 Posted 10/18/2004 8:04:10 PM
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| I wrote back in 5/21/03 about my Morton Building 40'x40'x13' with 9"wall insulation & 12" ceiling insulation. All metal interior 2-10'x12' overhead doors, this building is air tight. Ave snowfall 100"-130" with ave. temp. 25*-35*. 60,000 btu Reznor closed cumbustion set at 62*. In the winter time it's like a sauna RH is at 72%+. I have snow & ice dripping off the trucks constantly. Ken's response was I need more exhaust ventilation, start with 100 cfm of exhaust operation 24 hours a day. I had that in installed to no avail. I tried cranking the heat up to 72* & cracked the windows still to no avail. I've tried a normal dehumidifier it works fine but it freezes up and doesn't run often enough. I am seriously considering the HI-E Dry 100 due to it's low temp. range. Please help, another winter at those RH levels and my equipment & tools can't take it, not to mention the metal walls!
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Posted 1/2/2007 5:40:40 PM
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I wrote back in 5/21/03 about my Morton Building 40'x40'x13' with 9"wall insulation & 12" ceiling insulation. All metal interior 2-10'x12' overhead doors, this building is air tight. Ave snowfall 100"-130" with ave. temp. 25*-35*. 60,000 btu Reznor closed cumbustion set at 62*. In the winter time it's like a sauna RH is at 72%+. I have snow & ice dripping off the trucks constantly. Ken's response was I need more exhaust ventilation, start with 100 cfm of exhaust operation 24 hours a day. I had that in installed to no avail. I tried cranking the heat up to 72* & cracked the windows still to no avail. I've tried a normal dehumidifier it works fine but it freezes up and doesn't run often enough. I am seriously considering the HI-E Dry 100 due to it's low temp. range. Please help, another winter at those RH levels and my equipment & tools can't take it, not to mention the metal walls![/quote]
Exhausting 100 cfm of 62^F, 75% RH removes 2 lbs. per hour with make-up air of 32^F,80%RH. A Hi-E Dry 100 removes 4 lbs. per hour at 80^F,60%RH. Your target should be <40%RH. Operating a Hi-E Dry 100 62^F, <40%RH is less than 2 lbs. per hour for .8 kwh. The heat generated by this process is 4,700 buts of heat. At this condition our dehumidifiers are at the lower level of dehumidification possible. At $.10 per kwh, Hi-E Dry 100 removes 50 pints for 20 kwh or $2 and generates 110,000 btus of heat. This unit would work well when the outside temperatures are above 50^F.
But during cold outside temperatures , I suggest doulbing or tripling the exhaust ventilation rate when wet inside and cold outside as more a economical method and get below 40%RH. This will require a provision for make-up air inlets like cracked windows. Heating 100 cfm from 32^F to 62^F takes 3,500 btus of heat per hour. Three times the exhaust rate takes 10,500 btus per hour removing 6 lbs. of water per hour. If heating with natural gas at $1.00 per therm and 80% eff., it cost $1.00 to remove 50 pints of water.
6 Lbs/hr. X 24 hours = 144lbs/day using 2.5 therms of Nat. gas per day.
Adding the Hi-E Dry 100 may work when combined with the 100 cfm of ventilation. Its a toss-up. Ken
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