How large (MJ/h) should a heat-rejection system be if it must dump the entire heat production of a \(1000 \mathrm{~m}^{2}\) solar collector array in Denver, CO, on August 21 if the collector is at \(100^{\circ} \mathrm{C}\) and the ambient temperature is \(35^{\circ} \mathrm{C}\) ? Use solar collector data in Figure 7.19 and NREL hourly solar radiation data that can be found on the Internet.

Figure 7.19

Transcribed Image Text:

Symbol Fluid Covers Surface FRopt FRU (W/mC) 60 80 1 Water 0 Black paint 0.68 34.0 2 Water 1 Black paint 0.74 8.2 3 Air 1 Black chrome 0.52 4.8 4 Water 1 Black chrome 0.70 4.7 60 60 5 Water 2 Black chrome 0.61 3.2 6 Water Evacuated tube 0.54 1.4 ne collector efficiency 40 20 20 1 2 0.1 5 Flow rates Water: 0.02 kg/s m(14.7 lb/h ft) Air: 0.01 m/s m(1.97 cfm/ft) 6 0.2 Tin-Ta (km Ic W 0.3 0.4