Table of Contents
What is blowdown HVAC?
Cooling tower bleed-off/blowdown is the flushing of a portion of high mineral concentration cooling tower system water down the drain, while simultaneously replacing it with fresh water. This process dilutes the system water mineral concentrations that steadily increase due to water evaporation.
Why do cooling towers have a blowdown valve?
Blowdown is used to help avoid the over cycling of dissolved solids that would lead to deposition in your cooling system. Wasted Water – Too much blowdown forces the tower makeup water valve to open and add water to maintain the sump level.
What is COC cooling tower?
COC or the Cycles Of Concentration is an abbreviation, used when talking about cooling water or cooling tower water. The COC specifies, how often a fresh water added into the loop, can be used or pumped around, before the water has to blown down or bleed off from the cooling tower.
Is cooling tower blowdown continuous?
Cooling towers, closed circuit coolers and evaporative condensers require continuous blow down or “bleed off” with added make-up water to maintain an acceptable concentration level.
What is meaning of COC in cooling tower?
the Cycles Of Concentration
COC or the Cycles Of Concentration is an abbreviation, used when talking about cooling water or cooling tower water. The COC specifies, how often a fresh water added into the loop, can be used or pumped around, before the water has to blown down or bleed off from the cooling tower.
What is a blowdown line?
[′blō‚dau̇n ‚līn] (chemical engineering) A large conduit to receive and confine fluids forced by pressure from process vessels.
What is ORP in cooling tower?
Monitoring the ORP (Oxidation Reduction Potential)/redox is very useful in its ability to correlate millivolt readings to sanitization strength of the water. For Chlorine (Cl2) to function properly in the cooling towers it must be present in the oxidizing forms of hypochlorous acid (HOCl) or hypochorite ion (OCl-).
What is blowdown in a cooling tower?
Blowdown is one of the four ways in which the cooling tower loses water. Other mechanisms are Leaks/Overflows, Drift, and Evaporation. Evaporation is the main role of the cooling tower, as it helps transfer heat to the environment.
What is a blowdown valve and how does it work?
A blowdown valve is a valve that opens to release water from cooling water systems. It is usually trigger by a cooling tower controller or another piece of mechanical equipment. What are the benefits of a Motorized Ball Valve blowdown valve? The model is a motorized ball valve designed as an economical alternative to solenoid valves.
What is the relationship between COC and blowdown?
•Simple rule: to increase COC, decrease blowdown; to decrease COC, increase blowdown. •COC can be adjusted to allow for lower rates of water use, corresponding to lower rates of water chemical treatment use. Blowdown Required Equation •Water evaporation loss can be used to determine the blowdown rate needed to operate at a given COC.
How is the concentration of dissolved solids in blowdown water determined?
This is determined by calculating the ratio of the concentration of dissolved solids in the blowdown water compared to the make-up water.