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IowaNate
Member
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Posted: Mon Nov 26th, 2007 07:13 pm |
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I am currently recording the temperature of the rear chamber of my three chamber house mounted on my home. This bat house is located 2.5 feet from my occupied house with 9 big browns in it. They are identical height, width, distance above the ground, and both face the same direction (North). I have one sensor placed at the top of the chamber and one sensor placed an inch below the bat house. Since this house and my occupied house face North, they are mostly shaded this time of the year. Most of the house temperature gain is from the air temp and heat coming through my wall and being transferred into the bat house.
The purpose of this study is to see what temperature my big browns are currently "hibernating" at, without disturbing them but matching every constant of the occupied house.
The thermometers are Acurite 00887 digital thermometers with ten foot remote sensors. I made sure they read the same temperature before placing them in position.
I will take readings every hour starting at 2 pm today and update this topic with my findings.
2:00 pm - 42.1 outdoor 44.6 bat house
3:00 pm - 43.0 outdoor 42.3 bat house
4:00 pm - 40.3 outdoor 40.8 bat house
5:00 pm - 37.0 outdoor 39.0 bat house
6:00 pm - 35.4 outdoor 36.9 bat house
7:00 pm - 33.8 outdoor 35.4 bat house
8:00 pm - 31.5 outdoor 34.0 bat house
9:00 pm - 30.2 outdoor 32.7 bat house
10:00 pm to 6:00 am - no temps taken
7:00 am - 24.4 outdoor 28.0 bat house
8:00 am - 22.5 outdoor 25.0 bat house
9:00 am - 23.0 outdoor 23.5 bat house
10:00 am - 25.0 outdoor 24.4 bat house
11:00 am - 26.8 outdoor 26.2 bat house
12:00 am - 29.1 outdoor 28.2 bat house
1:00 pm - 31.1 outdoor 30.4 bat house
2:00 pm - 31.3 outdoor 31.6 bat house
3:00 pm - 30.4 outdoor 33.3 bat house
4:00 pm - 28.8 outdoor 33.1 bat house
5:00 pm - 27.3 outdoor 31.3 bat house
6:00 pm - 25.7 outdoor 29.7 bat house
7:00 pm - 25.0 outdoor 28.0 bat house
The data is much easier to understand on my graph below. Horizontal indicates time, vertical indicates temperature. Red is the bat house temp and black is the ambient air temp. This is from 7 am to 7 pm, November 27 2007.
Last edited on Wed Nov 28th, 2007 12:45 am by IowaNate
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Terry Lobdell
Member
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Posted: Tue Nov 27th, 2007 05:13 am |
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| Interesting.........where did you find the thermometers and sensors?
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IowaNate
Member
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Posted: Tue Nov 27th, 2007 12:15 pm |
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Terry, I got these thermometers at Lowes* in the gardening section. The sensors are about 3/4" long and 1/2" wide and deep, attached to the display unit by a thin ten foot wire. I tested them against two mercury thermometers that I already had, and they read within 1 degree of them. I just wish they logged the temp every hour so there wasn't a data gap while I was sleeping!
I will keep up with the study today.
Last edited on Tue Nov 27th, 2007 12:32 pm by IowaNate
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Terry Lobdell
Member
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Posted: Wed Nov 28th, 2007 01:07 am |
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| Nate, thanks for sharing this info.........I've often thought about building a bat house recessed into a wall of my house that might maintain temps suitable for hibernating bats......your temperature plot and info on equipment will be very helpful for future projects!
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IowaNate
Member
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Posted: Wed Nov 28th, 2007 01:15 am |
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| I hope this info helps you, me, and many others to perhaps keep a few species of bats year-round. I suspect that the temperature is a bit higher in the occupied crevice of the other bat house due to the bat's body temperature and them being so tightly packed together. But this data from the other house being almost 100% identical in every way and only mounted 2.5 feet from the occupied house should show one aspect of thier choices for hibernation temps.
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