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Air to water heat pump system design

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Comments

  • DCContrarian
    DCContrarian Member Posts: 1,009
    edited January 21

    To put the BOM in perspective:

    Chiltrix has a price list on their website. I'm not advocating that particular brand, just that it's easy to look up pricing. And I don't feel I'm giving away any trade secrets, it's right there on the Internet. It's at:

    https://www.chiltrix.com/documents/price-list.html

    To do DHW, you need at a minimum an indirect tank and two 3-way valves. The 75 gallon indirect tank is $2299, the 93 gallon one is $3680. Three-way valves are $182 or $199 each, depending on which model of heat pump you have. So you're looking at a minimum of $2663 and possibly over $4000 just for parts. If the water tank is more than 30 feet from the heat pump you need a booster pump, which is another $329.

    For your money you get a system that is more complicated, doesn't deliver any more hot water, doesn't cost any less to operate, and doesn't take up any less space in the mechanical room.

  • JakeCK
    JakeCK Member Posts: 1,496
    edited January 21

    @Jamie Hall

    "R290 refrigerant, for those who haven't read the data sheet, is just a very highly refined propane. It is a good refrigerant — it has some very desirable properties from that standpoint. Unhappily, it also happens to be highly flammable as well. In fact, a somewhat cheaper and less refined version is sold as "LP gas" as a fuel. It forms explosive mixtures with air over a remarkably wide range of concentrations.

    A minor detail, perhaps."

    Jamie, thats why they call it propain, cause its gonna hurt when it blows up. Lol

  • DCContrarian
    DCContrarian Member Posts: 1,009
    https://forum.heatinghelp.com/discussion/comment/1836608#Comment_1836608

    I got Jamie to send me his cost of oil and electricity in a PM. It's $3.50 and $0.31, which makes his break-even COP 2.85.

    There's no getting around it, oil is cheaper, there's no economic sense in going to a heat pump.

    So what's going to happen in coming years as we decarbonize our energy mix? I expect that electricity will get cheaper and oil will get more expensive, so the calculus may change. But as a steam heating plant in an historic house, it would be a tough conversion. More likely it will shift to a carbon-neutral form of oil, either plant-based or synthetic made using captured CO2 as the feedstock and off-peak electricity for power.

    That's probably what will happen with aviation fuel as well.

    hot_rod

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