[TRNSYS-users] Dehumidification and natural ventilation

[David BRADLEY]

Audun.

1.  There are a number of dehumidifier models available in the TESS HVAC 
library.

2. and 3. Since you are dealing with a relatively simple shape of 
building, you might look at Type168 (if you are using Trnsys18). That 
model is a good bit simpler to implement than either TRNFlow or CONTAM. 
If it is too simplistic then it might at least give you an idea as to 
whether natural ventilation is feasible. If it is, then you could move 
on to one of the more complex tools. My preference is for CONTAM but 
that is really only because I started out using CONTAM and so am more 
familiar with it. One reason to use TRNFlow, though, would be that you 
can define CO2 as a "contaminant" in TRNFlow and track its concentration 
level.

kind regards,

  David


On 03/13/2020 04:49, Audun Bull Kristiansen via TRNSYS-users wrote:
>
> I have three questions:
>
>  1. Is it possible to model a dehumidifier (stand-alone room unit as
>     in the attached picture) in TRNSYS? I model a tiny home made from
>     a single shipping container with an air-to-air heat pump (Type
>     119c). During the summer I lower the temperature to dehumidify the
>     air, but when there isn’t any cooling need in the room it would be
>     good to have an option to dehumidify the air without cooling the
>     entire room.
>  2. The container has a glass door and two windows, so it is a good
>     potential to use natural ventilation for cooling part of the year.
>     Can you give me some recommendation on how to model this when my
>     main goal is to study changes in indoor temperature and cooling
>     load? I have TRNFlow. I also see that some researchers use a
>     co-simulation with CONTAM Type 97 or Type 98. For now I modelled
>     it as another ventilation component with zero SFP in Type 56 with
>     an input that is based on time, indoor temperature and ambient
>     temperature from a calculator.
>  3. It would also be nice to have a report of the CO2 concentration in
>     the room, to see if the ventilation is sufficient. But I can not
>     see that I can select that as output in TRNSYS?
>
> Kind regards Audun
>
> Ph.D. student at Shanghai Jiao Tong University
>
>
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
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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