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  1. #1
    Join Date
    Jul 2014
    Location
    London
    Posts
    5
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    Kitchen heat recovery for the purpose of DHW (pre-)heating

    Hello HVAC community,

    I am looking for reliable and hassle free heat recovery system for commercial kitchens.

    I would like to use for the purpose of (pre-)heating hot water.

    All solutions that I found so far get clogged up with grease relatively quickly and had to be remover shortly after installations.

    I wonder whether you have heard / have experience with any heat recovery system that works properly in the kitchen environment?

    Kind regards

    dolph82

  2. #2
    Join Date
    Jul 2018
    Location
    Wisconsin
    Posts
    337
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    Look up PowerPipe. I believe they sell it a Home Depot. Only issue I could see with this is the pressure drop thru the heat exchanger.

    Sent from my SM-G920R4 using Tapatalk

  3. #3
    Join Date
    Jan 2009
    Location
    SE Iowa
    Posts
    5,571
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    I don't see any solution that won't clog up that would transfer any meaningful percentage of heat to get a payback. Plus a lot of the energy is latent heat, so you'll have a condensation and frost issue as well.


    Honestly, if you have the newer style hoods with makeup air at the point of exhaust, you mostly eliminate the preheat requirement for the makeup air.

  4. #4
    Join Date
    Jan 2010
    Location
    Sea to Sky
    Posts
    2,603
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    How many walk in coolers and freezers do you have? We can install a small refrigeration rack with heat reclaim.

    Kidding.....a little cost prohibitive.

    Sent from my SM-G965W using Tapatalk

  5. #5
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    8,833
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    Quote Originally Posted by motoguy128 View Post
    I don't see any solution that won't clog up that would transfer any meaningful percentage of heat to get a payback. Plus a lot of the energy is latent heat, so you'll have a condensation and frost issue as well.


    Honestly, if you have the newer style hoods with makeup air at the point of exhaust, you mostly eliminate the preheat requirement for the makeup air.
    Here is a guy from the past with a new address. Going after the kitchen heat is tough. There is a lot of grease involved.
    The heat from your coolers and freezers is much hotter and may heat most of your water.
    There are used by many.
    https://www.thermastor.com/heat-recovery-water-heaters/
    How did that attic in Iowa turn out?
    Regards Teddy Bear
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  6. #6
    Join Date
    Jan 2009
    Location
    SE Iowa
    Posts
    5,571
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    I ended up moving to Michigan. Bought 2 homes there. Replaced 1 AC and furnace and downsized it in half. Super comfortable now. Then moved back 2 blocks away from my previous house. Now I have a 1 pipe steam vapor system that Ive got purring like a kitten at <0.5oz with 2 heat pumps systems added for central air and shoulder season. Its a 1905 3300sqft brick victorian. Full basement with cut stone foundation. Original windows. Full unfinished attic with 13 ceilings in the middle.

    Have another unvented attic. Try something different that Ill have to detail at a later time.

    Big news is Im seriously looking at finally becoming a service tech. More on that later.

  7. #7
    Join Date
    May 2014
    Location
    Bay Area California
    Posts
    19,067
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    Quote Originally Posted by Spitz View Post
    Look up PowerPipe. I believe they sell it a Home Depot. Only issue I could see with this is the pressure drop thru the heat exchanger.

    Sent from my SM-G920R4 using Tapatalk
    Do they have Home Depot in London?
    If you were a real tech, you'd solder a relay on that board and call it good to go.

    I do a triple evac with nitro to remove non condensables.

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