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| Home Repair (alt.home.repair) For all homeowners and DIYers with many experienced tradesmen. Solve your toughest home fix-it problems. |
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#1
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Measuring duct efficiency
If the temperature difference between the plenum and a duct is 8F (ie:
Plenum is at 120F duct at register is 112F) can this be translated into duct efficiency? Not that I can do much about it as all my ducts above a finished basement ceiling just curious. |
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#2
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"HL" wrote in message news:5Zfpd.1669$VL6.466@clgrps13... If the temperature difference between the plenum and a duct is 8F (ie: Plenum is at 120F duct at register is 112F) can this be translated into duct efficiency? No. Not that I can do much about it as all my ducts above a finished basement ceiling just curious. |
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#3
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"Steve@carolinabreezehvac" wrote in message ... "HL" wrote in message news:5Zfpd.1669$VL6.466@clgrps13... If the temperature difference between the plenum and a duct is 8F (ie: Plenum is at 120F duct at register is 112F) can this be translated into duct efficiency? No. Why? |
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#4
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"HL" wrote in message news:Xbrpd.3148$VL6.784@clgrps13... "Steve@carolinabreezehvac" wrote in message ... "HL" wrote in message news:5Zfpd.1669$VL6.466@clgrps13... If the temperature difference between the plenum and a duct is 8F (ie: Plenum is at 120F duct at register is 112F) can this be translated into duct efficiency? No. Why? Easy enough....what you ask, as you ask, translates to no. Now, had you said, after a run time of XX minutes, with a duct run of XX feet, with a heat rise of XXX degrees, and a delta of XX with a velocity of XXX FPS can this translate to a duct efficiency...and the answer would have been a possible yes. There is a bit more info that would be needed as well, such as duct construction, age, diameter....... Otherwise,no. 8 degree loss on a run of say.....30 feet or less isnt enough to worry about. Depending on how long the run time was, your delta with be less or greater...so...as you ask...no. |
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#5
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"Steve@carolinabreezehvac" wrote in message ... "HL" wrote in message news:Xbrpd.3148$VL6.784@clgrps13... "Steve@carolinabreezehvac" wrote in message ... "HL" wrote in message news:5Zfpd.1669$VL6.466@clgrps13... If the temperature difference between the plenum and a duct is 8F (ie: Plenum is at 120F duct at register is 112F) can this be translated into duct efficiency? No. Why? Easy enough....what you ask, as you ask, translates to no. Now, had you said, after a run time of XX minutes, with a duct run of XX feet, with a heat rise of XXX degrees, and a delta of XX with a velocity of XXX FPS can this translate to a duct efficiency...and the answer would have been a possible yes. There is a bit more info that would be needed as well, such as duct construction, age, diameter....... Otherwise,no. 8 degree loss on a run of say.....30 feet or less isnt enough to worry about. That's really what I needed to know. Depending on how long the run time was, your delta with be less or greater...so...as you ask...no. Thanks, the run is about 30 feet, duct size is 8x14, run time was about 5 mins. |
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#6
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"HL" wrote in message news:gdvpd.2205$cE3.1333@clgrps12... "Steve@carolinabreezehvac" wrote in message ... "HL" wrote in message news:Xbrpd.3148$VL6.784@clgrps13... "Steve@carolinabreezehvac" wrote in message ... "HL" wrote in message news:5Zfpd.1669$VL6.466@clgrps13... If the temperature difference between the plenum and a duct is 8F (ie: Plenum is at 120F duct at register is 112F) can this be translated into duct efficiency? No. Why? Easy enough....what you ask, as you ask, translates to no. Now, had you said, after a run time of XX minutes, with a duct run of XX feet, with a heat rise of XXX degrees, and a delta of XX with a velocity of XXX FPS can this translate to a duct efficiency...and the answer would have been a possible yes. There is a bit more info that would be needed as well, such as duct construction, age, diameter....... Otherwise,no. 8 degree loss on a run of say.....30 feet or less isnt enough to worry about. That's really what I needed to know. Depending on how long the run time was, your delta with be less or greater...so...as you ask...no. Thanks, the run is about 30 feet, duct size is 8x14, run time was about 5 mins. Not really long enough to heat the duct to plen temp,but not a bad drop. If the duct is not insulated, insulate it to R6 per code, and things get better. |
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