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135 of packed-bed temperature data taken from within the tank rather than the surface. Examination of Figure 6.32 indicates that losses from the bottom of the tank are much more significant than from the top, as evident by the increase in temperature change from the top of the tank to the bottom. Considering the significant airspace at the top of tank, acting as insulation shown in Figure 6.26, this observation is not unreasonable. The constraint of equation [6.3.54] in combination with the fact that hloss,top << hloss,bot was used to select approximate loss coefficients for the numerical model. Fluid property data for CaloriaTM HT-43 are available and were used in this simulation. Properties of the rock-sand mixture at Solar One, particularly thermal conductivity, are more difficult to determine. Typical solid rock thermal conductivities are in the range of 2-5 W/m-K, with the majority of species favoring the lower bound [Incropera, 2005]. There was no specific information on the type of rock used in the Solar One system. As an approximation an “average” rock-sand thermal conductivity of 2.5 W/m-K was used for simulation of the Solar One cool-down test. Using the numerical model described in the previous section, Figure 6.34 was generated using the parameters appearing in Table 6.4. Table 6.4 Long-term storage model inputs Variable Value ρf 700* ρs kf ks Cf Cs hloss , w hloss ,top hloss ,bot *Faas, 1986 2643* f(T) 2.5 f(T) 1000* 0.350 0.005 0.595PDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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