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Machine Shop Training: Heat Treating Furnaces ATI General #3

www.machineshopcourse.com Learn about heat treating furnaces in this passage from our professional machinist course. The complete course teaches ...

Where can I find information on how natural gas furnaces and heat pumps work?

Oct 14, 2007 by HoldemLow | Posted in Engineering

Or what are the benefits/costs of gas furnaces vs. heat pumps to heat an usually American home?

Look up heat pumps on the Internet. There is too much to learn to find gentle enough answers here.

Does anyone have any experience with pellet furnaces to heat house?

Oct 06, 2006 by flowerlady4 | Posted in Maintenance & Repairs

We have an oil furnance and are rational of replacing it. We are considering pellets or electricity.

Verify out Harmanstoves.com. I know they make a pellet furnace. I don't have one, but I do have one of their free standing stoves, the Move forward model. It heats my whole house and I only use my oil to heat domestic hot water. I have used the pellet stove for three years now and it has already paid for itself in what I would have paid for oil and it's very secure, haven't had any problems. The pellets burn clean and you don't need a chimney, you hardly vent straight out the wall.

The pellets come in 40 lb bags, and a few places will deliver them in majority just like they deliver coal. On the coldest days here in PA I'd only have to fill the hopper once a day with a 40 lb bag and the ashes are very least and need only emptied once or twice per ton usage, you can even shop vac the ash out when the stove is cool. Pellets range in appraisal from $175-$200 per ton. I used 2-1/2 ton last winter.

Are all heat-exchangers of 90+ high efficient furnaces made of stainless steel?

Jun 29, 2008 by dfixer | Posted in Maintenance & Repairs

can any accomplished hvac out there show me a computation on how the returning air is affected by moving the A-coil on the RA . My hvac guy is arguing that I dont stress any extra return opening above the area where the A-coil was moved to. Doesn't the presence of the A-coil in the RA cause an obstruction to the air flow inside the RA.

If the ductwork was set up correctly to begin with, as long as the coil can be used for either "push through" or "draw through" action then it may be ok (if the rated static pressure values of the coil are close).

Duct work is designed by an alien static pressure (ESP) calculation. All the fittings, turns, sizes, etc are calculated in equivalent feet measurements. The ductwork is sized according to this discretion.

Have your technician show you his calculations to prove it will be ok.

One other thing to remember is that the condensate drain will need a p-trap installed to aside proper drainage if the coil is in the return air stream.