Motor Ventilation
Motor Ventilation
(OP)
All,
I am presently working with a tandem set of DC motors. On these DC motors there are 2 blowers each supplying approximately 7K CFM. What I was thinking about doing ... Rough Idea basically is removing the 2, 15 HP blowers and routing duct work to a single lets say for grins 150HP AC motor with a blower configuration. My question is this. I am not familiar with dampening but, could I put a pressure switch or dampeners that would adjust the pressure to each motor accordingly? I know this is slightly confusing but, I am wanting to maximize the efficiency of this system. Presently there are 4 15 HP blowers running during our run time. Thinking one motor supplying both motors.. Thanks! Fish
I am presently working with a tandem set of DC motors. On these DC motors there are 2 blowers each supplying approximately 7K CFM. What I was thinking about doing ... Rough Idea basically is removing the 2, 15 HP blowers and routing duct work to a single lets say for grins 150HP AC motor with a blower configuration. My question is this. I am not familiar with dampening but, could I put a pressure switch or dampeners that would adjust the pressure to each motor accordingly? I know this is slightly confusing but, I am wanting to maximize the efficiency of this system. Presently there are 4 15 HP blowers running during our run time. Thinking one motor supplying both motors.. Thanks! Fish





RE: Motor Ventilation
RE: Motor Ventilation
You didn't mention the power rating of the cooled motors. What, 2000HP?
And you propose adding a single point of failure?
How much downtime and lost money would be associated with a failure of one of those monster motors?
Mike Halloran
Pembroke Pines, FL, USA
RE: Motor Ventilation
RE: Motor Ventilation
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Motor Ventilation
Operating mode A) 2 motors + 1 large blower.
Operating mode B) 1 motor + 1 large blower on VFD, motor can be #1 or #2, but this still means that if the SINGLE blower goes down, you lose ALL possible operations and what I know of the shredding business, no shredding = no revenue.
You goals are laudable and attainable: saving energy, increasing operating performance by improving cooling air quality. Aside from missing the redundancy issue, the other thing I see missing is that if you are a SYSTEMS integrator, you must consider the ENTIRE system. Right now you seem to be thinking of this strictly as a control system problem, but there are a number of mechanical issues involved that you cannot ignore. Right off the top, you seem to be thinking you can equate air flow to current monitoring of the DC motor. That is an immediate flaw, because unless you have a TON of empirical data to know the ACTUAL HEATING effects of cyclical loading and unloading, current monitoring alone is not going to be enough info to get you there. Then you also cannot just equate blower HP to air flow, there are ducting issues, filter loading issues, maintenance requirements etc. to consider. I think you are thinking that by over sizing the blower (" ...lets say for grins 150HP AC motor...") that will cover for it, but then you want to add in a variable speed drive, which implies Variable Air Volume. You don't KNOW the required air volume now, let alone after you add more duct work and a filtration system, so how can you even begin to size the blower?
Here's my suggestion, based on going from what you KNOW to what you NEED.
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