How does the Frigoboat keel cooler work?
The keel cooler condenser fitting has two copper tubes projecting from it, & these are connected together through a cupro-nickel loop that is cast into the sintered bronze. Through the action of the compressor, the hot, high pressure refrigerant gas is circulated through the keel cooler where it is cooled & condensed into a cool, high pressure liquid that is then fed to the evaporator (the part that is in the insulated box). Here it is subjected to a large pressure drop & evaporates (boils) at a very low temperature before being fed back to the compressor as a cool, low-pressure gas.
