The ASHRAE young engineers saw a lot of steam in the recent tour of the DTE Vantage Dearborn Central Energy Plant. The plant manager pointed... READ MORE
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Heat pump water heaters have a place in the decarbonization efforts by building plumbing designers, contractors, and engineers. Heat pumps have been part of the... READ MORE
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When should you choose to use a gasketed plate, brazed plate, or shell and tube heat exchanger? Often in HVAC, plumbing, or industrial systems any... READ MORE
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Plate heat exchangers have been around for over one hundred years but only made their debut in HVAC systems in the last 50 years. They... READ MORE
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There are a variety of unfired liquid to liquid and steam to liquid heat exchangers for the engineer to choose from. The Gasketed Plate, Brazed... READ MORE
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Top 10 Things You Should Know About Commercial Electric Boilers (Part 2)
Norm Hall
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June 6, 2022
Welcome back to Part Two of our top 10 things to know about commercial electric boilers. As mentioned last week, HVAC and Plumbing Engineers are... READ MORE
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Analog Control Signals Used In HVAC Systems
Howard Schomaker
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January 27, 2021
Back in the old days of building automation systems, most things were controlled using compressed air. This method was called pneumatics and it consisted of... READ MORE
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Glycol in for HVAC Systems (Part 3) – Pump Corrections
Norm Hall
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October 4, 2010
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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Centrifugal Pumps and Pump Curves for HVAC and Plumbing Systems
Norm Hall
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September 6, 2010
Centrifugal pumps are the “heart” of hydronic heating, cooling, and plumbing systems. Over the next few weeks, the R. L. Deppmann Monday Morning Minutes features some basic and advanced pumping topics. Let’s start with a quick review of the information contained on the pump curve. For our example, we will use an ITT Bell and Gossett model 1510 end suction base mounted centrifugal pump model 5E with a nominal speed of 1750 RPM. The horizontal axis is flow rate in GPM or gallons per minute of water. [Read more…]... READ MORE
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