Air conditioning system of data center

The present invention provides a data center air conditioning system, which comprises: a compression unit which compresses low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant; a first coil connected to the compression unit through a flow path through which the refrigerant flows, and condensing or evaporating the refrigerant flowing in a flow direction of the refrigerant; a second coil connected to the first coil through a flow path through which the refrigerant flows, and reheating supply air with condensation heat of the refrigerant selectively introduced in accordance with a cooling load and the humidity of the supply air; a third coil connected to the first coil and the second coil by a flow path through which the refrigerant flows, and condensing or evaporating the refrigerant flowing in the flow direction of the refrigerant; an expansion valve provided at one side of the third coil to expand the condensed refrigerant to a low temperature and a low pressure, and providing the expanded refrigerant to the third coil; a first liquid refrigerant circulation flow path branched from the other side of the first coil in a second refrigerant flow path and connected to the other side of the third coil in a third refrigerant flow path; a second liquid refrigerant circulation flow path branched from one side of the third coil in the second refrigerant flow path and connected to a discharge side of the compression unit in the first refrigerant flow path; a refrigerant pump provided on the first liquid refrigerant circulation flow path to deliver liquid refrigerant along the first liquid refrigerant circulation flow path; and a control unit electrically connected to the compression unit and the refrigerant pump, and controlling the operation of the compression unit and the refrigerant pump based on an outdoor temperature. In accordance with the present invention, power consumption is reduced and the coefficient of performance is increased. 본 발명은 저온저압의 기상냉매를 고온고압의 기상냉매로 압축하여 제공하는 압축부와, 상기 압축부와 냉매가 유동하는 유로로 연결되고, 냉매의 유동방향에 따라 유동하는 냉매를 응축 또는 증발 시키는 제1코일과, 상기 제1코일과 냉매가 유동하는 유로로 연결되고, 냉방부하 및 급기의 습도에 따라 선택적으로 유입되는 냉매의 응축열로 급기를 재열하는 제2코일과, 상기 제1코일 및 제2코일과 냉매가 유동하는 유로로 연결되고, 냉매의 유동방향에 따라 유동하는 냉매를 응축 또는 증발 시키는 제3코일과, 상기 제3코일의 일측에 구비되어 응축된 냉매를 저온, 저압으로 감압되도록 팽창시킨 후 상기 제3코일로 제공하는 팽창밸브와, 제2냉매유로 중 상기 제1코일의 타측에서 분기되어, 제3냉매유로 중 상기 제3코일의 타측과 연결하는 제1액냉매순환유로와, 제2냉매유로 중 상기 제3코일의 일측에서 분기되어, 제1냉매유로 중 상기 압축부의 토출측과 연결하는 제2액냉매순환유