Hi Tirtha,
How about posting the humidity too? you have posted nearly all the parameters to cool down.
And do post the pic of the monstor[??] fan.
Just let me know if you need any help over making any circuitry to get a balance b/w temp and on/off of your fan.
Well if you dont want dry air, have a air-cooler{water thing? not AC} at home cools both you and tanks
Cheers!
How to measure humidity at home?????
Air cooler will not work, tried that last year. It will lower the temperature of the room a bit but will increase the humidity fast. And evaporation rate will go down.
But 400ltr 20degree water is already cooling down the room temperature a bit.
Let me know if you can guide me on the circuitry (Means if you can manage some time to make one for me. )
Posted: Thu Apr 23, 2009 8:03 pm Post subject: Re: Too Much Cooling :: Need to control
A simple and effective method would be to attach a Common Fan regulator we use at our homes. That way you can control the speed of the fan. If they are DC Fans you can reduce the Current and that way you reduce electicity consumption as well. For 220V fans , Regulators are a good option. I was using that in my marine tank before i swtiched to the 12V DC fans. In which i have used a variable supply so if i want to run the fans slowly i just reduce the current.
Joined: Mar 01, 2008 Posts: 695 Location: kolkata,west bengal
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Posted: Thu Apr 23, 2009 8:03 pm Post subject: Re: Too Much Cooling :: Need to control
@ Tirtha da, I think,as you have a very dry weather so high rate evaporation occurs and this drops down the temp of your tank......but 20 deg c!!!!!!!!! it's a huge drop in temp!!
Joined: Oct 28, 2004 Posts: 2450 Location: Salem, TN
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Posted: Thu Apr 23, 2009 8:09 pm Post subject: Re: Too Much Cooling :: Need to control
1. You have an ambient temp of 40-41 C inside your house? And you dont get dehydrated?
2. If your ambient temp is 40 and without any cooling on an open top tank, a 10 C difference in temp? Without any external cooling, the difference between an open top tank and the ambience is generally not more than 4-5 C.
3. If the fans have brought down the temp to 20 C, even before it reaches half way of that, the ambient temperature will try to cook it up, unless you heat shield atleast 3 sides of your tank. Thats because, your fan will try to cool it only from the top, whereas the ambience will cook it from all 6 directions.
Please check your thermometeres!
And for a solution, if at all you want to have a standard temperature, you can't work on a solution until you measure how much your fans are further gonna cool your water below the ambience. because, the only possibility this could happen is, your ambience goes close to 20 C during nights which again would be a phenomenon in dry tropical summer without rains, and if you had rains, your ambience will no where be close to 40 during day.
One more parameter is, with filters, you will be having even temperature all over the tank. If you had still waters, the fans will make the hotter water which will be on the top to evoporate and leaving the cooler water down. Now with filters running and circulating water, your fans have to take longer than stagnant water to bring out evoporation itself.
Posted: Thu Apr 23, 2009 8:15 pm Post subject: Re: Too Much Cooling :: Need to control
@shameek
I had seen a similar drop in Bappa's tank as well with the fans that i had installed at his place. Even the temperature in his tank dropped drastically. Both tritha and bappa live in similar environments.
1. You have an ambient temp of 40-41 C inside your house? And you dont get dehydrated?
2. If your ambient temp is 40 and without any cooling on an open top tank, a 10 C difference in temp? Without any external cooling, the difference between an open top tank and the ambience is generally not more than 4-5 C.
3. If the fans have brought down the temp to 20 C, even before it reaches half way of that, the ambient temperature will try to cook it up, unless you heat shield atleast 3 sides of your tank. Thats because, your fan will try to cool it only from the top, whereas the ambience will cook it from all 6 directions.
Please check your thermometeres!
And for a solution, if at all you want to have a standard temperature, you can't work on a solution until you measure how much your fans are further gonna cool your water below the ambience. because, the only possibility this could happen is, your ambience goes close to 20 C during nights which again would be a phenomenon in dry tropical summer without rains, and if you had rains, your ambience will no where be close to 40 during day.
One more parameter is, with filters, you will be having even temperature all over the tank. If you had still waters, the fans will make the hotter water which will be on the top to evoporate and leaving the cooler water down. Now with filters running and circulating water, your fans have to take longer than stagnant water to bring out evoporation itself.
Madhu, I know this is really hard to believe but please believe me. It's happening.
As you said, lets assume, the Thermometer is giving me a wrong reading. Lets assume the starting temp is not 30 degree but 28 degree. But the same thermometer is showing me 10 degree drop after 36 hrs. This difference of the temperature drop can't be wrong. And I checked it with 3 different thermometers, and the reading is same. But again, I will check this with another calibrated digital thermometer this weekend.
Ambient Temperature is 40-41, by that I meant out side temperature. But the tank is placed just a feet away from an open window. And you are right. Here you will be dehydrated even before you can feel it. No sweat but scorching heat and dry rough skin with bleeding nose.
And I am running one 2217 and a 700lph driven CO2 reactor in this tank. So guess I have enough circulation.
Take a look at the pictures below.
This is the 8" 65watt Fan.
And here, how I have installed it between my 2 MH. Distance from water surface is 1 feet. See the distance of the tank from the Open window.
Another thing I forgot to specify. Both of my MH are burning 8hrs a day non stop.
@Nash, thanks a lot bro for that regulator idea. But before installing that, this weekend I will spend some hours at Bhangar Shops, to find out a thermostat from a broken AC. Let me see if I can get one.
Thanks for the links Ravi Sir. But these are too costly. Now I can remember, I saw some Chinese table clock which are having All these digital readings. Will find out one, but not sure how accurate those will be.
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you have posted nearly all the parameters to cool down.
cools both you and tanks
)
Now I can remember, I saw some Chinese table clock which are having All these digital readings. Will find out one, but not sure how accurate those will be. 
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