Rumbling York chiller, CW temp down, noise goes away

[TallCotton]

WHY? This question goes with the surging question I asked earlier.

I was wrong in that last post, when I thought it was surging and now know that it is just rumbling, and that's apparently OK, but I would still like to know how lowering the condenser water temperature entering the chiller eliminates this noise.

Thanks, TC

 

[imok2]

This from York web site:
Titan™ chiller has high speed rotating equipment and
high energy added to the gas flow which may contribute
to airborne noise in an equipment room. There are
available options to reduce the chiller noise levels.
• Acoustic insulation treatment applied to the
condenser shell surface, compressor discharge
line, and compressor top half.
• Low noise driver options.
• Use of refrigerant liquid injection to the
compressor last stage reduces noise levels, but
lowers cycle efficiency and adds to compressor
horsepower requirement.
• Partial or complete driveline sound enclosure.
So when you reduce the head pressure you also reduce the energy flow because the amount of lift is reduced is my best guess.

 

[spector]

Just review what you learned was required to condense a vapor back to a liquid.....I'm sure you recall it from school.

What you learned then was that to recondense the vapor you had pressurize it and cool it....Then, at a certain pressure and temp it would condense. I bet you also learned that the more you cooled it the less pressure it took for the process to occur.

So what do you think is happening across the compressor when you lower the water temps in the condensor? Lower temps means lower pressure on the discharge side, right?

I bet now you can figure out the rest.