· I am fascinated with the idea of compressed air as energy to do
works. I know that most businesses uses compressed air systems to run
their pneumatic tools, I also understand all the advantages in running
those kinds of systems. What I luck of understanding is that
compressing air require electricity in most cases and the energy in
the compressed air is less than the energy invested in compressing the
air, the process require electricity to run an electric motor to
compress the air, the air is than looses its heat and than used for
work on tools, my questions is why go through all this hassle and the
losses of energy to frictions and heat losses, why not run the tools
directly from the outlets and preserve some of the energy that we
loose to the compressing process. I understand the benefits of having
compressed systems when it come to power to weight ratio, and the
reduction of so many electric motors in our tools, I am also aware
that some manufactures need compressed air systems in places where a
spark is a hazard. But wont it be more energy efficient if we run
electric motors on our tools? What is the real advantage for using
compressed system?
· I understand that as you compress the air the molecules are bouncing
at each other and producing heat, if you let the compressed air sit in
the tank long enough for the heat to dissipate the air inside will
still have energy to do work, how substantial is the difference in
energy the compressed air has when its hot and when its cool (For the
sake of calculation. 100 gallon at 100 psi and the surrounding
temperature is 75 f)?
· What would be the amount of energy the compressed air will have if
after it is compressed I will heat it even further as to double the
heat temperature, and will the PSI increase?
· I understand that as the compressed air expands it is cool down. If
the compressed air in the air tank has lost its heat to the
surrounding and reached the room temperature, if you release the
compressed air and allow it to expand will it cool down even further
than the room temperature?
· If you have two different tanks one measure 20 inch?s diameter and
73.5 inch?s length which will give a tank of 100 gallon and the second
measure at 30.8 inch?s diameter and the length is 30.8 inch?s which
will give you a tank of 100 gallon as well, I understand that by
compressing the air into both tanks at the rate of 100 PSI, both will
have the same temperature and the same energy, now, if you connect an
extremely fast valve at 8 inch?s diameter to the side of the tank and
allow it to open at the same rate in both tanks will the tanks shape
have a significant effect on how fast the compressed air will flow
out? If it does what would be needed to balance the output, more air
volume to the tank or more pressure?
· Does hot pressurize air and steam can be compared?
· If you release compressed air through a nozzle will it increase the
pressure and the heat, ssuming the answer is yes, will the volume of
the air flowing will be less and the pressure will increase. What is
more efficient in terms of work and power, high flow of air at lower
pressure or higher pressure at lower flow, assuming both will be
relative to each other?
· If you take a regular reciprocating compressor that can compress air
to 100 PSI, I assume that each stroke of the piston is at the rate of
100-PSI compressions. My questions is if you put a little turbine at
the edge of the outtake valve what would be the difference in work
done on the turbine if you use two scenarios, one- you allow the
piston to compress the air and than open the valve and allow the
pressurize air to flow through the turbine and the seconds is, the
valve is open and the piston pushes the air through the turbine? |
Request for Question Clarification by
pafalafa-ga
on
09 Sep 2005 04:43 PDT
Hello guyugfi-ga,
You wrote:
>>I understand the benefits of having compressed systems when it come
to power to weight ratio, and the reduction of so many electric motors
in our tools, I am also aware that some manufactures need compressed
air systems in places where a spark is a hazard. But wont it be more
energy efficient if we run
electric motors on our tools? What is the real advantage for using
compressed system?<<
I don't quite get your question...aren't these benefits 'real'
advantages? Real enough to warrant the use of compressed air, even at
the loss of some overall efficiency?
Compressed air systems allow the very heavy compressor to be separated
from the actual tool being used. This can be quite important. The
alternative of building in an electric motor right on the tool itself
can make the tool too heavy to be practical.
Tell us a bit more about what you see as the key issue(s) involving
compressed air vs electric motor. Perhaps we'll then be able to help
you.
As for your follow-on questions, I think there's probably far too much
there to be worked on -- even for a question priced as yours it. You
may want to consider paring things down quite a bit.
Thanks,
pafalafa-ga
|
