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#1
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Window condensation / sweats
I live in less than a year old house with the latest energy efficient
windows. This is my first winter at this house. I see lots of water/moisture around window, top to bottom, where they are literally dripping to floor. I check other postings. I don't see any visible leak (or at least I don't feel it). My wall clock which has humidity level check is telling me it's at 30, so I think that's pretty low. I'm keeping the house at 70 degrees and currently here at North Texas the outside temperature is at above freezing (around 35??). All my windows are like these. What can I do to get rid of this problem? I'm contacting the home builder in mean time. |
#2
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Window condensation / sweats
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#3
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Window condensation / sweats
Is this on one window or all of them?...........how many are sweating? Do you raise or lower the inside temp when you leave the home? Then raise/lower the temp when you again arrive home, etc? Do you also have storm windows on the outside of these windows? Me...live in New England and always have this problem. After shutting storm windows......no more problem. |
#4
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Window condensation / sweats
avid_hiker wrote: Is this on one window or all of them?...........how many are sweating? Do you raise or lower the inside temp when you leave the home? Then raise/lower the temp when you again arrive home, etc? Do you also have storm windows on the outside of these windows? Me...live in New England and always have this problem. After shutting storm windows......no more problem. All my windows are having the same problem, upstairs and downstairs, some more than others. We keep the house at the same temp all day. No such thing as storm windows, just dual layer with tiny gap between (no air, someone told me) and it is slightly tinted blue per new city code for hot summer here in Texas. The frames are aluminum and water is on there, too. I'm gonna try getting reliable humidity meter and then try de-humidifier. I think the reading is wrong, too. I also read that on new house, the new lumber and concrete will generate more moisture than, say old house. I asked my wife to do the followings meanwhile. open blinds for better circulation. circulate air from outside for an hour or so. keep the fans running at "on" instead of "auto". and keep mopping ..... |
#6
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Window condensation / sweats
Joseph Meehan wrote:
Let me add one thing. Sometimes you can have luck by allowing additional air circulation to the windows. Open any curtains or drapes and maybe even use a fan to move the air around. Try that for a couple of hours and see if it helps. -- Joseph Meehan Dia 's Muire duit |
#8
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Window condensation / sweats
wrote in message
oups.com... I live in less than a year old house with the latest energy efficient windows. This is my first winter at this house. I see lots of water/moisture around window, top to bottom, where they are literally dripping to floor. I check other postings. I don't see any visible leak (or at least I don't feel it). My wall clock which has humidity level check is telling me it's at 30, so I think that's pretty low. I'm keeping the house at 70 degrees and currently here at North Texas the outside temperature is at above freezing (around 35??). All my windows are like these. What can I do to get rid of this problem? I'm contacting the home builder in mean time. First, buy a reliable humidity meter. The component in your wall clock is probably malfunctioning. Secondly "the latest energy efficient windows" suggests your new house is probably more airtight than you were formerly used to. Condensation occurs on a surface (e.g. window glass) when it is cooler than the "dew point," the temperature at which dissolved H2O vapor in the air turns to visible liquid water. This can easily happen when it is freezing outside and you have single-pane windows. Double glazing reduces the likelihood of interior condensation but it can still happen, depending on actual temperatures and humidities. You may feel the benefit of a dehumidifier (but not if your actual humidity were truly 30 per cent.) -- Don Phillipson Carlsbad Springs (Ottawa, Canada) |
#9
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Window condensation / sweats
Don Phillipson wrote: wrote in message oups.com... I live in less than a year old house with the latest energy efficient windows. This is my first winter at this house. I see lots of water/moisture around window, top to bottom, where they are literally dripping to floor. I check other postings. I don't see any visible leak (or at least I don't feel it). My wall clock which has humidity level check is telling me it's at 30, so I think that's pretty low. I'm keeping the house at 70 degrees and currently here at North Texas the outside temperature is at above freezing (around 35??). All my windows are like these. What can I do to get rid of this problem? I'm contacting the home builder in mean time. First, buy a reliable humidity meter. The component in your wall clock is probably malfunctioning. Secondly "the latest energy efficient windows" suggests your new house is probably more airtight than you were formerly used to. Condensation occurs on a surface (e.g. window glass) when it is cooler than the "dew point," the temperature at which dissolved H2O vapor in the air turns to visible liquid water. This can easily happen when it is freezing outside and you have single-pane windows. Double glazing reduces the likelihood of interior condensation but it can still happen, depending on actual temperatures and humidity's. You may feel the benefit of a dehumidifier (but not if your actual humidity were truly 30 per cent.) -- Don Phillipson Carlsbad Springs (Ottawa, Canada) We had an almost identical posting string to this recently. In which someone wondered whether to blame the condensation on their new window. Sounds like high humidity in a well sealed house. Ventilate and/or air exchange! |
