Abstract: A heat exchanging system is provided for conditioning indoor temperature of a building. The heat exchanging system includes a magnetic refrigerator, an indoor heat exchanger and an outdoor heat exchanger. The indoor heat exchanger is thermally connected to the magnetic refrigerator. The outdoor heat exchanger is thermally connected to the magnetic refrigerator. The outdoor heat exchanger includes a geothermal heat exchanging unit, wherein the geothermal heat exchanging unit is embedded under the ground of a building.

Abstract: A heat exchanging system is provided for conditioning indoor temperature of a building. The heat exchanging system includes a magnetic refrigerator, an indoor heat exchanger and an outdoor heat exchanger. The indoor heat exchanger is thermally connected to the magnetic refrigerator. The outdoor heat exchanger is thermally connected to the magnetic refrigerator. The outdoor heat exchanger includes a geothermal heat exchanging unit, wherein the geothermal heat exchanging unit is embedded under the ground of a building.

Abstract: The present invention is to prevent heat exchange between sucked gas in a portion of a suction duct and hot gas within a casing, the portion of the suction duct extending in a closed casing. A gas compressed in a cylinder is introduced into an outer intermediate radiator, and the cooled compressed gas is refluxed to a closed casing through a return duct. A duplex connection duct which has an inner duct and an outer duct coaxially combined is connected to a connection end portion of the suction duct on the compressor side, the inner duct communicating to the suction duct whereas the outer duct communicates to the return duct. The return duct is connected to the outer duct on the outside of the closed casing, and this outer duct is formed open at one end in the inside of the closed casing.

Abstract: A refrigerating cycle apparatus has, in a sealed casing, a compressor including first and second compressor means driven simultaneously. A refrigerating cycle circuit is constituted by connecting this compressor, a condenser, a pressure-reducing device, and an evaporator. Counterflow checking means is provided on the suction side of the first compressor means, for checking the counterflow of the refrigerant from the first compressor means to the evaporator. Switching means is provided on the discharge side of the second compressor means.

Abstract: A fluid compressing apparatus includes a casing, a compressing unit disposed in the casing, a motor-drive unit located in the casing for driving the compressing unit, and a bearing unit for rotatably supporting the rotational shaft of the motor-drive unit. The fluid compressing apparatus also includes a refrigerant of HFC-134a (CH.sub.2 FCF.sub.3) and a prescribed amount of polyglycol, as a lubricating oil, stored in the casing. The bearing unit and the rotational shaft satisfy the following relationship:C2.ltoreq.2.times.Sowherein C2 is a gap between the rotational shaft and the bearing unit in a radial direction, and So is a total surface roughness of the outer surface of the rotational shaft and the inner surface of the bearing unit.