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Electricity/Temperature conversion

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  • richardt2005
    If someone could check my math, I d be thankful If I want to raise 10 gallons of water from 77 degrees F to 167 F (in an insulated container) I think it takes
    Message 1 of 4 , Jun 30, 2006
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      If someone could check my math, I'd be thankful

      If I want to raise 10 gallons of water from 77 degrees F to 167 F (in
      an insulated container) I think it takes 2197 watt hours.

      In metric, 37.85 liters raised 50 C.

      So,
      37850 grams, times 50 calories each, or 1892500 calories, or 7910650
      joules. One joule is a watt second. Divide by 3600 seconds in an
      hour, and I get 2197 watt hours.

      Did I miss somewhere?
    • Paul McMillan
      10 Gal = 37.854 liters 167F - 77F = 90 F = 32.222C Assuming 1atm in your vessel, 1kcal energy raises 1 liter of water 1 degree C so, 37.854 liters * 32.222C *
      Message 2 of 4 , Jul 1, 2006
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        10 Gal = 37.854 liters
        167F - 77F = 90 F = 32.222C

        Assuming 1atm in your vessel,
        1kcal energy raises 1 liter of water 1 degree C so,
        37.854 liters * 32.222C * 1kcal/(1L*1C) = 1219.7kcal
        1 Joule ~ 2.390x10^-4kcal
        1219.7kcal * 1J/2.390x10^-4 = 5,103,300 J
        1 Joule = 1 Watt / second
        1 Joule = (1 Watt / second) * (3600 seconds/ 1 hour)
        5103,300 J * (1 Watt/second) * (3600 seconds/ 1 hour) = 1417.6 Watt/Hours

        Did I screw that up? Not sure where you got your 50C, but that's the
        point at which my calculations diverged.

        Paul



        On 6/30/06, richardt2005 <richardt2005@...> wrote:
        > If someone could check my math, I'd be thankful
        >
        > If I want to raise 10 gallons of water from 77 degrees F to 167 F (in
        > an insulated container) I think it takes 2197 watt hours.
        >
        > In metric, 37.85 liters raised 50 C.
        >
        > So,
        > 37850 grams, times 50 calories each, or 1892500 calories, or 7910650
        > joules. One joule is a watt second. Divide by 3600 seconds in an
        > hour, and I get 2197 watt hours.
        >
        > Did I miss somewhere?
        >
        >
        >
        >
        >
        >
        >
        >
        > New Distillers group archives are at http://archive.nnytech.net/
        > FAQ and other information available at http://homedistiller.org
        >
        >
        > Yahoo! Groups Links
        >
        >
        >
        >
        >
        >
        >
      • richardt2005
        ... OK, I think that s where we diverged. 77F = 25C 167F = 75C 75C-25C = 50C So, for a 20 gallon boiler, which I expect to fill half full of wash, 4kw in
        Message 3 of 4 , Jul 1, 2006
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          --- In new_distillers@yahoogroups.com, "Paul McMillan" <Paul@...>
          wrote:
          >
          > 10 Gal = 37.854 liters
          > 167F - 77F = 90 F = 32.222C

          OK, I think that's where we diverged.

          77F = 25C
          167F = 75C
          75C-25C = 50C

          So, for a 20 gallon boiler, which I expect to fill half full of wash,
          4kw in heating elements to get up to runable temerature (and then
          expet to run at 1 kw) isn't outlandish?
        • Paul McMillan
          Right. the issue is that the subtraction should be done in kelvin, making your 50C number correct. F is such a screwy scale. My bad... Paul
          Message 4 of 4 , Jul 2, 2006
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            Right. the issue is that the subtraction should be done in kelvin,
            making your 50C number correct. F is such a screwy scale. My bad...

            Paul


            On 7/1/06, richardt2005 <richardt2005@...> wrote:
            > --- In new_distillers@yahoogroups.com, "Paul McMillan" <Paul@...>
            > wrote:
            > >
            > > 10 Gal = 37.854 liters
            > > 167F - 77F = 90 F = 32.222C
            >
            > OK, I think that's where we diverged.
            >
            > 77F = 25C
            > 167F = 75C
            > 75C-25C = 50C
            >
            > So, for a 20 gallon boiler, which I expect to fill half full of wash,
            > 4kw in heating elements to get up to runable temerature (and then
            > expet to run at 1 kw) isn't outlandish?
            >
            >
            >
            >
            >
            >
            >
            >
            > New Distillers group archives are at http://archive.nnytech.net/
            > FAQ and other information available at http://homedistiller.org
            >
            >
            > Yahoo! Groups Links
            >
            >
            >
            >
            >
            >
            >
            >
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