#10
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Window condensation / sweats
wrote in message oups.com... I live in less than a year old house with the latest energy efficient windows. This is my first winter at this house. I see lots of water/moisture around window, top to bottom, where they are literally dripping to floor. I check other postings. I don't see any visible leak (or at least I don't feel it). My wall clock which has humidity level check is telling me it's at 30, so I think that's pretty low. I'm keeping the house at 70 degrees and currently here at North Texas the outside temperature is at above freezing (around 35??). All my windows are like these. What can I do to get rid of this problem? I'm contacting the home builder in mean time. At 70 degree indoor temp. at 30% RH the window temperature would have to reach 28 degrees or less for the moisture in the air to reach dew point. With a accurate indoor temperature and RH reading you can determine the temperature the glass must reach for moisture to condensate on the glass. If the outdoor temperature dropped suffiently over night water droplets on the glass could occur. You might try if you have a humidifier turning it down, or if several long showers are taken in the home each day, use the venting fan while taking a shower. Also sometimes after boiling something like pasta this will happen no matter what else you do if the home is very tight. If it is constant problem it maybe worth monitoring the RH by purchasing a hygrometer or sling psychrometer. |
#11
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Window condensation / sweats
http://www.mayfairwindow.com/About%20Condensation.html
My home builder just replied back with a PDF to read. I found the exact content in web. |
#12
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Window condensation / sweats
jolt wrote:
At 70 degree indoor temp. at 30% RH the window temperature would have to reach 28 degrees or less for the moisture in the air to reach dew point. No. Tdp = (70+460)/(1-(460+70)ln(0.3)/9621)-460 = 37 F... 20 TI=70'indoor temp (F) 30 TA=35'outdoor temp (F) 40 RIF=.67'R-value of indoor air film 50 FOR RV=1 TO 4'window R-value (ft^2-F-h/Btu) 60 TG=TI-RIF*(TI-TA)/RV'glazing and dew point temp (F) 70 RH=100*EXP(9621/(TI+460)-9621/(TG+460)) 80 PRINT RV,TG,RH 90 NEXT RV Window glazing Max Relative R-value temp (F) Humidity (%) 1 46.55 43.15557 2 58.275 66.32038 3 62.18334 76.20583 4 64.1375 81.62463 Nick |
#13
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Window condensation / sweats
wrote: jolt wrote: At 70 degree indoor temp. at 30% RH the window temperature would have to reach 28 degrees or less for the moisture in the air to reach dew point. No. Tdp = (70+460)/(1-(460+70)ln(0.3)/9621)-460 = 37 F... 20 TI=70'indoor temp (F) 30 TA=35'outdoor temp (F) 40 RIF=.67'R-value of indoor air film 50 FOR RV=1 TO 4'window R-value (ft^2-F-h/Btu) 60 TG=TI-RIF*(TI-TA)/RV'glazing and dew point temp (F) 70 RH=100*EXP(9621/(TI+460)-9621/(TG+460)) 80 PRINT RV,TG,RH 90 NEXT RV Window glazing Max Relative R-value temp (F) Humidity (%) 1 46.55 43.15557 2 58.275 66.32038 3 62.18334 76.20583 4 64.1375 81.62463 Nick I haven't seen code like that since high school. Is that BASIC? |
#14
Posted to alt.home.repair,sci.engr.heat-vent-ac
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Window condensation / sweats
wrote:
wrote: jolt wrote: At 70 degree indoor temp. at 30% RH the window temperature would have to reach 28 degrees or less for the moisture in the air to reach dew point. No. Tdp = (70+460)/(1-(460+70)ln(0.3)/9621)-460 = 37 F... 20 TI=70'indoor temp (F) 30 TA=35'outdoor temp (F) 40 RIF=.67'R-value of indoor air film 50 FOR RV=1 TO 4'window R-value (ft^2-F-h/Btu) 60 TG=TI-RIF*(TI-TA)/RV'glazing and dew point temp (F) 70 RH=100*EXP(9621/(TI+460)-9621/(TG+460)) 80 PRINT RV,TG,RH 90 NEXT RV Window glazing Max Relative R-value temp (F) Humidity (%) 1 46.55 43.15557 2 58.275 66.32038 3 62.18334 76.20583 4 64.1375 81.62463 I haven't seen code like that since high school. Is that BASIC? Yup. Just like the code in the ASHRAE 55-2004 comfort standard :-) Nick |
#15
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Window condensation / sweats
That is a very informative article. Very interesting. I shall keep that in mind for my home also. |
#16
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Window condensation / sweats
was wondering if possibly you had a drippy water pipe somewhere causing
this excess humidity. Do all your neighbors have the same problem? |
#17
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Window condensation / sweats
