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A word about Design Day and not-so-warm homes.

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  • dabrakeman
    dabrakeman Member Posts: 976
    https://forum.heatinghelp.com/discussion/comment/1887400#Comment_1887400

    What did you use for a design day temperature on the dog house?

    GGrossChrisJbjohnhy
  • GGross
    GGross Member Posts: 1,829
    https://forum.heatinghelp.com/discussion/comment/1887724#Comment_1887724

    doghouse design day = sweater+wool socks

    ChrisJPC7060
  • ChrisJ
    ChrisJ Member Posts: 17,258
    https://forum.heatinghelp.com/discussion/comment/1887787#Comment_1887787

    He's got a steam system, so it's easy enough to put a steam radiator in the dog house and valve it off in the basement, just make sure it drains good enough.

    Perfect solution.

    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

    GGrossdabrakemanmattmia2
  • Kaos
    Kaos Member Posts: 857
    edited February 13
    https://forum.heatinghelp.com/discussion/comment/1887698#Comment_1887698

    Just to provide a real world counter point to Nate. I'm located with an outdoor design temp a couple of F warmer than Minneapolis.

    Large part of the house is uninsulated double brick construction with original cast iron rads. No issues with keeping the place warm down to my design outdoor temps with an air to water heat pump without aux heat. Larger spell bellow design temp does use aux heat along with the heat pump but only because the higher temperatures the rads need.

  • jesmed1
    jesmed1 Member Posts: 1,419
    edited February 13

    @Kaos Just curious, what ATW heat pump do you have? I looked at those for our old gravity conversion system with large cast iron rads, but the install prices we got quoted for ATW's were insane. Our design heat loss is about 100,000 BTU/hr.

  • hot_rod
    hot_rod Member Posts: 27,237
    https://forum.heatinghelp.com/discussion/comment/1887698#Comment_1887698

    as I mentioned I use his data for the temperature info, not a hp selector

    I look at it as a just a guide, all systems need to be designed to match equipment with the specific applications. HPs are certainly less forgiving no doubt

    Maybe that is why there was a HPWH with a gas condensing burner in the lower 1/3 at AHR😗

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Steve Minnich
    Steve Minnich Member Posts: 2,878

    For me, I usually stuck to the book when it came to heat loss and design days, but I can’t tell you the amount of customers I had within the City of Chicago who kept their thermostats at 84 degrees all winter long and that would be their expectation on the new boiler, usually older folks.
    Then, at some point, someone else moves into that house and complains that some knucklehead installed a grossly oversized boiler. These were in poorer neighborhoods where cast iron was the only option so modulation or multiple smaller boilers weren’t an option. Outdoor reset can only do so much.

    Steve Minnich
    bjohnhy
  • Big Ed_4
    Big Ed_4 Member Posts: 3,482

    Most lack of temperature calls are caused by added heat loss like open unused AC defusers and window units. The other is blocked radiation .. Common sense has to be learned I always say ..

    This year any system installed by math will be questioned ..

    There was an error rendering this rich post.

  • Kaos
    Kaos Member Posts: 857
    https://forum.heatinghelp.com/discussion/comment/1887798#Comment_1887798

    I have a Dettson branded Gree unit:

    https://www.dettson.com/en-ca/products/heat-pumps/gree-r32/versati-iv.aspx

    There are larger units but you would still need multiple ones to meet your heat load. Add on the fact the your local power is very expensive, I can't see this making sense unless you are looking to split the heat to each unit and have them sub metered.

    jesmed1

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