HEAT PUMP SYSTEM HAVING HEAT EXCHANGER FOR INCREASING THE TEMPERATURE OF WATER ENTERING HEAT PUMP FROM HEAT SOURCE

摘要

PURPOSE: A heat pump system with a heat exchanger for increasing the temperature of circulating water is provided to improve heating performance by the increment of the temperature of circulating water and the evaporation temperature in an evaporator. CONSTITUTION: A heat pump system(10) comprises an underground heat exchanger(210), a solenoid valve(310), a pump(110), a load heat exchanger(220), a heat exchanger(240) for increasing the temperature of circulating water, a heat source heat exchanger(250), an internal heat exchanger(230), an expansion device(400), a first four-way valve(320), and a second four-way valve(330). The underground heat exchanger exchanges the heat between circulating water and ground heat. The solenoid valve changes the flow direction of the circulating water. The pump transfers the circulating water to the solenoid valve. The load heat exchanger exchanges the heat between refrigerant and water circulating an indoor air conditioner(500). The heat exchanger for increasing the temperature of circulating water exchanges heat between the refrigerant and the circulating water. The heat-exchanger in a heat source exchanges the refrigerant and the circulating water. The internal heat exchanger exchanges heat between high temperature refrigerant and low-temperature refrigerant. The expansion device expands the refrigerant.