Volume 18, Issue 2 (4-2018)
Modares Mechanical Engineering 2018, 18(2): 61-72 |
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Ghasemkhani A, Farahat S, Naserian M M. Performance analysis and optimization Tri-Generation system using Finite-Time Thermodynamics concepts. Modares Mechanical Engineering 2018; 18 (2) :61-72
URL: http://mme.modares.ac.ir/article-15-722-en.html
URL: http://mme.modares.ac.ir/article-15-722-en.html
1- Department of Mechanical Engineering, Faculty of Engineering, University of Sistan and Bluchestan, Zahedan, Iran
2- Mechanical Engineering DepartmentUniversity of Sistan and Baluchestan987-98155, Zahedan, Iran.
2- Mechanical Engineering DepartmentUniversity of Sistan and Baluchestan987-98155, Zahedan, Iran.
Abstract: (5956 Views)
In this paper, performance analysis and optimization of a trigeneration system based on different thermodynamic criteria such as energy and exergy efficiency, power and dimensionless power have been investigated. The trigeneration system consists of three subsystems which including the solar subsystem, Kalina subsystem and lithium bromide-water absorption chiller subsystem. The proposed system uses solar energy generates power, cooling and domestic water heating. Power is introduced as a tool for understanding thermodynamic concepts of limited time. Dimensionless power is defined as the ratio of power to the product of total thermal conductivity and minimum temperature of the system. Dimensionless power can be used as a tool to understand the concepts of finite time thermodynamics. The exergy analysis has shown that the most exergy destruction is related to boiler. As a result, energy and exergy efficiencies, capital cost rates and dimensionless power are 17.77%, 18.82% and 9.63 dollars per hour, 0.01781 respectively. Sensitivity analysis has shown that increasing parameters such as ambient temperature, solar radiation, the dimensionless mass flow rate of the Kalina cycle, collector inlet temperature and pressure ratio of the Kalina cycle increase energy and exergy efficiencies. Also increasing pressure ratio the of Kalina Cycle, reducing the dimensionless mass flow rate of the Kalina cycle, the ambient temperature and collector inlet temperature has led to increased dimensional power. In addition, the optimization criteria such as energy efficiency, exergy efficiency, power and dimensional power have been compared. The results showed that power and dimensional power are the best thermodynamic optimization criteria.
Article Type: Research Article |
Subject:
Thermodynamics
Received: 2017/12/9 | Accepted: 2018/01/8 | Published: 2018/01/23
Received: 2017/12/9 | Accepted: 2018/01/8 | Published: 2018/01/23
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