Performance optimization of a class of combined thermoelectric heating devices
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rformance optimization of a class of combined thermoelectric heating devices 1,2*
CHEN LinGen 1
3
1,2
1,2
, MENG FanKai , GE YanLin , FENG HuiJun
& XIA ShaoJun
1,2
Institute of Thermal Science and Power Engineering, Wuhan Institute of Technology, Wuhan 430205, China; 2 School of Mechanical & Electrical Engineering, Wuhan Institute of Technology, Wuhan 430205, China; 3 College of Power Engineering, Naval University of Engineering, Wuhan 430033, China
Received October 25, 2019; accepted December 31, 2019; published online October 27, 2020
A detailed model of thermally-driven combined thermoelectric (TE) heating device is established. The device consists of twostage TE heat pump (TTEH) and two-stage TE generator (TTEG) with four external heat exchangers (HEXs). Both internal losses and external heat transfer irreversibilities are considered in the model. The heating capacity and the coefficient of performance (COP) of the device are improved through numerical optimization, which is of great significance to the application of the device. The distribution of the total TE element number among four TE devices and the distribution of the total external heat conductance among the four external HEXs are optimized. The results show that both the reservoir temperatures of TTEG and TTEH have significant influences on the performance and the corresponding optimum parameters of the device. The COP can reach 0.14 after optimization when the temperature difference of heat source is 150 K and the temperature difference of heating is 10 K. thermoelectric generator, thermoelectric heat pump, combined thermoelectric device, heat transfer, finite time thermodynamics, performance optimization Citation:
Chen L G, Meng F K, Ge Y L, et al. Performance optimization of a class of combined thermoelectric heating devices. Sci China Tech Sci, 2020, 63, https://doi.org/10.1007/s11431-019-1518-x
1 Introduction Seebeck effect and Peltier effect provide a theoretical basis for the applications for thermoelectric (TE) power generation and refrigeration [1]. With the increasingly serious environmental pollution and energy crisis, it is of great practical significance to study the performances TE devices. The non-equilibrium thermodynamics (NET) is basic theory to study the thermodynamic performance of TE generators (TEG), TE refrigerators (TER) and TE heat pumps (TEH). Single stage TER can reach a temperature difference of about 70 K. It cannot achieve larger temperature difference, and the coefficient of performance (COP) rapidly decreases *Corresponding author (email: [email protected], [email protected])
when it works with a large temperature difference. Therefore, in order to achieve larger temperature difference, twostage or multi-stage TER is used. A large number of scholars have studied the two-stage TE generators (TTEG) [2–6], two-stage TE refrigerators (TTER) [7–17] and two-stage TE heat pumps (TTEH) [18] by using the NET theory. However, these studies did not give enough attention to the external heat transfer (HT) of TE dev
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