The International Space Station is equipped with a lot of electrical instruments and powerful computers as you can imagine, and if you are a gamer then you know how much heat computers can generate when they are working on full load. Now you can imagine how much heat The International Space Station generates and with no wind in the space, it is a challenge to keep it cool.
ISS uses radiators to cool itself down and emits heat into space. The station is equipped with ten large surfaces that serve the purpose.
All the systems at the station are connected to a coolant system. The coolant system links the heat load to a cold plate. Through the cold plate runs cold water, that collects all the heat through convection. The warm water is then cooled down using a box called Interface Heat Exchanger (IFHX). The water runs through coolant pipes that intersect the IFHX. Through the box also run ammonia filled coolant pipes. The heat from the water pipes is transferred to the ammonia pipes through conduction. The warmed up ammonia then flows out the station into the radiators that reject the heat thus cooling the ammonia. The same ammonia travels back to the IFHX, to pick up more heat completing the loop.