Wood stove top fans (heat powered)

[Snobdds]

A stove produces HEAT Period! Produced as elevated temperatures on the exterior panels of the stove.

How that heat is transported away from the stove surface is a variable.

It could be by radiation. (Deadly Infra Red "Heat Rays ;-)

It could be by Convection. Air currents wafting past the warm stove picking up HEAT and becoming less dense. Rising ever upwards until cooled again through adiabatic mechanisms. ;-)

OR

Heat from the stove could be transported by conductance. Like when you fall against the hot side panel and place your hand between to catch your fall. Burning the skin so badly the top layer sloughs off in a sheet.

But hey! Maybe you have a special wood stove that ONLY makes a never heard of sort of heat called radiator heat.

IDK, I'm guessing.

And if one is curious to better understand the difference between HEAT and temperature, try this.

Heat up your kitchen stove to about 450 degrees F.

Open the oven door and stick your hand in. THAT"S TEMPERATURE you are feeling all over the skin of your hand. (a combination of conductance and radiative heating)

Now, Touch the metal rack with your finger. Feel the burning flesh? THAT"S HEAT! (PURE conductive heat transfer)

convection occurs WITHIN a given medium, Conductance occures between different mediums, radiation doesn't require a medium, only a difference in temperatures between two separate surfaces.


All I know, is the "heat seems to all go upstairs". ;-)

My wood stove only produces radiant heat. Maybe yours has special crystals or something that defies physics.

 

[bunyip]

We have a heater in a corner with a fan that pushes hot air out the front, we put one of these fans on the top to move hot air to the side, heater gets hot, fan spins and i have noticed that my bank account is $50 lighter, we have two ceiling fans, both are reversible, the one closest to the heater drawing up and the other down creates a gentle flow and heats the entire area evenly and cost very little to operate, we had these already and could have saved $50.

 

[CalG]

My wood stove only produces radiant heat. Maybe yours has special crystals or something that defies physics.

Again

A stove does not "produce" just one form of heat transfer or another.
At least not on earth.

One could limit conduction and convection by placing the hear source in a vacuum (much as the sun is) but then it would be very hard to keep the fire lit. oxygen and all.

Or one could prevent all radiant heating by surrounding the stove with even hotter surfaces. "HEAT" always moves from the warmer to the colder.

Have you ever had one of those kitchen "convection ovens" ? The ones with the internal fan?

 

[Snobdds]

Again

A stove does not "produce" just one form of heat transfer or another.
At least not on earth.

One could limit conduction and convection by placing the hear source in a vacuum (much as the sun is) but then it would be very hard to keep the fire lit. oxygen and all.

Or one could prevent all radiant heating by surrounding the stove with even hotter surfaces. "HEAT" always moves from the warmer to the colder.

Have you ever had one of those kitchen "convection ovens" ? The ones with the internal fan?

What forms of Convection and conduction does a wood stove produce?

 

[Doughknob]

what comes off a stove so a fan can move? A stove only can make radiant heat...it takes another energy source to convert it to convective heat.

Go play pong with someone else.

Wrong. Look up the 3 types of thermal heat transfer.

 

[Doughknob]

What forms of Convection and conduction does a wood stove produce?

3 types of heat. Look it up instead of guessing.

 

[Doughknob]

My wood stove only produces radiant heat. Maybe yours has special crystals or something that defies physics.

Wrong again

 

[Snobdds]

3 types of heat. Look it up instead of guessing.

A wood stove produces radiant heat.

I want to know from cal, how a wood stove produces convective heat and conductive heat?

 

[Snobdds]

Wrong again

You keep saying that but always fail to explain it.

The floor is yours...

 

[herm0016]

@CalG
a lot of people do not have any understanding of heat transfer.

You hear a lot of "it's always 72 according to my thermostat, why do I feel cold in the winter!" a: radiation heat transfer to the cold wall surface despite the air temp

better though to describe it as heat transfer instead of just "heat". its about the movement of energy, not just the energy.

@Snobdds

your stove produces heat, and that heat is transferred to your body or wall by different methods including radiation, convection and conduction.

conduction to the air touching it, or the pot of water on top
radiation due to the temperature difference between objects ie: stove side and wall
convection is how we quantify a fluid (air) being warmed by the other 2 and then it moving and being replaced with lower temperature fluid (air) due to its density being reduced.

a wood stove is very good at radiation heat transfer, but its not the only thing happening. it's why it feels so damn good in a room with a hot stove on a cold day. the wall surface in the rest of the house is cold and your body is radiating energy to the walls. in the room with the wood stove and its radiation, the wall surfaces are much warmer, plus you are getting heat input into your body by the temp difference between your skin and the stove, not to mention the convection currents of air around it.



aside: my heat transfer professor designed the radiators on the space station! in space all you get is radiation heat transfer but its pretty efficient from your hot surface to the near 0 kelvin of the depths of space.

another aside: silver is the best at reflecting light and gold surfaces are the best at reflecting heat, this is why the mirrors are gold on the new space telescope, its designed to look into the infrared spectrum, which is the wavelengths we feel as heat, but can not see. james webb can "see" in this spectrum.