Abstract: Fluid to be conditioned is admitted to first passageways of a heat exchanger and thereafter to a point of use, traversing flow conducting means which include the second passageways of the heat exchanger and fluid conditioning means which reduces the energy level of the fluid admitted to the second passageways below the energy level of the fluid admitted to the first passageways so as to increase the energy level of the fluid flowing through the second passageways by heat exchange with the fluid flowing through the first passageways.

Abstract: An open loop air cycle air conditioning system draws ambient air into a turbine for expansion and cooling. The air passes through a heat exchanger where it withdraws heat from recirculated cabin air and is passed to a compressor which is operatively coupled to and driven by the turbine to partially recompress the air. The air is directed from the compressor to the intake manifold of the airplane engine. Valves may be positioned at the ambient air inlet to control the flow of air through the air conditioning system and into the engine. Water can be sprayed into the low pressure air at the heat exchanger to provide substantial additional cooling by evaporation.

Abstract: After the intake air for a vehicle's internal combustion type propulsion engine has been throttled down to about the intake manifold pressure, water is sprayed into the air. This air passes through the primary side of an air-to-air heat exchanger so that the vaporization of the water will remove heat from the air passing through the secondary side of the heat exchanger. This cooled air is circulated through an enclosure of the vehicle to provide low cost, low power cooling for the occupants thereof.