Heater for a poorly insulated garage

[LK1]

i have a 40,000 BTU "infrared" propane heater installed in a VERY airtight, insulated shop and, i can tell from experience, your advice is poor advice.
"infrared" heaters DO NOT heat the items in the room, they heat the air which in turn heat the items. i go into a nice long factual debate with you on this one if you wish.

Sorry I twisted your undies all up. If you read my post I stated that an "infrared heater pointed at you may work".

He didn't ask how to heat the whole shop, if I read the original post correctly he was asking about staying warm in a poorly insulated shop.

My experience with infrared heaters is that they will keep the object (person) they are pointed at warm. Are you saying this is incorrect?

 

[yooper]

i have a 40,000 BTU "infrared" propane heater installed in a VERY airtight, insulated shop and, i can tell from experience, your advice is poor advice.
"infrared" heaters DO NOT heat the items in the room, they heat the air which in turn heat the items. i go into a nice long factual debate with you on this one if you wish.

 

[Chang-kuao-lo]

500,000 btu, biotches...

 

[cruiser88]

yea and I have seen shortages in pellets a few times. My mom has a huge mofo and its not worth a damn

i would stay away from the pellet stoves, they are a pain in the ass, and they do not put out the heat a wood stove does, put a fan behind the wood stove.

 

[cruiser88]

thats da bomb....no blower required

500,000 btu, biotches...

 

[Chang-kuao-lo]

it'll take your eyebrows off at 2 feet.

 

[splitshot]

thats da bomb....no blower required

Just the one vented to outside air to keep the shop from burning down..

 

[Hank]

Radiant Heater Heatstar F170700 35000 btu Propane Gas

Love it.

 

[gmarshall7]

wool socks.

 

[Chang-kuao-lo]

12v heated vest.

 

[nomembername]

i have a 40,000 BTU "infrared" propane heater installed in a VERY airtight, insulated shop and, i can tell from experience, your advice is poor advice.
"infrared" heaters DO NOT heat the items in the room, they heat the air which in turn heat the items. i go into a nice long factual debate with you on this one if you wish.

"Infrared" or infrared? If you want to get into a factual debate on infrared heat, the first thing you'll do is retract your quoted post because it shows an utter and profound lack of understanding of what infrared is and how infrared heat works. Care to dance?

 

[crushers]

yep,
bring on the propaganda ...

 

[yooper]

other's what?

 

[nomembername]

yep,
bring on the propaganda ...

No propaganda. Infrared heat, being a form of thermal radiation, can be transmitted in a lack of air - say, for instance, a near vacuum like outer space - unlike convective or conductive heat. That's how we get our heat from the sun. Infrared heats the objects it encounters, as does any other form of radiation. Just like our little blob of rock we call the earth, it is the heating and cooling of the surface of the earth that heats and cools the air, not the other way around.

Infrared heaters, like the propane-fired tube heaters many shops use, heat the floor, the walls, the vehicles, the benches, the toolboxes... and even the people. They don't heat the air. It is then the convection of air moving across the warmed objects then transfers heat from objects to the air, not the other way around.

Thermal radiation is physics, not propaganda. Science, not slogans.

 

[crushers]

oh wise one, i bow to your great understanding ...
but
explain this to me, if all the items in the room is 61C and the heat is true infrared then how can the ceiling ever be 85C?

 

[yooper]

Read his post again Wayne and think about it, it's consistent and gives you the answer.

 

[crushers]

i understand the principle but how does a ceiling end up 24C HOTTER than the objects generating the heat? the objects are 61C, the ceiling is 85C so unless the initial source of heat is actually heating the air then there is no possible way that the ceiling can be hotter than the objects in the room.

by principle application the ceiling should be 61C.

Heat rises, but heat does not get hotter as it rises, the heat will stay at the same temp as the source of heat.

 

[toy4xfun]

yooper i already know that i am an idiot, so you really do not have to respond to this post.



ok i am not familiar with the Gas or propane infrared heaters, but on an electrical one they have a tube, kind of like a fluorescent light, inside that tube there is a resistor, what ever else is present in that tube, i have no idea, but when that tube heats up it does heat the air, and if the heater is pointed at say a tool box it will heat it, but the air is heated to, so what makes this different than say a base board electric heater?

 

[yooper]

i understand the principle but how does a ceiling end up 24C HOTTER than the objects generating the heat? the objects are 61C, the ceiling is 85C so unless the initial source of heat is actually heating the air then there is no possible way that the ceiling can be hotter than the objects in the room.

by principle application the ceiling should be 61C.

Heat rises, but heat does not get hotter as it rises, the heat will stay at the same temp as the source of heat.

Heat doesn't have a temperature. Heat is energy. Heat does not rise.

Hot air rises because it is lighter than cold air. As the room stratifies the hot air gets concentrated at the ceiling. Unless you have a fan moving the hot air back down that will always be the hottest part of the room.

The objects are continually cooled by the cooler air moving past them and their temperature equalizes with the surrounding air fairly quickly.

The heating element is quite hot, on the order of 1000-1800°C, and the shielding around it is also quite hot, so there is going to be some conductive heating of the air and some convective heating of the room, but this is considered waste heat. More efficient IR heaters will lose less heat this way.

The air does absorb and is heated by a small amount of IR but not very much.

Do not confuse heat and temperature. They are not the same thing.

 

[crushers]

the radiant propane ceiling heaters push heat down a tube, the tube has a resister coiled steel liner that slows the flow down, the heater also has a metal reflector that directs the heat in the direction that you want it to generate. the heat "radiates" (infrared) towards the objects in the room theroeticly heating the objects in the room. if you have snow under the vehicle when you bring it in then the snow will be the last thing heated (and the floor) since the vehicle is in the way of the "radiating" heat. if you are working under the vehicle you will not get heat from the heater.

radiating heat (infrared) does radiate from the source ... hummm ... so does a wood stove without a fan pushing it.

but, the folks that sell these heaters proclaim they are extremely fuel efficient since they heat the objects in the room and those objects hold the heat and radiate heat back out.

the question still stands, as i asked the experts when i was going through 5 times the amount of propane that this unit was advertised as using, why is the ceiling 24C hotter than the objects in the room? It will be interesting to hear the answers that these guys come up with since the experts could not answer the question. my shop has been inspected by 4 different companies and has been confirmed to be VERY air tight and very well insulated.