scholarly journals Effect of working fluids on the performance of phase change material storage based direct vapor generation solar organic Rankine cycle system

2021 ◽  
Vol 7 ◽  
pp. 348-361
Author(s):  
Jahan Zeb Alvi ◽  
Yongqiang Feng ◽  
Qian Wang ◽  
Muhammad Imran ◽  
Gang Pei
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Vapor Generation ◽  
Working Fluids ◽  
Cycle System ◽  
Change Material

scholarly journals Effect of Phase Change Material Storage on the Dynamic Performance of a Direct Vapor Generation Solar Organic Rankine Cycle System

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5904
Author(s):  
Jahan Zeb Alvi ◽  
Yongqiang Feng ◽  
Qian Wang ◽  
Muhammad Imran ◽  
Lehar Asip Khan ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Storage Tank ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Thermal Storage ◽  
Working Fluid ◽  
Vapor Generation ◽  
Cycle System ◽  
Change Material

Solar energy is a potential source for a thermal power generation system. A direct vapor generation solar organic Rankine cycle system using phase change material storage was analyzed in the present study. The overall system consisted of an arrangement of evacuated flat plate collectors, a phase-change-material-based thermal storage tank, a turbine, a water-cooled condenser, and an organic fluid pump. The MATLAB programming environment was used to develop the thermodynamic model of the whole system. The thermal storage tank was modeled using the finite difference method and the results were validated against experimental work carried out in the past. The hourly weather data of Karachi, Pakistan, was used to carry out the dynamic simulation of the system on a weekly, monthly, and annual basis. The impact of phase change material storage on the enhancement of the overall system performance during the charging and discharging modes was also evaluated. The annual organic Rankine cycle efficiency, system efficiency, and net power output were observed to be 12.16%, 9.38%, and 26.8 kW, respectively. The spring and autumn seasons showed better performance of the phase change material storage system compared to the summer and winter seasons. The rise in working fluid temperature, the fall in phase change material temperature, and the amount of heat stored by the thermal storage were found to be at a maximum in September, while their values became a minimum in February.

scholarly journals Effect of working fluids on the performance of a novel direct vapor generation solar organic Rankine cycle system

2016 ◽  
Vol 98 ◽  
pp. 786-797 ◽  
Author(s):  
Jing Li ◽  
Jahan Zeb Alvi ◽  
Gang Pei ◽  
Jie Ji ◽  
Pengcheng Li ◽  
...  
Keyword(s):  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Vapor Generation ◽  
Working Fluids ◽  
Cycle System

Phase Change Material as Pump in an Organic Rankine Cycle

2014 ◽  
Vol 575 ◽  
pp. 662-667
Author(s):  
Barghav Subramony Hariharan ◽  
Kaushik Suresh
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Electrical Energy ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Change Material

Organic Rankine Cycles (ORC) is predominantly used in waste heat recovery applications because of their low temperature working range. The main efficiency enhancement operation in an Organic Rankine Cycle is reducing the pump work .The pump converts electrical energy to flow energy. This input reduced and output maintained at the same level gives us a more efficient waste heat recovery system. The pump work can also be achieved by using a material that has the ability to expand on heating and revert back to its original state on cooling. The expansion property of the material is used to compress and drive the operating fluid through the cycle. Material that was observed to possess such properties was Phase Change Material. Conventionally PCM were used as thermal storage to preheat the working fluid in an ORC but a novel idea is to make the PCM utilize the heat rejected from the condenser and do the pump work. This paper discusses the various desirable properties of PCM to perform pump work efficiently and also the general layout and working of ORC system using PCM. The working fluid selected is toluene

scholarly journals Effect of phase change materials on the performance of direct vapor generation solar organic Rankine cycle system

Energy ◽  
2021 ◽  
Vol 223 ◽  
pp. 120006
Author(s):  
Jahan Zeb Alvi ◽  
Yongqiang Feng ◽  
Qian Wang ◽  
Muhammad Imran ◽  
Gang Pei
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Vapor Generation ◽  
Cycle System

Performance Analysis of Near-Critical and Subcritical Organic Rankine Cycle

2013 ◽  
Vol 448-453 ◽  
pp. 3270-3276
Author(s):  
Yu Ping Wang ◽  
Yi Wu Weng ◽  
Ping Yang ◽  
Lei Tang
Keyword(s):  
Performance Analysis ◽  
Thermophysical Properties ◽  
Thermodynamic Model ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Vapor Generation ◽  
Working Fluids ◽  
The Difference ◽  
Better Than

In this paper, three typical working fluids were selected for the near-critical ORC and subcritical ORC. The difference of performance between the near-critical ORC and subcritical ORC was analyzed by establishing the thermodynamic model. The reason for difference was analyzed in terms of the thermophysical properties. The results indicate that the performance of the near-critical ORC is better than the subcritical ORC. The net absorbed heat, net power and efficiency of the near-critical ORC vary slowly with the vapor generation temperature, which means that the near-critical ORC has good off-design performance. The dry working fluid R236fa is best adapted for the near-critical ORC among the three working fluids. The singular performance of the near-critical ORC depends on the properties of latent heat and type of working fluid in near-critical region.

Selection of Working Fluids for Different Temperature Heat Source Organic Rankine Cycle

2012 ◽  
Vol 614-615 ◽  
pp. 195-199
Author(s):  
Guang Lin Liu ◽  
Jin Liang Xu ◽  
Bing Zhang
Keyword(s):  
Power Generation ◽  
Heat Source ◽  
Flue Gas ◽  
Thermal Power ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Source Power ◽  
Working Fluids ◽  
Cycle System ◽  
Temperature Heat

In the current paper, under the condition of different flue gas temperatures and constant flue gas thermal power, the influence of different organic working fluids on the efficiency of sub-critical organic Rankine cycle system were studied. The efficiency and other parameters of the simple system were calculated. The results show that the efficiency of sub-critical organic Rankine cycle system could reach maximum when the parameters of the working fluids in the expander inlet are dry-saturation. Flammability, toxicity, ozone depletion and other factors of the working fluids should be considered in the organic Rankine cycles. R245fa is considered a better choice for low-temperature heat source power generation, and the efficiency of the system is about 10.2%; for the high-temperature heat source, R601a can be considered; however, due to its high flammability, novel working fluids should be further discovered for power generation.

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