Compressor and cooling system

A cooling system comprising:

• a refrigerator using gas;
• and
• a compressor configured to compress the gas returned from the refrigerator and supply the gas to the refrigerator, wherein
• the compressor comprises:
• a heat exchanger configured to discharge heat generated during compression outside the compressor;
• a cooling liquid inlet port through which cooling liquid flowing from outside the compressor into the compressor passes;
• and
• a cooling liquid outlet port through which the cooling liquid flowing out of the compressor from inside the compressor passes, wherein
• the compressor is configured such that an operation mode is switchable between a first mode in which the cooling liquid passing through the cooling liquid inlet port flows in the heat exchanger in a predetermined first direction and passes through the cooling liquid outlet port, and a second mode in which the cooling liquid passing through the cooling liquid inlet port flows in the heat exchanger in a second direction opposite to the first direction and passes through the cooling liquid outlet port.