Acceptance Volume of Expansion and Compression Tanks – Part 3

Norm HallExpansion/Compression Tanks, Monday Morning Minutes, Tanks, Hydronic System Design, Expansion and Compression Tanks

In part 2 of the R L Deppmann Monday Morning Minutes we determined the initial and final temperatures of the hydronic system in order to calculate the expansion tank selection. When we heat the water in a hydronic system, the water expands. This expansion is expressed as Ew in the formula: Ew – Ep = The expansion of the water minus the expansion of the pipe.

Expansion and Compression Tanks Formulas – Part 2

Norm HallMonday Morning Minutes, Tanks, Hydronic System Design, Expansion and Compression Tanks, Expansion/Compression Tanks

Last week the Monday Morning Minute introduced the expansion and compression tank formula. We described the numerator as the tank acceptance. The formula is (Ef – Ep) X Vs where Vs is the system volume and (Ef – Ep) is the expansion of the fluid minus the expansion of pipe. Let’s review some of the required data.

Expansion and Compression Tanks Series – Part 1

Josh LooperExpansion and Compression Tanks, Expansion/Compression Tanks, Monday Morning Minutes, Tanks, Hydronic System Design, History

We could entitle the next dozen weeks as: TANKS-A-LOT. (Sorry). Over the next few months, the Monday Morning Minutes blog will examine expansion and compression tank sizing. We will also tackle some more advanced issues in the selection and troubleshooting of closed system expansion tanks. Tanks are often selected using software programs such as the Bell and Gossett ESP-Plus™ selection program.

Griswold Chemical Pot Feeders

Norm HallChemical Feed, Chemical Feed, Monday Morning Minutes, Hydronic System Design, Air and Dirt Control

“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.

Heat Added to Chilled Water Systems Due to Pump Efficiency

Norm HallMonday Morning Minutes, Pumps, Hydronic System Design, Cooling, Pumps, Chilled Water

We received an interesting question this week from a consultant engineer: “How much temperature increase will I get in the chilled water from the pump? My secondary chilled water pump has a capacity of 1400 GPM at 100 feet” Let’s look at the answer. ANSWER: Centrifugal pumps in hydronic systems do the work of moving gallons per minute of fluid against a differential head in feet. This work is defined as Brake Horsepower (BHP) also expressed in equation 1. [Read more…]