Over the last few weeks the Monday Morning Minutes posts have looked at pumping issues with multiple condensers and pumps. One of our most-received questions …
Parallel Pumping in Condenser Applications: Automatic Differential Pressure Control (Part 3)
Chilled water condensers are normally operated as constant-flow devices and the pumps serving them are constant-speed. Why would you ever use a variable-speed drive for …
Parallel Pumping in Condenser Applications: Limiting the Flow Rate (Part 2)
In part 1 of this series we offered an example condenser water pumping system. The design of this example is 800 GPM per condenser for a …
Parallel Pumping in Condenser Applications (Part 1)
Applying a single constant-speed pump for each condenser in a chilled water application is a normal design for the HVAC engineer. The chiller manufacturers suggest …
Hydronic Expansion Joints (Part 2): It’s All About the Guides
Expansion joints in hydronic systems are used when the natural flexibility of the pipe will not handle the calculated movement caused by thermal expansion. Those joints could …
Hydronic Expansion Joints (Part 1)
Piping flexible connectors for pumps, chiller, towers, and other equipment are often described in two different sections of the mechanical specifications for new and retrofit …
Hydronic Expansion Joints: Flexible Connectors vs. Expansion Joints
William Shakespeare may not have known anything about hydronic engineering, but a small part of his play, Romeo and Juliet, could be renamed Flexible Connectors and Expansion …
Hydronic Pump Piping and Trim: Rubber Flexible Connectors
This week we look at rubber flexible connectors and compare. The first thing the reader will notice in the photo are the words “expansion joints” …
Hydronic Pump Piping and Trim: Why Use Flexible Connectors?
The R. L. Deppmann Monday Morning Minutes will look at near pump piping over the next several weeks. This week, we want to spend some …
Sizing Pressure Relief Valves for Closed Chilled Water Systems
Pressure relief valve sizing for heating systems is well documented by ASHRAE, boiler codes, and product manufacturers such as Bell & Gossett. Relief valve sizing …