| 摘要 |
PURPOSE: An integrated air conditioning system including freezing, refrigerating, cooling, heating and hot water supply functions using natural coolant is provided to improve the system performance by increasing the thermal capacity of the system. CONSTITUTION: An integrated air conditioning system including freezing, refrigerating, cooling, heating and hot water supply functions using natural coolant comprises a compressor(1), a first heat exchange module(110), an internal heat exchanger(5), a first pressure control valve(7), a coolant tank(8), a second pressure control valve(9), expansion valves(15,16), and a second heat exchange module(120). The compressor compresses carbon dioxide coolant to high pressure and high temperature of a supercritical state. The first heat exchange module heat-exchanges the coolant provided from the compressor and an external heat source. The internal heat exchanger heat-exchanges the coolant provided from the first heat exchange module with the coolant provided from the second heat exchange module. The first pressure control valve changes the refrigerant passing through the internal heat exchanger from the supercritical state to a subcritical state. The coolant tank stores the liquid coolant provided from the pressure control valve. The second pressure control valve controls the internal pressure of the coolant tank to be uniform. The expansion valve changes the coolant to the saturated steam state of low temperature and low pressure. The second heat exchange module heat-exchanges the coolant of saturated steam state provided from the expansion valve with the external heat source.
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