Bleed off from Cooling tower
Bleed off from Cooling tower
(OP)
Is there any formula to ascertain the bleed off recommended for cooling towers to ensure concentration build up in the cooling water system.We find many of the cooling towers does not have the provision for bleed off thereby the refrigeration system operates almost same condensing temperature as the Air cooled condition.
What is optimum quality of water recommended for the Cooling tower.
What is optimum quality of water recommended for the Cooling tower.





RE: Bleed off from Cooling tower
After you have resolved the scale(heat transfer) problem, or installed a new tower, a bleed valve needs to be installed. Once you establish the Cycles of Concentration, you might try this: "Bleed rate" = "evap rate"(1.8gal/hr/to) / "cycles of concentration". good luck.
RE: Bleed off from Cooling tower
Good on ya,
Goober Dave
RE: Bleed off from Cooling tower
RE: Bleed off from Cooling tower
incidently, I have read case studies and all on the Dolphin water treatment system and it appears to sell good. Even ASHRAE green tips list it as an energy and water saving system.
Question, does anyone out there has good experience with it? sorry sridhar if this is a highjack of your post, but I think it is relevant to your post.
RE: Bleed off from Cooling tower
Haven't come across dolphin system can you send link please
RE: Bleed off from Cooling tower
Yiu ought to develop the instinct to google out things.
Smile - :)
RE: Bleed off from Cooling tower
RE: Bleed off from Cooling tower
RE: Bleed off from Cooling tower
Increasing from 3 to 5 cycles gives 85% of the water and chemical savings you would receive if the cycles were increased from 2 to 10.
As cycles increase, so does the fouling potential in the system. Suspended solids and contaminants also increase with the increased cycles of concentration. It is usually best to limit cycles at or below 5. Further increase does not result in significant makeup water and treatment chemical savings and may not warrant the possibility of deposit formation and system fouling.
Remember, only when water savings are of paramount importance should cycles be allowed to approach theoretical limits. Other safe and effective levels are the best.
RE: Bleed off from Cooling tower
I've had a few physical water treatment salesman make their pitch. Pretty much the NIMBY repsonse, Not In My Bundle-Your's? I've spoken with a lot of plant operators, when we get to details, the answer has been that the water chemistry is not suitable.
RE: Bleed off from Cooling tower
This is in addition to make up for carry over. Which is also 3gpm/100t. A rule of thumb from the ammonia refrigeration trade.
RE: Bleed off from Cooling tower
Of course your cooling towers need to be well maintained, have clean fill, clean basins, float valves that don't leak, side stream filtration systems etc all of which will affect performance.