Simple procedure for schematic design of passive solar buildings Page: 3 of 19
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6ENERAL CLIMATIC CONSIDERATIONS
Iaportant Heather Parameters
The heating degree days (DO) value for a period of 1 day 1s calculated
oy summing the difference between the base temperature of interest ana tne
outside ambient temperature for each nour of tne day. If an nourly difference
happens to be negative, we set 00 equal to zero for triat particular hour.
Using this procedure for determining the dally DO, one can easily obtain the
heating degree dsys for a time period of arbitrary lengtn, say a month or a
year, simply by summing the dally contributions tnat occur during the period.
Consequently, the amount of heat required to maintain a building at tne base
temperature (in the absence of internal sources) for one montn 1s given oy
\ - TLC • W (Btu) , (1)
where TLC (Btu/*F day) is tne total load coefficient of tne budding ana DO is
the number of degree days occurring during tne month. Tne total load coeffi-
cient Is defined as the amount of heat required to maintain a 1*F difference
between the inside and outside ambient temperatures fer a period of 24 nours.
The heat load for the entire heating season 1s obtained simply by adding tne
montnly loans given ty Eq. (1). Thus, DU is an important climate parameter
because 1t 1s d1recti.' proportional to tne oullolng heat load. Tne units of
degree days are aF day.
Tne amount of solar radiation, VT2, tnat 1s transmitted tnrougn 1 ft2 of
a vertical, soutn^fadn], double-glazed aperture during a given montn 1s a
second Important weatner parameter. The parameter VT2 1s important because it
quantifies the solar ~esou’ace available for passive space neating. In she
following section we will show that various combinations of the parameters VT2
end DO can be used t* characterize climates with regard to tne relative impor-
tance of conservation and passive solar measures for reducing auxiliary heat
consuptlon.
Climate Regions Based on Importance of Conservation Measures
The fraction of tne total monthly heating load of a building that can be
met by passive solar strategies depends on certain features of tne building
design rod the weatner parameter S/00, where S 1s the monthly solar radiation
absorbed by the passive system. Depending on the building characteristic*, "ana
2
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Wray, W.O. & Kosiewicz, C.E. Simple procedure for schematic design of passive solar buildings, report, January 1, 1984; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1102988/m1/3/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.