On Thu, May 4, 2017 at 5:08 PM, via TRNSYS-users <trnsys-users@lists.onebuilding.org> wrote:
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Today's Topics:
1. Re: pls give me your comments (David BRADLEY via TRNSYS-users)
---------- Forwarded message ----------
From: David BRADLEY via TRNSYS-users <trnsys-users@lists.onebuilding.org>
To: ahmad abbasian <ahmadabbasiansbu@outlook.com>, "TRNSYS users mailing list at OneBuilding.org" <trnsys-users@lists.onebuilding.org>
Cc:
Bcc:
Date: Thu, 4 May 2017 11:08:33 -0500
Subject: Re: [TRNSYS-users] pls give me your comments
Ahmad,
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.
kind regards,
David
On 05/02/2017 12:36, ahmad abbasian via TRNSYS-users wrote:
Dear All
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
............................................................ .............................. .... Ahmad abbasianzadehSolar energy ResearcherHarrisburg, Pensylvania
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-- *************************** 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 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com
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