[Equest-users] Huge electrical consumption for DHW

[Morteza Kasmai]

Yes, the proposed model has electrical water heaters, 39 units for
residential (one for each apartment) and 4 units for non-residential spaces.



Thanks for your help,

Morteza





On Mon, Jul 22, 2013 at 1:32 PM, Busman, Michael R <MBusman at chevron.com>wrote:

>  Morteza,****
>
> ** **
>
> You can find information in the ASHRAE 2011 HVAC Applications Handbook.
> Start in chapter 50 about 50.12 and 50.14.  If you don’t have access to the
> handbook, your mechanical engineer should have it and could maybe review
> with you what the daily gallons of usage should be in addition to a simple
> hand or spreadsheet calc of kWh as a comparison number.  I would definitely
> suggest focusing on the sf/occupant and laundry usage as well as the other
> items I listed below.  Finally, if you are modeling an existing building
> and can get historical electric consumption and demand data, I would use
> that to try and calibrate the model to the historical data.  By the way, is
> electric resistance water heating included in the proposed model?****
>
> ** **
>
> Mike****
>
> ** **
>
> *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****
>
> Fax     714-671-3438****
>
> eFax   866-420-0335 (Include my Full Name followed by "CAI:MHTZ" on Cover
> Sheet)****
>
> Mobile 310-387-2083****
>
> mbusman at chevron.com****
>
> ** **
>
> ** **
>
> ** **
>
> *From:* Morteza Kasmai [mailto:morteza.kasmai at gmail.com]
> *Sent:* Monday, July 22, 2013 9:55 AM
> *To:* Busman, Michael R
> *Cc:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Huge electrical consumption for DHW****
>
> ** **
>
>  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****
>
> Fax     714-671-3438****
>
> eFax   866-420-0335 (Include my Full Name followed by "CAI:MHTZ" on Cover
> Sheet)****
>
> Mobile 310-387-2083****
>
> mbusman at chevron.com****
>
>  ****
>
>  ****
>
>  ****
>
> *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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