1) Ventilation requirements are the responsibility of the mechanical engineer.
2) Code requirements for ventilation are typically based on occupancy (reducing CO2) in the space or they are based on limiting some other contaminant concentration (like noxious fumes, flammable gases, etc.)...
Hi Remp,
The primary method of sizing ducting serving a dust collection system is to maintain a certain minimum velocity through the duct. This velocity will allow the particles to be suspended in the air and it will also allow the particles to be transported to the collector.
The minimum...
There are four pieces that are typically submitted to the client:
1. Drawings: Full size drawings, hard copies, electronic, sufficient amount to send out to bid, permit or review.
2. Specifications: Complete specifications, same amount of copies to match the drawings, typically.
3. Cost...
Hi kbs, you should take a look at the fan curve of your fan. At various operating points, the fan's efficiency and therefore power usage may change. How much it will change is dependent on your fan.
Justin K, P.E.
http://www.engproguides.com
Your colleague is correct. It might be helpful to grab a psychrometric chart and plot the points of your air conditioning process. For example, plot (1) incoming AHU conditions, (2) leaving AHU conditions, (3) space conditions.
When your air leaves the AHU and travels the length of duct...
I know several professional engineers who have taken the PE exam and passed the exam in the discipline that they work in, which was not the discipline that they majored in college. The PE exam tests your ability to practice engineering, so don't be too worried about the fact that you did not...
I don't have your AHU and EF capacities and ESP values, can you send those?
But it seems like when both your AHU and EF are on, your EF is exhausting the air that is being supplied by your AHU and your relief dampers are not being used. It also seems like your EF is much larger than your AHU...
Absorption chillers are typically more expensive and are only used when you have large amounts of waste heat available. But as everyone has said before...you should conduct a life cycle cost analysis.
Justin K, P.E.
http://www.engproguides.com
In this type of situation, you don't have much options. I've gone through a similar type situation for a small school and needed to put in a fire pump and a tank (insufficient pressure and flow).
Justin K, P.E.
http://www.engproguides.com
Use a load calculation program to properly size your HVAC system. I use Trane Trace 700 but there are others out there.
Justin K, P.E.
http://www.engproguides.com
I am not sure of a rule of thumb for calculating total friction loss as function of the number of floors.
Pressure loss due to elevation - 2.31 feet equals 1 PSI.
There is a rule of thumb to estimate friction loss. Typically you take your system length, multiply by 1.5 (for fittings), then...
Since you are doing a government building, I am sure that you are familiar with the UFC requirements for anti-terrorism, http://www.wbdg.org/ccb/DOD/UFC/ufc_4_010_01.pdf
I am not sure why you need to provide high amounts of exhaust air for your government building? Why does this building need...
