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Tech Tip November 1996

Cooling Supply:


In the past I wrote a tip on calculations of cooling and estimating what you might need to figure out how much tower or chiller you need. What we need to discuss now is how your water system is designed.

Basically you are supplying water to the presses and if we were to look at the your design, you probably come out of the chiller into a line and down to the machine. At this point you are limited to the output of the chiller and whatever a pump can put out. If instead you came out of the chiller and into a tank and than from the tank to a pump and into your system you now have the option of adding another pump from the tank and adding that volume and pressure of fluid into the system. Thus if the system is tied together we could put a pressure traducer into the system so that when fluid pressure drops below a certain psi the second pump kicks into play and we maintain the pressure and volume of flow into the plant and machines. We could even allow the 2nd pump to put the fluid into the system down about 4 or 5 machines where we probably need it.

On the return line we come back to the chiller and dump into a tank which than feeds the chiller. This than doesn't cost us a pressure buildup.

I sometimes have people tell me they added an additional chiller and have not seen the results that they want. We have to keep in mind that pressure, and flow of the fluid are some of the factors that affect the cooling process. Further keep the cooling to the machines separate from that of the molds since new machines can be on a solenoid that will call for water when it needs it and this could cause pulsing of the coolant. This in effect decreases a steady state of fluid flow to the mold if both mold and machine our on the same circuit.



Thanks for the time.

Steven L Silvey
Sr. Technical Service
General Polymers