Abstract: [PROBLEMS]To provide a cooling system in which the efficiency of a refrigerator will not decrease in obtaining a predetermined temperature and humidity in a cooled room even when there is a change in the outside temperature and so on. [MEANS FOR SOLVING]An air conditioning system comprising a dehumidifier, a compressor into which a first air is introduced, a heat exchanger into which the first air compressed by the compressor is introduced, and an expander into which the first air heat-exchanged by the heat exchanger is introduced and which is connected with the compressor through a connection mechanism, wherein moisture content of a dehumidifying agent in the dehumidifier is decreased by a second air heat-exchanged with the first air by the heat exchanger.

Abstract: A mobile cold air supply unit which comprises, as housed in a single casing, an air compressor-expander constituted of an integral combination of a motor, an air compressor and an air expander, an air-to-water heat exchanger and an air-to-air heat exchanger, is furnished in the casing with air tubing for interconnecting the aforesaid components at an air pressure not higher than 5 kg/cm.sup.2, and is provided with a cold air discharge connection, a return air intake connection, a cooling water outlet connection and a cooling water intake connection.

Abstract: An air refrigerant ice forming equipment having formed therein a refrigeration cycle using air as a working medium, said refrigeration cycle comprising a passage for air circulation incorporating an air compressor, a compressed air cooler, an air expander and a heat exchanger for ice formation disposed in the indicated order along the flow of air characterized in that said equipment further comprises a heat exchanger for heat recovery wherein the air before entering the air expander is heat exchanged with the air which has passed through the heat exchanger for ice formation and that said air expander has a rotor caused to rotate by the action of air flowing through said passage for air circulation, a rotating shaft of said rotor is connected via a one-way clutch to a rotating shaft of a motor for driving said air compressor.

Abstract: A liner cooling construction for a gas turbine combustor or the like in which twisted or helical tapes in the spaces defined between the liner walls and the partition walls cause the cooling air to swirl so that the efficient cooling of the liner walls can be ensured.

Abstract: Disclosed is a concentration difference energy operated power plant comprising an aqueous solution tank containing an aqueous solution of slats, a pure water boiler disposed within the tank and completely immersed in the aqueous solution therein, preheater means for preheating the aqueous solution in the tank to a temperature very close to the boiling temperature thereof, and a steam engine which is operated by the steam generated in the pure water boiler, the steam discharged from the steam engine being injected through nozzles into the aqueous solution in the tank, dissipating the latent heat to the aqueous solution. Also disclosed is the compositions of the aqueous solutions used in conjunction with the above power plant.