Umoya ocinezelweyo wondliwa kwi-pre-cooler (uhlobo lobushushu obuphezulu) ukwenzela ukutshabalalisa ubushushu, kwaye emva koko uqukuqela kutshintshiselwano lobushushu kutshintshiselwano lobushushu kunye nomoya obandayo okhutshwa kwi-evaporator, ukuze ubushushu bomoya ocinezelweyo ungene kwi-evaporator. i-evaporator ithotyiwe.