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TECHNICAL BRIEFS

# The Thermodynamic Performance Analysis of an Irreversible Space Solar Dynamic Power Brayton System and its Parametric Optimum Design

[+] Author and Article Information
Y. Zhang

Department of Physics, Xiamen University, Xiamen 361005, P.R.C.

J. Chen

Department of Physics, Xiamen University, Xiamen 361005, P.R.C.jcchen@xmu.edu.cn

J. Sol. Energy Eng 128(3), 409-413 (Feb 24, 2006) (5 pages) doi:10.1115/1.2212440 History: Received October 23, 2005; Revised February 24, 2006

## Abstract

A solar dynamic (SD) power system composed of a concentrating solar collector and an irreversible Brayton cycle system is set up, where the heat losses of the collector are dominated by the radiation, the heat transfer between the collector and the Brayton cycle system obeys Newton’s law, and the heat transfer between the Brayton cycle system and the ambient obeys the radiant heat transfer law. The cycle model is used to investigate synthetically the influence of the radiant heat losses of the collector, the finite-rate heat transfer, and the irreversible adiabatic processes in the Brayton cycle system on the performance of a space SD power Brayton system. The overall efficiency of the system and the other performance parameters are optimized. The optimal values of the important parameters and their corresponding upper or lower bounds are determined. Finally, the optimal performance of an endoreversible SD power Carnot system is simply derived.

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## Figures

Figure 1

(a) The schematic diagram and (b) the T-S diagram of a solar dynamic power system with the Brayton cycle

Figure 2

The ηh∼T2 curves, where the parameters (27-28)G=1.353KW∕m2, ε=0.1, τα=0.8, C=10, Th=800K, U1=20W∕K∕m2, and h=0.005. The solid and dashed lines indicate the performance characteristics of the Brayton and Carnot cycle systems, respectively.

Figure 3

The ηh∼Th curves, where the parameters G, ε, τα, C, U1, h are the same as those used in Fig. 2. The solid and dashed lines indicate the performance characteristics of the SD power Brayton and Carnot systems, respectively.

Figure 4

The ηmax∼x curves, where the parameters G, ε, τα, C, U1, h are the same as those used in Fig. 2

Figure 5

The Thopt∼x curves; the parameters are the same as those used in Fig. 4

Figure 6

The A1opt∕A curves, the parameters are the same as those used in Fig. 4

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