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What's an "Average Correction Factor"?

Tremolux Member Posts: 28
We researched Jaga low temperature ( and low water ) radiators, advertised to operate at 104 degrees, with the ability to use higher temperatures.

There's a series of charts labeled "Average Correction Factors" and "Mean Temperatures By 1 GPM - Reference: 160°F (71°C)"

Link: <a href="http://www.jaga-usa.com/downloads/Energy_Savers_technical_information.pdf">http://www.jaga-usa.com/downloads/Energy_Savers_technical_information.pdf</a>

Since the hot water source we're considering ( gas absorption geo-thermal ) produces 140 degree water, the numbers just look confusing. What's to be gained going from 104 to140, or to 160? Does it make a significant difference? What's getting "corrected"?

If a heat pump system is rated at 132K BTU/Hr, is that the upper limit of the heat that it can deliver no matter what the water temperature, or the size, number, or design of the radiators used?


  • NRT_Rob
    NRT_Rob Member Posts: 1,013

    those numbers correct the output rating of the radiator for a different mean water temperature across the radiator.

    I'm not sure why they specify 1 GPM... that's not relevant if they are looking at mean water temp. But their standard assumption seems to be 160 mean, so, 170 in and 150 out, for example. If you sent it 140 and take back 130, for example, you'd have a mean of 135. multiply the radiator output by a correction factor and that's how much heat you'll get from that radiator.

    Low water temps result in bigger radiators and typically higher efficiencies.

    you are limited by heat source output and emitter capabilities when it comes to heat delivery. and I imagine your heat pump would be happier with lower water temps than 140, even if it is gas absorption.
    Rob Brown
    Designer for Rockport Mechanical
    in beautiful Rockport Maine.
  • CMadatMe
    CMadatMe Member Posts: 3,086

    Here is a chart I use. You basically add the correction factor to your heatloss to size the correct panel rad for the water temp and setpoint you desire at design conditions.

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