Zero Knievel Posted February 5, 2022 Share Posted February 5, 2022 Trying to determine how efficient/effective the house windows are. Outside temp 26 F. Indoor air temp 69 F. Inside glass pane 51.9 F. Outside glass pane 34.3 F. From what I know, double pane windows usually have an r-value of 1-2 on average. Quote Link to comment Share on other sites More sharing options...
DBLXX Posted February 5, 2022 Share Posted February 5, 2022 Quote Link to comment Share on other sites More sharing options...
Zero Knievel Posted February 5, 2022 Author Share Posted February 5, 2022 Wrong “r value.” Quote Link to comment Share on other sites More sharing options...
DBLXX Posted February 5, 2022 Share Posted February 5, 2022 Nope, that’s the one. Quote Link to comment Share on other sites More sharing options...
superhawk996 Posted February 5, 2022 Share Posted February 5, 2022 4 hours ago, DBLXX said: Nope, that’s the one. Being that it maxes out at 1 and insulation R value goes way above that, it appears that the R value of your video is about 0. Mike, I don't know if this will answer your question, but it has a better chance: https://en.wikipedia.org/wiki/R-value_(insulation) Quote Link to comment Share on other sites More sharing options...
Zero Knievel Posted February 5, 2022 Author Share Posted February 5, 2022 I know what r-value means, but how does one determine it from just temperature readings…if it’s possible? Most of the math is way over my head. I was hoping there was a calculator that could guesstimate r-value based on inputting the outside and inside surface temp of a material or structure. Quote Link to comment Share on other sites More sharing options...
SwampNut Posted February 5, 2022 Share Posted February 5, 2022 17 minutes ago, Zero Knievel said: I know what r-value means, but how does one determine it from just temperature readings…if it’s possible? Most of the math is way over my head. I was hoping there was a calculator that could guesstimate r-value based on inputting the outside and inside surface temp of a material or structure. Outside of a controlled lab environment, no way to do this reliably. You'd have to factor in all sorts of other things like air movement, and reliably read one square meter. I think our insulation could use improvement for summer heat, so I'll rent/buy a FLIR to scan the whole house. Then put it on the quadcopter to scan the roof. Quote Link to comment Share on other sites More sharing options...
superhawk996 Posted February 6, 2022 Share Posted February 6, 2022 23 hours ago, Zero Knievel said: I know what r-value means, but how does one determine it from just temperature readings…if it’s possible? Most of the math is way over my head. I was hoping there was a calculator that could guesstimate r-value based on inputting the outside and inside surface temp of a material or structure. Beyond what Carlos said, accurately measuring the temp of glass seems impossible to do with household equipment. Quote Link to comment Share on other sites More sharing options...
XXitanium Posted February 7, 2022 Share Posted February 7, 2022 Glass temp?? Tape a generic thermometer to the glass with one of those clear lightweight plastic grocery salad containers. You will get close. https://bim.rockwool.com/rvalue/ U-value is the inverse of r-value. Quote Link to comment Share on other sites More sharing options...
XXitanium Posted February 7, 2022 Share Posted February 7, 2022 ...daylight - solar gain will throw off that value. Quote Link to comment Share on other sites More sharing options...
lordzarkon Posted February 7, 2022 Share Posted February 7, 2022 tape some cardboard on the outside to keep the sun from affecting readings Quote Link to comment Share on other sites More sharing options...
superhawk996 Posted February 7, 2022 Share Posted February 7, 2022 The cardboard will insulate and throw off the reading. Just do it on the shady side of the house or at night. 1 Quote Link to comment Share on other sites More sharing options...
XXitanium Posted February 8, 2022 Share Posted February 8, 2022 ...at night best. The cardboard is a good idea. You could check the difference at night fr fun. ...cardboard just big enough to keep the sun off the plastic container and not insulate the whole window. Really light weight so mass is less of an effect. Quote Link to comment Share on other sites More sharing options...
XXitanium Posted February 8, 2022 Share Posted February 8, 2022 ...by-the-way, we want pictures. Quote Link to comment Share on other sites More sharing options...
SwampNut Posted February 8, 2022 Share Posted February 8, 2022 "I'll take 'how to get random results in science' for $800 Alex!" Quote Link to comment Share on other sites More sharing options...
XXitanium Posted February 9, 2022 Share Posted February 9, 2022 On 2/5/2022 at 5:21 AM, Zero Knievel said: Trying to determine how efficient/effective the house windows are. ...not the whole house. Quote Link to comment Share on other sites More sharing options...
XXitanium Posted February 9, 2022 Share Posted February 9, 2022 On 2/5/2022 at 5:21 AM, Zero Knievel said: Outside temp 26 F. Indoor air temp 69 F. Inside glass pane 51.9 F. Outside glass pane 34.3 F. From what I know, double pane windows usually have an r-value of 1-2 on average. That can be modeled with the right software. Quote Link to comment Share on other sites More sharing options...
XXitanium Posted February 9, 2022 Share Posted February 9, 2022 Oh yeah, measure it in the center of the glass. https://www.allweatherwindows.com/the-pros/architect/glass-performance-chart/ Quote Link to comment Share on other sites More sharing options...
XXitanium Posted February 9, 2022 Share Posted February 9, 2022 ....and if you'd like a more expensive option for testing. https://www.greenteg.com/gO-Measurement/ Quote Link to comment Share on other sites More sharing options...
XXitanium Posted February 9, 2022 Share Posted February 9, 2022 ....nerdier guys than me. https://sustainability.stackexchange.com/questions/358/how-can-i-determine-the-u-value-or-r-value-of-my-existing-double-glazing-syste Quote Link to comment Share on other sites More sharing options...
XXitanium Posted February 13, 2022 Share Posted February 13, 2022 We went with pleated insulating blinds. On 2/5/2022 at 5:21 AM, Zero Knievel said: Outside glass pane 34.3 F. ...how did you "attain" that number please? Quote Link to comment Share on other sites More sharing options...
Zero Knievel Posted February 13, 2022 Author Share Posted February 13, 2022 Took temperature from inside then went out on the porch and took the outside one. Both with one of those laser thermometers. Quote Link to comment Share on other sites More sharing options...
XXitanium Posted March 6, 2022 Share Posted March 6, 2022 On 2/13/2022 at 3:03 PM, Zero Knievel said: ...Both with one of those laser thermometers. https://www.slantfin.com/slantfin-heat-loss-calculator/ https://www.doityourself.com/stry/hot-topics-hot-water-baseboard-heaters Quote Link to comment Share on other sites More sharing options...
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