Exergoeconomic optimization and environmental analysis of a novel solar-trigeneration system for heating, cooling and power production purpose (original) (raw)
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Exergoeconomic assessment, parametric study and optimization of a novel solar trigeneration system
International Journal of Renewable Energy Research, 2016
An exergoeconomic analysis is performed for a solar trigeneration system in which the electric power, refrigeration power and domestic hot water are produced by a cascade organic Rankine cycle, an absorption chiller, which is accompanied by ammonia turbine, and a heat recovery cycle respectively. A parametric study is also carried out to investigate the effects of such significant parameters as degree of superheat at the turbine’s inlet of power cycle, condenser temperature of power cycle, operating pressure of the refrigerating cycle and operating fluid temperature of the main cycle on the energy and exergy efficiencies and the exergoeconomic performance of the system. Finally a multi objective optimization from the viewpoint of exergoeconomics is reported by using genetic algorithm. As a result of exergoeconomic analysis of the system, ORC Heat Exchanger (ORC Ex), Cooling Tower2 (C.T2), Absorber (Abs) and Reflux Condenser (Ref Cond) exhibit the worst exergoeconomic performance. Fo...
SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems, 2019
An exergy cost assessment of solar trigeneration plant to generate electricity, freshwater , and heat is carried out in order to study the process of exergy cost formation, to determine the key components that contribute to the cost of each product, and to establish the best configuration in term of unit exergy cost. The solar trigeneration plants evaluated consist of a concentrated solar power (CSP), a multi-effect distillation plant, and a process heat module, in which the CSP plant is the prime mover. The methodology includes modeling and evaluating the performance of standalone and trigeneration plants using the symbolic exergoeconomic methodology. Results show that the best configuration, in terms of exergy cost, is when the multi-effect distillation plant replaces the power cycle condenser. Regarding the costs formation, the key components which could be improved in their design are: solar collectors, evaporator, re-heater, dissipative systems, and productive subsystems.
2018
In this research, the thermodynamic investigation of the tri-generation system is performed by the first and second law of Thermodynamics. The trigeneration system under study consists of three subsystems including the solar subsystem, Kalina subsystem and lithium bromide-water absorption chiller subsystem. The proposed system generates power, cooling and hot water using solar energy. The system considered is designed and evaluated based on the climate condition in Zahedan, Iran. The calculation results show that the most exergy destruction rate takes place in the solar cycle. The assessment of system is used dynamic and static forms. In dynamic form, that maximum total cost rate, energy and exergy efficiency are equal to 15.1 dollars per hour,by 33% and 36.47%, respectively. The results base-case demonstrate that energy and exergy efficiencies and total cost rates are equal to 9.63 dollars per hour by 17.37% and 18.82% , respectively in static analysis. Furthermore, optimization cr...
Applied Thermal Engineering, 2012
In the present study, exergoeconomic optimization of a trigeneration system for cooling, heating and power purposes has been carried out. The system is made up of air compressor, combustion chamber, gas turbine, dual pressure heat recovery steam generator and absorption chiller in order to produce cooling, heating and power. The design parameters of this study are selected as: air compressor pressure ratio, gas turbine inlet temperature, pinch point temperatures in dual pressure heat recovery steam generator, pressure of steam that enters the generator of absorption chiller, process steam pressure and evaporator of the absorption chiller chilled water outlet temperature. The economic model used in this research is according to the total revenue requirement (TRR) and the cost of the total system product was defined as our objective function and optimized using a Genetic Algorithm technique. Results of exergoeconomic optimization are compared with corresponding features of the base case system. It has seen that objective function was modified about 15 percent after optimization. Furthermore, a sensitivity analysis has been presented in order to investigate the effects of decision variables on the different objective functions. Decision makers may find the methodology explained in this paper, very useful for optimal comparison and selection of trigeneration systems.
