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Thread: heating, degrees per hour

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    heating, degrees per hour

    So heated her up today, to 86. Turns out water temp rose from 72 to 86 at about 1 degree every two hours. Ambient temp here on Whidbey today in the 70s and sunny. Is 1degree/2hours fine, medium, poor?
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    Re: heating, degrees per hour

    Quote Originally Posted by engrav
    So heated her up today, to 86. Turns out water temp rose from 72 to 86 at about 1 degree every two hours. Ambient temp here on Whidbey today in the 70s and sunny. Is 1degree/2hours fine, medium, poor?
    and have no solar cover, but just read about them
    still is the rate fine, medium, poor?
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    TFP Guide

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    Re: heating, degrees per hour

    I will assume that Maxi-flo is a 260,000 BTU heater based on the model number. With the weight of water at 8.34 Lbs/gal and a 30,000 gal pool there is roughly 250,000 lbs of water to heat. Under ideal conditions you could see up to a 1 deg/hr rise. However, the 260,000 BTU is the input rating and most older heaters run around 70%-80% efficiency so that put the output just under 210,000BTU. Still not bad but now puts the temp rise at .83 deg/hr. Without a cover to help with heat loss I can see how you will be around 1 deg/2 hr. Something to keep in mind here. If you had, say, a 520,000 BTU heater and conditions the same, the pool would have heated to the same temp in half the time but, with the same fuel usage. Again, this is not taking into consideration all the extra factors such as wind, humidity, ambient air temp etc. which all affect the ability for a heater to heat and a pool to retain heat
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    BoDarville's Avatar
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    Re: heating, degrees per hour

    engrav:

    Here's a heating spreadsheet you might want to play around with: Natural Gas Heating Time & Cost Calculator Spreadsheet.

    As danpik stated, the actual net output of a gas heater is the actual BTU's that go towards heating the pool. The net BTU output is less than the labeled (gross) BTU. It will always take a certain amount of BTU's to heat water to a given temperature, given the ambient conditions. A larger heater will simply do the job faster.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
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    Re: heating, degrees per hour

    thank you both/all
    so 1degree/2hrs is say "par"
    turns out I burned 1.5" of oil yesterday which is about 12 gallons or about $20 but
    4 hrs of that was heating up and all of that included domestic hot water so this is not the bill for simply maintaining pool temp at 86; today is on maintenance at 86 and domestic hot water, should be less than $20, will measure again tomorrow
    but say the cost of maintenance and hot water is $20 and I put on a solar cover at night
    and say it is about 60 degrees at night and 75 daytime, no wind etc
    how much can I expect the maintenance heating bill to decrease? 10% 25% 50%
    with such estimate could estimate how long it would take to recover the cost of the solar cover
    energy.gov says savings of 50-70% are possible, true?
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    JasonLion's Avatar
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    Re: heating, degrees per hour

    Solar covers will save you a dramatic amount of your heating bill, and will pay for themselves every couple of weeks. Of course they are something of a project to put on and take off.

    The rate of heat loss, and thus the cost to maintain temperature depends on several things: how many degrees above the normal temperature you maintain the pool, how long the cover is on (if any), and how much wind you have, etc, so is difficult to predict.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: heating, degrees per hour

    From my personal experience, I'll estimate my cover prevents at least 1/2 of the overnight loss.
    Aaron
    [ Vogue Vectra 24' AG | Hard plumb: Hayward Power-Flo Matrix 1HP 2-speed, 27" sand filter & Pentair MiniMax 100 NG | Taylor K-2006 | Central IL ]
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    Re: heating, degrees per hour

    Quote Originally Posted by Speedo
    From my personal experience, I'll estimate my cover prevents at least 1/2 of the overnight loss.
    ok
    yesterday set to 85 degrees ran pump heater 24/7, was cloudy no wind
    burned 6 gal oil @ $3.71 per, so $22; say 3/4 of it was pool, 1/4 domestic hot water
    then consumed $17 heating pool
    say cover would reduce by 1/2, then would save $8.50 / day.
    say cover is $200 dollars, then would recover cost in 24 heated days
    say covers wear out in 3 years, would need 8 heated days per year
    might be Ok investment save for pain of on/off
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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