SCR dimmer control for portable electric heater??
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From: William Sommerwerck on 21 Mar 2010 13:16 >> I rather like the idea of wiring two heaters in series. This >> will reduce the total output to half of what it was, but it will >> be better spread around the room, which might be a net >> improvement. > Why not use 4 heaters in series? Or maybe even 8 or 12 or 16? How about four in series-parallel? That would be the same heat output as one, but you'd (probably) need to cycle them on less often for the same degree of comfort. Regardless, I've never understood why radiators and heating fixtures are place right next to the windows.
From: Michael A. Terrell on 21 Mar 2010 14:23 William Sommerwerck wrote: > > >> I rather like the idea of wiring two heaters in series. This > >> will reduce the total output to half of what it was, but it will > >> be better spread around the room, which might be a net > >> improvement. > > > Why not use 4 heaters in series? Or maybe even 8 or 12 or 16? > > How about four in series-parallel? That would be the same heat output as > one, but you'd (probably) need to cycle them on less often for the same > degree of comfort. > > Regardless, I've never understood why radiators and heating fixtures are > place right next to the windows. If they are placed along inner walls the room temperature is uneven. Since heat escapes through walls, windows & doors you need to replace it. Then, the center of the house will stay warm from convection currents and the lower heat loss through a ceiling or roof. -- Lead free solder is Belgium's version of 'Hold my beer and watch this!'
From: mm on 21 Mar 2010 17:23 On Sun, 21 Mar 2010 11:56:40 -0500, me(a)privacy.net wrote: >mike <spamme0(a)go.com> wrote: > >>How much improvement are you expecting? > >The goal was to keep internal thermostat contacts from >wearing out.....IF and only if I could get a heavy duty >enough unit at low cost that is I've only had one thing where the contacts wore out and that was decades old. Not counting engine ignition points. >Plus it seems to me it would help give more even heat? Why would it do that. If you want more heat, turn the thermostat up. AIUI, this should have been cross-posted to alt.home.repair, instead of asking the same question in two newsgroups. That way everybody could have the benefit of what others say, and they wouldn't repeat what was said elsehere already.
From: mm on 21 Mar 2010 17:26 On Sun, 21 Mar 2010 14:23:49 -0400, "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote: > >William Sommerwerck wrote: >> >> >> I rather like the idea of wiring two heaters in series. This >> >> will reduce the total output to half of what it was, but it will >> >> be better spread around the room, which might be a net >> >> improvement. >> >> > Why not use 4 heaters in series? Or maybe even 8 or 12 or 16? >> >> How about four in series-parallel? That would be the same heat output as >> one, but you'd (probably) need to cycle them on less often for the same >> degree of comfort. >> >> Regardless, I've never understood why radiators and heating fixtures are >> place right next to the windows. > > > If they are placed along inner walls the room temperature is uneven. >Since heat escapes through walls, windows & doors you need to replace >it. Then, the center of the house will stay warm from convection >currents and the lower heat loss through a ceiling or roof. He makes a good point however. By placing them near the window, the hottest part of the room is near the window and the most heat loss occurs, compared to placing it somewhere else. Maybe having the room temperature even is something some people would sacrifice to save money, and that pesky old environment and balance of payments. And that way the people who like it warm could sit on one side of the room and the ones who are hot all the time could sit on the other.
From: mike on 21 Mar 2010 23:51
me(a)privacy.net wrote: > mike <spamme0(a)go.com> wrote: > >> How much improvement are you expecting? > > The goal was to keep internal thermostat contacts from > wearing out.....IF and only if I could get a heavy duty > enough unit at low cost that is Interesting that there's no mention of that goal in your original statement. > > Plus it seems to me it would help give more even heat? Based on what? Point your thermometer at the heating surface. What's the temperature when it first turns on? What's the temperature when it cycles off? That delta-t is the measurement of heat evenness. This can be a big number with a radiant heater. Can be almost zero with a well-designed radiator style heater. The whole idea of the radiator is to have some thermal mass and keep heat even. |