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(ENRIC2014) The region has an average minimum and maximum monthly ambient temperature of and [19]. The northern part of Nigeria experiences a less humid weather with prolonged dry season and a mean monthly ambient temperature above as they are closer to the Sahara region. Thailand on the other hand, is also a tropical region located in the south eastern part of Asia. There are three seasons: hot, rainy and cool. On the average, temperatures are high with an average minimum and maximum monthly ambient temperature of and [19]. The rainy season falls in the months of May, June, July, August, September and October with an average yearly rainfall of about 150 mm. Both regions have considerably similar climatic conditions with Abuja receiving more rainfall during the wet or rainy season than Bangkok. The cloudiness in Bangkok is more dense than that experienced in Abuja and so slightly more humid than Abuja. 2. Methodology In this comparative study of the performance of the solar concentrating LFR in both regions, firstly a mathematical model is formed to estimate hourly solar irradiance from the obtained daily average clear sky direct normal radiation from NASA surface meteorological energy website. Mathematical models are then formulated for both the LFR system and the organic Rankine cycle (ORC) power block. Assuming that the working fluid for the ORC is selected based on reviews and the optical performance of the LFR is fixed, simulations of the solar thermal electricity generation in both regions based on the developed models are carried out. The results from the simulations are presented and then conclusions are made. System description The linear Fresnel reflector is made of flat mirror strips assembled on horizontal a frame and the receiver is mounted on a tower (usually 10–15 m tall), suspended above and along reflector arrays as seen in fig. 1. The slightly curved elastic reflecting mirrors comprising of 417 linear Fresnel reflectors dimensioned 12m x 2m on an area of 12,000 m2 are mounted on a one axis tracking devices tracking the sun on an east-west movement and concentrating sunlight incident on the linear reflectors to the receiver. Solar radiation concentrated into the receiver is absorbed by a heat transfer fluid (HTF) circulating through the system. The HTF (water) carries the absorbed heat from the receiver to the storage tank. Heat is stored in the storage unit which is a fully insulated hot water storage system designed to store hot water for 6-8 hours. The circulation of the HTF through the solar system continues for as long as there is sunshine. Thermal energy stored in the storage unit as hot water is transferred to the demand load via heat exchangers. Among many well proven technologies the ORC is one of the most suitable and promising methods for the conversion of low grade heat into power. The ORC is a thermally operated electricity generator which has the advantage to generate power with low-medium grade heat unlike the steam Rankine cycle that requires high grade heat to generate electricity. The ORC achieves this by using a low vapor-point refrigerant as the working fluid instead of water. The 1st Environment and Natural Resources International Conference 6 – 7 November, 2014 , The Sukosol hotel, Bangkok, Thailand Figure 1: schematic design of the linear Fresnel reflector [13]. Figure 2: T-s diagram for the ORC [16]. 37PDF Image | Comparative Performance of a Solar Concentrating Linear Fresnel Reflector for Electricity Generation in Nigeria and in Thailand
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