Page 339 - Handbook of Energy Engineering Calculations
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Solar Energy Design Corporation. Developed by Arney, Seward, and Kreider
for passive predictions of solar performance, the P chart uses only the
building heat load in Btu/(°F · day). The P chart will specify the solar
fraction and optimum size of three passive systems.
The monthly solar load ratio is an empirical method of estimating monthly
solar and auxiliary energy requirements for passive solar systems. For more
data on both the P chart and SLR methods, see the Kreider work mentioned
above.
SOLAR-COLLECTOR SELECTION FOR DOMESTIC HOT-
WATER HEATING SYSTEMS
Select the area for a solar collector to provide hot water for a family of six
people in a residential building in Northport, NY, when the desired water
outlet temperature is 140°F (60°C) and the water inlet temperature is 50°F
(10°C). A pumped-liquid type of domestic hot-water (DHW) system (Fig. 12)
is used. Compare the collector area required for 60, 80, and 90 percent of the
DHW heading load.
FIGURE 12 Direct-heading pump circulation solar water heater.
(DOE/CS-0011.)
Calculation Procedure:
