| TABLE 6:
Heating, Venting and Cooling Calculations |
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Comments |
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| VENTILATION: |
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| Greenhouse
Volume Calculation: Width (11.25') x Length (16') x Average Height (8') |
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| = |
1440 |
Cubic Feet |
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16" Fan rated for 2240 CFM |
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| Multiply volume by 0.75
for your fan CFM (Cubic feet per minute) |
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Note: Sundance doesn’t use this
factor. |
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| = |
1080 |
Cubic Feet (recommended fan size) |
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16" GP rated for 2240 CPM
(Cubic feet per minute) |
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| Shutter
size: Divide fan size by 250 then by
2 shutters for square feet of shutters. |
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| = |
2.16 |
Square feet. Multiply by 144 sq. in. per sq. ft. and
take the square root: |
(2) 20" Shutters with hoods |
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| = |
17.64 |
inches --> round up to
(2) 20" shutters. |
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Option (motorized closure for
cold weather |
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areas) |
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| HEATING
See http://www.h2othouse.com/html/GreenhouseTemp.html for
an article on Greenhouse
Temperatures. |
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| Total
wall and roof surface area = 2 x (16'x8'roof + 5'x16'sides + 11'x8'ends) |
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| A = |
592 |
square feet |
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| Temperature
difference between coldest outdoor winter temperature and night |
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| temperatue desired in greenhouse |
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| D = |
50 degrees -7 degrees = 43 |
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| Formular
to calculate Btu's = A x D x 1.1 - 30% if using twin wall and - 30% if
attached. |
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| Btu's = |
20057 |
Btu's assuming twin wall. |
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Vented recommend for growing
Orchids. |
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Recommend "Southern Gas
Burner" Model # C-1(non-vented).
Available from Sundance supply.
The Model A-1 is vented and rated for 25,000 BTU. |
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Note: This heater (Model C-1) is rated for 25,000 BTU's which will
allow you to keep the greenhouse at 50 degrees with an outdoor temp. of 8
deg. |
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| MISTING |
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| For
cooling and humidity control. One 2
or 3 gph nozzle for every 12 to 14 sq. feet. |
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# Nozzles = 11.25 feet x
16 feet / 14 sq.ft per nozzle = |
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| # Nozzles= |
13 |
nozzles |
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| or one Hydrofogger rated for 250 sq. ft. |
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Framing |
$
384.36 |
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Foundation |
$
428.50 |
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Glazing/Trim |
$2,343.00 |
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Heating, Venting, Shading, Misting |
$1,440.52 |
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Electrical |
$
349.00 |
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Piping |
$
28.00 |
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Total |
$4,973.38 |
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