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(ENRIC2014) The 1st Environment and Natural Resources International Conference 6 – 7 November, 2014, The Sukosol hotel, Bangkok, Thailand pressure are assumed to be the inlet temperature and pressure from the evaporator respectively. The pump is designed to a flow rate of 10kg/s. The condenser cooling temperature in Abuja is set to a temperature of 30 and that in Bangkok to a temperature of 34 . This is because of the difference in available cooling temperature. Using a generator efficiency of 96%, the hourly electricity generated by the solar LFR system is shown in figs. 6a and 6b. Higher amount of electricity is generated in Abuja than in Bangkok as seen in figs. 6a and 6b. This is attributed to the slight difference in ambient temperature experience in both regions. The ambient temperature influences the cycle performance in two different ways: the ambient heat losses of the collector are increased with a lower ambient temperature, and the cycle efficiency is increased because of a lower condensing temperature. Increased input temperature from the LFR and a slightly lower condensing temperature in the ORC condenser create a slightly higher temperature difference in the power block there-by increasing the amount of electricity generated. During the wet season, the storage temperature in Bangkok is similar to that of Abuja and so the generated amount of electricity is similar. The generated electricity shown in figs. 6a and 6b suggests that the higher the source temperature the better. This is true from the viewpoint of ORC efficiency, but the LFR collector efficiency states otherwise, the lower the collector temperature, the higher the collector efficiency. The product of the two efficiencies represents the overall system efficiency as a function of temperature and thus should be maximized. The monthly average product efficiency of the LFR solar electricity system is shown in fig. 7. 800 700 600 500 400 300 200 100 0 700 600 500 400 300 200 100 0 Month Figure 6a: Hourly electricity generated by the ORC unit Abuja. 10 0 Abuja Month Figure 7: Monthly average system efficiency. 41 Month Figure 6b: Hourly electricity generated by the ORC unit Bangkok. System efficiency (%) kWh (el) kWh (e)PDF Image | Comparative Performance of a Solar Concentrating Linear Fresnel Reflector for Electricity Generation in Nigeria and in Thailand
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