Engine Air Flow
Another way to approach this may be to go back to the engine manufacturers' specifications. I don't have anything at my fingertips, but I recall seeing mass flow listed in engine specs.
Refrigeration
Going back to basics,
I Ton of Refrigeration = 12,000 Btu/hr (is 'British Thermal Unit' a yankee measurement ?)
1 Btu is the heat required to raise the temperature of 1 pound of water by 1 degree fahrenheit.