I'm sure you've found the answer by now but.....
mmBTU/hr, normally written MMBH (MBH being 1000's of Btu's/hr therefore MM is 1000 x 1000 = 1,000,000 btu/hr.
The actual heating value of natural gas varies depending upon it's source (it's a natural product, in my neck of the woods it's...
I think that ddace is probably correct. If the intake and exhaust louvre area has not increased then the velocity through the existing louvres has increased by almost 60%. This will have resulted in the static pressure drop through the louvers increasing by almost 250%! If your louvre press...
I would have thought that the fan would still need to be spark resistant even though it was physically located without the room. It's the (potentially) fume laden air which passes through the fan that creates the spark resistant requirement. If the fan is on the roof and the motor is not in the...
StevenW:
I don’t think you’ll find such an animal as an explosion proof fan. It doesn’t exist. Electric motors can be explosion proof but not a fan. The best you get is some degree of spark resistance; level A, B or level C. This means that the fan is built from materials which when rubbed or...
I'd check out the TSI website too. TSI employ closed loop control; Phoenix weren't at one time, just offset control really, but I'm not sure about their stuff now.
My apologies. D R Weig and sterl are quite correct with their heat release calcs.
960kWatt x 3412Btu/kWatt x 10 secs/(3600 secs/hr)
= +/- 9,100 Btu's
Hopefully I only confused myself.
Storm:
You pose some very good questions. I like your attitude.
I can only speak for the commercial/residential/institutional (not industrial) side of things but one of the things that holds us back, particularly in North America (and in many other parts of the world), is our bottom line/first...
Lippy:
I’m not sure I understand your question. Do you mean that when you plug 822 fpm into the equation the result is the static press. drop as seen by the fan, i.e. 0.042” wc, when 1000 cfm passes through 100 ft^2 of this particular ceiling. I’m not sure that this is correct. The formula...
I wonder if someone out there could help or point me in the right direction.
Where can I find installation times (unload, set, align, piping, electrical, testing, start-up etc.) for steam (750 psig) turbine/generator units in the 2MW to 5MW range.
I have a standard man-hour labor rate book...
These things can be a real test of one’s understanding of the basic principles. Problem is that most of us in HVAC get used to things happening on a per hourly basis (btu/hr etc.) and under steady state conditions. In this case the heat gain is almost instantaneous.
So this is my view of...
DouginMB:
I don't think there's a way to easily check internal pipe corrosion but I'd note/check the following. The list is not comprehensive but it’s a start.
Find out the age of the system.
If you can, open up a few steam traps and see if the moving parts move; are they clean inside; is...
Wilkes:
That's a really good post; an excellent explanation/overview of the combustion process within boilers. Very well broken down into understandable chunks.
Thank-you.
Just out of interest, are the percentages you quote hard and fast numbers or do they vary appreciably under the influence...
Sfxf:
Theoretically if you have a fan generating 6” of static you need a trap which is 6” deep plus a safety factor to take care of any surges. If it’s a blow-through configuration the interior of the air handler casing will “see” positive static pressure. If it’s a draw-through configuration...
