An aircraft galley air cooling system utilizes a controller having software
for regulating the temperature within food carts within a galley air
cooling unit. The cooling unit includes supply air and return air
temperature sensors which measure the temperature of the air entering and
exiting the food cart. The return air temperature is regulated by
controlling the amount of a liquid refrigerant that flows through a heat
exchanger within the cooling unit. If the return air temperature sensor
fails, then the controller regulates the supply air temperature. The
controller also regulates defrosting of the cooling unit.
