y integration variable Greek 8 parameter (ee7) £e effective multilayer insulation emissivity (0.02) <p phase angle (Appendix A), degrees y flux ratio (oTfi4/qs c) r| receiver steady-state thermal efficiency 9a average nondimensional temperature ((Ta-Tfl)/Ts) 9V variable nondimensional temperature (T^/T/ 0 transform of 9V k conductance and resistance ratio (Appendix A) p density, kg/m3 o Stefan-Boltzmann constant (5.67 x 10'8 W/m2K4) o ransform parameter (^Tcs) t nondimensional time (t/P) % nondimensional time constant (t/P) c, frequency ratio (cotc) to frequency of source flux, s'1 Subscripts a time average c constant, time- and space-average e effective f fluid i fluid inlet L loss (Appendix A) o fluid outlet s solar source, surface v time variable (oscillation) 0 single mass (Appendix A) 1,2 blocks 1,2 (Appendix A)
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