Page 336 - Handbook of Energy Engineering Calculations

P . For liquid heating systems using solar energy as their heat source, the
L
monthly solar fraction is given by

if P > P /12 (if not, f = 0).
s
s
L
For air-based solar heating systems, the monthly solar heating fraction is
given by

if P > 0.07P (if not, f = 0).
L
s
s
Flow rate, storage, load heat-exchanger, and domestic hot-water correction
factors for use in the equations for P and P , in steps 1 and 2 above, are
s
L
given in Table 11 and Fig. 11.