Effect of heat transfer on the performance of a thermoelectric heat pump driven by a thermoelectric generator
Lingen Chen*, Fankai Meng, and Fengrui Sun
Postgraduate School, Naval University of Engineering, Wuhan 430033, P.R. China.
*. To whom all correspondence should be addressed:
Fax: 0086–27–83638709; ]]>
Tel: 0086–27–83615046,
e–mail: lgchenna@yahoo.com ; lingenchen@hotmail.com
Recibido el 13 de enero de 2009
Aceptado el 9 de junio de 2009
Abstract
A model of a thermoelectric heat pump driven by a thermoelectric generator with external heat transfer irreversibility is proposed. The performance of the combined thermoelectric heat pump device obeying Newton's heat transfer law is analyzed using the combination of finite time thermodynamics and non–equilibrium thermodynamics. Two analytical formulae for heating load versus working electrical current, and the coefficient of performance (COP) versus working electrical current, are derived. For a fixed total heat transfer surface area of four heat exchangers, the allocations of the heat transfer surface area among the four heat exchangers are optimized for maximizing the heating load and the COP of the combined thermoelectric heat pump device. For a fixed total number of thermoelectric elements, the ratio of the number of thermoelectric elements of the generator to the total number of thermoelectric elements is also optimized for maximizing both the heating load and the COP of the combined thermoelectric heat pump device. The influences of thermoelectric element allocation and heat transfer area allocation are analyzed by detailed numerical examples. The optimum working electrical currents for maximum heating load and maximum COP at different total numbers of thermoelectric elements and different total heat transfer areas are provided, respectively.
Keywords: Combined thermoelectric device; thermoelectric generator; thermoelectric heat pump; heat transfer; finite–time thermodynamics; non–equilibrium thermodynamics.
]]> Resumen
En el presente trabajo se propone un modelo de una bomba de calor termoeléctrica controlada por un generador termoeléctrico con transferencia de calor externa irreversible. Se analiza el desempeño de la bomba de calor combinada, la cual obedece a la ley de Newton de transferencia de calor, usando la combinación de termodinámica de tiempo finito y termodinámica fuera de equilibrio. Se obtienen dos formulas analíticas: para la carga de calor y para el coeficiente de desempeño, ambas en función del trabajo de corriente eléctrica. Se realiza una optimización de la posición de la superficie de transferencia de calor entre cuatro intercambiadores para maximizar la carga de calor y el coeficiente de desempeño de la bomba de calor termoeléctrica combinada. Para este mismo fin, se optimiza también la razón entre el número de elementos termoeléctricos del generador y el total. Se analiza, mediante ejemplos numéricos detallados, la influencia entre las posiciones del elemento termoeléctrico y del área de transferencia de calor.
Descriptores: Dispositivo termoeléctrico combinado; generador termoeléctrico; bomba de calor termoeléctrica; transferencia de calor; termodinámica de tiempo finito; termodinámica fuera de equilibrio.
PACS: 05.30–d; 05.70.–a; 05.60.Gg
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Acknowledgements
This paper is supported by the Program for New Century Excellent Talents at the University of P. R. China (Project No. NCET–04–1006) and The Foundation for the Author of National Excellent Doctoral Dissertation of P.R. China (Project No. 200136). The authors wish to thank the reviewers for their careful, unbiased and constructive suggestions, which led to this revised manuscript.
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