[TRNSYS-users] TRNSYS-users Digest, Vol 149, Issue 9

Thu May 4 09:09:50 PDT 2017

Please is it possible to exclude this mail from your mail list?

Best regards,

Diogo Remoaldo

On Thu, May 4, 2017 at 5:08 PM, via TRNSYS-users <
trnsys-users at lists.onebuilding.org> wrote:

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>    1. Re: pls give me your comments (David BRADLEY via TRNSYS-users)
>
>
> ---------- Forwarded message ----------
> From: David BRADLEY via TRNSYS-users <trnsys-users at lists.onebuilding.org>
> To: ahmad abbasian <ahmadabbasiansbu at outlook.com>, "TRNSYS users mailing
> list at OneBuilding.org" <trnsys-users at 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 abbasianzadeh
> Solar energy Researcher
> *Harrisburg, 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 <(608)%20274-2577>
> F:+1.608.278.1475 <(608)%20278-1475>d.bradley at tess-inc.com
> http://www.tess-inc.comhttp://www.trnsys.com
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