Last week the article covered pressure drop correction calculations. Today we offer you some handy charts to use for second glycol correction pressure drop. Example: I have calculated the water piping pressure drop through a chilled water system to be 80 feet using the System Syzer. Question: What is the pressure drop if I have 50% Ethylene Glycol/Water with temperatures of 45°F to 55°F? Answer: The average temperature is 50°F, so my factor is 1.47. [Read more…]... READ MORE
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Question: I have selected my piping friction loss based on water, but I am pumping a glycol solution. What correction do I use? Answer: There are three glycol corrections when designing a hydronic or process cooling system; heat transfer correction, pressure drop correction, and pump curve correction. This R L Deppmann Monday Morning Minute defines the second of three glycol corrections. [Read more…]... READ MORE
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Most cooling tower designs and installations are commissioned without any issues. The few percent of times where problems arise will cause multiple meetings, emails, finger pointing, and added costs. The issues are not caused by bad luck or bad Karma; tower water pumping issues are typically caused by air, dirt, or improper application. [Read more…]... READ MORE
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The Clothing They Wear. Chemical feeders or “Pot-feeders” want to be fashionable too. Specifying a chemical feeder without a detail is like telling your son he should wear a suit to a special dinner. You assume he will wear socks and shoes, but can you be sure that he will? [Read more…]... READ MORE
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“An old friend with several new twists” Chemical feeders or “Pot-feeders” have adorned mechanical equipment rooms for decades. R.L. Deppmann appreciates the specification and purchase of the Griswold 2 and 5 gallon feeders. Today, I’ll present a couple of the benefits both owners and installing contractors may enjoy when using the Griswold Feeders. [Read more…]... READ MORE
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R. L. Deppmann Company Monday Morning Minutes addressed corrections to system GPM (gallons per minute) and system friction head during the last three weeks. Today we look at the pump selection. Centrifugal pump curves and the brake horsepower required changes depending on the fluid. In HVAC design we normally assume water is the pumped fluid. There are many times when the assumption is water, since there is no fluid mentioned on the schedule, yet we find a glycol makeup unit attached to the system. [Read more…]... READ MORE
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Pump curves are based on water, but I am pumping a glycol solution. How will this affect the selection? This week we define the first of three glycol corrections. There are three glycol corrections when designing a hydronic or process cooling system; heat transfer correction, pressure drop correction, & pump curve correction. The first correction we’ll look at is heat transfer correction. When choosing chillers, boilers, heat exchangers, and terminal units, it is important to select them using the correct system fluid. [Read more…]... READ MORE
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