Energetic and exergetic performance analysis of a solar driven power, desalination and cooling poly-generation system
Esa Dube KermeJamel OrfiAlan S. FungElias M. SalilihSalah Ud‐Din KhanHassan AlshehriEmad AliMohammed Alrasheed
62
Citation
50
Reference
10
Related Paper
Citation Trend
Keywords:
Cogeneration
Organic Rankine Cycle
Parabolic trough
Multiple-effect distillation
Exergy efficiency
Low-temperature thermal desalination
The joint demand for power and freshwater is continuously increasing due to population growth, the rise of economic activity, and climate change. Integrated concentrating solar thermal power and desalination (CSP+D) plants may provide a key solution for the pressing freshwater deficit and energy problems in many regions of the world. Simulation tools with an accurate prediction of the yearly electric energy and freshwater production are needed. This paper analyzed the influence of the time step in the annual simulation of a CSP+D plant composed of a seawater multi-effect distillation unit and a parabolic trough concentrating solar thermal power plant, considering the location of Tabernas (Spain). A dynamic simulation tool of this system was developed, implementing the models in Engineering Equation Solver. The annual electricity and water productions obtained for the study case considered were 154 GWh and 3.45 hm3, respectively, using 5 min time steps, and 94 GWh and 2.1 hm3, respectively, with 1 h time steps. The results obtained show that a short time step interval (5 min) is recommended when using the detailed CSP model considered, which is prepared for simulation with short time steps. Step times of 1 h lead to excessive errors (about 30% in summer and 100% in winter), which underestimate the actual production.
Parabolic trough
Multiple-effect distillation
Low-temperature thermal desalination
Solver
Dynamic simulation
Cite
Citations (5)
Organic Rankine Cycle
Exergy efficiency
Thermal efficiency
Degree Rankine
Working fluid
Cite
Citations (18)
A Master of Science thesis in Mechanical Engineering by Mohammed Fouad Azfar Khan entitled, “Thermo-Economic Analysis of Organic Rankine Power Cycles Using Parabolic Trough Solar Technology”, submitted in December 2018. Thesis advisor is Dr. Mohamed Gadalla. Soft and hard copy available.
Parabolic trough
Organic Rankine Cycle
Degree Rankine
Trough (economics)
Economic Analysis
Solar Power
Cite
Citations (0)
In this paper, the performance of Parabolic Trough Solar Collector (PTSC)-based power generation plant is studied. The effect of adding an Organic Rankine Cycle (ORC), and a Thermal Energy Storage (TES) system on the performance and financial metrics of the PTSC-power plant is investigated. Moreover, multiple organic working fluids for the ORC are compared in terms of the thermal and exergetic efficiencies, as well as the pumping power, and the most efficient fluid is selected. Further, the TES system is characterized by two-tank storage system with a storage period of 7 hours/24 hours. A yearly, monthly, and daily performance analyses are presented based on the Typical Meteorological Year (TMY) values for the city of Abu Dhabi, to study the improvement caused by the ORC and TES system. The simulation results show that Benzene is the most efficient organic fluid, as it showed the highest thermal and exergetic efficiency, and the lowest pumping power when compared to other organic fluids. In addition, the presence of the ORC increased the annual energy output of the power plant by 4%, while the addition of the TES increased the annual energy output by 68% and decreased the LCE by 29%. In the case where both the ORC and TES are added, the annual energy output increased by 72%, while the LCE decreases by almost 31%.
Organic Rankine Cycle
Parabolic trough
Working fluid
Rankine cycle
Thermal efficiency
Degree Rankine
Solar Power
Thermal energy
Cite
Citations (2)
A combined Trilateral Cycle-Organic Rankine Cycle (TLC-ORC) system for waste heat recovery is proposed in this paper in order to obtain a better matching performance between the heat source and working fluid. Working fluid selection including Cyclohexane, Toluene, Benzene and water for the high temperature cycle is analyzed based on thermodynamic model under different evaporating temperature of high temperature cycle and low temperature cycle. Results show that Toluene has the best performance among the studied four high temperature working fluid. The net power output, thermal efficiency and exergy efficiency increases with Tevap,HT or Tevap,LT increasing at any a high temperature working fluid. The maximum net power output 11.3 kW, thermal efficiency 24.2% and exergy efficiency 63.2% are achieved by Toluene at Tevap,HT =530 K and Tevap,LT =373 K at the same time. It is also found that evaporator 1 has the largest exergy destruction while condenser 1 has the smallest one among all the components. Meanwhile, the condenser 2 has the lowest exergy efficiency while condenser 1 has the highest one. These results show us the direction to optimize the system parameters to improve the total efficiency of the whole system.
