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River Tank Temperature Data.

Posted By: Martin Thoene <gkadar@sympatico.ca>
Date: Monday, 8 August 2005, at 8:18 p.m.

Right, I'm pulling the continuation of this thread back up the Forum, so it doesn't drop off too quickly. I found out some interesting stuff today.

First, I'll set the scene. My River-Tank is a 65 gallon. That's 4 feet long X 19" deep x 18" wide.
It's lit by two double tube shop-light units bolted together, so 4 x 4 foot tubes. There are no cover glasses and there's large gaps either side of the lights for ventilation.

THe outside air temp today was around 86.0F, the A/C is on in the apartment, but the balcony door is open with a light, warm breeze coming in. On the ceiling above the tank, and about 4 feet in front of it, there's a ceiling fan, so there's a breeze blowing over the front of the tank.

The River-Tank manifold is powered by 2 x Aquaclear 802 powerheads. Hanging on the back there's an Aquaclear 300 and an Aquaclear 150. Additionally, the tank is filtered by a Fluval 203 cannister and an Eheim 2213 Classic.

Using one of three Coralife external digital thermometers that have the remote probe, I took some temperature readings. I used the same thermometer for all these readings.

The probe allowed me to get temperature readings right in the inlet and outflows from some of these units.

On the Fluval 203, the inlet temp was 80.7F and the outlet was 80.9F.

I didn't check the Eheim, because it has a spraybar return and I couldn't get what I felt would be a meaningful reading because not enough water is around the probe.

On both 802's, the outlet temp was again 80.9F, so both these powerheads and the Fluval are each adding 0.2 degrees to the water temperature. Interesting that the 802's are doing this just within their impeller chambers. You also have to consider that there's heat radiating into the water from the body of the pump.

With the Aquaclear 300, I had 80.7F going in, but 80.6F coming out, so these filters actually slightly cool the water. I think this may be a by-product of their main motor body being external to the filter chamber and the box open to the air could lose some heat. Also, the thin film of water running back into the tank over the weir probably causes some evapourative cooling effect.

In the post in the thread below, I stated that I was using 3 different identical digital thermometers. I did this because every one read differently, so I didn't exactly trust them. I figure 3 sets of readings might be more meaningful.

So they're labelled A, B and C.
First figure is water temp, second is air temp.

Time

09:00..........A 78.2......B 77.3......C 76.2
09:00..........A 69.6......B 69.5......C 65.5
Lights on @ 09:45
12:30..........A 79.4......B 78.0......C 77.5
12:30..........A 69.7......B 70.4......C 66.7

13:00..........A 79.1......B 78.3......C 78.3
13:00..........A 71.4......B 73.2......C 68.5

14:00..........A 79.9......B 78.4......C 78.1
14:00..........A 74.5......B 71.8......C 67.7

14:15..........A 80.4......B 78.9......C 78.5
14:15..........A 71.3......B 69.3......C 66.4

15:00..........A 80.1......B 78.3......C 78.2
15:00..........A 75.4......B 75.0......C 72.4

16:00..........A 80.2......B 79.7......C 78.3
16:00..........A 78.2......B 76.4......C 75.1

16:30..........A 80.9......B 78.3......C 79.1
16:30..........A 78.5......B 78.4......C 76.7

17:00..........A 80.3......B 80.4......C 79.5
17:00..........A 79.5......B 78.4......C 76.1

So, although the temperature readings are all funky, generally there's a gradual increase through the day. If you graph these figures out, there's a general increase, with a few hiccups, but the water temp tends to increase faster than the air temp. I belive this may be related to the radiant heat from the lights.

As I right it's around 20:00, and the water is:

A 80.4......B 77.6........C 76.7

I really don't trust A's reading because at least the other two agree that the water is cooler now and I can tell you that the temp has dropped substantially outside and it feels cooler here in the lounge. The lights are still on over the tank.

So, an interesting 8 hours of data gathering. I'm interested in the warming and cooling effect of the different filters. That wasn't something that I expected to see a difference in.

Martin.
 

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