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<p>Ahmad,</p>
<p> It is certainly possible. I do not know how tall your
greenhouse is but supposing the zone height to be 15 feet a 500 m2
greenhouse has a volume of 80700 ft3. A 21000 cfm fan would
completely replace the greenhouse air volume once every four
minutes (approximately). I would therefore assume that the RH and
temperature of the greenhouse would quickly be equal to the
ambient RH and temperature.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 05/02/2017 12:36, ahmad abbasian via
TRNSYS-users wrote:<br>
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<p><span style="color: rgb(34, 34, 34); font-family: arial,
sans-serif; font-size: small;">Dear All</span></p>
<div style="color: rgb(34, 34, 34); font-family: arial,
sans-serif; font-size: small;">
I have used a 11250 kgr/hr of air (about 21000 CFM) for a 500
m2 greenhouse fan and pad cooling system. there were some
hours which the temperature of greenhouse reaches as low as 13
,so I have used another fan with same flow rate to be turned
on when the greenhouse temperature is below 15 to supply
outside air directly to greenhouse with no cooling, and the
fan of cooling pad is turned off at this hours. it has solved
the temperature problem but the relative humidity reaches to
low values. It seems wrong to me, because it occures in a
short time. I mean that supplying outside air to greenhouse at
a short period of time makes low relative humidity rapidly. Is
it true? please give me your comments </div>
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Ahmad abbasianzadeh</div>
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Solar energy Researcher</div>
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<b>Harrisburg, Pensylvania</b></div>
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<br>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
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