Swimming Pool Dehumidifcation

[jojoA]

Can anyone help me in determining how much cooling would be required in dehumidifcation a pool room. I understand the ASHRAE formula determining the evaporation rate of a swmming pool. This give you a water quantity in lb/hr that is evaporated into the air. Therefore, do I mulitply this amount by the latent heat of vaporization 1,050 Btu/lb of water, to determine the latent cooling load required on the cooling coil.

 

[MintJulep]

There was a very good article on HVAC for natatoria in ASHRAE Journal a few years ago.

Reprints should still be available from ASHRAE.

 

[NCDesign]

Check out Desert-Aire look under the technical literature column and you will find a ton of useful information. A lot of it is product focused. (What would you expect it's a manufacturers website?) But towards the bottom they have some good guides on sizing units for different applications.

 

[trashcanman]

Check out POOLPAK's website. They have a neat sizing program that I use all the time. You input the sensible heat gains & losses, room size & height, pool area, no. of people and it does the rest. Note that design temp for pool room is 82 DB, 60% RH.

 

[jojoA]

Thank you all for responding. I tried each of your suggestions & briefly: 1)ASHRAE does not have web accessible past issues, so it's very difficult finding the exact ASHRAE journal month. 2) Desert-Aire basically re-hashes what ASHRAE prescribes in determining amount of moisture evaporated. 3)Poolpak was too product biased.

I figured this is a fundamental question HVAC engineers should be able to understand, without a mfr's support.

 

[NCDesign]

I figured some additional reference material might be handy.
If we should be able to understand it without mfr's or others support why ask the question? You should already know the answer.

To directly answer your question. No, that only gets you part of the way there. You still have latent load from people and outside air.

 

[MintJulep]

And you have to decide what humidity you want in the natatorium. And the evaporation is a function of the humidity in the natatorium, so the process becomes itterative.

 

[ChrisConley]

ASHRAE formula for Evaporation:

Evaporation Rate = (0.1)xArea x (Vw-Vp)Activity Factor

Activity Factor varies from 0.5 to ~2 depending on application.

I use a spreadsheet to determine Vw and Vp at various temperatures (Vp is dependant on air temp and humidity, Vw is dependent on pool water temperature).

Once you have the spreadsheet you can vary pool air and water temperature as well as pool humidity to see the effect it has on evaporation rate.

Good luck!

 

[AbbyNormal]

Ever deal with an Ed Zacharis? He was a prairie boy.


He gave me a Dectron manual years back. Maybe he is retired now.

Take the "V" out of HVAC and you are left with a HAC(k) job.

 

[walkes]

Ed Zacharias is still working at it, at least he was in December.
Enersol Distributors Ltd
3-327 Pembina Hwy
Winnipeg MB, R3L 2E3

Phone: 204-474-5170
Fax: 204-474-5173