I'm calculating required outdoor air for a vehicle test facility where the vehicles will be running continuously in the space. Here are my calcs - please feel free to comment on anything I might be missing.
CO is the dominant contaminant. Allowable max concentration is 29 mg/m3.
CO generation...
I am exhausting 25000 cfm of air at 100% RH, 50C. This is in a northern climate and the outdoor ambient temperature will be in the vicinity of -40C at times during the winter. Do I need to be concerned about snow formation (and hence a potential maintenance nightmare in clearing it)? What about...
I have a solid petroleum compound being handled in a process building and would like to determine what gases are being "off-gased" from it and at what rates - purpose of which is to supply adequate ventilation. Can anyone tell me the type of chemical analysis I am looking for? And possibly...
We have a number of Automatic Recirculation valves in service for minimum flow protection on centrifugal pumps. Service is water condensate at ~330 F.
The issue that we are having is that there is scale buildup on the inside of the valve and it is causing the recirculation plunger to stick...
I am designing the HVAC systems for an industrial pumphouse, and am trying to determine what to use as an OA ventilation rate.
The building is normally unoccupied, and there are no out of the ordinary sources of contaminants. The building houses a number of pumps - I need about 600 cfm of OA...
I am in the process of sizing a new pump to increase the flow rate in my system from about 850 gpm to 970 gpm. The system has an existing control valve, and I simply want to determine whether the existing valve will be acceptable at the new flow rate, or if I have to install a new one.
My...
I have a rectangular duct measuring 80" x 40", containing a 1/4" thick orifice plate with a rectangular opening size of 70" x 28". I have air flowing at 100,000 CFM through the duct at 40" W.C. static pressure.
I am trying to calculate the pressure drop across this orifice. The only equations I...
I am designing an HVAC system for an industrial building that will utilize a 40 m long x 15 m diameter rotating drum, open at both ends to mix hot water (T=80C) and bitumen ore to separate the bitumen from the sand.
I'm trying to determine the required amount of OA required to provide an...
I am doing a very preliminary cost estimate for a plant upgrade, part of which will involve a 200 HP firetube boiler. I'm wondering if anyone can give me a ballpark estimate on the capital cost of one of these would be. A google search turned up approximately $200,000. Does this seem reasonable...
On a large boiler feed pump what should the maximum water line speed be, for both the inlet and the out let of the pump usually exppressed in Ft Per Second. The pump is around 300Gpm At 300 to 320 PSI. The water Temp is 230Deg F. Existing Pump has a 4" inlet Flange and a 3" outlet flange. Thanks...
A quick question regarding the service factor on the nameplate of electric motors. This is the percentage above rated HP the motor can operate safely. My question is whether this means the motor can run at this elevated HP for extended periods? Or is it simply intended for short intervals. What...
One of my colleagues is designing a system that has two centrifugal fans in series. His question to me is how the static pressure is developed in the duct.. for example, each fan is generating 5000 cfm at 12" W.G. There is approximately 20 feet of duct before the first fan, and 20 feet of duct...
Could someone please explain to me the difference between an over air port and a side air port?
Steamguy2
www.SteamPlantEngineering.com - Discussion & resources for professionals in the Power Generation Industry
I am working on an industrial fan application. These are 50 hp, 1800 rpm, 10,000 cfm fans operating at a pressure of 57" WG.
The fans are mounted using vibration isolators on structural steel. There are flanged connections to both the suction and discharge ductwork. Maximum vibration is 68...
I really need to brush up on my HVAC design skills. Can anyone recommend a good book that covers duct design & fan selection procedures in detail with good examples?
This should be a fairly simple problem, but I am not sure if I have enough information to solve it.
I have a 12" diameter circular duct, 60 feet long. I have a static pressure of 25" W.G. at the inlet. This duct is discharging into another duct having a static pressure of 18" W.G. I need to...
I have a client installing a ventilation system in a movie theatre. The capacity is 400 people and from ASHRAE standard 62-1999 requires 15cfm/person equalling 6000cfm total.
My question is regarding the intermittent occupancy considerations (section 6.1.3.4 of the standard). This specifies...
I'm doing some research on a company that designs and manufactures Heat-Recovery ventilation systems (HRV)s. Rather than simply using an exhaust fan, the air is first passed through a heat exchanger to heat up the incoming air.
Is it true that this is relatively new technology? Are there...
