A desert receiver operates with its surroundings at at midday

PHYSICS · Subjective · Fermi University Physics · Thermal, Statistical & Complex Systems · Earth, Climate & Energy Physics · The laws of thermodynamics

Energy from Physics, Ch The solar resource resolved: geometry, spectrum and the limits of concentration

Problem

A desert receiver operates with its surroundings at T0=320 KT_0 = 320\,\mathrm{K} at midday, warmer than the usual 300 K300\,\mathrm{K} dead state. Taking the Sun's effective temperature as T⊙=5772 KT_\odot = 5772\,\mathrm{K}, calculate Petela's exergy factor ψ=1−43(T0/T⊙)+13(T0/T⊙)4\psi = 1 - \tfrac43(T_0/T_\odot) + \tfrac13(T_0/T_\odot)^4 for this dead state, and compare it with the Carnot factor 1−T0/T⊙1 - T_0/T_\odot.

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