Development of Thermoelectric generating modules and system
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0886-F08-11.1
Development of Thermoelectric generating modules and system Toshinori Ota, Chieko Tokunaga, Kouichi Fujita Ishikawajima-Harima Heavy Industries Co., Ltd. (IHI) 1, Shin-Nakahara-cho, Isogo-ku, Yokohama 235-8501,Japan TEL; +81-45-2819 FAX; +81-45-759-2206 E-Mail; [email protected]
Abstract Ishikawajima–Harima Heavy Industries Co., Ltd. (IHI) is currently investigating applications of thermoelectric conversion systems based on the usage of radiant heat for industrial furnaces. The thermoelectric module units, which have been connected to a water-cooled jacket wall inside an electric resistance-heating-type industrial furnace, receive the heat originating from the in-furnace heat insulator by means of radiation, and collect the electric power based on the temperature difference. In this work, experimental results are presented, concerning the mechanical characteristics of a two-step cascade connection type module based on the heat transmission and thermoelectric conversion characteristic. The module performance analytic result, which turned character of several physical properties of the thermal radiation receiver of the upper part of modules, heat transmission characteristic, and the result, which performed the foundation examination for industrial furnace application, is reported. Introduction It is hoped to be able to adopt a power-generating system that employs a thermoelectric conversion system for industrial equipment, particularly in order to promote reduction in carbon dioxide emissions. Exhaust heat recovery has not been achieved, since it is a small-scale process, although the exhaust thermal energy from a resistance heating type industrial furnace is very large. In addition, it is usually equipment that consisting of a heat source and a cooling part. These industrial furnaces are designed so as to discharge heat by radiation into the water-cooled jacket. The heat insulator located in the furnace casing in order to maintain the high temperatures and to keep the thermal balance, need to be sufficiently thick so as to satisfy minimum requirements for the rise and the descent of the in-furnace temperature because of thermal capacity. Ishikawajima–Harima Heavy Industries Co., Ltd. (IHI) has developed an industrial furnace that includes a thermoelectric conversion system. In the system, a thermoelectricity conversion device collects radiated heat from the in-furnace. A thermoelectric module is connected with a water-cooled jacket wall, located inside of an electric resistance heating type industrial furnace, and the electric power is collected when a temperatures difference is established. [1-4] There are several characteristics pertaining to the application of a thermoelectric conversion system to industrial furnaces, as listed below. - The furnace is in either vacuum or sub-atmospheric conditions. - Especially, it is used in a quiet environment. - The heating and the cooling condition are gradual. - The thermoelectric conversion modules are positioned inside the furnace structure in a way s
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