Minimum Flow in Variable Speed Pumps for Building Hydronic HVAC Systems (Part 2)

Norm Hall Hydronic Design, Monday Morning Minutes, Piping and Installation, Primary Variable, Pumps, Selection & Specification, 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, …

ASHRAE 90.1-2013
ASHRAE 90.1-2013

Variable Speed Chilled Water Systems: Demand Reset

Norm Hall ASHRAE 90.1, Codes & Standards, Michigan Energy Code, Monday Morning Minutes, 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 …

Selecting Constant Speed Cooling Tower Pumps & Balance Valves with Multiple Condensers

Norm Hall Controls, Cooling Tower, Cooling Towers, Monday Morning Minutes, Piping & Pumps, Variable Speed, Variable Speed Pumps

It is important to check the single pump operation when selecting parallel pumps for multiple constant speed cooling tower pumps. In the last R. L. …