Outdoor swimming pool and heater

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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.

Rehana Jiffrey's picture
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Joined: 2016-03-10
Reputation: 0

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.

Sunayana Jain3's picture
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Joined: 2016-03-29
Reputation: 0

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

Christian Kaltreider's picture
Joined: 2011-09-30
Reputation: 1

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

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

energetics's picture
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Joined: 2015-03-16
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I use the methodology described in the below link. It is pretty much close
to the ASHARE method and EPA's energy star performance rating technical
document.

http://www.rlmartin.com/rspec/whatis/studies_outdoor_inactive.htm

Jay

energyengineer81's picture
Joined: 2015-12-28
Reputation: 0

Thanks all. Ideas were helpful.
Now trying to figure out how much energy energy can be saved if a pool
cover is installed. It is possible to model this in equest?.

Rehana.

Rehana Jiffrey's picture
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Joined: 2016-03-10
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