Performance Analysis of Solar Driven Heat Engine with Internal Irreversibility With Consideration to Power Density

Abstract

Finite time thermodynamic optimizations based on the maximum power density has been performed for a solar-driven heat engine with internal irreversibility. In the analysis, it is assumed that the heat transfer from the hot reservoir is to be in the radiation mode and the heat transfer to the cold reservoir is to be in the convection mode. The power density function has been derived, and maximization of this function has been performed for various design parameters & their effects on optimum power densities have been investigated. The performance in the nominal power density output at operating conditions other than optimum working fluid temperatures has been studied with respect to the obtained efficiency.

Keywords

• Solar driven heat engine, Performance Analysis, Internal irreversibility, Power density, thermal efficiency

References

1. Chambadal P. Les Centrales Nuclearies. Paris: Armond Colin; 1957. p. 41–58.
2. Novikov II. The efficiency of atomic power stations (a review). Atom Energy 1957; 3(11):409.
3. Curzon Fl, Ahlborn B. Efficiency of a Carnot engine at maximum power output. Am J Phys 1975; 43:22–4.
4. Bejan A. Entropy generation minimization: the new thermodynamics of .nite-size devices and finite-time processes. Appl Phys Rev 1996;79:1191–218.
5. Goktun S, Ozkaynak S, Yavuz H. Design parameters of a radiative heat engine. Energy 1993; 18:651–5.
6. Ozkaynak S. Maximum power operation of a solar powered heat engine. Energy 1995; 20:715–21.
7. Erbay LB, Yavuz H. An analysis of an endoreversible heat engine with combined heat transfer. J Phys D:Appl Phys 1997; 30:2841–7.
8. Badescu V. Optimum design and operation of a dynamic solar power system. Energy Convers Manage 1996; :151–60.

9. Wu C. Power optimization of an endoreversible Brayton gas turbine heat engine. Energy Convers Mgmt ;31:561–5. Chen J, Wu C. General performance characteristics of an n-stage endoreversibe combined power cycle at maximum speci.c power output. Energy Convers Mgmt ;37:1401–6.
10. Chen J, Wu C, Kiang RL. Maximum speci.c power output of an irreversible radiant heat engine. Energy Convers Mgmt 1996;37:17–22.
11. Sahin AZ. Optimum operating conditions of solar driven heat engines. Energy Convers Manage 2000; :1335–43.
12. Sahin B, Kodal A, Yavuz H. Maximum power density for an endoreversible Carnot heat engine. Energy ;21:1219–25.
13. Sahin B, Kodal A, Yavuz H. E.ciency of Joule– Brayton engine at maximum power density. J Phys D: Appl Phys 1995;28:1309–13.
14. Sahin B, Kodal A, Yýlmaz T, Yavuz H. Maximum power density analysis of an irreversible Joule–Brayton engine. J Phys D: Appl Phys 1996;29:1162–7.
15. Koyun A. Performance analysis of a solar driven heat engine with external irreversibilities under maximum power and power density condition. Energy Convers Manage 2004; 45:1941–7.