Analysis of low temperature solar thermal electric generation using regenerative Organic Rankine Cycle

Pei, Gang; Li, Jing; Ji, Jie

doi:10.1016/j.applthermaleng.2010.01.011

Cited by 179 publications

(43 citation statements)

References 22 publications

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“…The result showed that compound parabolic collector (CPC) and flat plate collector (FPC) require 25-26 m , respectively, to produce 1 kW power. In a different study, Gang et al [15] reported an overall electrical efficiency of 8.6% using a compound parabolic trough with a solar irradiation of 750 W/m 2 . Delgado [16] studied the small-scale solar ORC system that can be used to pump water and found that they were installed mostly in Asian countries.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Thermoeconomic Analysis of Small-Scale Solar Organic Rankine Cycle (SORC) System

Baral

Kim

Yun

et al. 2015

Entropy

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A small-scale solar organic Rankine cycle (ORC) is a promising renewable energy-driven power generation technology that can be used in the rural areas of developing countries. A prototype was developed and tested for its performance characteristics under a range of solar source temperatures. The solar ORC system power output was calculated based on the thermal and solar collector efficiency. The maximum solar power output was observed in April. The solar ORC unit power output ranged from 0.4 kW to 1.38 kW during the year. The highest power output was obtained when the expander inlet pressure was 13 bar and the solar source temperature was 120 °C. The area of the collector for the investigation was calculated based on the meteorological conditions of Busan City (South Korea). In the second part, economic and thermoeconomic analyses were carried out to determine the cost of energy per kWh from the solar ORC. The selling price of electricity generation was found to be $0.68/kWh and $0.39/kWh for the prototype and low cost solar ORC, respectively. The sensitivity analysis was carried out in order to find the influencing economic parameters for the change in NPV. Finally, the sustainability index was calculated to assess the sustainable development of the solar ORC system.

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Section: Introductionmentioning

confidence: 99%

Experimental and Thermoeconomic Analysis of Small-Scale Solar Organic Rankine Cycle (SORC) System

Baral

Kim

Yun

et al. 2015

Entropy

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“…The amount of electricity that can be produced by solar energy is 4 × 10 15 megawatt which is 200 times more then the global consumption of the electricity [1]. The main use of solar energy is to heat and cool buildings, heat water and to generate electricity [2][3][4][5]. There are two types of solar energy collection systems, the photovoltaic systems and the solar thermal collectors.…”

Section: Introductionmentioning

confidence: 99%

Mathematical model for thermal and entropy analysis of thermal solar collectors by using Maxwell nanofluids with slip conditions, thermal radiation and variable thermal conductivity

2018

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Abstract:In the present research a simplified mathematical model for the solar thermal collectors is considered in the form of non-uniform unsteady stretching surface. The non-Newtonian Maxwell nanofluid model is utilized for the working fluid along with slip and convective boundary conditions and comprehensive analysis of entropy generation in the system is also observed. The effect of thermal radiation and variable thermal conductivity are also included in the present model. The mathematical formulation is carried out through a boundary layer approach and the numerical computations are carried out for Cuwater and TiO 2 -water nanofluids. Results are presented for the velocity, temperature and entropy generation profiles, skin friction coefficient and Nusselt number. The discussion is concluded on the effect of various governing parameters on the motion, temperature variation, entropy generation, velocity gradient and the rate of heat transfer at the boundary.

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“…They concluded that the efficiency of system was higher than a single-stage system using pure isopentane or R245fa. Gang et al [16] analyzed two innovated solar ORC systems with two-stage collectors and pointed out that the ORC efficiency could be increased by improving the heat collection efficiency provided by the two-stage solar collectors. On the other hand, there is one solar ORC plant currently in use, which is a commercial plant of a 1 MW sized in the USA that was supplied by the ORMAT Company, which uses n-pentane as the working fluid with a solar to electric efficiency of 8.4% [17].…”

Section: Introductionmentioning

confidence: 99%

Energy, Exergy and Performance Analysis of Small-Scale Organic Rankine Cycle Systems for Electrical Power Generation Applicable in Rural Areas of Developing Countries

et al. 2015

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This paper introduces the concept of installing a small-scale organic Rankine cycle system for the generation of electricity in remote areas of developing countries. The Organic Rankine Cycle Systems (ORC) system uses a commercial magnetically-coupled scroll expander, plate type heat exchangers and plunger type working fluid feed pump. The heat source for the ORC system can be solar energy. A series of laboratory tests were conducted to confirm the cycle efficiency and expander power output of the system. Using the actual system data, the exergy destruction on the system components and exergy efficiency were assessed. Furthermore, the results of the variations of system energy and exergy efficiencies with different operating parameters, such as the evaporating and condensing pressures, degree of superheating, dead state temperature, expander inlet temperature and pressure ratio were illustrated. The system exhibited acceptable operational characteristics with good performance under a wide range of conditions. A heat source temperature of 121 °C is expected to deliver a power output of approximately 1.4 kW. In addition, the system cost analysis and financing mechanisms for the installation of the ORC system were discussed.

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Analysis of low temperature solar thermal electric generation using regenerative Organic Rankine Cycle

Cited by 179 publications

References 22 publications

Experimental and Thermoeconomic Analysis of Small-Scale Solar Organic Rankine Cycle (SORC) System

Experimental and Thermoeconomic Analysis of Small-Scale Solar Organic Rankine Cycle (SORC) System

Mathematical model for thermal and entropy analysis of thermal solar collectors by using Maxwell nanofluids with slip conditions, thermal radiation and variable thermal conductivity

Energy, Exergy and Performance Analysis of Small-Scale Organic Rankine Cycle Systems for Electrical Power Generation Applicable in Rural Areas of Developing Countries

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