The graph in Figure 7.18 gives the results of an ASHRAE standard performance test for a single-glazed
Question:
The graph in Figure 7.18 gives the results of an ASHRAE standard performance test for a single-glazed flat-plate collector. If the transmittance for the glass is 0.90 and the absorptance of the surface of the collector plate is 0.92, determine The collector heat-removal factor \(F_{R}\)
The overall heat loss conductance of the collector \(U_{c}\) in \(\mathrm{W} / \mathrm{m}^{2} \mathrm{~K}\)
The rate at which the collector can deliver useful energy in \(\mathrm{W} / \mathrm{m}^{2} \mathrm{~K}\)
When the insolation incident on the collector per unit area is \(600 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}\), the ambient temperature is \(5^{\circ} \mathrm{C}\), and inlet water is at \(15^{\circ} \mathrm{C}\).
The maximum flow rate through the collector, with cold water entering at a temperature of \(15^{\circ} \mathrm{C}\), which will give an outlet temperature of at least \(60^{\circ} \mathrm{C}\) if this collector is to be used to supply heat to a hot water tank.
Figure 7.18
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