MrSandman
Team RC
RESULT:
13885.2oz of water in temperature 79.40886699507399 F deg
Thankfully I didn't have to pull out my Heat Transfer textbook. [emoji28]
RESULT:
13885.2oz of water in temperature 79.40886699507399 F deg
Thankfully I didn't have to pull out my Heat Transfer textbook. [emoji28]
keepLearning
Active member
MrSandman
Team RC
Yes, if you're talking about volume (fluid ounces). I'm talking about mass (ounces).
Another reason we should move to the metric system.
The English system is too complicated.Just gotta use a+b=c, water blending math.
(1.5gal x 40F) + (100gal x 80F) = (101.5gal x ?)
Answer is 79.4F
m0nkie
Well-known member
what I did was route the RODI line directly into my room. Made these acrylic tanks so it's not too ugly. The RODI splits into 2. 1 to the ATO, 1 to the salt bucket. I make 40 gallons each time.
organism
code monkey
Does specific gravity vary widely with temperature? I wouldn't be worried about that small of a change into a large system as far as a temperature change in the display, but if the salinity is off a bit due to a lower temperature then it'll slowly start throwing off your main system.
slief
RC Sponsor
I have two 100 gallon storage tanks in a shed outside. One for RODI and one for salt water. I don't use heating on the mixing tank let alone RODI tank unless I plan on doing a large water change in which case I have a small heater dangling in the tank that I can turn on via my Apex which is wired to the shed along with additional plumbing to and from the tank through the house wall. Normally I automatically change out 5 gallons a day on a 600-650g total volume system. I evap between 3 and 5 gallons a day on top of that. The ice cold RODI and ice cold water change water doesn't impact my temps at all despite me not using a heater on my tank and my tank being 76-77*. For your volume and 1.5 gallon a day water changes, I don't think you really need to worry at all.
B
bozoreefer
what I did was route the RODI line directly into my room. Made these acrylic tanks so it's not too ugly. The RODI splits into 2. 1 to the ATO, 1 to the salt bucket. I make 40 gallons each time.
dude! that is awesome! How hard was it to make these tanks? Expensive?
Would you be interested in making one for me hahaa.
B
bozoreefer
Bump! Great Question!
B
bozoreefer
Gotcha! Thanks for your input! Much appreciated!
Thats what I expected as well. I'm happy from all the responses. Now I don't have to eat up more energy with heaters, unless I'm doing large water changes.
For those with smaller tanks doing auto water changes, would you also recommend not needing the heaters in the bins?
m0nkie
Well-known member
I wish I can.. lol. some folks can make acrylics, but I'd rather not risk it.. I bought mine from AA. small one is around 100. big one is around 300
MrSandman
Team RC
Specific gravity doesn't change but the accuracy of our measuring devices might. I think hydrometers are calibrated for use at specific temperature ranges. Refractometers have automatic temperature compensation. What you need to make sure of is when you use a refractometer, that you use it under the same conditions that you calibrated it in. If you calibrate it inside when it's 76 degrees and you go outside and use it in 40 degree weather you might see differences at such wide swings. Another recommendation is that when you apply water to the meter that you wait 30 seconds or more to allow it to stabilize. I'm not sure about all of this but I seem to remember an article online about the use of refractometers.
Another thing to think about is the solubility of our salt mixes at low temperatures. Again, no scientific evidence I know of but its better to be safe than sorry if you're adding salt to a large cold vat of water. Perhaps you just need to get it up to temperature to completely dissolve and then you can drop the temperatures back down again afterwards. I don't think the trace elements will precipitate out when temps drop.
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