Parameter Optimization of Geothermal Organic Rankine Cycle Power Generation System Based on Ton of Water Generation

doi:10.12096/j.2096-4528.pgt.24038

Abstract

Abstract:

Objectives Taking the net power generation per ton of water in the system as the analysis objective, study the variation trend of system performance parameters under different fluid temperatures of geothermal sources. Methods A 1 MW geothermal organic Rankine cycle model is established using EES software. The optimization objective is to study the thermodynamic performance parameters of four organic working fluids, R245fa, R1233zd (E), R134a, and R152a, at a heat source temperature of 90-150 ℃. Results Under the same heat source temperature, as the evaporation temperature of the working fluid increases, the net power generation per ton of water increases first to a maximum and then decreases for the system using different organic working fluids. Among them, the net power generation per ton of water of the working fluid R134a is the highest. When the heat source temperature is 110 ℃, the net power generation per ton of water is 3.06 kW⋅h/t. When the heat source temperature is between 90~150 ℃, the maximum net power generation per ton of water, working fluid evaporation temperature, system net efficiency, and expansion ratio of the power generation system increase with the increase of the ground heat source temperature. However, the mass flow rate of the working fluid decreases with the increase of the ground heat source temperature. Conclusions The research results can provide a basis for the thermodynamic parameter selection of a 1 MW geothermal dual cycle power generation system.

Key words: new energy, dual circulation system, geothermal power generation, organic working fluid, system optimization, organic Rankine cycle

CLC Number:

TK 123

Chao LIU, Liangde LIU, Tiancheng LIAN, Wei ZHAO, Xufei YANG, Guanglin LIU. Parameter Optimization of Geothermal Organic Rankine Cycle Power Generation System Based on Ton of Water Generation[J]. Power Generation Technology, 2025, 46(6): 1223-1230.

Figures/Tables 9

Fig. 1 Schematic diagram of geothermal ORC dual cycle power generation system

Fig. 2 Temperature entropy diagram of saturated geothermal dual cycle power generation system

Tab. 1 Properties of the selected organic working fluids

工质	临界温度/℃	临界压力/MPa	GWP	安全级别
R245fa	154.1	4.43	1 020	B1
R1233zd(E)	165.6	3.57	1	A1
R134a	101.1	4.06	1 300	A1
R152a	113.3	4.52	140	A2

Fig. 3 Net power generation per ton of water varying with evaporation temperature

Fig. 4 Relationship between the maximum net power generation per ton of water and geothermal sources temperature

Fig. 5 Relationship between the optimal evaporation temperature of the working fluid and heat source temperature

Fig. 6 Relationship between the system net efficiency and heat source temperature

Fig. 7 Relationship between the expansion ratio and heat source temperature

Fig. 8 Relationship between the mass flow rate of working fluids and heat source temperature

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