As ChasBean1 (Mechanical) suggested, you need to clearly define your problem. The following might help:
1. I understood that you need to supply 10,000 CFM O/A to the room. And this is based on your ACH rate required?
2. You need also 1,000 CFM S/A to pressurize the room?
3. Is the 1,000 CFM the...
Since 1995, SMACNA has discontinued the use of the term “low pressure” & “high pressure” in ductwork design. “Duct pressure class” is now used.
In general, there is the industry accepted general practice of using equal friction, static regain, velocity reduction or total pressure to size a HVAC...
The first trnasition is obviously an irregular one. The duct is expanding on the horizontal dimension and at the same time contracting on the vertical dimension. Area- or velocity-wise this may be considered as an unsymmetrical expanding transition fitting. This system might have to be installed...
If this is a Part 3 building according to our BC Building Code or the Vancouver Building Bylaw, ASHRAE 90.1-2007 would be applicable. For our climate zone (#5) and an unconditioned floor space, insulation is not required for heating-only ducts, R-1.9 for cooling-only ducts and return ducts are...
The ASHRAE Extreme Annual Mean maximum and minimum temperature values for the Cleveland area (Hopkins Int’l Airport) are 93.4 deg F & -4.0 deg F respectively.
You may wish to look up the ASHRAE Handbook to find the pressure & temperature at the altitude for your location. You may alternatively calculate them using:
t = 59 - 0.00356620 * Z
Where:
t = temperature, deg F
Z = altitude, ft
p = 14.696 * [(1 – 6.8754 * 0.000001 * Z)] to the power of...
According to ASHRAE, the US standard atmosphere at sea level is 59 deg F (standard temperature) & 14.696 psia or 29.921” Hg (barometric pressure). The density of standard indoor air (@ 68 deg F & 14.696 psi) is 0.0753 lbm/ft3.
“Exhaust/heat only” system is never recommended. I also “would specify a dehumidifier.”
Our Pool Regulation (BC Reg. 296/2010) is not specific on the AC rates. Like ASHRAE, the recommended min. operating guidelines as published by the BC Recreation & Parks Association is 4 – 6 ACH. The actual...
You may wish to look at the new NPCC 2010 (National Plumbing Code of Canada) for those revised numbers on fixture units for water efficient and low flow fixtures.
If you’re trying to put a reheater in the duct run because it’s long and uninsulated, it’s hardly the practice. Reheater is not a substitute for duct insulation, it’s selected & installed because of a system design requirement.
The BCPC in our Province (British Columbia, Canada) only requires us to use the 15-min duration 10 –year event data for roof and on-site drainage and in Metro Vancouver, the RI (rainfall intensity) is about 10 mm (0.394”). Comparing with the 1-hr figure it is about 1.5 to 2.5 times more.
If...
You must first check with the manufacturer whether the boiler or furnace is one used with a draft hood or draft regulator. One should not by or on himself determine whether the gas appliance requires a draft control device or not.
A draft hood equipped appliance is a category I appliance...
