Air conditioner for communication equipment and controlling method thereof

1. An air conditioner for communication equipment comprising: an indoor module located inside a base station in which communication equipment is installed, and having a storage tank in which cooling water is stored, a pair of circulation pumps which are installed in parallel on a cooling water pipe extending from an outlet of the storage tank to circulate cooling water in the storage tank, an indoor heat exchanger which is installed on the cooling water pipe extending from outlets of the pair of circulation pumps, and an indoor blower which is positioned adjacent to the indoor heat exchanger; and an outdoor module located outside the base station, and having an outdoor heat exchanger which is installed on the cooling water pipe extending from an outlet of the indoor heat exchanger, an outdoor blower which is positioned adjacent to the outdoor heat exchanger, and a pair of cooling units which are installed in series on the cooling water pipe extending from an outlet of the outdoor heat exchanger, wherein each cooling unit of the outdoor module includes a compressor for compressing a refrigerant used in the cooling unit, a condenser which communicates with the compressor through a refrigerant pipe, a receiver dryer which communicates with the condenser through the refrigerant pipe, a heat exchanger through which a heat exchange tube communicating with the cooling water pipe passes, and an expansion valve which is installed on the refrigerant pipe between the receiver dryer and the heat exchanger.

2. The air conditioner according to claim 1 , wherein an indoor temperature sensor is installed inside the base station, an outdoor temperature sensor is installed outside the base station, and a cooling water temperature sensor is installed on the cooling water pipe at a threshold of the outdoor module.

3. A method for controlling the air conditioner for communication equipment according to claim 2 , divided into a method for controlling the indoor heat exchanger and the cooling units and a method for controlling the outdoor heat exchanger, the method for controlling the indoor heat exchanger and the cooling units comprising: a first step of measuring an indoor temperature using the indoor temperature sensor; a second step of determining whether the indoor temperature is lower than a first reference temperature, and turning off the entire air conditioner when the indoor temperature is lower than the first reference temperature or turning on the indoor heat exchanger when the indoor temperature is higher than or equal to the first reference temperature; a third step of determining whether the indoor temperature is higher than or equal to the first reference temperature and is lower than a second reference temperature, and returning to the first step when the indoor temperature is higher than or equal to the first reference temperature and is lower than a second reference temperature or turning on one of the first and second cooling units and the indoor heat exchanger when the indoor temperature is higher than or equal to the second reference temperature; a fourth step of determining whether the indoor temperature is higher than or equal to the second reference temperature and is lower than a third reference temperature, and returning to the first step when the indoor temperature is higher than or equal to the second reference temperature and is lower than the third reference temperature; a fifth step of turning on both first and second cooling units and the indoor heat exchanger when the indoor temperature is higher than or equal to the third reference temperature; and a sixth step of determining whether the indoor temperature is lower than the third reference temperature, and returning to the first step when the indoor temperature is lower than the third reference temperature or returning to the fifth step when the indoor temperature is higher than or equal to the third reference temperature, and the method for controlling the outdoor heat exchanger comprising: a first step of separately measuring an outdoor temperature and a cooling water temperature respectively using the outdoor temperature sensor and the cooling water temperature sensor; a second step of determining whether the outdoor temperature is lower than the cooling water temperature; a third step of turning on the outdoor heat exchanger when the outdoor temperature is lower than the cooling water temperature; and a fourth step of turning off the outdoor heat exchanger when the outdoor temperature is higher than or equal to the cooling water temperature.

4. The method according to claim 3 , wherein the method for controlling the outdoor heat exchanger further comprises the step of: after the second step, determining whether the cooling water temperature is lower than 5<0>C, and turning off the outdoor heat exchanger when the cooling water temperature is lower than 5<0>C or turning on the outdoor heat exchanger when the cooling water temperature is higher than or equal to 5<0>C.

5. The method according to claim 3 , wherein the method for controlling the outdoor heat exchanger further comprises the step of: after the second step, determining whether the cooling water temperature is lower than 5<0>C, and turning off the outdoor heat exchanger when the cooling water temperature is lower than 5<0>C, returning to the first step of the corresponding method when the cooling water temperature is higher than or equal to 5<0>C and is lower than 1O<0>C, or turning on the outdoor heat exchanger when the cooling water temperature is higher than or equal to 1O<0>C.

6. A method for controlling the air conditioner for communication equipment according to claim 1 , divided into a method for controlling the indoor heat exchanger and the cooling units and a method for controlling the outdoor heat exchanger, the method for controlling the indoor heat exchanger and the cooling units comprising: a first step of measuring an indoor temperature using the indoor temperature sensor; a second step of determining whether the indoor temperature is lower than a first reference temperature, and turning off the entire air conditioner when the indoor temperature is lower than the first reference temperature or turning on the indoor heat exchanger when the indoor temperature is higher than or equal to the first reference temperature; a third step of determining whether the indoor temperature is higher than or equal to the first reference temperature and is lower than a second reference temperature, and returning to the first step when the indoor temperature is higher than or equal to the first reference temperature and is lower than a second reference temperature or turning on one of the first and second cooling units and the indoor heat exchanger when the indoor temperature is higher than or equal to the second reference temperature; a fourth step of determining whether the indoor temperature is higher than or equal to the second reference temperature and is lower than a third reference temperature, and returning to the first step when the indoor temperature is higher than or equal to the second reference temperature and is lower than the third reference temperature; a fifth step of turning on both first and second cooling units and the indoor heat exchanger when the indoor temperature is higher than or equal to the third reference temperature; and a sixth step of determining whether the indoor temperature is lower than the third reference temperature, and returning to the first step when the indoor temperature is lower than the third reference temperature or returning to the fifth step when the indoor temperature is higher than or equal to the third reference temperature, and the method for controlling the outdoor heat exchanger comprising: a first step of separately measuring an outdoor temperature and a cooling water temperature respectively using the outdoor temperature sensor and the cooling water temperature sensor; a second step of determining whether the outdoor temperature is lower than the cooling water temperature; a third step of turning on the outdoor heat exchanger when the outdoor temperature is lower than the cooling water temperature; and a fourth step of turning off the outdoor heat exchanger when the outdoor temperature is higher than or equal to the cooling water temperature.

7. The method according to claim 6 , wherein the method for controlling the outdoor heat exchanger further comprises the step of: after the second step, determining whether the cooling water temperature is lower than 5<0>C, and turning off the outdoor heat exchanger when the cooling water temperature is lower than 5<0>C or turning on the outdoor heat exchanger when the cooling water temperature is higher than or equal to 5<0>C.