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Thread ID: 142719	2016-08-26 23:48:00	Super Heat Lamps for instant Warmth?	kahawai chaser (3545)	PC World Chat

Post ID	Timestamp	Content	User
1425018	2016-08-26 23:48:00	Anyone know or used similar? Looking to "heat blast" instantly one of our large bedrooms from the top down - which rarely see the sun. Don't want any of them generic large floor heaters, Too slow and too low height. I saw similar on a episode of the old Mission Impossible TV serious., where Barney the tech guy used massive lamps to quickly melt a stash of gold bars to drain down a hole. Then instantly painted the small cavern room with a spiral spray painter rotor. Then instantly heat blasted the room to dry the paint...	kahawai chaser (3545)
1425019	2016-08-27 02:10:00	Do you really want to heat the room or do you want to dry it out? We have a bedroom on the south side of the house that never sees the sun and it was very damp and cold. It even had a green growth on the outside wall. We had a ventilation system installed and now the bedroom is much warmer and dryer and there is no longer any green growth on the outside wall. We are very impressed and very happy with the results. The whole house is much warmer and especially dryer.	Roscoe (6288)
1425020	2016-08-27 03:30:00	Heat lamps aren't particularly good heaters, and draw more current than light fittings should really be used for. Use a regular heater and open a window for a few minutes a day. If you want to heat a bedroom fast a decent 2KW fan heater is the best portable option. Personally I use a 1KW convection heater that can be wall mounted, takes about 30 mins to take the chill off and about an hour to really warm the room. I like it because I can leave it on overnight on the thermostat and it's silent, not what you are looking for by the sound of it.	dugimodo (138)
1425021	2016-08-27 03:47:00	Anyone know or used similar? Looking to "heat blast" instantly one of our large bedrooms from the top down - which rarely see the sun . Don't want any of them generic large floor heaters, Too slow and too low height . . It may have escaped your notice, but hot air rises, as the Montgolfier Brothers proved in 1783 with their balloon flight . Trying to distribute heat from the top down is doomed to failure (unless you use forced-air circulation) so you may have to swing a hammock just below the ceiling if you want to keep warm at night . No matter what you do, any heat source will deliver a heat gradient that is cooler at floor level and warmer at the ceiling . You won't see steam at floor level, but you might see frost . First get your heat source, then use fans or other means of air circulation to distribute the warm air . :thumbs: Cheers Billy 8-{)	Billy T (70)
1425022	2016-08-27 06:14:00	Sounds like what's needed is an infrared patio heater. Instant heat. It heats whatever the rays hit, such as the floor (in the present case). This would heat up and warm the air above - a more efficient process than heating the air directly in a non-infrared heater. If you heat the air in a convection heater it immediately rises and doesn't heat anything below. Also, solid objects are easier to heat than air. If you want solid objects to be heated (people, bedding, walls...) it doesn't make sense to heat air and hope the air heats the target (BillyT - I know what you mean when you say hot air rises, but actually it doesn't! The only force acting is gravity and that pulls everything down. That includes air of whatever temperature. It's just that cold air is denser and sinks to the bottom thereby pushing hot air up, provided there's not too much mixing. I learned this lesson the hard way (that hot air has no tendency to rise). I was trying to get the downstairs heatpumps to provide a bit of warmth in our bedroom upstairs. This involves the heat going up the stairs and along a corridor - a kind of 'chimney'. I reasoned that if hot air has a natural tendency to rise, I should leave a window slightly open in the bedroom so that the hot air rising up the stairs can 'push' the bedroom air out the window and enter the bedroom more easily. But it didn't work and I soon reasoned why. All that opening the bedroom window did was let in cold air which sank down the stairs and cooled the room below! I realised that the whole process of hot air rising is driven by cold air sinking. When we say that hot air rises, we normally mean a closed space where the warm and cold air masses don't mix too much. Or we mean a fire-place where cold dense air outside the house leaks in and pushes warm lighter air and smoke up the chimney	BBCmicro (15761)
1425023	2016-08-28 09:21:00	Ok thanks. Seems economical indoor domestic method is some kind of ventilation and a convectional heater. I was at a kids birthday party yesterday and the massive hall had large recessed heat lamps (IR I think). Could feel the heat "rain down" om me when sitting directly below it - even from about 30 feet high. But no real heat noticeable throughout the hall - kind of directed at the tables only. iR Patio heater lamps seems the way for instant heat (if localized), but some are over 400 US dollars. Though some are ceiling heated large fans. As for heat introduced in a room, as BBC Micro says, hot air is basically displaced from cold air. I worked in air cond labs set at ambient (23 C/50 % RH), and did temp - moisture content tests by changing the lab temps - by heating or cooling. Relative Humidity (the amount of present moisture per unit volume compared to saturation) has an effect on the rate (and time) of introduced hotter air to reach temp equilibrium. The drier the room the quicker generally it would warm up when hotter air is added. I think some kind of thermodynamic effect (1st law maybe), in that hot air/or from a body naturally radiates to colder surface/body.	kahawai chaser (3545)
1425024	2016-08-28 22:39:00	Just use microwave for personal heating . They will heat your body, but not waste power heating the air. Put some metal shielding over you eyes though Fortunately, they wont melt your stack of gold ,as per the MI episode. :) otherwise, get a fan heater(or several) & stop trying to break the laws of physics :-) heat is infra red btw . No infra red, no heat (sort of)	1101 (13337)
1425025	2016-08-28 23:00:00	Radiant heat is infra red and anything above absolute zero is a source of radiant heat but not all heat is infra red. So just to be pedantic you had it backwards, No heat, no infra red. No need to overthink it, bedrooms are a small space and easily heated unless the insulation is terrible. Those small panel heaters are typically only 500-800W and manage to keep most bedrooms comfortable. Close the door and crank up a fan heater for 10 minutes, job done. The 1KW convection heater I mentioned I use I set to quite low on the thermostat and it kicks in and out every half hour or so once the room is warm. Even when there's a decent frost it's not struggling to keep the room warm.	dugimodo (138)
1425026	2016-08-29 03:15:00	I don’t believe you guys. Have you not heard of “Global Warming”?	B.M. (505)
1425027	2016-09-01 06:40:00	(BillyT - I know what you mean when you say hot air rises, but actually it doesn't! The only force acting is gravity and that pulls everything down. That includes air of whatever temperature. It's just that cold air is denser and sinks to the bottom thereby pushing hot air up, provided there's not too much mixing. I refer once more to the Montgolfier brothers and all hot-air balloonists since. Hot-air balloons do not rely on cold air to push them up. However, gravity does play a part, because hot air expands and therefore is lighter than the equivalent volume of cold air, consequently it heads for the ceiling or the clouds. Similarly, ice floats because it has greater volume for its weight, and not just because it because it displaces warmer water. My chimney is a very good example of why your theory must fail. Cheers Billy 8-{)	Billy T (70)
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