Based on recent survey results, air source heat pump water heaters have experienced rapid development in Nanjing, and most engineering heat pump air conditioning systems are still capable of meeting the required cooling and heating demands. Below is an overview of several typical projects.
The Yangtze River Trade Building is a modern office complex designed in 1991 and completed in 1994. It covers approximately 35,000 square meters with a total height of 95 meters, including 23 floors above ground. The building features a full glass curtain wall as its exterior structure. Six American AWHC-200 heat pump units were installed, with a total capacity of 3672KW (1044RT). The cooling load is around 105W/m², and the heating capacity reaches 3750KW, corresponding to a heating load of 107W/m². These units are located on the roof of the main building. The system includes eight pumps, each with a flow rate of 200m³/h and a head of 32mH2O. The heat pumps and pumps are connected in parallel first and then in series, with the heat pump's discharge piping directly linked to the sub-distribution system, while the pumps are placed indoors.
To minimize vibration, the heat pump units are equipped with spring shock absorbers, and the pumps also use vibration damping bases. The air conditioning system at the end is designed for variable water volume, while the host machine operates under fixed water flow control. According to site surveys and measurements, building staff report high satisfaction with the air conditioning system. In summer, when the suction temperature reaches 40°C (due to local exhaust short-circuiting), the system’s outlet water temperature is 7.58°C, and the return water temperature is 12°C, with a difference of 4.42°C. Under these conditions, the indoor temperature generally meets the design requirement of 26°C. During winter 1999, heavy snow occurred globally, causing fluctuations in the system’s supply water temperature between 39°C and 40°C. A south-facing room maintained an indoor temperature of 23°C. On days with severe weather, the defrost cycle lasted 5 minutes every 30 minutes. Occasionally, in the morning, the system would not start normally; administrators would first set the cooling and defrost conditions before switching to heating mode. Due to the open roof placement of the heat pump units and good ventilation, some airflow short-circuiting was observed, especially during winter. This phenomenon became visible during defrosting, as seen through the fog flow path. The noise level of a standard 200RT York heat pump unit is about 82dB(A). However, due to proper positioning, civil engineering treatments, and effective vibration reduction measures—such as separating the heat pump from the evacuation stairs by a pump room and maintaining a horizontal distance—the noise impact on the building is minimal. Measured noise levels in the hall floor were around 45dB(A), and in nearby offices, they were similarly around 45dB(A), with ceiling noise reaching about 50dB(A). These comprehensive measures have significantly reduced the noise and vibration effects, proving highly effective.
A foreign trade company’s office building, covering about 27,000 m² and 21 floors with a total height of 90 meters, was completed in January 1996. The building features a semi-glass curtain wall structure. Four American York AWHC-200 heat pump units were selected, with a total cooling capacity of 2448KW and a heating capacity of 2500KW. This corresponds to a cooling load of 91W/m² and a heating load of 93W/m² (under rated conditions: 7°C water temperature, 45°C supply). The heat pumps are installed on the rooftop, where there is a triangular opening for the Venetian blind. The system includes five IS125-100-400 pumps, each with a flow rate of 100m³/h, a head of 50mH2O, and a motor power of 30KW. Four pumps are available, and they are first connected in parallel and then in parallel with the heat pump group.
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