water evaporation rate question

Daddyrawg · 08/04/2020, 01:46 PM

does it water evap more if you have a larger tank or is it the same regardless of water volume?

im going from a 90 to a 180 and wondering if I will have to consider more rodi
water when topping off due to evap or is it the same?

djryan2000 · 08/04/2020, 01:49 PM

Quote:

Originally Posted by Daddyrawg

does it water evap more if you have a larger tank or is it the same regardless of water volume?

im going from a 90 to a 180 and wondering if I will have to consider more rodi
water when topping off due to evap or is it the same?

More water will evaporate with the larger tank volume.

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Daddyrawg · 08/04/2020, 01:53 PM

Quote:

Originally Posted by djryan2000

More water will evaporate with the larger tank volume.

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CRAP lol

gtp0083 · 08/04/2020, 02:33 PM

Surface area is your issue. More surface area more evaporation. Less surface area less evaporation.

So if the tank is twice the volume but the exposed surface is the same size evaporation shouldn’t change much.

If your tank is twice the volume and twice the exposed surface area you should expect twice the evaporation.

That’s my understanding anyways.

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Sk8r · 08/04/2020, 03:18 PM

Depends on the tank. I evap a gallon a day from a 50 gallon with open side vents and no glass, with 30 gallon sump exposure. I evap about the same from a 100 gallon with a glass top and same sump exposure.

djryan2000 · 08/04/2020, 03:20 PM

Quote:

Originally Posted by gtp0083

Surface area is your issue. More surface area more evaporation. Less surface area less evaporation.

So if the tank is twice the volume but the exposed surface is the same size evaporation shouldn’t change much.

If your tank is twice the volume and twice the exposed surface area you should expect twice the evaporation.

That’s my understanding anyways.

Sent from my iPhone using Tapatalk

Spot on.

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Timfish · 08/08/2020, 08:37 AM

Seasons play a role too. I often see as much or more evapration in winter as in summer and it can vary a surprising amount week to week as cold or warm fronts pass by.

Tastee · 08/09/2020, 01:12 AM

Air conditioning also plays a role. If you run reverse cycle air conditioners like we do then they produce very dry air, which will increase tank evaporation a little. As previously said however the biggest factor is surface area, both of the DT and also to a lesser degree the sump (as the air in the enclosed sump will stay more moist and reduce evaporation).

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Frost_Hydra · 08/12/2020, 01:14 PM

Having a tank with/without a lid also plays a significant role in keep in evaporation/condensation. When I remove my lid i feel a short burst of humidity, so I know for sure it helps keep water in to some degree.

Dave_Buffalo · 01/23/2021, 02:01 PM

I just recently covered my sump with a towel, and it has reduced my evaporation by half.

Quote:

Originally Posted by Sk8r

I evap a gallon a day from a 50 gallon with open side vents and no glass, with 30 gallon sump exposure.

Imaexpat2 · 01/23/2021, 08:56 PM

Quote:

Originally Posted by gtp0083

Surface area is your issue. More surface area more evaporation. Less surface area less evaporation.

So if the tank is twice the volume but the exposed surface is the same size evaporation shouldn’t change much.

If your tank is twice the volume and twice the exposed surface area you should expect twice the evaporation.

That’s my understanding anyways.

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Thats a big factor but its not the only one. If your running a sump or worse yet a trickle filter(are these even still being used?) where running water is exposed to air, your arte of evaporation will increase significantly.

gtp0083 · 01/23/2021, 10:29 PM

Yup more surface area. ; )

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lowtek · 01/27/2021, 06:12 AM

I have a 60x32x22 180 gal. by rough measurement. I have to refill my ATO once every 7 days. If that gives you a ball park idea of what you might deal with.

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lowtek · 01/27/2021, 06:13 AM

Forgot to mention my ATO is 10 gallons

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08/04/2020, 01:46 PM	#1
Daddyrawg Registered Member Join Date: May 2018 Posts: 814	water evaporation rate question does it water evap more if you have a larger tank or is it the same regardless of water volume? im going from a 90 to a 180 and wondering if I will have to consider more rodi water when topping off due to evap or is it the same?

08/04/2020, 03:18 PM	#5
Sk8r RC Mod Join Date: Feb 2006 Location: Spokane WA Posts: 34,628 Blog Entries: 55	Depends on the tank. I evap a gallon a day from a 50 gallon with open side vents and no glass, with 30 gallon sump exposure. I evap about the same from a 100 gallon with a glass top and same sump exposure. __________________ Sk8r Salinity 1.024-6; alkalinity 8.3-9.3 on KH scale; calcium 420; magnesium 1300, temp 78-80, nitrate .2. Ammonia 0. No filters: lps tank. Alk and cal won't rise if mg is low. Current Tank Info: 105g AquaVim wedge, yellow tang, sailfin blenny,royal gramma, ocellaris clown pair, yellow watchman, 100 microceriths, 25 tiny hermits, a 4" conch, 1" nassarius, recovering from 2 year hiatus with daily water change of 10%.

08/08/2020, 08:37 AM	#7
Timfish Registered Member Join Date: Jul 2010 Location: Austin, TX Posts: 1,985	Seasons play a role too. I often see as much or more evapration in winter as in summer and it can vary a surprising amount week to week as cold or warm fronts pass by. __________________ "Our crystal clear aquaria come nowhere close to the nutrient loads that swirl around natural reefs" Charles Delbeek

08/04/2020, 02:33 PM	#4
gtp0083 Registered Member Join Date: Apr 2007 Location: waddell, AZ Posts: 255	Surface area is your issue. More surface area more evaporation. Less surface area less evaporation. So if the tank is twice the volume but the exposed surface is the same size evaporation shouldn’t change much. If your tank is twice the volume and twice the exposed surface area you should expect twice the evaporation. That’s my understanding anyways. Sent from my iPhone using Tapatalk

08/09/2020, 01:12 AM	#8
Tastee Registered Member Join Date: Oct 2017 Location: Sydney Australia Posts: 277	Air conditioning also plays a role. If you run reverse cycle air conditioners like we do then they produce very dry air, which will increase tank evaporation a little. As previously said however the biggest factor is surface area, both of the DT and also to a lesser degree the sump (as the air in the enclosed sump will stay more moist and reduce evaporation). Sent from my iPad using Tapatalk

08/12/2020, 01:14 PM	#9
Frost_Hydra Registered Member Join Date: Sep 2017 Location: San Francisco, CA Posts: 151	Having a tank with/without a lid also plays a significant role in keep in evaporation/condensation. When I remove my lid i feel a short burst of humidity, so I know for sure it helps keep water in to some degree.

01/23/2021, 10:29 PM	#12
gtp0083 Registered Member Join Date: Apr 2007 Location: waddell, AZ Posts: 255	Yup more surface area. ; ) Sent from my iPhone using Tapatalk

01/27/2021, 06:12 AM	#13
lowtek Registered Member Join Date: Apr 2015 Location: Pacific Northwest Posts: 111	I have a 60x32x22 180 gal. by rough measurement. I have to refill my ATO once every 7 days. If that gives you a ball park idea of what you might deal with. Sent from my SM-G935P using Tapatalk

01/27/2021, 06:13 AM	#14
lowtek Registered Member Join Date: Apr 2015 Location: Pacific Northwest Posts: 111	Forgot to mention my ATO is 10 gallons Sent from my SM-G935P using Tapatalk