[Equest-users] Huge electrical consumption for DHW

[Morteza Kasmai]

 Mike,

Thank you so much for your respond.

All the inputs are eQUEST defaults; with your suggestions I have to revise
them. I reviewed Section 7 of ASHRAE 90.1-2007, but I couldn't find related
data for the baseline model. I have the exact data for the proposed model
based on the MEP engineer calculations but if I input those data for the
baseline model the project will not achieve any savings from this category.
It would be very helpful if you let me know where I can find these data.

Regards,

Morteza





On Mon, Jul 22, 2013 at 10:43 AM, Busman, Michael R <MBusman at chevron.com>wrote:

>  Morteza,****
>
> ** **
>
> I took a very quick look at some of the inputs in wizard mode.  Some of
> the input assumptions appear to be on the high side and I’d suggest
> double-checking.  ****
>
> ** **
>
> **·         **20 gal/person****
>
> **·         **sf/person – many of the spaces have an allocation of 100 or
> 200 sf/occupant, which might overstate the number of occupants****
>
> **·         **10 laundry loads/week/apartment – It’s been many years
> since I’ve had little ones or teenagers in the house, so my memory isn’t
> too clear on how many loads/week we used to do, but this seems on the high
> side, but I could be wrong and worth checking.****
>
> **·         **I noticed 2 DHW heaters defined, one at 135 deg. and the
> other at 110 deg.  I didn’t look at the input file so I don’t know how
> these get assigned or if both get assigned or just the first heater.  135
> deg. for residential use is high if you want to avoid scalding and will
> also overstate your kWh.****
>
> **·         **Finally, I’d suggest reviewing ASHRAE service hot water
> heating requirements.  They indicate *average* daily DHW usage for
> apartments of about 40 gal/apartment and *maximum* usage as high as 80
> gal/day.  Please note that the numbers are based on *OLD* data before low
> flow fixtures and devices became common.  So a comparison to the ASHRAE
> numbers should be made with the ASHRAE numbers bumped down.****
>
> **·         **I think the ASHRAE chapter on DHW also charts typical
> hourly usage.  You might want to check versus your DHW schedule.****
>
> ** **
>
> I hope the above helps or maybe gets you on the right path.****
>
> ** **
>
> My best,****
>
> ** **
>
> Mike Busman****
>
> ** **
>
> ** **
>
> *Michael R. Busman, CEM*****
>
> Lead Project Engineer II****
>
>  ****
>
> *Chevron Energy Solutions*****
>
> A Division of Chevron U.S.A., Inc.****
>
> 145 S. State College Blvd.****
>
> Brea, CA  92821 ****
>
> Direct  714-671-3561****
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>
> ** **
>
> ** **
>
> ** **
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Morteza Kasmai
> *Sent:* Sunday, July 21, 2013 9:29 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Huge electrical consumption for DHW****
>
> ** **
>
> ** **
>
> Dear eQUEST experts,****
>
> I have Electrical Water Heater for the Residential and Non-residential
> parts of this model. I allowed eQuest to auto-size domestic hot-water use.
> BEPS report shows huge electrical consumption for DHW, more than the total
> consumptions of all others. Is there something wrong?****
>
> Please find the attached pd2 and inp files of the project.****
>
> Your comments would be greatly appreciated.****
>
> Morteza ****
>
> ** **
>
> ** **
>
> ** **
>
>
> ****
>
> ****
>
> ** **
>
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