[TRNSYS-users] VAV Air handlers

[ali shahrouzian]

Hello David,

Thank you for your reply.

My target goal is supplying only the required heat for a building during
the winter months. At this stage, I don't want to provide heat/reheat
through terminal units. So I need to turn off the cooling mode and define a
maximum/minimum heating supply air temperature for the VAV system. However,
the max/min cooling supply air temperature can be defined as inputs in Type
151 and 152. Add to this, I don't know how I can turn off the cooling mode
in these types.

I would appreciate it if you assist me in this regard.

Best regards,
Ali

On Mon, Jan 31, 2022 at 6:45 PM David BRADLEY via TRNSYS-users <
trnsys-users at lists.onebuilding.org> wrote:

> Ali,
>
>   Types151 and 152 can both heat and cool. In the kind of VAV that
> Types151 and 152 model there is a central unit that can provide heating,
> cooling and reheat. The terminal units can only provide heat/reheat. As
> long as one zone in the whole system requires cooling then the central unit
> has to be in cooling mode. Any zones that require heat will get that heat
> from their own terminal unit boxes. All the terminal boxes (except for the
> one that needs cooling) will back off as much as they can (to their minimum
> air flow rate) and will provide the heat needed. If *all* the zones need
> heat then the central unit's supply air temperature can move upwards.
>
> regards,
>
>  David
>
>
> On 01/31/2022 15:26, Ali Shahrouzian via TRNSYS-users wrote:
>
> Dear TRNSYS users,
>
>
>
> Hi,
>
>
>
> I am going to model a VAV air handler system to supply the heating load of
> a residential building over the course of the winter months. For this
> purpose, Type 151 and Type 152 components seem most appropriate .
>
> However, I noticed that they are designed (in TRNSYS code) in a way that
> are only suitable for meeting cooling needs.
>
>
>
> I was wondering whether these types (151 and 152) could be used to model a
> VAV air handler to meet heating demands as well? How?
>
>
>
> Best Regards,
>
> Ali
>
> _______________________________________________
> TRNSYS-users mailing listTRNSYS-users at lists.onebuilding.orghttp://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
>
> --
> ***************************
> David BRADLEY
> Principal
> Thermal Energy System Specialists, LLC
> 3 North Pinckney Street - suite 202
> Madison, WI  53703 USA
>
> P:+1.608.274.2577d.bradley at tess-inc.com
> http://www.tess-inc.comhttp://www.trnsys.com
>
> _______________________________________________
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>
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