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.

Latest Activity

Michael Dunseith posted photos
4 hours ago
Kim Tanner's 2 videos were featured
8 hours ago
Martin Grohman's blog post was featured

Working with Roofing Professionals

GAF has introduced training called the Home Energy Saver Certificate - Building Science for the…See More
8 hours ago
Sean McLoughlin's blog post was featured

Programming in-floor electric radiant heat, is it worth it?

Does a programmable thermostat for an in-floor electric radiant heat system add efficiency, or is…See More
8 hours ago
Paul Raymer's 2 blog posts were featured
8 hours ago
Tony Hicks's discussion was featured

Slab-on-grade Insulation

Hi my name is Anthony Hicks, and I'm from Fort Wayne, Indiana. I work for a home building company…See More
8 hours ago
Larry Schaffert's discussion was featured

How to correctly insulate exterior wall in a 1900 house?

We are working with a homeowner who had frozen pipes over the winter.  Their home is a balloon…See More
8 hours ago
Bryan Pringle's discussion was featured

Dense packed cellulose in basement?

I am looking for advice on a project I would like to attempt in my own home. It is an 1840s cape…See More
8 hours ago

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service