Page 353 - Handbook of Energy Engineering Calculations

FIGURE 15 Ratio of mass surface area to collector area. (Based on
data in DOE/CS-0127-2 Passive Solar Design Handbook, vol. 2.)

7. Determine the average daily inside temperatures

To verify that the collector and thermal storage material are correctly sized,
the average inside temperature must be determined. Use t = t + 5 + (i )(65 –
a
l
D
t )/H , where t = average daily inside temperature, °F (°C), and 5°F (2.8°C)
a
D
l
is an assumed inside temperature increase owing to internal heat generation
such as lights, equipment, and people. Thus, t = 32 + 5 + (54,387)(65 –
l
32)/53,904 = 70.3°F (21.27°C).
To determine the average daily low and high temperatures, use t = t –
L
l
Δt/2.5, and t = t , + Δt/1.67, where t = minimum average space
L
l
H
temperature, °F (°C); t = maximum average space temperature, °F (°C); and
H
Δt = inside space temperature fluctuation used in step 6. Thus, t = 70.3 –
L
15/2.5 = 64.3 °F (17.9 °C), and t = 70.3 + 15/1.67 = 79.3 °F (26.27°C).
H

8. Estimate the passive solar-heating contribution

To estimate the passive solar-heating contribution (SHC) for an average