This discussion forum is to attempt to answer Steve's question regarding better ways to model domestic hot water systems.  Here is his question.

 

"Things appear rather quiet over here in Building Simulations, so I thought I might stir up some discussion on the subject of DHW storage temps, as they apply to dishwasher usage. Cruise on over to "Top-10 just launched" on the home page under Forums and go down to "comments" where J.C. and I went somewhat off topic with a discussion of DHW temps. I'm reasonably sure simulations would support maintaining DHW @ 115-120 F, and using electric heat in the DW to boost the temp as the most energy efficient approach, but have found no difinitive study. I suspect this issue has been settled, but would appreciate your thoughts and the results of any simulations you may have run or encountered. "

Views: 55

Replies to This Discussion

Perhaps time to put this situation aside and move on. While I never did locate a rigorous study, the sheer volume of information advocating booster electric heat in the dishwasher vs maintaining a higher DHW storage temp would seem to support the former as the preferred approach. I believe Energy Star DW's use less than 10 gallons of dihydrogen monoxide and the delta T should be on the order of 20-25 degrees, so probably no big deal...unless your fuel source is dollar bills.

Still, would have liked to see results from running a "what if" program...

RSS

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.  Home Energy Pros is sponsored by the Better Buildings Residential Network.

Latest Activity

Chris Dorsi updated an event
Thumbnail

2015 Habitat X Summer National Conference at Big Sky Resort

July 21, 2015 to July 23, 2015
The 2015 Habitat X Summer National Conference will take place at Big Sky Resort, just down the road…See More
5 hours ago
Mike Cerqua replied to Tony Hicks's discussion Slab-on-grade Insulation
" "
7 hours ago
Mike Cerqua joined James Sayers's group
Thumbnail

Marketing Energy Efficiency

Sharing ideas, tools and examples of promoting energy efficiency to consumersSee More
8 hours ago
Mike Cerqua joined Sean Lintow Sr's group
Thumbnail

Best Practices (Residential)

Best Building, Retrofitting, or even Auditing Practices - what are they, what should change, what…See More
8 hours ago
Profile IconMike Cerqua and john mitchell joined Leslie McDowell, BPI's group
Thumbnail

Building Performance Institute (BPI)

BPI is the nation's premier standards development, quality assurance and credentialing organization…See More
8 hours ago
Mike Cerqua joined Michael Stuart's group
Thumbnail

INFRARED THERMOGRAPHY USERS

This group is dedicated to knowledge sharing and discussion of infrared thermography for building…See More
8 hours ago
Mike Cerqua commented on Mike Cerqua's photo
Thumbnail

1468701_10153490382175195_341120974_n

"Getting good use out of our sprayfoam truck! Brought the small cellulose machine and 15 bags for a…"
8 hours ago
Mike Cerqua posted a photo

Our Sprayfoam Truck looking its best...

I dream of a day where all sprayfoam trucks carry equipment like this!
8 hours ago

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service