avid_hiker wrote: That is a very informative article. Very interesting. I shall keep that in mind for my home also. About this energy efficient windows. I have to say that these windows really work during summer. I had 2500 sq ft house just 2 miles south from where I'm at and my electricity bill was about $300 per month. Now with 4000 sq ft house with these windows, I'm still at $300 per month, max !!! My old house was built in 1999. I'm sure other factors helped, like SEER 14 AC (two of them), which I paid extra for. And these blue tint actually looks pretty good. Sorry, off the subject. |
#18
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Window condensation / sweats
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#19
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Window condensation / sweats
wrote in message ... jolt wrote: At 70 degree indoor temp. at 30% RH the window temperature would have to reach 28 degrees or less for the moisture in the air to reach dew point. No. Tdp = (70+460)/(1-(460+70)ln(0.3)/9621)-460 = 37 F... 20 TI=70'indoor temp (F) 30 TA=35'outdoor temp (F) 40 RIF=.67'R-value of indoor air film 50 FOR RV=1 TO 4'window R-value (ft^2-F-h/Btu) 60 TG=TI-RIF*(TI-TA)/RV'glazing and dew point temp (F) 70 RH=100*EXP(9621/(TI+460)-9621/(TG+460)) 80 PRINT RV,TG,RH 90 NEXT RV Window glazing Max Relative R-value temp (F) Humidity (%) 1 46.55 43.15557 2 58.275 66.32038 3 62.18334 76.20583 4 64.1375 81.62463 Nick Your right I should use my reading glasses when I use a Psychometric Chart. At 37 degrees the glass temperature reaching dew point is more likely. Dry bulb wet bulb temps with my background were use to calculate superheat or subcool. |
#21
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Window condensation / sweats
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#22
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Window condensation / sweats
bowgus wrote:
wrote: I live in less than a year old house with the latest energy efficient windows. For the 1st year, there will be excess humidity in the building materials in the new house ... it'll likely calm down about in the 2nd year ... that was my experience. In the meantime, if you don't have power ventilation, you'll have to make do somehow ... crack a window open maybe. In my case, the new house attached to the old house, so I put an opening at the top of the adjoining wall letting that excess humidity go into the dry, leaky old house next door ... an excellent solution :-) I find that true to some extent. Maybe not a year, but in this case the owner has measured humidity at 30%. Of course it may not have been an accurate measure. -- Joseph Meehan Dia 's Muire duit |
#23
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Window condensation / sweats
Joseph Meehan wrote: bowgus wrote: wrote: I live in less than a year old house with the latest energy efficient windows. For the 1st year, there will be excess humidity in the building materials in the new house ... it'll likely calm down about in the 2nd year ... that was my experience. In the meantime, if you don't have power ventilation, you'll have to make do somehow ... crack a window open maybe. In my case, the new house attached to the old house, so I put an opening at the top of the adjoining wall letting that excess humidity go into the dry, leaky old house next door ... an excellent solution :-) I find that true to some extent. Maybe not a year, but in this case the owner has measured humidity at 30%. Of course it may not have been an accurate measure. -- Joseph Meehan Dia 's Muire duit The colder an environment, the more noticable the mositure of new construction. Ventilatiojn schems like an HRV will work overtime the first winter after new construction in a cold climate. The next winter they can over ventilate to the point people want to add humidifiers |
#24
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Window condensation / sweats
Have you spoken to your neighbors as of yet? |
#25
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Window condensation / sweats
avid_hiker wrote: Have you spoken to your neighbors as of yet? Not yet, but the good news is that the problem is gone. Here is what I did. I had my wife circulate the air by opening the back door for fresh air and put the fan "on" instead of "auto". By the time I got back from work, I had to clean up the water but I haven't seen the problem again for last few days. I also got two hygrometers, one analog and one digital, and they had ranged between 35% to 42% at given moment. Even with the wide range I think I was still at near "dry" condition. I believe the main problem was the rapid drop in temperature in addition to new construction in first winter. I took the reading in bathroom when I took a shower and it was at 53% (highest). I ran the bathroom fan for about 30 minutes and it went down to 33%. I think I'm gonna use the fan during shower during winter. Thanks guys. |
#26
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Window condensation / sweats
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#27
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Window condensation / sweats
wrote in message oups.com... I live in less than a year old house with the latest energy efficient windows. This is my first winter at this house. I see lots of water/moisture around window, top to bottom, where they are literally dripping to floor. I check other postings. I don't see any visible leak (or at least I don't feel it). My wall clock which has humidity level check is telling me it's at 30, so I think that's pretty low. Either the windows/frames are having problems, or your hygrometer (clock) is wrong. I'd pick up another hygrometer to just to be sure. |
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