GB121005A - Means for Utilizing the Waste Heat in Electrical Machinery and Apparatus. - Google Patents

Abstract

121,005. Thompson, H. F. J., and Wood, T. H. Dec. 18, 1917. Heating liquids.-The heated air issuing from air-cooled dynamo-electric machines or other electrical machinery or apparatus is used to warm up boiler-feed water or other heat-absorbing medium of which the absorbed heat can be utilized. Tn the case of generating plant including a condensing steam engine or turbine, the condensate constitutes, wholly or in part, the heat-absorbing medium. In one form of heat utilizing plant, a totally-enclosed dynamo-electric generator 1, Fig. 1, is mounted upon a hollow foundation 2 of concrete &c. having openings 3, 4, 5 communicating with the interior of the generator. The heat-absorbing apparatus is contained within the foundation and comprises a multiple series of water tubes surrounded by passage ways communicating with the openings 3, 4, 5, the heated and cooled air of the machine 1 circulating in the directions shown by the arrows. The ends of the water tubes are secured in iron or steel plates 8, and the water is circulated in a zigzag manner through the tubes by the provision of other vertical and horizontal plates 9, 10, respectively. Boiler-feed water from a condenser enters through a pipe 11 and issues through a pipe 12 to the boiler Make-up cold water may be introduced through a pipe 13, and manual or automatic valves 14, 15 may be arranged in the pipes 11, 18. The automatic valves may be operated by an electric motor or the like 16 supplied with current from the leads 18 through a thermostat 17. The air for cooling the machine may be first compressed, then passed through a cooler, and afterwards expanded before entering the machine. In the case of the heat-utilizing apparatus becoming incapacitated, air-tight doors 19, 21, 22 may be provided, these doors being opened by hand or automatically for the circulation of atmospheric air in the usual manner. As shown, the doors may be controlled by solenoids having their windings in circuit with the leads 18. In the case of a motor driving hydraulic pumps &c., the water from the heat-utilizing apparatus after being heated by the hot air from the motor may be used to prevent freezing of the water pipes.