[Equest-users] Natatorium/Pool

[RobertWichert]

One more thing...

If the pool is uncovered, the night sky radiation losses are not 
insignificant.  I believe that the "energyexperts" data takes this into 
account.




Robert Wichert P.Eng. LEED AP BD&C
+1 916 966 9060
FAX +1 916 966 9068







===============================================

On 3/29/2014 2:00 PM, Riley Beise wrote:
>
> Tom,
>
>
> Here's how I do it: (geez it looks long now that I've written it, but 
> it's really not bad and I feel it does a good job)
>
> 1.Determine your peak evaporation rate (lb/hr) for the pool(s) within 
> the natatorium
>
> a.Should be available from the pool designers or if not, see the 
> Natatorium section in ASHRAE Handbook -- HVAC Applications section 5 
> (Places of Assembly).
>
> b.Values will depend largely on water temperature and peak "Activity 
> Factor" expected, but ballpark values are
>
> i.Lap pool: 0.05 lb/hr per ft² of water surface area
>
> ii.Leisure pool: 0.2 lb/hr per ft² of water surface area (warmer than 
> lap and higher activity factor (more splashing = more evaporation))
>
> iii.Swirl or Hot Tub: 0.4 lb/hr per ft² of water surface area (hot, 
> with jets)
>
> 2.Create a schedule to represent the pool evaporation rate during 
> different usage scenarios (different activity factors, different 
> evaporation rates).
>
> a.I use three modes of operation:
>
> i.Unoccupied and uncovered: approx.  0.3
>
> ii.Occupied and low use: approx. 0.7
>
> iii.Occupied and high use: 1.0
>
> 3.Create an Internal Energy Source within your natatorium space with 
> the magnitude equal to the peak evaporation rate, but in Btu/hr (1000 
> Btu/lb of water evaporating), and make the load 100% latent, 0% 
> sensible like so:
>
> 4.Now create a process heating load on your heating water loop and 
> apply the same schedule.  The magnitude of the load is calculated as:
>
> a.Pool water heat loss to evaporation (equal to evaporation "Internal 
> Energy Source"), PLUS
>
> b.Heating energy required to heat the makeup water from DCW inlet up 
> to pool water temperature. This is accounting for heating the fresh 
> water that is replacing the water lost due to evaporation (in the 
> range of 140 Btu/hr per lb/hr of water depending on your makeup water 
> and pool water temps)
>
> c.Note that this assumes that 100% of the heat required for 
> evaporation at the pool's surface is provided by the pool water's 
> heat, where in reality it is expected that some component comes from 
> the air, though I expect it is a small component.
>
> 5.Set min and max RH in your AHU and you're done.
>
> And if you felt there was significant heat loss through the pool wall 
> to the ground, you could add that in as well, though I think that it 
> probably isn't when compared to the energy involved in evaporation.
>
> *Riley Beise*, P.Eng., BEMP, LEED Green Associate
>
> Energy Analyst
>
> *AME Consulting Group*
>
> *721 Johnson Street*
>
> *Victoria, BC, V8W 1M8*
>
> p.  250-382-5999
>
> *From:*RobertWichert [mailto:robert at wichert.org]
> *Sent:* Saturday, March 29, 2014 8:44 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Natatorium/Pool
>
> Well, it's not EQuest, but it's on topic:
>
> http://energyexperts.org/CalculatorsTools/PoolEnergyUseCalculator.aspx
>
>
>
> Robert Wichert P.Eng. LEED AP BD&C
> +1 916 966 9060
> FAX +1 916 966 9068
>   
>   
>   
>   
>   
>   
>   
> ===============================================
>
> On 3/28/2014 11:49 AM, Tom Mickley wrote:
>
>     Does anyone have a simple, easy way to model an in ground pool and
>     spa for a natatorium?
>
>     Thanks,
>
>     Tom Mickley
>
>     Mechanical Engineer CEM
>
>     The K Company
>
>     Cell 330-760-3994
>
>     Office 330-773-5125
>
>
>
>
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