[TRNSYS-users] humidity of vetilation air

[David BRADLEY]

Marion, thanks for answering that! interesting question and not 
something I had ever considered!

David



On 05/18/2018 04:44, Marion Hiller via TRNSYS-users wrote:
>
> Dear Karol,
>
> have set temperature to 20 and humidity to “relative humidity” and 
> “outside”. What will be value of ventilation air humidity?
>
>   * Type 56 does the following:
>     Example 1:
>     ambient air conditions: Tamb =  8 °C and RHamb = 80 %;
>     ventilation: Tvent = 20 °C and RHvent = outside
>
> Result: Type 56 calculates the resulting absolute humidity gain by 
> calling psychometrics kernel routine with that Tvent = 20 °C with 
> RHvent = 80 %
>
> Example 2:
>
> ambient air conditions: Tamb =  8 °C and wamb = 0.003 kg/kg
> ventilation: Tvent = 20 °C and wvent = outside
>
> Result: Type 56 uses wvent = wamb = 0.003 kg/kg  as the resulting 
> absolute humidity gain
>
>   * Thus, if you  want to take into account the condition process
>     which changes the relative humidity you have to
>
>   * calculate the changed rel. humidity acc. to temperature change by
>     an another component (AHU, Psychometrics) and
>   * give the changed rel. humidity as an input in the ventilation type.
>
> Kind regards,
>
> Marion
>
> *-----------------------------------------------------------------------------------------------------------------------------------------------------------*
>
> *Dipl.-Ing. Marion Hiller **
> **TRANSSOLAR Energietechnik GmbH *
> *Stuttgart - Munich - New York - Paris ***
>
> *t: +49.711.67976.0 <tel:%2B49.711.67976.27> f: +49.711.67976.11 
> <tel:%2B49.711.67976.11>*
>
> *www.transsolar.com/ <http://www.transsolar.com/>**
>
> **KlimaEngineering - Technologien für energieeffizientes Bauen und 
> Nutzerkomfort in Gebäuden
> Transsolar Energietechnik GmbH, Curiestrasse 2, 70563 Stuttgart *
>
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>
> *Von:*TRNSYS-users [mailto:trnsys-users-bounces at lists.onebuilding.org] 
> *Im Auftrag von *Karol Bandurski via TRNSYS-users
> *Gesendet:* Freitag, 18. Mai 2018 08:55
> *An:* trnsys-users at cae.wisc.edu
> *Cc:* Karol Bandurski <karol.bandurski at put.poznan.pl>; 
> TechSupport at tess-inc.com; hotline <hotline at Transsolar.com>
> *Betreff:* [TRNSYS-users] humidity of vetilation air
>
> Dear Experts,
>
> In Ventilation Type Manager in TRNBuild there is possibility to set 
> temperature of ventilation air to outside and also humidity to outside.
>
> I have set temperature to 20 and humidity to “relative humidity” and 
> “outside”. What will be value of ventilation air humidity?
>
> 1)Does TRNBuild calculate that by heating up or cooling down outside 
> air, to setting (20), the relative humidity also change?
>
> 2)If yes: Does TRNBuild take in to account that part of water will 
> condensate if outside relative humidity is high and set ventilation 
> temperature is much lower?
>
> Your respond will be helpful because it is not possible to direct 
> check it by simulation.
>
> Kind regards,
> Karol
>
> --------------------------------------------------------------------
>
> Karol BANDURSKI M. Sc.
>
> Faculty of Civil and Environemntal Engeneering
>
> Division of Heating, Air Conditioning and Air Protection
>
> Poznan University of Technology
>
> www.put.poznan.pl/~karol. bandurski 
> <http://www.put.poznan.pl/%7Ekarol.bandurski>
>
> https://www.researchgate.net/profile/Karol_Bandurski
>
>
>
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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 at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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