Organic Rankine Cycle
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Text | Assessment Alternative Energy for Organic Rankine Cycle Power Plant in Thailand | 001
Nattaporn Chaiyat / International Journal of Engineering and Technology (IJET)
Assessment Alternative Energy for Organic Rankine Cycle Power Plant in Thailand
School of Renewable Energy, Maejo University, Chiang Mai, Thailand firstname.lastname@example.org
Abstract—This paper studies the possibility of power generation by using alternative energy in Thailand which are geothermal energy, solar energy and waste energy based on the energy and economy indicators. An Organic Rankine Cycle (ORC) is used to generate electricity from heat sources of hot springs, solar water heating system and RDF-5, respectively. In this study, a 20 kW ORC system with using R-245fa as working fluid was tested and evaluated the system efficiency. It could be found that the efficiency of ORC system was around 8%, when hot water temperature was higher than 100 oC. The values of levelized electricity costs (LEC) of geothermal energy, solar energy and waste energy were 0.148, 0.547 and 0.442 USD/kWh, respectively. The suitable alternative energy for generating electricity was the geothermal energy which was beneficial than the solar and waste energy power plants in terms of energy and economy results.
Keyword-Organic Rankine Cycle, Geothermal Energy, Solar Energy, Waste Energy, Levelized Electricity Cost
Thailand relies on imported energy, of which the volume has grown continuously. In 2011, the energy imports increased 30.2% compared in 2010 . The government has set a framework and direction of the country’s energy policy which focuses on energy security to ensure national energy independence and stability by encouraging energy development, and development of renewable and alternative energy to be 25% of the total power of the country in 2021. Therefore, for supporting the strategic of Ministry of Energy to produce electricity from alternative energy, and then 3 types of alternative energy of geothermal, solar and waste have been considered for generating electricity in this study.
The technique to generate electricity from hot spring, the several method are presented such as Chaiyat and Chaichana  reported the technology to generate electricity of binary system and thermoelectric module. Combs et al.  studied the small geothermal power plant in America and Japan at capacity around 100-1,000 kW. The technologies of the slim hole and binary-cycle technology were selected to use for the off-grid area. It could be found that the environmental impact from the geothermal power plant was lower than the fossil power plant which was similarly Brophy  Kose  and Dagdas . For the simulation studies, the selection of suitable working fluids for the ORC system was the hot issue which had many reports to study this topic such as Hettiarachchi et al.  Schuster et al.  Guo  Sauret et al.  Liu et al.  Edrisi et al.  Li et al.  and Rodriguez et al. . It was found that the suitable working fluid of those results were different because the system conditions of each study were different. But the most suitable working fluid of those studies introduced R-134a and R-245fa.
In addition, the ORC system was integrated with a solar water heating system. Thawonngamyingsakul and Kiatsiriroat  studied the performance and analyzed a solar water heating system of flat-plate and evacuated- tube solar collector types to generate and supply heat to ORC in the northern part of Thailand. It was found that the values of levelized electricity costs (LEC) from flat-plate and evacuated-tube solar collectors were 0.939 and 0.747 USD/kWh, respectively. Ketjoy and Rakwichian  reported the cost of energy at 0.781 USD/kWh of solar parabolic technology and biomass hybrid for power generation by using the ORC technique in Thailand. There were some reports on the ORC with different heat source such as waste heat , solar thermal [18,19], biomass  and etc.
The main objective of this research is to study the possibility of power generation by using alternative energy in Thailand which are geothermal energy, solar energy and waste energy based on the energy and economy indicators.
ISSN : 0975-4024 Vol 7 No 1 Feb-Mar 2015 317
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