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Old 10/29/2020, 05:02 PM   #1
dubmaneh
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Odd Temperatures

Hereís an odd one.

System is 70gallon net with a 65gal DT on the main floor and a 40gal sump in the basement furnace room.

Have digital thermometers on a reef keeper - one in the sump to control the system heaters( also in the sump). And one in the DT as a reference.

During the day, when the house thermostat upstairs is set to 70f the display is always 1-2f cooler than the sump.

At night when the thermostat in the house is set to 64f, the temps in the DT and sump are the same.

I canít figure this out. If temps are stable overnight, why the variation during the day?

Any ideas?


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Old 10/30/2020, 08:34 AM   #2
Timfish
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My guess is air flow from the ac is cooling the dispaly tank during the day.


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Old 10/30/2020, 11:18 AM   #3
dubmaneh
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No AC on. This is with heat on in the house.


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Old 10/30/2020, 11:49 AM   #4
ThePurple12
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Are you using the same thermometer? If so, maybe one is more accurate at specific temps than the other?


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Old 10/30/2020, 12:07 PM   #5
dubmaneh
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Different thermometers. Both online on the reef keeper simultaneously. Have calibrated them both and believe them to be accurate.

Even after calibration I get the odd temp swings/variations.

Corals are fine but canít figure out why the discrepancies.


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Old 10/30/2020, 05:44 PM   #6
Vinny Kreyling
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What size heaters? Is one not working & there is not enough heat to get to 70 degrees?


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Old 10/30/2020, 07:06 PM   #7
dubmaneh
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I should clarify. The aquarium system temp is set to 76.5f. During the day when the furnace brings the house to 70f the DT runs about 1 degree under the set point of 76.5 while the sump is about 2 degrees above.

At night when the house is colder(64f) the temps in both the DT and sump even out at 76.5f.

There are three 1500w heaters in the sump.



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Old 10/31/2020, 09:02 AM   #8
Vinny Kreyling
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I'll bet you run an oil fired burner that heats the space the sump is in just because it gets hot when running. Always loved being downstairs in my dad's place in the colder weather.


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Old 10/31/2020, 09:42 AM   #9
Timfish
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Quote:
Originally Posted by dubmaneh View Post
No AC on. This is with heat on in the house.
My mistake, living in central Texas I always think in terms of AC, we don't really have much of a winter.
Evaporative cooling by air flow, even if the air is heated can cool a tank significantly. Warm dry air can hold a significant amount of moisture and the the loss of water through evaporation can have a surprising pronounced cooling effect.


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