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NGUYEN VAN HAP, GEUN SIK LEE, NGUYEN MINH PHU case but it is not selected because of its high evaporating pressure and also odorous and toxic properties. Thus, from all the analyses performed above, none of working fluids satisfies all the design criteria of SH- ORC. It is not easy to find an ideal working fluid. Finally, the most suitable group of working fluid chosen for the SH-ORC is R152A, R600, and R600A, in that order. 3.2 Performance analysis The effective area of solar collector is calculated for 20oC increase of warm seawater temperature after the solar collector array. Besides, the weather data in the Nha Trang region, Vietnam is used for this simulation process. Fig. 4 shows the monthly ambient temperature, solar radiation, and wind speed in Nha Trang [7]. The results reveal that the required Figure 5: Hourly variations of SH-OTEC efficiency area of the collector varies from 42.3 m2 in March to 82.2 m2 in November and the annual average value of the required collector area is approximately 53 m2. The effect of thermal efficiency of SH-OTEC on solar radiation is determined by using a Transient system simulation program, TRNSYS ver.16 [7]. A flat-plate single-glazed solar collector is chosen as an effective area of 90 m2. Besides, R152A is selected as working fluid because of its good thermodynamic properties according to above mentioned analysis. As can be seen in Fig. 5, the simulation results for the annual hourly variation of I are presented. The SH- OTEC efficiency, I fluctuates up to nearly 14% due to change in daily solar gain. Contrary to the high efficiency of 14%, the low efficiency is smaller than 2.7% corresponding to that of ordinary OTEC. Figure 4: Weather parameters in Nha Trang clean and free energy resources. International Journal of Renewable Energy and Environmental Engineering ISSN 2348-0157, Vol. 02, No. 02, April 2014, pp 100-104 Figure 6: Monthly average variations of SH-OTEC efficiency It can be seen from Fig. 6 that the monthly average value of the efficiency of the SH-OTEC changes annually up to about 40%, based on the efficiency of about 6.5%. In January and November, the system has the lowest efficiency of approximately 6.5% while the system efficiency goes up to the maximum of 9% in March. From Fig. 6, the monthly average of annual gain achieves 8.2%. The efficiency of 8.2% is not so high for widespread application in industry. But, compared with the traditional power plants, SH- OTEC does not consume any traditional fossil resources. Energy resources supplied for operation of SH-OTEC are only solar energy and the ocean thermal energy which are considered as infinite,PDF Image | Analysis of the Effect of Solar Radiation on OTEC
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