phenomenon can be easily observed through the fog flow path when defrosting. The noise of standard heat pump unit (200RT) in York Company is about 82dB (A), but due to the suitable position of heat pump, civil engineering treatment and vibration reduction measures are all appropriate (high daughter wall, heat pump and evacuation stairs are separated by pump room, And the stairs are separated by a certain horizontal distance), these comprehensive measures make the heat pump unit no significant impact on the building noise, heat pump in the hall floor where the measured noise of about 45dB (A), in close The heat pump at the lower office, the noise is about 45dB (A), the ceiling noise is about 50dB (A) or so. It can be seen that the comprehensive measures of vibration and sound insulation of the project have received obvious effects. A foreign trade company office building construction area of ​​about 27,000 m2, a total of 21 layers, a total height of 90 meters, the building envelope structure for the semi-glass curtain wall structure, the building in January 1996 completed and put into use. Building selected American York company AWHC-200-type heat pump unit 4, rated total cooling capacity of 2448KW, rated heating capacity of 2500KW, equivalent to the unit area of ​​cold targets 91W / m2, heating area index 93W / m2 (corresponding to the air source heat pump Rated condition, temperature 7 ℃, water 45 ℃). The heat pump is placed on the top of the tower, the top of the roof is a triangular horizontal opening of the top of the Venetian blind. System optional IS125-100-400 5 pumps, the pump rated flow of 100m3 / h, rated head 50mH2O, motor power 30KW, pump 4 with a prepared, the pump unit connected in parallel first and then connected in parallel with the heat pump group.