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436 Solar Collectors and Panels, Theory and Applications Parameters Outer diameter D mm Value Parameters 45 Generator efficiency ε Value 0.95 0.85 0.75 0.857 3.157 0.014 Inner diameter D mm 25 Regenerator efficiency ε ir og Turbine efficiency ε 0.80 Pump efficiency ε tp Optical conversion of CPC η 0.644 Optical conversion of FPC η 00 First heat loss coefficient of collectors of CPC A W m2 oC Second heat loss coefficient of collectors of CPC B W m2 oC2 0.749 0.005 First heat loss coefficient of collectors of FPC A W m2 oC Second heat loss coefficient of collectors of FPC B W m2 oC2 Table 2. Specifications of the proposed low-temperature solar thermal electricity system The following preconditions are assumed: 1) the influence of pressure drop on the saturated temperature arising from flow resistance in the evaporator is negligible; and 2) the two- phase flow is one-dimensional, that is, all parameters change only in the flow direction (Y). 4.3.1 Liquid-phase region of working fluid The controlling equations for the energy balance of working fluid and conduction oil are as follows: dTf =UπDi(Th−Tf) (16) dY mfCp,f dTh =UπDi(Th−Tf) (17) dY mhCp,h Total heat transfer coefficient is calculated by the following: U=1(1+1) (18) where h =Nu kf i fDi h =Nu oh k (D −D) oi h hi ho The convectional heat transfer coefficient can be calculated using the Dittus-Boelter equation [17]. When flow of the outer fluid is laminar, the concentric tube is considered isothermal at the inner annulus of the cross-section; it is insulated at the outer annulus, thus obtaining the heat transfer coefficient, according to the Handbook of Heat Transfer [18]. 4.3.2 Binary-phase region of working fluid Energy balance of the conduction oil remains to be controlled by Eq.17. However, energy balance (dryness) of organic fluid is controlled by the following: www.intechopen.comPDF Image | Working Fluid Selection for Low Temperature Solar Thermal Power Generation with Two-stage Collectors and Heat Storage Units
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