Re: [TRNSYS-users] VAV Air handlers

[ali shahrouzian <ali.shahrouz@gmail.com>]

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@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

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David BRADLEY
Principal
Thermal Energy System Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

P:+1.608.274.2577
d.bradley@tess-inc.com

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

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