We designed a central cold air system, in which a radial fan with VFD is used to deliver 900 cfm at 50 inch static pressure. The air is to serve five outlets with 180 cfm each at 45 inch constant static pressure. Any of these five outlet can be closed by a butterfly damper any time, in other...
In the project I am working on, the client wants to use the existing PVC duct in stock for clean cold air delivery. But at that specific size, the velocity of air flowing through the PVC duct will go up to 3500 fpm (it is not fume exhaust application, no any hazard particles in the air stream)...
I am working on a project, and need to estimate how much heat is generated from the wash station using hot water spray at 100 F. The overall flow of the hot water spray is 5 gpm. If the wash station is exhausted at 3 cfm/sq ft, do I still need to cool the space? The wash station is enclosed in...
I am working on a project, and need a wet vacuum system - vacuum water off the surface of the vehicle after the washing process inside a washing booth. Does anyone know any manufactures dealing with this kind of vacuum? In order to separate the water, does the traditional cyclone separator work...
Can anyone help me with the code (united mechanical code and international code) limitation on the use of PVC duct? The PVC duct is used to supply conditioned air (not exhaut) and it is to be routed inside of the return plenum. The plenum is sprinkler protected.
What's design guide for offsets of stack and vent in domestic plumbing system? The house is only three-story. IPC has sections only for offsets of five stories or more.
Thanks in advance!
I am working on a project of three-story house plumbing design. Need some guidance and want to know anyone could tell me what's the best resources, any plumbing book for example? Thanks in advance.
Per "1997 Standard Mechanical Code", recirculating air system with a fan capacity great than 2000 cfm shall automatically shut down by means of an approved smoke detector placed in the return air stream. Could anyone explain to me why only return air stream, not discharge air stream...
In the project I am working on, the air needs to be cooled from 140 F to 50 Deg. F to serve the specific machine. The heat transfer is through an air-to-water cooling coil. The chilled water is available from a central chiller system and the supply temperature is 44 Deg. F. My question is: Is it...
Does anyone know any tool for quick calculating fixture units and sizing the plumbing piping? I have seen once, it is like the "ductulator" for sizing the duct and very easy to carry and use.
Thank you in advance!
In my project, the furnace room has large amount of heat exhaust, and need cooling in the summer. My question is how to design the furnace room for the winter time. Can we use the heat from the furnace to heat the room? That means, we may only need to stop or decrease the heat exhaust in the...
In my project, one new Air Handling Unit is to serve several conference rooms and large restrooms nearby. The outside air for the conference rooms is based on 20 cfm per person as per ASHRAE standard 62. My question is: How should I decide the outside air requirement for the restrooms? Can I...
In the project I am working on, the sound level of the fan is known, and the end of the duct is 50 ft away from the fan. I want to find out the sound level at the end of the duct. Is there any formula to calcuate this? Does the same formula apply to the piping system sound calcuation?
Thank...
What is the material typically used for interior and exterior process vacuum piping (NOT cleaning vacuum)? The vacuum pump is rated at 28" Hg, and the piping should be strong enough to handle 28" Hg. negative pressure.
Does anyone know any reference book for process vacuum system...
What is the material we typically use for interior and exterior process vacuum piping (NOT cleaning vacuum)? The vacuum pump is rated at 28" Hg, and the piping should be strong enough to handle 28" Hg. negative pressure.
Does anyone know any reference book for process vacuum system...
The project I am working on requires both temperature and humidification control of the design space. The indoor dry buld temperature is to be maintained at 68 F, and the relative humidity is no higher than 40%. As per the Psy. chart, the maximum supply air temperature has to be around 42-43 F...
I am working on a project, and there is a 20-ton air handling unit and electrical PDU (about 4kw heating load) in the mechanical room. The wall of the mechanical room doesn't go all the way up to the structure, and open to the plenum space above the ceiling. All the plenum return air in other...
