NANOG: Are there any one the list that would care to take a look at some graphs of temperature, relative humidity and dew point that I have for two locations. In one of the two locations, I'm having a problem with the floor getting wet (condensation?). At the other everything is just fine. I need to understand what these graphs are telling me about the problem and if a simple dehumidifier would solve my moisture problem. Any takers? Oh, the environmental monitor I installed in each location is the IT Watchdog from Geist Global. I bought the POE version. Installed like a charm and was $229 plus shipping. I do wonder if this question is off topic, but then I can hear myself saying "Hey, I'm Operating a Network, here! In North America!" And then I think, "Yep, on topic!" Thanks, Sincerely, Lorell Hathcock SolStar Network, LLC Communications FIBER - VOIP - SECURITY - TV FTTH - Commercial - Residential Burglar - Access Control 956-478-5955 (cell) - 956-316-4090 (main) <mailto:lorell@SolStarNetwork.com> lorell@SolStarNetwork.com <http://www.solstarnetwork.com/> www.SolStarNetwork.com TX License #B19998
On Tue, 10 Nov 2015 16:48:04 -0600, "Lorell Hathcock" said:
Are there any one the list that would care to take a look at some graphs of temperature, relative humidity and dew point that I have for two locations. In one of the two locations, I'm having a problem with the floor getting wet (condensation?). At the other everything is just fine.
Is your moisture problem on a ground floor? Note that even well-cured concrete is like 30% water, and can allow moisture to slowly migrate through and weep. Usual cure is application of a proper sealant over the concrete.
It is on the ground floor, but it is in a hut that has a wood floor that is raised off the ground. There is a gap between the bottom of the floor and the ground. -----Original Message----- From: Valdis.Kletnieks@vt.edu [mailto:Valdis.Kletnieks@vt.edu] Sent: Tuesday, November 10, 2015 5:13 PM To: Lorell Hathcock <lorell@hathcock.org> Cc: 'NANOG list' <nanog@nanog.org> Subject: Re: Environmental Graph Interpretation On Tue, 10 Nov 2015 16:48:04 -0600, "Lorell Hathcock" said:
Are there any one the list that would care to take a look at some graphs of temperature, relative humidity and dew point that I have for two locations. In one of the two locations, I'm having a problem with the floor getting wet (condensation?). At the other everything is just fine.
Is your moisture problem on a ground floor? Note that even well-cured concrete is like 30% water, and can allow moisture to slowly migrate through and weep. Usual cure is application of a proper sealant over the concrete.
My guess is that your floor is not insulated. The air temperature in the room is higher than a temperature of the floor, hence, the floor starts sweating. Where are your temperature sensors installed? Do you have one of them measuring the air temperature in the room and the other located on the floor? What readings they show? I'd use a temp. gun to measure the floor temp (if you have only one sensor installed). and see if you have a considerable temp. difference between those two readings. I'd say you won't have this problem if you insulate the floor (if possible). Another option is A/C - it will help to control the temp and decrease humidity. A dehumidifier should help too but it wouldn't be my choice... On Tue, Nov 10, 2015 at 10:48 PM, Lorell Hathcock <lorell@hathcock.org> wrote:
NANOG:
Are there any one the list that would care to take a look at some graphs of temperature, relative humidity and dew point that I have for two locations. In one of the two locations, I'm having a problem with the floor getting wet (condensation?). At the other everything is just fine.
I need to understand what these graphs are telling me about the problem and if a simple dehumidifier would solve my moisture problem.
Any takers?
Oh, the environmental monitor I installed in each location is the IT Watchdog from Geist Global. I bought the POE version. Installed like a charm and was $229 plus shipping.
I do wonder if this question is off topic, but then I can hear myself saying "Hey, I'm Operating a Network, here! In North America!" And then I think, "Yep, on topic!"
Thanks,
Sincerely,
Lorell Hathcock
SolStar Network, LLC
Communications
FIBER - VOIP - SECURITY - TV
FTTH - Commercial - Residential
Burglar - Access Control
956-478-5955 (cell) - 956-316-4090 (main)
<mailto:lorell@SolStarNetwork.com> lorell@SolStarNetwork.com
<http://www.solstarnetwork.com/> www.SolStarNetwork.com
TX License #B19998
If there are heat producing devices in the room, it sounds implausible for condensation to occur in significant amounts unless the climate is very, very humid. RH sensors are often very inaccurate, but you can get the indoor dew point from the RH and the temperature[1], and if the floor is warmer than the dew point there can be no condensation. If it is below the dew point, there will be condensation - but the outside air cannot be colder than its own dewpoint, so in this case something must be adding water vapor to increase the absolute humidity in the room, or the floor must be cooled by something other than outside air. (Or the temperature [and dew point] of the outside air must be constantly falling while the indoor air is lagging behind. This can only be a transient situation, and the reverse should happen at some point, drying the floor again) 1: http://andrew.rsmas.miami.edu/bmcnoldy/Humidity.html
participants (4)
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Jussi Peltola -
Lorell Hathcock -
Marcin Wojcik -
Valdis.Kletnieks＠vt.edu