Featured image for “Hydronic System Design – High Delta T Can Improve Boiler Efficiency (Part 2 of 4)”
Norm Hall
 / 
February 7, 2022
Boilers
, 
Condensing
, 
Hydronic system design
, 
Monday Morning Minutes
, 
Primary secondary piping
, 
Selection & specification
, 
Temperature control
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... READ MORE
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Featured image for “Ice Rink Cooling System – Commissioning the Glycol Expansion Tank”
Norm Hall
 / 
November 29, 2021
Chilled Water
, 
Expansion tanks
, 
Expansion/compression tank
, 
Glycols
, 
Hydronic system design
, 
Monday Morning Minutes
A customer recently called us about an unusual occurrence in a closed hydronic cooling system for an ice rink. The system was filled using a... READ MORE
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Featured image for “Constant Speed 2-Way Control vs. Variable Speed Pumps for Heating and Cooling Coils (Part 2)”
Norm Hall
 / 
November 22, 2021
Coils
, 
Hydronic system design
, 
Monday Morning Minutes
, 
Primary secondary piping
, 
Temperature control
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... READ MORE
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Featured image for “Constant Speed 2-Way Control vs. Variable Speed Pumps for Heating and Cooling Coils (Part 1)”
Norm Hall
 / 
November 15, 2021
Coils
, 
Hydronic system design
, 
Monday Morning Minutes
, 
Primary secondary piping
, 
Temperature control
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... READ MORE
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Featured image for “Hydronic Primary-Secondary Piping – How Important are the Two Close Tees?”
Norm Hall
 / 
November 8, 2021
Hydronic system design
, 
Monday Morning Minutes
, 
Primary secondary piping
, 
Terms
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... READ MORE
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Featured image for “Solving Minimum Flow in a Primary Variable System (Part 3)”
Norm Hall
 / 
October 11, 2021
Hydronic system design
, 
Minimum flow
, 
Minimum flow
, 
Monday Morning Minutes
, 
Primary variable
, 
Pumps
The engineer is aware of the importance of minimum flow to the pumps in hydronic systems. The R. L. Deppmann Monday Morning Minutes Part 1... READ MORE
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Featured image for “Minimum Flow in Variable Speed Pumps for Building Hydronic HVAC Systems (Part 2)”
Norm Hall
 / 
October 4, 2021
Hydronic system design
, 
Minimum flow
, 
Minimum flow
, 
Minimum flow
, 
Monday Morning Minutes
, 
Primary secondary
, 
Pumps
, 
Variable Speed
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,... READ MORE
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Featured image for “Variable Speed Chilled Water Systems: Demand Reset”
Norm Hall
 / 
June 21, 2021
Codes and Standards
, 
Control
, 
Cooling
, 
Energy
, 
Hydronic system design
, 
Monday Morning Minutes
, 
Pumps
, 
Pumps
, 
Variable Speed
There are multiple methods to vary pump speed in HVAC chilled water systems. A common method is the use of a differential pressure transmitter at... READ MORE
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Featured image for “Cooling Tower Spring Startup Tips”
Norm Hall
 / 
April 19, 2021
Cooling
, 
Cooling towers
, 
Hydronic system design
, 
Monday Morning Minutes
The weather is warming, and our attention turns away from heating and toward system air conditioning. To protect the cooling tower pumps, we offer a... READ MORE
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Featured image for “Tis’ the Season to Start Your Air-Cooled Chillers”
Norm Hall
 / 
April 12, 2021
Cooling
, 
Hydronic system design
, 
Monday Morning Minutes
Many air-cooled chillers do not have glycol and are drained for the winter season. Most cooling towers are also drained for our cold winter months.... READ MORE
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