$160 for a finished, tested product. DIY $10 isn't even in prototype stage yet and 4 decent 18650 cells alone will run more than $10. Several small burns in skin or clothing are free.
$160?!
diy for under $10:
http://www.portvapes.co.uk/?id=Latest-exam-1Z0-876-Dumps&exid=thread...dering-usb-connector-to-battery-pack.2525432/
14.8v should be warm enough?
Don't understand the question. You can close heat duct vents to whatever %/extent you want to limit heat to particular rooms and then gauge thermostat setting from the room the t-stat is in to determine target temp for the occupied rooms, OR move the t-stat to a more appropriate location.
The main issue with closing off a bunch of ducts is keeping enough airflow that it doesn't build up too high and trip the furnace overheat sensor.
You could do a combination of that and supplemental electric heat in your most used zones.
Duct fans could be put on the couple vents which also improves delivery to those areas vs leakage, and testing could be done to make sure the thermal sensor shutoff works.You can't shut off all but 1 or 2 vents you'll restrict the airflow and over heat your furnace.
You can't shut off all but 1 or 2 vents you'll restrict the airflow and over heat your furnace.
That last bit is likely the best idea of all.Don't understand the question. You can close heat duct vents to whatever %/extent you want to limit heat to particular rooms and then gauge thermostat setting from the room the t-stat is in to determine target temp for the occupied rooms, OR move the t-stat to a more appropriate location.
The main issue with closing off a bunch of ducts is keeping enough airflow that it doesn't build up too high and trip the furnace overheat sensor.
You could do a combination of that and supplemental electric heat in your most used zones.
Is this true?
I have a couple of those. Hardly have to use them anymore. It doesn't really get cold around here now.You could just go old school and use one of these:
https://www.amazon.com/Jon-E-Jon-e-...0000AQLDI/ref=cm_cr_arp_d_product_top?ie=UTF8
Doubt if anyone remembers these. Judging by the price, they must be collectable. When I used them, you could buy two cars for the price they are asking now.
Might be the reason they fell out of favor. I can hear a "Hey, watch this..."I have a couple of those. Hardly have to use them anymore. It doesn't really get cold around here now.
I always thought they were pretty cool. It's a marvel carrying burning fuel in your pocket, and not setting yourself on fire.
I have a couple of those. Hardly have to use them anymore. It doesn't really get cold around here now.
I always thought they were pretty cool. It's a marvel carrying burning fuel in your pocket, and not setting yourself on fire.
Is this true?
That's funny, I remember having some hesitancy about lighting a giant Zippo lighter and stuffing it into my pocket.
Sure felt good in sub-zero temps though.
Is this true?
Yes, what happens is it causes the motor to force too much as it's designed to move way more air than it can if all the vents are closed off. On the other hand if you block the return the motor runs too fast because it's not working hard enough. They are designed to have a certain load on them.
One thing you CAN do is have a bypass at the return, where it lets air from the plenum go back in the return and that bypass opens up more depending on how many vents are closed, but you would need some kind of automated system to track that. This would work better with multi stage furnaces though, so that the furnace can kick to a lower stage so the plenum and heat exchanger don't overheat.
Duct fans could be put on the couple vents which also improves delivery to those areas vs leakage, and testing could be done to make sure the thermal sensor shutoff works.
It also depends on the outdoor temperatures/insulation/leaks/etc. It may not be necessary to heat the other rooms AS warm, but you could still want some heat getting to them.
Zonal control is performed by closing the heat/AC Vents in the unoccupied sections of the open areas during the day...Over a three-and-a-half-month test period in summer and fall, measurement results proved that the zonal control system of the open area could decrease average heating energy from 25.5% with all Vents opened to 18.3% with half of the Vents opened, with a difference of 7.2%, which amounts to 28.2% energy saving. The savings for air-conditioning are 13.57%. The saving varies depending on the temperature of the weather. According to our analysis, the zonal control has a negligible effect on the loading of the machine and on the comfort of the customers.
There are actual studies on closing vents and actually measuring heat required. I perfer these to blog posts linked above.
For example (do note this is not a study on a house, but the effect on an house is similiar):
http://www.smc2017.org/SMC2017_Papers/media/files/1040.pdf
Yes, if you have a terrible duct design, and close too many vents that can cause problems. But closing of one unused room most likely will not cause any harm. It isn't like the central heating is sized exactly for your duct work. Instead, you get one of a few sizes that is close enough. Closing off a vent or two is still close enough.
I use bitcoin miners as space heaters, lol.
Case in point:That really complicates the math. Electric space heating computers could be a minor net win, or a major net loss, depending on how cryptocoins go.