I recently visited a school mechanical room and was asked about the relationship between the makeup pressure reducing valve setting and the expansion tank pressure …
Condensing Boilers and Air Handing Unit (AHU): Hydronic Hot Water Coil Return Temperature
Correction to my 8-26-19 blog. In the rush to get on vacation I messed up on my math. This is corrected. Thank you to Tom …
Domestic Water Heaters: Plate Heat Exchangers and Dual Return Condensing Boilers
Gas-fired storage type domestic water heaters are the norm in commercial and institutional buildings. Walk into any mechanical room of a larger complex and you …
Hydronic Primary/Secondary Heating-Cooling (Chiller) Changeover Systems
Once in a while, we still see the two pipe heating or cooling system with a manual or automatic changeover process that the owner uses …
Condensing Boilers and Air Handling Units (AHU): Hydronic Hot Water Coil Return Temperature
Hydronic system hot water coils in air handling units often have secondary pumps for freeze protection. The hot water coils usually have design temperatures that …
Hydronic Radiant System Secondary Temperature Control Using “The Law of the Tee”
Primary-Secondary hydronic piping is a common piping scheme in today’s hydronic heating and cooling systems. This article will show you how to use this common …
Hydronic System Primary-Secondary Rules-Decoupling Systems
Primary-Secondary (P-S) hydronic piping is a common piping scheme in today’s hydronic heating and cooling systems. This short series of blogs will provide examples of piping schemes which will support the reduction of hot water return temperatures to enhance the value of condensing boilers. The first article will just review the rules of the road in P-S piping.
“Top 6” Dual Return Condensing Boiler Opportunities for Enhanced Savings
Dual return condensing boilers can enhance the efficiency of your heating plant by 3-6%. How can an HVAC and Plumbing engineers design the system to …
Balancing HVAC Hydronic Systems Part 3: Flow Measurement Valves
The flow balance of a hydronic system is a critical component in the commissioning of an HVAC hydronic system. The common balance and flow measurement …
Balancing HVAC Hydronic Systems Part 2: Control Valves vs. Balance Valves
There are some engineers who challenge the use of balancing valves at all in hydronic systems. If the control valve throttles the flow to satisfy …