https://doi.org/10.1140/epjp/s13360-022-03287-1
Regular Article
Thermal Brownian heat pump with external and internal irreversibilities
1
Institute of Thermal Science and Power Engineering, Wuhan Institute of Technology, 430205, Wuhan, China
2
Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment, 430205, Wuhan, China
3
School of Mechanical and Electrical Engineering, Wuhan Institute of Technology, 430205, Wuhan, China
b lingenchen@hotmail.com, 2506715339@qq.com
Received:
24
August
2022
Accepted:
15
September
2022
Published online:
23
September
2022
In this paper, an irreversible thermal Brownian heat pump cycle with external and internal irreversibilities is built. Expressions for heating load and coefficient of performance (COP) are derived by combining finite-time thermodynamics with non-equilibrium thermodynamics. By solving energy balance equations, the working temperatures and basic performance characteristics of cycle are obtained. The optimum performance and basic optimization relations between heating load and COP are studied by numerical calculations. The new performance characteristics are compared with those of existing Brownian heat pump models and irreversible macro Carnot heat pump, and the meanings of new cycle model are explained. The results indicate that the new cycle model is generalized, and it is a universal description for thermal Brownian heat pump cycles. The working temperatures of heat pump are optimum when the internal parameters and external heat transfer processes are optimized simultaneously. These irreversible losses will degrade the heat pump performance, COP has an extremum about heating load. Both heating load and COP have extremums about the thermal conductance ratios. The results are universal, which includes these results of Brownian heat pumps with different irreversibilities.
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