Jimbo662 Posted September 26, 2012 Share Posted September 26, 2012 What kind of evaporation should I be seeing on average with a 175g tank that doesn't have a hood? It seems like my auto topoff container is missing 2-3 gal every day. I do leave the ceiling fan going all the time in the room. Quote Link to comment Share on other sites More sharing options...
subsea Posted September 27, 2012 Share Posted September 27, 2012 You can answer that question better than anyone. You have maximized evaporation with ceiling fan and open top tank. I can only assume that you are having a temperature issue and wish to increase evaporative cooling. Is it working for you? What is yout tank water temperature and what is your room temperature? As an engineer, for every pound of water evaporated there is 1000 BTU of cooling. At 8.4 lbs per gallon times 1000 BTU, that means each gallon evaporated cools tank down by 8400 BTU. Quote Link to comment Share on other sites More sharing options...
Bannerfish Posted September 27, 2012 Share Posted September 27, 2012 My 145gal system easily goes through 10gal of top off water a week Quote Link to comment Share on other sites More sharing options...
Jimbo662 Posted September 27, 2012 Author Share Posted September 27, 2012 my thermostat is set for 80 degrees during the day. The tank temp stays around 78-79. I guess I'm right on track based on your experience Banner. Quote Link to comment Share on other sites More sharing options...
Bannerfish Posted September 27, 2012 Share Posted September 27, 2012 Your house is warm compared to mine, I keep my ac at 72, can't stand a hot house lol. I don't use a skimmer, so none of that evaporation is from skimming. I do have allot of water to air contact area though. Quote Link to comment Share on other sites More sharing options...
Jimbo662 Posted September 27, 2012 Author Share Posted September 27, 2012 my tank is just being set up so teh skimmer isn't even in it yet. i'm using a 110g tank for my sump...it's got about 50-60g in it. Quote Link to comment Share on other sites More sharing options...
dshel1217 Posted September 28, 2012 Share Posted September 28, 2012 That seem like a normal rate to me. My 75 is open top with a ac vent above it and I lose about 5 even 3ish days plus I keep the house at 77 when I'm not home Quote Link to comment Share on other sites More sharing options...
Bpb Posted September 28, 2012 Share Posted September 28, 2012 I don't use an ato, but with my 55 gallon open top with another 20 open top gallons in sump and refugium I lose about one a gallon a day. I do my best to minimize splashing of any kind though. All return and drain lines enter below water level. The only splashing sound comes from the water entering the overflow. Tank temp is 80 degrees, house temp is 75. I run a ceiling fan on occasion. Quote Link to comment Share on other sites More sharing options...
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