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[EnergyPlus_Support] Re: Pools in E+
Dear James,
I'm also interested in the calculation of evaporation from swimming pools, and have read a few of Shah's papers.
I'm still new in this forum ... is that spreadsheet you created available here in the forum?
Thanks,
Rui
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Jim Dirkes <jim@...> wrote:
>
> Dear Forum,
> A couple of weeks ago, upon responding to a post by Maxime, I attached a spreadsheet that was intended to help calculate pool evaporation. I have since cleaned it up quite a bit, updated the formulae to the most recent versions by Mirza Shah, and checked it fairly thoroughly. My great thanks go to Mr. Shah, who graciously and patiently offered guidance and input about his formulae.
> This spreadsheet:
>
> * Incorporates AHRAE-based psychrometric custom functions that you may find helpful for other purposes. They calculate both in SI and IP units. Thanks to Eric Kozubal of NREL for the original functions! (Eric, I found some small errors and have corrected them.)
>
> * Calculates evaporation for two pools (e.g., a swimming pool and a spa pool)
>
> o Occupied and unoccupied evaporation is shown for the indoor pools
>
> o Occupied and unoccupied evaporation is shown for outdoor pools based on TMY data. The result is a column of fractions which represent the percentage of evaporation compared to the maximum value. These can be used in a Schedule:File object. The biggest issue NOT addressed by the outdoor calculations is the impact of wind; I don't yet know how to do that, or even if it is a big factor.
>
> * Assumes that you will use IP units, but can easily be adapted to SI. (I have not had time or inclination yet to do so. :))
>
> I hope that this is helpful for all of my energy modeling colleagues! If you find any mistakes or add features, please consider sharing them with the forum! I'm sure it's not perfect, so you should carefully review results. I have, however, done a lot of checking and believe it is accurate.
>
>
> James V Dirkes II, PE, BEMP, LEED AP
> www.buildingperformanceteam.com<http://www.buildingperformanceteam.com/>
> Energy Analysis, Commissioning & Training Services
> 1631 Acacia Drive, Grand Rapids, MI 49504 USA
> 616 450 8653
>
> From: Jim Dirkes
> Sent: Monday, June 24, 2013 9:52 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: RE: [EnergyPlus_Support] Pools in E+
>
> Dear Maxime,
> I hesitate to send this because it is not organized very well ... but it's that or send nothing at all. Please be patient!
>
> 1. "Indoor Pool Calc" is a spreadsheet which uses the "Shah Method" for calculating pool evaporation. I include it for reference only.
>
> 2. "TMY-based Hourly Schedule Data" combines TMY data (Talahassee, Florida in this case) with the Shah method calculations to derive evaporation at each hour. This sheet includes psychrometric calculations as custom Excel functions. Frankly, I do not remember all of my assumptions, and would need to review the equations carefully in order to explain better. (I do not have the time to do so, at this moment, however. Sorry!)
>
> a. You can import TMY data for your site fairly easily by copying it from the .epw (TMY weather) file.
>
> b. The spreadsheet primarily uses IP units of measure. If you are using SI units, you may need to make some conversions.
>
> 3. For my project, I created two 8760 row .csv files from the spreadsheet which are called by EnergyPlus Schedule:File objects. One was used for the winter months when the pool water is heated. The other was used for summer months when the pool is not heated. They are used to provide the "Use Flow Rate Fraction Schedule" for WaterHeater:Mixed object.
>
> 4. I hope that is enough to get you started! If something is unclear after studying the information, please send a private message and I'll do my best to answer.
>
>
>
>
> James V Dirkes II, PE, BEMP, LEED AP
> www.buildingperformanceteam.com<http://www.buildingperformanceteam.com/>
> Energy Analysis, Commissioning & Training Services
> 1631 Acacia Drive, Grand Rapids, MI 49504 USA
> 616 450 8653
>
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of max4706
> Sent: Monday, June 24, 2013 10:19 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>
> Subject: [EnergyPlus_Support] Pools in E+
>
>
>
> Hello everybody,
>
> I am looking for some clues about modeling an outside swimming pool with E+. I don't know where to start actually. I created a zone, underground, with a large horizontal window which will allow me to simulate all the gains from solar radiation...
> I am trying to change the characteristics of the air (fluid) inside this zone, but I didn't manage to find where, or if it is possible.
>
> Is someone already done such a thing before ? Are there any feedback on this ?
>
> Thanks to all of you.
>
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