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NGUYEN VAN HAP, GEUN SIK LEE, NGUYEN MINH PHU where, t ,G and m f are the turbine, the generator efficiency, and the mass flow rate of working fluid, respectively. The discharged heat in the condenser QC is expressed by Q m h h (2) Cf41 The absorbed heat in the evaporator QE is given by QE mf h3 h2 (3) The work required by the pump is given by (4) (5) where, T0,TH and TL are the ambient, heat source and cold source temperature, respectively. On the other hand, the general equation of solar thermal efficiency is defined as (6) Twcolo Two TE 8 2 2S 7 3 m h h Wfpf2 1 2-3: Preheating and Vaporization 5-6: Cold seawater heating 7-8: Warm seawater cooling TC 1 4S4 Tco Tci 5 3-4: Expansion 4-1: Condensation 1-2: Pumping 6 Entropy s fp System total irreversibility: Figure 2: T-s diagram of SH-OTEC Table 1 The operating conditions of the OTEC Turbinegeneratorpower(Wt) kW 1 35 hh hh Itot mfT0 2 3 4 1 THTL A I CT Q Generator efficiency (G) - Efficiency of working fluid pump (fp) Further, the solar thermal collector efficiency can be expressed as [6, 7] Twcolo Solar collector 7 Evaporator Warm-sea- 8 water pump Twi Two Warm sea water 3 Turbine Condenser Working fluid pump 1 Cold-sea- water pump Tci Cold sea water T T T T FFU i 0FU i R RLIRL/TI 2 2 TT (7) FR : Overall collector heat removal efficiency factor where, UL : Overall heat loss coefficient of the collector Figure 1: Schematic of SH-OTEC 5 Figure 3: The first and second law efficiency of SH-OTEC U L / T : Thermal loss coefficient dependency on T I AC : Aperture area of the collector Tco 0 oC 10 4 25 Turbine efficiency (t) - 0.85 0.9 0.8 Generator ~ 6 4 International Journal of Renewable Energy and Environmental Engineering ISSN 2348-0157, Vol. 02, No. 02, April 2014, pp 100-104 Evaporating temperature (TE) Condensing temperature (TC) Cold seawater temperature (Twi) Warm seawater temperature (Tci) : Solar radiation : Transmittance-absorptance product Ti : Fluid inlet temperature Q : Useful heat transfer rate of the collector T Temperature TPDF Image | Analysis of the Effect of Solar Radiation on OTEC
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