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, …
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 …
Hydronic System Design – High Delta T Can Improve Boiler Efficiency (Part 2 of 4)
How can you increase the operating efficiency of your condensing boiler heating system? This question was raised in the last R. L. Deppmann Monday Morning …
Constant Speed 2-Way Control vs. Variable Speed Pumps for Heating and Cooling Coils (Part 2)
An engineer asked a question about using a variable speed pump for air temperature control in lieu of a two-way control valve. What are the …
Constant Speed 2-Way Control vs. Variable Speed Pumps for Heating and Cooling Coils (Part 1)
An engineer asked a question about using variable speed pumps for air temperature control in lieu of a two-way control valve. The question clearly makes you …
Hydronic Primary-Secondary Piping – How Important are the Two Close Tees?
Every year we get questions about the importance of primary-secondary piping rules around boilers and coils. Recently, I also received a call about using a …
Minimum Flow in Variable Speed Pumps for Building Hydronic HVAC Systems (Part 2)
The HVAC engineer designing a hydronic system understands the need to protect the circulating pumps from a dead head or no flow condition. This week, …
Hydronic Heating Buffer Tanks – Part 3 – Variable Primary
Hydronic heating system buffer tanks requirements and sizing were addressed in parts 1 & 2 of this short series. I received a couple of questions …
Hydronic Heating Buffer Tanks Part 2 – Sizing
Hydronic heating system buffer tanks are used to add water volume to the system to help avoid excessive cycling of the boiler. How do you …
Hydronic Heating Buffer Tanks – Part 1 – Location
We know that cycling a hydronic condensing boiler on and off too often will waste energy. There are other problems caused by a boiler cycling …