water temp ?

[eagleeyemike]

If my room temp is 85 will this cause my water temp to rise as well. I noticed today that my temp in the tank went up to 81.5 I normally keep it at 78.
120G
4 bulb T5 Lighting

 

[rjrgroup]

Yes. How can it not heat the tank? Ambient temp will eventually overcome the night/cool temp till it reaches the same. Even fans would not help, in fact fans would make it happen sooner.

 

[lilrobb]

rjrgroup;634533 wrote: Even fans would not help, in fact fans would make it happen sooner.

Sorry, but that's not correct!
Fans cool by evaporation, not by difference in temperature...

 

[rjrgroup]

LilRobb;634537 wrote: Sorry, but that's not correct!
Fans cool by evaporation, not by difference in temperature...

So if I take a hair dryer to a glass of water...?

 

[lilrobb]

Theoretically YES,
It will cool - some limits (that are completely neglectable for fishtanks within houses) apply

 

[rjrgroup]

Germans don't believe in theory, do they? Are you starting to become Americanized Rob?

 

[grouper therapy]

Heat will move to the cooler substance.

 

[rjrgroup]

Sorry to have confused you Dave.

grouper therapy;634550 wrote: Heat will move to the cooler substance.

 

[rbredding]

a fan will most definitely help.. but I wouldn't recommend hooking up an electric unit heater to test it..


bottom line.. if the fan is moving air, that air will actually be cooler than the ambient air within the room..


to the original post/question... temperatures ALWAYS want to equalize.. a fish tank at 78* in an 80* will want to heat up..
likewise, the 80* air in the room will want to cool down.. and they both will do so, eventually to the point where they're both at the same temperature.. (somewhere between 80 and 78)

 

[lilrobb]

grouper therapy;634550 wrote: Heat will move to the cooler substance.

For static applications, I absolutely agree - for dynamic, not so much.

The warmer the air is, the more humidity it can carry, so even 100F degree warmer air than water will cool by evaporation faster than the difference in temps can warm it.

Of course a shotglass and a blowtorch are extremes - that do NOT occur in our fishtanks...

 

[grouper therapy]

LilRobb;634566 wrote: For static applications, I absolutely agree - for dynamic, not so much.

The warmer the air is, the more humidity it can carry, so even 100F degree warmer air than water will cool by evaporation faster than the difference in temps can warm it.

Of course a shotglass and a blowtorch are extremes - that do NOT occur in our fishtanks...

I was referring to the ambient temperature of the room transferring to the cooler temp of the tank.
I let you guys battle out the hair styling while doing shots debate.

 

[grouper therapy]

But since you bought it up air does not "hold water" but as it's temperature rises it will transfer heat to the surface of the water thereby vaporizing the water to gaseous state and at the same time allowing that vapor into it's(air) vicinity. The hotter the air and water the more expansion. As this air begins to cool so does the water vapor and condensation takes place . At higher altitudes the air pressure is less and thereby allows more water vapor to occupy some of it's space at the same time cooling the vapor(more heat transfer) and creating clouds.