Organic Rankine Cycle
Working fluid
Condenser (optics)
Exergy efficiency
Thermal efficiency
Rankine cycle
Cite
Citations (14)
The exergy analysis of ORC unit driven by low-temperature waste heat was performed and an intuitive approach with simple impressions was developed to calculate the performances the ORC unit. Parameter optimization was conducted with turbine inlet temperature simplified as the variable and exergy efficiency or power output as the objective function by means of Penalty Function and Golden Section Searching algorithm based on the formulation of the optimization problem. The power generated by the optimized ORC unit can be nearly as twice as that generated by a conventional ORC unit. In addition, cycle parametric analysis was performed to examine the effects of thermodynamic parameters on the cycle performances such as thermal efficiency and exergy efficiency. It is proven that performance of ORC unit is mainly effected by the thermodynamic property of working fluid, the waste heat temperature, the pinch point temperature of the evaporator, the specific heat capacity of the heat carrier and the turbine inlet temperature under a given environment temperature.
Organic Rankine Cycle
Pinch point
Exergy efficiency
Degree Rankine
Thermal efficiency
Rankine cycle
Working fluid
Cite
Citations (3)
Organic Rankine Cycle (ORC) has been widely used for the recovery of low-grade heat into power such as solar energy and industrial waste heat. The overall thermal efficiency of ORC is affected by large exergy destruction in the evaporator due to the temperature mismatching between the heat source and working fluid. Trilateral Cycle (TLC) and Organic Flash Cycle (OFC) have been recognized as potential solutions because of their better performance on temperature matching between the heat source and working fluid at the evaporator. In this study, thermodynamic models of above three cycles are established in MATLAB/REFPROP. Results indicate that TLC obtains the largest net power output, thermal efficiency and exergy efficiency of 13.6 kW, 14.8% and 40.8% respectively at the evaporation temperature of 152℃, which is 37% higher than that of BORC (9.9 kW) and 58% higher than that of OFC (8.6 kW). BORC is more suitable under the conditions low evaporation temperature is relatively low due to the achieved maximum net power output, thermal efficiency and exergy efficiency. OFC has the minimum net power output, thermal efficiency and exergy efficiency under all the conditions of evaporation temperature compared to TLC and BORC. As for the UA value, TLC has the largest one ranging from 7.9 kW/℃ to 8.8 kW/℃ under all conditions while OFC gains the minimum UA value at low evaporation temperature and BORC gains the minimum UA value at high evaporation temperature.
Organic Rankine Cycle
Exergy efficiency
Thermal efficiency
Working fluid
Flash evaporation
Rankine cycle
Parabolic trough
Degree Rankine
Cite
Citations (41)
Organic Rankine cycle(ORC)has excellent low temperature performance,which is very suitable for combined heat and power(CHP)system.An experimental study is carried out to test the performance of an ORC-CHP system,with the temperature of heat source at 100℃ and that of turbine waste heat in the range of 21.6—48.7℃.The overall energy efficiency of ORC-CHP 96%—97%,power efficiency 4.4%—5.1%,and hot water heat gain efficiency 91%—92% are obtained.Overall exergy efficiency is 50.0%—75.3%,with power output exergy efficiency 5.1%—4.4% and hot water gain exergy efficiency 25.7%—56.2%.ORC-CHP system can utilize waste heat efficiently,so that both energy and exergy usage are greatly improved.
Organic Rankine Cycle
Exergy efficiency
Rankine cycle
Degree Rankine
Thermal efficiency
Cogeneration
Working fluid
Cite
Citations (3)
Organic Rankine Cycle
Working fluid
Exergy efficiency
Degree Rankine
Rankine cycle
Cite
Citations (136)
The use of solar thermal energy for electricity generation is a clean and sustainable way to cover the increasing energy needs of our society. The most mature technology for capturing solar energy in high temperature levels is the Parabolic Trough Collector. In this study, an Organic Rankine Cycle coupled with Parabolic Trough Collector is analysed for two approaches. First is to develop a hybrid cycle in which the Parabolic Trough Collector field is combined with Traditional Steam Rankine Cycle without storage tank having boiler as a heat exchanger for 25MW power generation at GNFC, Bharuch. And the second approach is to develop an Organic Rankine cycle coupled with Concentrated Solar collector field (Parabolic Trough Collector Field) without storage tank and water is used as a working fluid in both the systems. Economic analysis is also reported to assess the performance and commercial viability of the system.
Organic Rankine Cycle
Parabolic trough
Rankine cycle
Degree Rankine
Working fluid
Cite
Citations (0)