[Bldg-sim] Therapy Pool Simulation

Sanjay Cholekar cholekar at yahoo.com
Tue Nov 3 05:07:20 PST 2009


Using IES

The approach I recommend for modelling gains from swimming pools is as follows. 1. Sensible heat gain. Represent the body of water as a room, maintained at a constant temperature. Represent the surface of the water as a window, consisting of a single pane with properties: transmittance=1, absorptance=0, reflectance=0, refractive index=1. This takes care of the sensible gain from the pool to the space above it. The software will of course generate a load for heating the pool, which you can either use or ignore depending on the aim of the study. You will need to set a low surface resistance for the construction representing the downward-facing side of the surface. Do this is APcdb by unticking the default box for either Inside or Outside Surface Resistance (as explained below) and typing in the value 0.01 m2K/W. You need to decide whether the downward-facing side is ‘inside’ or ‘outside’ by applying the convention that the inside surface is the one
 facing the room that appears first on the ModelIT browser. When you’ve made this change you’ll see surface temperatures close to those for the pool water. 3. Latent heat gain. Evaporation of pool water constitutes a latent gain to the space above. The software will not calculate this for you, but you can estimate it. An accurate estimate of this gain would take account of the vapour pressure difference between the pool (saturated) and the air, as well as the area of the pool surface (corrected for waves) and the area of wetted surfaces around it. Some of these parameters are difficult to estimate, and I recommend you use figures provided by equipment manufacturers. A number of these can be found on the web, and this one from Desert Aire is useful (see Table 3): www.desert-aire.com/pdf/AN/an10.pdf 
 Regards,


Sanjay Cholekar
+919326229841






________________________________
From: "Bishop, Bill" <wbishop at pathfinder-ea.com>
To: lasmith_architect.leed at yahoo.com; bldg-sim at lists.onebuilding.org
Sent: Tue, 3 November, 2009 6:30:38 PM
Subject: Re: [Bldg-sim] Therapy Pool Simulation

 
Larry,
 
I’ve modeled a natatorium in TRACE
but it shouldn’t be a problem in eQUEST. The pool is a latent load on the
space and also a water heating load. You will need to know/select the water
temperature, space temperature, space humidity and
ventilation rate. I suggest using the ASHRAE Handbook - Applications p4.6 for
guidance, as well as product literature for natatorium air handling systems. For
water heating, you will have to make up the latent load as well as account for emptying/refilling
the pool for regular cleaning.
 
Regards,
Bill
 
William Bishop, EIT, LEED® AP |Pathfinder Engineers &
Architects LLP
Mechanical Engineer
 
134 South Fitzhugh Street
Rochester, NY 14608
T: (585) 325-6004 Ext. 114
F: (585) 325-6005
wbishop at pathfinder-ea.com
www.pathfinder-ea.com
PPlease strive to live
sustainably.

________________________________
 
From:bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jeff Haberl
Sent: Monday, November 02, 2009
9:29 PM
To: 'lasmith_architect.leed at yahoo.com'; 'bldg-sim at lists.onebuilding.org'
Subject: Re: [Bldg-sim] Therapy
Pool Simulation
 
FYI. 

We tried to simulate this back in 1985 with DOE-2 by forcing the loads to equal
measured amounts and got somewhat close. Measured data included the pool
evaporation rate and ice rink refrigeration load. This was published in an
ASHRAE Transactions paper. 

Also, there are some papers published on predicted evaporation rates from
exposed pools. Several are listed in the apx to the FCHART manual. 

Otherwise, you can guess. 

Jeff 
BB 8=! 8=) :=) 8=) ;=) 8=) 8=( 8=) :=') 8=) 8=) 8=? BB 

Jeff S. Haberl, Ph.D., P.E., FASHRAE...................jhaberl at esl.tamu.edu 

Professor......................................................Office Ph:
979-845-6507 

Department of Architecture.......................Lab Ph: 979-845-6065 

Energy Systems Laboratory.......................FAX: 979-862-2457 

Texas A&M  University ..............................77843-3581 

College Station , Texas , USA .......................URL:
www-esl.tamu.edu 

BB 8=/ 8=) :=) 8=) ;=) 8=) 8=() 8=) 8=? 8=) 8=) 8= BB 

________________________________
 
From:
bldg-sim-bounces at lists.onebuilding.org
<bldg-sim-bounces at lists.onebuilding.org> 
To: bldg-sim at lists.onebuilding.org
<bldg-sim at lists.onebuilding.org> 
Sent: Mon Nov 02 18:17:15 2009
Subject: [Bldg-sim] Therapy Pool
Simulation 
Has anyone used EQUEST to simulate an
indoor pool or therapy pool performance?  If so please provide
some pointers.  If not what program would you suggest using?
 
Larry Smith
Architect  Energy Consultant
lasmith_architect.leed at yahoo.com
phone 206-218-2572
fax 206-905-0812

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