Page 330 - Handbook of Energy Engineering Calculations

Bismarck, ND, and the following specifications apply:

Building
Location: 47°N latitude
2
Space-heating load: 15,000 Btu/(°F · day) [8.5 kW/(m · K · day)]

Solar System
2
2
Collector loss coefficient: F U = 0.80 Btu/(h · ft · °F) [4.5 W/(m · K)]
R C
Collector optical efficiency (average):

Collector tilt: β = L + 15° = 62°
2
2
Collector area: A = 600 ft (55.7 m )
c
2
Collector fluid flow rate: c /A = 11.4 lb/(h · ft (water) [0.0155 kg/(s ·
c
c
2
m )]
Collector fluid heat capacity—specific gravity product: c = 0.9 Btu/(lb ·
pc
°F) [3.8 kJ/(kg · K)] (antifreeze)
2
2
Storage capacity: 1.85 gal/ft (water) (75.4 L/m )
c
2
2
Storage fluid flow rate: /A = 20 lb/(h · ft )(water)[0.027 kg/(s · m )]
s
c
Storage fluid heat capacity: c = 1 Btu/(lb · °F)(water) [4.2 kJ/(kg · K)]
ps
Heat-exchanger effectiveness: 0.75
Climatic Data
Climatic data from the NWS are tabulated in Table 5.

TABLE 5 Climatic and Solar Data for Bismarck, North Dakota