Water loop heat pump air conditioning system is a kind of application mode of small water / air heat pump units,namely water loop will small water / heat pump units connected in parallel,to form a closed loop,a set of recycling building waste heat as the air-conditioning system,the low heat source heat pump heating cooling.The basic working principle of water loop heat pump system is:at the water / air heat pump heating,the water circulation loop of water as the heating source; refrigeration unit,with water as the exhaust heat source.When the water loop heat pump air conditioning system is less than the heat release heat absorption refrigerating operation,circulation loop of water temperature,to a certain extent cooling tower heat utilization; and circulating loop in the water temperature is reduced,to a certain extent by the auxiliary heating device to absorb heat.Only when the water / absorption heat air heat pump unit and cooling operation of the heat release is basically the same,circulating loop in the water to keep in a certain temperature range,the system efficiency.