Abstract: The object of the invention is to provide a thermal complementary (combination of heat supply and heat discharge) system which can complement heat without the restriction of area of a region to be supplied with heat. An endless multiplex helical loop is formed to complement the heat produced in a region such as plants and regional facilities on a reciprocal basis, and the water is not circulated forcibly but achieves heat transfer in the helical loop.

Abstract: A lubricated steel material has a lubricating film on the steel surface. The film has good press formability, film removability, and blocking resistance, and possesses a high level of rust preventing properties in that it can prevent the steel material from rusting when kept in stacked or coiled conditions with no oil application. The lubricated steel material is produced by coating a steel material with a coating composition comprising from 74% to 97.7% by weight of an acrylic resin having an acid number of from 30 to 150 and a glass transition temperature of from 5 to 90° C., from 2% to 20% by weight of a water repellant, preferably one or more classes selected from the group consisting of carboxylic acid esters, metal soaps, polyethylene fine powder, and fluoroplastic fine powder, and from 0.

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.