Optimization Analysis of a Combined Ejector-cooling and Power System

doi:10.12096/j.2096-4528.pgt.21015

Abstract

Abstract:

With the development of society, severe energy situation, as well as higher and higher environmental protection requirements, how to improve energy efficiency and achieve sustainable development of society has become the research goal of more and more scholars. The cascade utilization based on energy grade and multi-energy complementary distributed energy system are the important development direction of energy technology in the future. One of them is the combined cooling and electricity cycle, which combines the organic Rankine cycle with the ejector refrigeration cycle. The ejector is the key component in the combined cycle of cooling and electricity. The ejector was modeled by the most commonly used one-dimensional isobaric mixing model. The thermal efficiency and exergy efficiency of the cycle were analyzed. The effects of condensation temperature, evaporation temperature, outlet temperature of steam generator and exhaust pressure on the cycle performance were analyzed. The analysis of the system shows that the greatest loss occurs in steam generator, condenser and ejector.

Key words: combined cooling and power cycle, ejector, thermodynamic analysis, thermal efficiency, exergy efficiency

CLC Number:

TK 121

Yuxing WANG, Yanjie ZHAO, Zhanye YANG, Hurun ZHANG, Manni LIN. Optimization Analysis of a Combined Ejector-cooling and Power System[J]. Power Generation Technology, 2022, 43(6): 942-950.

Figures/Tables 13

Fig. 1 Diagram of combined ejector-cooling and power cycle

Fig. 2 T-s diagram of combined ejector-cooling and power cycle

Fig. 3 Flow chart of calculation

Tab. 1 Cycle simulation parameter input

循环参数	设定值
热源入口温度/℃	300
热源出口温度/℃	50
热源压力/kPa	101.35
蒸汽发生器工质出口温度/℃	200
蒸汽发生器工作压力/kPa	2 000
汽轮机排气压力/kPa	1 500
汽轮机等熵效率	0.8
工质泵等熵效率	0.7
喷管等熵效率	0.8
混合室等熵效率	0.95
扩压管等熵效率	0.8
冷冻水入口温度/℃	12
冷冻水出口温度/℃	7

Fig. 4 Effect of condensation temperature on cycle performance

Fig. 5 Effect of condensation temperature on the mass flow rate of primary and secondary fluids

Fig. 6 Change of condensation temperature with exergy destruction for each component

Fig. 7 Change of evaporation temperature with thermal efficiency and exergy efficiency

Fig. 8 Change of evaporation temperature with exergy destruction for each component

Fig. 9 Change of generator outlet temperature with thermal efficiency and exergy efficiency

Fig. 10 Change of generator outlet temperature with exergy destruction for each component

Fig. 11 Change of discharge pressure with thermal efficiency and exergy efficiency

Fig. 12 Change of discharge pressure with exergy destruction for each component

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