[Equest-users] Outdoor swimming pool and heater

[Elizabeth Gillmor]

I use bin calcs for this, though I am interested to hear if others have a
better way.  Total load = losses from evaporation + radiation +
convection.  Use 8760 data from your weather file to get OA DB, humidity,
solar radiation, wind speed etc.  Useful paper with equations here:
http://www.mmshah.org/publications/ASHRAE%202014%20Evaporation%20paper.pdf

>From my bin calcs I get a total annual load in Mbtu/year, then convert that
to Mbtu/hr for the days that the pool is open (which averages the load
across its operating period), and model that as a process load on a boiler
loop with an on/off schedule ("on" during the open season).  It's a
relatively OK estimate for a fuel rate that doesn't have a demand charge,
but might not be the best way for your electric pool heater if you have a
demand charge on your rate.

*Elizabeth Gillmor  PE, BEMP, LC, LEED AP*

*e n e r g e t i c s  **consulting engineers, llc*
energetics-eng.com | 303.619.0091

On Mon, Mar 28, 2016 at 9:42 AM, Christian Kaltreider <
ckaltreider at sudassociates.com> wrote:

> Rehana,
>
>
>
> Estimating the energy consumption of a pool heater can be very tricky.
> The dominant mode of heat loss is generally evaporation.  Some major
> influences include activity level of people using the pool
> (splashing/stirring increases evaporation), wind speeds, and the use of a
> pool cover.  The US DOE has some material on the subject:
> http://energy.gov/energysaver/gas-swimming-pool-heaters  There is a table
> on this page which I have used to back calculate and extrapolate heating
> requirements for a specific project as a sanity check.
>
>
>
> Also, ASHRAE HVAC Applications 2015 addresses pool heat loss starting on
> page 5.6.  The discussion is helpful and provides sound calculation
> methods, but they are more easily applied to indoor pools than outdoor
> pools.
>
>
>
> That’s all I have at the moment; hopefully you can find some additional
> resources.
>
>
>
> Good luck,
>
> Christian
>
>
>
> *From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] *On
> Behalf Of *Sunayana Jain
> *Sent:* Monday, March 28, 2016 8:23 AM
> *To:* Rehana Jiffrey; equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Outdoor swimming pool and heater
>
>
>
> Rehana,
>
>
>
> You can model pool heater load on electric meter (see image below) with
> winter months schedule:
>
>
>
>
>
> Thanks,
>
>
>
> *Sunayana Jain CEM, LEED AP BD+C*
>
> *From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] *On
> Behalf Of *Rehana Jiffrey
> *Sent:* Saturday, March 26, 2016 11:21 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Outdoor swimming pool and heater
>
>
>
> Dear All,
>
> I'm trying to model an outdoor swimming pool located at the roof top of a
> residential building. Pool heater (45Kw) operates from December to March (4
> months).
>
> I was wondering if anyone could help me how to model this scenario, and
> where to input these consumption values.
>
> FYI, this is my first time modeling an outdoor pool and pool heater.
>
> Thank you,
>
> Rehana.
>
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