[Equest-users] Hot Water Usage Percent

Sefa Şahin ssahin at mimtarch.com
Thu Dec 3 06:42:04 PST 2015

Hi Nick,

For example: the annual ground water temperature is 60 F , delivery 
temperatures of SHW equipment is 120 F and the mixed fixture outlet 
temperature is 104 F. In this case, hot water percent is 73.3, cold 
water percent is 26.7. Is it true?
Our proposed design uses the heating hot water boilers to provide 
service hot water through a heat exchanger. Baseline case uses gas-fired 
water heater with storage tank. How can we calculate percent of hot 
water or cold water When delivery temperatures of proposed and baseline 
case are different? Additionally, How can we adjust Baseline service 
water storage temperature ?

Thank you for helping,

02.12.2015 21:18 tarihinde Nicholas Caton yazdı:
> I advise grabbing a copy of your project's reprequisite preliminary
> documentation (as occurring) to avoid conflicts in your calculations, then
> to leverage the 'Service Water Heating' tables in the Seciton 1.4 tables
> spreadsheet to work out the % of hot water consumption per fixture.  This
> will account for cold water usage.
> I typically leverage the annual ground water temperature (representative
> of cold water at delivery), the delivery temperature from the SHW
> equipment, and the mixed fixture outlet temperatures weight the % of hot
> water delivered for each fixture type consuming hot water.
> The spreadsheet will then calculate the "peak" gal/hr (provided the
> "annual equivalent hours" determined from your fractional schedule) w0hich
> you can easily convert to gal/min for equest input.
> It's a relatively easy number crunching exercise.  Hope that helps!
> Owner
> Caton Energy Consulting
>    306 N Ferrel
>    Olathe, KS  66061
>    office:  785.410.3317
> www.catonenergy.com
> -----Original Message-----
> From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On
> Behalf Of Sefa Sahin
> Sent: Wednesday, December 02, 2015 10:03 AM
> To: equest-users at lists.onebuilding.org
> Subject: [Equest-users] Hot Water Usage Percent
> Dear All,
> We have received the following  from GBCI regarding the energy modeling
> review:
> "The percent hot water listed in Table 1.4.5 does not appear to be
> calculated based on the storage and fixture supply temperature and
> adjusted to account for expected cold water only use"
> How can we adjust hot water usage percent?
> Thanks for all replies,
> Sefa Sahin
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Sefa Sahin

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