Many boilers manufacturers recommend or suggest using a primary secondary arrangement rather than primary variable pumping. Often this piping scheme is suggested to avoid flow …
Primary Secondary Piping Basics: Part 2 – The Common Pipe (also Referred to as the Decoupler)
R. L. Deppmann Company receives calls about the size and the length of the common pipe just about every week. Gil Carlson, ASHRAE fellow and …
Primary Secondary Piping Basics: Part 1 – Terms
The basic design concepts of piping are important for a properly operating hydronic heating or cooling system. We have a great number of new engineers, …
Chilled Water Coil Temperature Reset in Cold Winter Months
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 …
Primary-Secondary CHW Loops with Unequal Flow Rates
Primary-secondary hydronic system loops have a common pipe that facilitates flow in both directions when the two loops have different flow rates. That same common …
Water Side Economizers Part 11: Summary of Design Thoughts
We can conclude the series on waterside economizers with a summary of suggestions for the engineer to consider. ASHRAE 90.1 Energy Standards require this energy-saving …
Water Side Economizers Part 10: Heat Exchanger Fouling & Maintenance
Waterside economizer heat exchanger fouling can lead to significant operational cost for the owner of the commercial chilled water system. The water side economizer system …
Water Side Economizers Part 9: Heat Exchanger Pressure Drop
The water side economizer pressure drop is an important point for the engineer to consider. The ASHRAE 90.1-2013 energy standard requires the pressure drop of …
Water Side Economizers Part 8: The Heat Exchanger Approach
The gasketed plate heat exchanger and the capacities it should be scheduled at is the subject of today’s blog. The first seven parts of this …
Waterside Economizers Part 7: Tower Side Temperatures
The waterside economizer is normally a gasketed plate heat exchanger. There is chilled water on one side and cooling tower water on the other side …