CO2 AIR-CONDITIONING SYSTEM

摘要

A carbon dioxide air conditioning system is provided to implement various heating-cooling modes with simple structure using all direction valve and a shut off valve. A carbon dioxide air conditioning system comprises a compressor(400) compressing a refrigerant; an evaporator(500) removing the moisture in the air in dehumidifying and heating mode and evaporating the refrigerant passing through the expansion valve(600) in the cooling mode; an outdoor heat exchanger(110) cooling the refrigerant of the high temperature and high pressure in the cooling mode; an indoor heat exchanger(120) heating up the air while cooling the refrigerant of the high temperature and high pressure in the heating mode; an internal heat exchanger(200) improving the performance of cycle by exchanging and circulating the refrigerant of the high temperature and high pressure and the refrigerant of the low temperature and low pressure to a first flow channel and a second flow channel respectively; the shut off valve(700) stopping or allowing the flow of the refrigerant; and the all direction valve(800) in which the flow hole is formed in rhombic, and the first flow channel(810), the second fluid path(820), a third flow channel(830) and a fourth flow channel(840), which connect adjacent flow outlets, are formed in inside.