How much water do high-efficiency furnaces need to drain?
On a typical winter day for those living in cold climates, how much
water (condensation) is produced by a high-efficiency furnace per day? I've heard ranges from barely anything to 5 gallons per day. And would this amount to more or less than what is produced by a central air conditioner? Thanks. |
wrote in message oups.com... On a typical winter day for those living in cold climates, how much water (condensation) is produced by a high-efficiency furnace per day? I've heard ranges from barely anything to 5 gallons per day. And would this amount to more or less than what is produced by a central air conditioner? Thanks. With out humidity numbers anything would be a wild ass guess. |
wrote:
On a typical winter day for those living in cold climates, how much water (condensation) is produced by a high-efficiency furnace per day? You might figure about 5% of the fuel's heating value for oil, ie 0.05x140KBtu/1000 = 7 pounds per gallon, eg 42 lb/day of water, if you burn 6 gal/day of oil, and about twice that for natural gas. And would this amount to more or less than what is produced by a central air conditioner? Depends on the humidity and house air leakage rate. If wi = 0.00787 (80 F at 50% RH) inside and wa = 0.0130 (Phila in July) and a 2400 ft^2 house leaks 224 cfm (a 0.7 ACH average), the AC needs to remove at least 24hx60x224x0.075(wa-wi) = 124 pounds of water per day. Nick |
wrote in message oups.com... On a typical winter day for those living in cold climates, how much water (condensation) is produced by a high-efficiency furnace per day? I've heard ranges from barely anything to 5 gallons per day. And would this amount to more or less than what is produced by a central air conditioner? This from personal recollections. I would guess about a quart per day. Ours discharged over the driveway and I never saw a ice stalagmite over a foot tall after several below freezing days in a row. The AC output will vary greatly with humidity but something around 5 gallons per day would be realistic here and now.:) Colbyt |
Colbyt wrote: wrote in message oups.com... On a typical winter day for those living in cold climates, how much water (condensation) is produced by a high-efficiency furnace per day? I've heard ranges from barely anything to 5 gallons per day. And would this amount to more or less than what is produced by a central air conditioner? This from personal recollections. I would guess about a quart per day. Ours discharged over the driveway and I never saw a ice stalagmite over a foot tall after several below freezing days in a row. The AC output will vary greatly with humidity but something around 5 gallons per day would be realistic here and now.:) Colbyt Thanks for the input. Have you noticed any discoloration of your driveway? I've read that the water run-off from condensation of a gas furnace is acidic, with a pH roughly the same as orange juice. |
wrote in message ups.com... Thanks for the input. Have you noticed any discoloration of your driveway? I've read that the water run-off from condensation of a gas furnace is acidic, with a pH roughly the same as orange juice. We sold that house about 10 years ago. During the 8 or so years that I saw it drip there I did not see any. It was a blacktop drive. YMMV on concrete because of the chemistry involved. Colbyt |
"Colbyt" wrote in message news:embKe.237526$_o.224405@attbi_s71... wrote in message oups.com... On a typical winter day for those living in cold climates, how much water (condensation) is produced by a high-efficiency furnace per day? I've heard ranges from barely anything to 5 gallons per day. And would this amount to more or less than what is produced by a central air conditioner? This from personal recollections. I would guess about a quart per day. Ours discharged over the driveway and I never saw a ice stalagmite over a foot tall after several below freezing days in a row. The AC output will vary greatly with humidity but something around 5 gallons per day would be realistic here and now.:) I've never measured it, but one customer with a 5 ton system says he gets about a gallon per hour of run time for his system. This is in 'normal' weather, nit high humidity conditions.... |
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