[TRNSYS-users] Dehumidification and natural ventilation

Sat Mar 14 01:06:22 PDT 2020

Thanks for the good advice, David! I implemented Type 168. My university only purchased High Temp. Solar Component Library and  Cogeneration Component Library from the  TESS Component Libraries, it seems. I guess I will have to ask them if they can purchase HVAC Component Library if I shall include dehumidification, or is there any other component from TRNSYS 18 or the TESS libraries I mentioned that we already have that I can use for this simple building?

Audun

Fra: David BRADLEY<mailto:d.bradley at tess-inc.com>
Sendt: Friday, March 13, 2020 kl. 11:22 PM
Til: TRNSYS users mailing list at OneBuilding.org<mailto:trnsys-users at lists.onebuilding.org>
Kopi: Audun Bull Kristiansen<mailto:audun.bull at hotmail.com>
Emne: Re: [TRNSYS-users] Dehumidification and natural ventilation

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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