IMPROVING DIRECT CONVERSION EFFICIENCY MECHANICAL ENERGY INTO HEAT
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Abstract
In connection with the improvement of the technical characteristics of the produced permanent magnets, they began to be often used in generating electricity and also for converting mechanical energy into thermal energy. In this paper, devices for direct conversion of mechanical energy into thermal energy of the induction type with permanent magnets are considered, the reasons for the low conversion efficiency are analyzed, and a search is made for ways to increase the efficiency of these devices. One of the reasons is the presence of air gaps in the magnetic circuits of such converters. The study of the influence of the values of air gaps on the change in magnetic fluxes in an unbranched magnetic circuit with a constant MDF has been carried out, and an approximate dependence Φ= f(δ) has been obtained, which makes it possible to quantitatively assess the degree of this influence. A design diagram of a device for direct conversion of mechanical energy into thermal energy of induction type with air heat exchange has been developed, in which air gaps in magnetic circuits are excluded in order to increase the conversion efficiency.
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References
Mamonov, V. N., Mis'kiv, N. B., Nazarov, A. D., Serov, A. F., & Terekhov V. I. (2019) Generatsiya tepla v mul'titsilindrovoi sisteme Kuetta – Teilora [Heat generation in a multi-cylinder Couette – Taylor system]. Teplofizika i aeromekhanika [Thermophysics and Aeromechanics], 26(5), 729–739. (In Russ.).
Nouri-Borujerdi, A., & Nakhchi M. E. (2017) Heat transfer enhancement in annular flow with outer grooved cylinder and rotating inner cylinder: Review and experiments. Applied Thermal Engineering, (120), 257–268.
Akhmadeev, R. V., Vavilova, I. V., Grakhov, P. A., & Krymskaya, T. M. (2009) Elektrotekhnika i elektronika. Elektricheskie i magnitnye tsepi [Electrical and Electronics. Electrical and magnetic circuits]. Ufa: Ufimskii gosudarstvennyi aviatsionnyi tekhnicheskii universitet. (In Russ.).
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