Rubber Industry

ARPM Rubber Manufacturing Blog

The ARPM Rubber Manufacturing Blog allows members to rapidly communicate with each other. Post both questions and answers to questions that other ARPM members have about any industry topic from material and process issues to R&E Tax Credits and other business issues.

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Rubber Manufacturing Blog / Equipment / Closed-Loop Process Cooling Water
Posted:  23 Jun 2014 21:27
We currently have an open system that uses water tower cooling.  The water tower is at the end of it's useful life.  We have decided to move to a closed-loop system.
We have had an engineering consultant propose a system with two heat pumps and an air handler to disperse the acquired heat.
My questions is:
Does anyone have experience with a heat pump vs. a chiller?  Are heat pumps as reliable as chillers?

If you have a closed-loop system, are you running water or glycol and why?


Posted:  23 Jun 2014 21:58
I can't help much with the heat pump but we do use a closed loop system with enviro-friendliest glycol as a media (as opposed to oil or water). Glycol won't freeze, resists evaporation, won't corrode your system. We run through filters and then through outdoor chillers. Versus a heat pump I would think the constant temperature of the water would be helpful in summer but the rest of the year the ambient temperature of the air used to cool is usually lower, at least here in New England. I'm not sure about the efficiency of air cooled vs. water from a cost perspective.

Jim Meagher, G.M.
Posted:  23 Jun 2014 23:12

How often do you have to add fluid to the glycol side of the system?  I've also heard that glycol has a lower heat transfer properties than treated water.

Posted:  24 Jun 2014 15:15
We buy two drums / yr. (55 gal.)We use to heat/cool all of our injection molding heads as well as cool the oil reservoirs through heat exchangers on all of our Molding machinery which equates to about 45 machines. We have two systems, one in each building, doing the same task. We use about 55 gal. in each one annually.I'm not familiar with the thermal transfer properties versus other media but it has been working here for over thirty years. I'm not sure if you recall, but you visited our plant two years ago to look at our Panstone presses that you where considering purchasing at the time.Good Luck.
Jim Meagher