Many facilities require cooling during the cold winter months. Northern climates such as Michigan or Ohio may not have any latent load in the cold …
Existing Hydronic System Volume Calculations
During a recent visit to a K-12 school hydronic system, I was asked if there was a way to determine the total system volume. My tongue …
Parallel Pumping with Unequal Condensers (Part 4)
Over the last few weeks our Monday Morning Minutes posts have looked at pumping issues with parallel, equal-sized condensers and pumps. This week we will look …
Where Cavitation Begins – Cooling Tower Pumps and Piping
Last week the R. L. Deppmann Monday Morning Minute defined NPSHR, and ended with the Hydraulic Institute (HI) definition as the absolute pressure that will cause the total head of the pump to be reduced by 3%, due to flow blockage from cavitation”. Of importance is the fact that it does not say that NPSHR is where cavitation begins.
Differences in Compression Tank and Expansion Tank Formula – Part 9
Now we understand the difference between expansion and compression tanks as described in the R. L. Deppmann Monday Morning Minutes of 1-9-12 and 1-16-12. What happens to the formula results when comparing these two types of tanks? In part 1 of this series, we introduced the formula for tank sizing. The denominator of the equation was: (Pa /Pf) – (Pa /Po)
The Bell and Gossett System Syzer® – a few other uses
The ITT Bell and Gossett system syzer has a scale 5 which may be used to determine pressure drop in a hydronic system when the …
Primary-Secondary Systems with Different DeltaT
Condensing boilers become more efficient as the return water temperature becomes lower. To make the most of this investment in condensing boiler technology, the system …
Condensing Boiler Piping – Part 1
Over the next several weeks, the Monday Morning Minute articles will focus on the piping side of boiler and water heater layout. We will focus …