Exergoeconomic analysis of a combined solar-waste driven power plant
Renewable Energy, 2019
In this work, a thorough exergoeconomic analysis of a hybrid solar-waste driven power plant is presented. The objective is to give a clearer picture of the main irreversibilities, their corresponding costs and to find some effective yet feasible solutions to improve the efficiency and cost-effectiveness of the power plant. For this, the power plant is exergetically modeled, the exergoeconomic assessment is accomplished, the exergy losses are weighted, the cost of these losses are estimated and finally, the solutions are given. The cost of electricity was improved from 0.202 US$/MJ to 0.137 US$/MJ, after the application of the recommendations. Results show that electricity cost decreases in daily hours from a maximum of 10% in winter to the maximum of 26% in summer. Furthermore, the results of sensitivity analysis on the plant indicates that a hybrid cycle with turbine isentropic efficiency of 0.85, steam extraction ratio of 0.36 and inlet turbine temperature of 400 ℃ offers a 32% lower electricity cost compared to a cycle with a turbine isentropic efficiency of 0.75, steam extraction ratio of 0.16 and inlet turbine temperature of 500 ℃.
Exergoeconomic optimization of tetra-combined trigeneration system
This work aims at obtaining optimal configurations of trigeneration systems in order to satisfy required demands for electricity and thermal loads for heating and cooling, evaluating the impact of the electricity, steam and chilled water production costs. A trigeneration system produces electricity, heat and cooling effect using electricity or heat available. Emphasis is made on systems using absorption chillers, including one using a hybrid absorption ejecto-compression chiller, here called tetra-combined trigeneration system. The performance evaluation of systems is carried out by the application of exergy and exergoeconomic analysis of the proposed alternatives in order to determine exergy efficiency and exergy based costs on production of system utilities. The Genetic Algorithms method has been chosen for optimization to show the applicability of evolutionary techniques in trigeneration plants. The optimization shows important profits in the exergy based costs of products, by means of the exergetic efficiency maximization of the different trigeneration systems.
Journal of Modern Green Energy
Background: Concentrated solar power (CSP) technology has been gaining more and more attention due to its inherent sustainable merit. Further promotion of sustainability requires the effective utilization of concentrated solar thermal radiations which can achieve through combined cooling, heat and power. In this context, the key objective of the research carried out in the present study was to propose and develop a novel solar thermal-driven combined cooling, heating, and power system for producing power of 7MW. Objective: The objective of the study is to reduce heat loss at various places and to increase the overall energy and exergy efficienices of the system. The effect of very influencing parameters like direct normal irradiance (DNI), extraction pressure, turbine back pressure, turbine inlet pressure, and pump inlet temperature were ascertained on energy and exergy efficiencies for the trigeneration system. In addition, the model was extended to incorporate the evaluation to id...
Energetic and Economic Analysis of a Solar-Assisted Trigeneration System
Proceedings of EuroSun 2018, 2018
The aim of this paper is to present the simulation activities carried out for the energy and economic assessment of a solar-assisted trigeneration system within the framework of EU FP7 BRICKER project. The system comprises a parabolic trough collectors field, an Organic Rankine Cycle unit and an adsorption chiller. It is installed in a hospital building in Aydin (Turkey). TRNSYS system simulations are used for the evaluation of the yearly performance. This work shows that the economic feasibility of the trigeneration layout concept is limited by low energy tariffs and by the low electricity generation efficiency of the small-scale ORC unit. For the system and application here presented, the operation of the trigeneration system should be driven by heating and cooling working modes, having the priority on a pure electricity generation.
Renewable energy, Exergoeconomic, Cogeneration system, Solar power Increasing environmental pollutions and the expense of fossil fuels necessitates employment of efficient instruments and easily producible clean sources as abasic solution to this problem. Cogeneration systems are used for their high performance with a performance of approximately eighty-five percent Cogeneration production system with renewable energy source is the best solution to fuel suitable and high cost Amon all renewable energy sources, use of solar power is of interest. Solar power is the best choice because it's free and clean. This project illustrates the analyzed exergy and eregyeconomic simulations of solar hybrid cycle. Thermo economic and exergoeconomic analysis where used in this research, with exergoeconomic we can analyze cycle cost, payback period and exergy performance. Case study for this project was a building with 480 m² or square meters area in Zahedan, Iran. In this study, a small scale hybrid solar heating, cooling and power generation set-up including solar collector, screw expender auxiliary heater, adsorption chiller, etc., was proposed and extensively investigated.