Use the \(f\)-chart to determine the amount of solar energy that can be delivered in Little Rock, AR, in January for the following solar and building conditions:

Building

Load: 40 million Btu/month 

Latitude: \(35^{\circ} \mathrm{N}\)

Solar system 

Collector tilt: \(55^{\circ}\), facing south 

Area: \(1000 \mathrm{ft}^{2}\)

Ambient temperature: \(40.6^{\circ} \mathrm{F}\)

Collector efficiency curve: see Figure 7.19 

No heat exchanger used 

Nominal storage, flow rate, and load heat-exchanger values used

Figure 7.19 

Transcribed Image Text:

80 60 60 40 40 ne collector efficiency 20 20 Symbol Fluid Covers 1 Surface FRnopt FRU (W/mC) 123456| Water 0 Black paint 0.68 34.0 Water 1 Black paint 0.74 8.2 Air 1 Black chrome 0.52 4.8 Water 1 Black chrome 0.70 4.7 Water 2 Black chrome 0.61 3.2 Water Evacuated tube 0.54 1.4 10 5 Flow rates Water: 0.02 kg/s m(14.7 lb/h ft) Air: 0.01 m/s m(1.97 cfm/ft) 2 0.1 0.2 Tin-Ta (km2 I W 0.3 0.4