Field Testing of Water Source Heat Pump Systems in Chongqing of China

Abstract

As an application technology of renewable energy resource, water source heat pump (WSHP) has been paid more attention on. WSHP have been practiced especially for saving building energy consumption in Chongqing of China since there is abound water resources. However, it was found that some systems were not operated very well without achieving expected energy efficiency. Taking three real projects which use WSHP for heating and cooling of buildings in Chongqing city to test in field, key parameters were measured and operation performances were analyzed. The influences of water temperature and partial load ratio on system energy efficiency were studied. Based on existing problems, strategies for improving system energy performance are suggested from aspects of design and operating. Dynamic load hourly simulation plays a key role to determine appropriately the size and the form of system. More efforts have to be put on water pumps arrangement to save energy consumed for water transportation which accounts for large part of system energy. The temperature difference and water quality of water source should be controlled according actual operating conditions. The integrated systems and operation strategies under partial load are also beneficial for efficiency improvement.