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Analysis of the Effect of Solar Radiation on Ocean Thermal Energy Conversion (OTEC) in Vietnam The first law efficiency: Wt Wfp I Q E (8) As can be seen in Table 2, the saturated pressure in the evaporator and the condenser are observed as the important operating criteria. The working fluids of R718 and R141b have the low pressure. The condensing pressure is only 1.23kPa for water and 43.44kPa for R141b. In contrast to water and R141b, R32 has the highest evaporating pressure followed by R410A, R125 and R507A, respectively. The working fluids with good evaporating and condensing pressure are R600, R600A, R152A, R134A, and isobutane. On the other hand, the turbine inlet volume flow rate (V3) relates with size and cost of SH-OTEC. From Table 2, among 19 working fluids, the group of high volume flow rate such as water, R141b, and isobutane is the worst choice for SH- OTEC. Working fluids as R152A, NH3, R22, R134A, R407C, Propane, R404A, and R143A have small volume flow rate which are suitable for economic criterion. Figure 3 illustrates the first and second law efficiency of thermodynamics of SH-ORC with different working fluids. As shown in this figure, the fluids with high first law efficiency are water, ammonia, The second law efficiency with considering turbine power only owing to negligible small pumping power can be written by (9) 3. Results and discussions 3.1 Working fluid selection The characteristics of 19 working fluids are investigated for a 1 kW power system. The operating conditions of OTEC are shown in Table 1. The OTEC system is operated under the assumption that the evaporating temperature is heated by the warm seawater from the collector array and increases from 250C to 350C. The thermodynamic properties of working fluids and the performance of the ORC are simulated by using the simulation tool EES (Engineering Equation Solver)[8]. The results are W II t Wt Itot Table 2 The parameters of ORC with different working fluids S. No Substance PE[kPa] Pc[kPa] m[kg/s] V3[l/s] 1 R718 5.63 1.23 0.008 193.4 2 R717 1351 615.3 0.016 1.51 3 R141b 112.2 43.44 0.080 14.95 4 R600 329 148.7 0.049 5.97 5 R152A 794.8 373.3 0.064 2.60 6 Isobutane 464.5 220.3 0.054 4.47 7 R22 1355 681.2 0.097 1.67 8 R407C 1327 634.9 0.088 1.58 9 R600a 463.3 221.4 0.055 4.5 10 R134a 887.5 414.9 0.099 2.28 11 R32 2190 1107 0.066 3.4 12 R22_mh 1354 680.3 0.097 1.68 13 R134a_mh 887.4 414.8 0.099 2.28 14 Propane 1218 636.7 0.052 1.94 15 R143a 1625 836.7 0.107 1.39 16 R404A 1608 819.6 0.120 1.38 17 R410A 2130 1081 0.094 1.06 18 R125 1778 909 0.150 1.24 19 R507A 1659 850.5 0.122 1.53 revealed in Table 2. R141b, R600, R152A, R22, R407C, R600A, and R134A. Ammonia is a good working fluid in this International Journal of Renewable ISSN 2348-0157, Vol. 02, No. 02, April 2014, pp 100-104 Energy and Environmental EngineeringPDF Image | Analysis of the Effect of Solar Radiation on OTEC
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