Thermodynamic and economic analysis of novel system combined cooling, heating and power driven by geothermal energy

被引：0
|
作者：
Dong S. [1 ]
Teng M. [2 ]
Pan Z. [1 ]
Zhang L. [1 ]
Shang L. [3 ]
Li P. [3 ]
机构：
[1] College of Petroleum Engineering, Liaoning Shihua University, Fushun
[2] PetroChina West Pipeline Xinjiang Oil and Gas Branch, Urumqi
[3] College of Chemical Engineering, Liaoning Shihua University, Fushun
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2021年 / 42卷 / 05期
关键词：
Absorption refrigeration; Ammonia-water mixture; Geothermal energy; Kalina cycle; Thermodynamic;
D O I：
10.19912/j.0254-0096.tynxb.2019-0121
中图分类号：
学科分类号：
摘要：
Aiming at the cascade utilization of geothermal energy, a novel system combined cooling, heating and power which combined flash-Kalina power generation cycle and absorption refrigeration cycle is proposed using geothermal water at 170℃ as the heat source, and the feasibility and superiority of the system are verified. The thermodynamic and economic calculations of the system are carried out, and the effects of key parameters such as evaporation pressure, ammonia concentration and split ratio on the thermodynamic performance of the system are analyzed in detail. The results show that the thermal efficiency of the system can be increased by increasing the ammonia concentration and the inlet pressure of the turbine in the Kalina cycle. The net power generation and exergy efficiency of the flash-Kalina cycle part have optimal values when the flash pressure is 0.3 MPa, which are 601 kW and 43.9%, respectively. The ammonia concentration required to safe operation of the system ranges from 0.89 to 0.68. The coefficient of performance (COP) of the absorption refrigeration system is proportional to the inlet temperature of the fractionating column. The total exergy efficiency of the system decreases first and then increases with the increase of the split ratio at the outlet of the condenser. The results obtained through the economic analysis show that the steam turbine is the component with the largest investment cost. A higher split ratio can reduce the payback period of the system investment. © 2021, Solar Energy Periodical Office Co., Ltd. All right reserved.
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页码：1 / 9
页数：8
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