[esp-r] Re: Adding HRV to model

[Alex Giroux]

Thanks for the reply. Unfortunately, simply reducing the air flow isn't
going to work. We're looking at both sensible and latent loads within the
zone, and reducing the airflow will also reduce the amount of moisture
brought in from the outside.

I need to find a way to precondition my ventilation air without affecting
the amount of moisture being brought into the zone. Right now I'm trying to
see if I can set up a second zone in my model as the "plant" - the plant
zone will bring in exterior supply air at a given flow rate, heat it, and
then the main zone will draw all it's ventilation air directly from the
plant zone. If I'm understanding this correctly, I can set up the control
loop in the plant zone to provide sensible control only, so the air
entering the main zone will have the same humidity ratio as the exterior
air.

Is this something that anyone has done before? Is there any other way to
set up an HRV in ESP-r without explicitly modelling all the heating and
cooling equipment within a zone?

Thanks.


On 3 December 2013 10:09, Jeremy Cockroft <jeremy at esru.strath.ac.uk> wrote:

>  Alex, keep it simple, as in this example:
>
> If your HRV is 80% efficient, and handles, say 100m3/h, then set your
> ventilation rate at 20m3/h (as this is all that you require to heat, the
> balance being recovered by the HRV).  You may have infiltration as well, as
> in your base case, to include.  This avoids all that pesky plant simulation.
>
> Regards,
>
> Jeremy Cockroft
>
>
>
> *From:* esp-r-bounces at lists.strath.ac.uk [mailto:
> esp-r-bounces at lists.strath.ac.uk] *On Behalf Of *Alex Giroux
> *Sent:* 03 December 2013 14:18
> *To:* esp-r
> *Subject:* [esp-r] Adding HRV to model
>
>
>
> Hi,
>
> I'm looking for information on how to simulate HRVs in ESP-r.
>
> I've got a house modelled, and I've run simulations to see what the loads
> are. I'd like to see how adding an HRV affects the loads on the house.
>
> I can't find any specific information about how to go about doing this
> though. Can I add in an HRV somehow to a model with an idealized plant,
> similar to the hybrid mechanical/natural ventilation example in ESP-r? That
> example has the plants to provide mechanical ventilation to the zones set
> up as separate zones and then I believe there's an airflow network set up
> between the different zones, but I think I'm missing some files.
>
> Thanks in advance.
>
>
>
> Alex Giroux
>
>
> --
> Alexandra Giroux, EIT
> MASc Student
> Mechanical Engineering
> University of Waterloo
>
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