Abstract: A cooling device for an internal combustion engine has an additonal water pump and a bypass conduit which bypasses the additional water pump. When the amount of heat radiation of the radiator is insufficient, the additional water pump is driven by an electric motor. When the additional water pump is not necessary, the bypass conduit is opened, so that the cooling fluid bypasses the additional pump.

Abstract: A heat exchanger such as used as an inter cooler for cooling an intake air of an internal combustion engine has an inner fin which is provided within a tube through which heat transfer medium such as an intake air flows. The inner fin has a plurality pairs of a first vertical wall portion and a second vertical wall portions, a first horizontal wall portion connecting an upper end of the first vertical wall portion to an upper end of the second vertical wall portion, and a second horizontal wall portion connecting a lower end of the first vertical wall portion to a lower end of the second vertical wall portion. The inner fin further has a plurality of slits formed from the vertical wall portion side of the first horizontal wall portion via entire length of the vertical wall portion until the vertical wall portion side of the second horizontal wall portion. The fin pitch P, the length L of vertical wall portion between adjacent pair of the slits, and the width S of the slit are as follows.1.6 mm.ltoreq.P.

Abstract: A humidity conditioner comprising a moisture absorber and a heating element attached to or embedded in the moisture absorber. The moisture absorber includes a porous material having continuous fine interstices, and a hygroscopic filler filling the interstices.

Abstract: A moisture remover and a moisture removing apparatus which comprise a porous body and moisture-absorbing fillers basically. The porous body has continuous fine voids having a mean hole-diameter of 10 microns or less and a hollow portion therein to take out moisture and/or water. The moisture removing apparatus further comprises suction pump means for facilitating drawing of the moisture and/or the water.

Abstract: A hygroscopic composite material comprising a humidity absorbing body having hygroscopic fillers in its basic material and a porous body having many micropores. This hygroscopic composite material retains its hygroscopicity for a long period of time by enhancing its humidity absorbing function by generating free water in the porous body and by discharging the free water.

Abstract: An abrasion resistant aluminum alloy characterized in that the aluminum alloy has a chemical composition basically containing 7.5-15 wt % of Si, 3.0-6.0 wt % of Cu, 0.3-1.0 wt % of Mg, 0.25-1.0 wt % of Fe, 0.25-1.0 wt % of Mn, and the balance of Al and impurities, and an alloy structure with a primary Si crystal size smaller than 80 microns, a Si-Mn-Fe compound grain size smaller than 120 microns, and an alpha-Al phase size smaller than 100 microns.