For fan-powered terminal
units, the fans are often driven by fractional horsepower motors with the fan and motor being evaluated as a single unit.
When modeling an HVAC system using series fan-powered terminal
units (FPTUs) with permanent split capacitor motors in EnergyPlus, the user must enter values for fan total pressure rise and fan/motor efficiency.
While the primary objective of the project was to develop performance models of series and parallel fan-powered terminal
units used in variable air volume (VAV) systems, the results with the fractional horsepower motors can also be applied to unitary air conditioners, heat pumps and furnaces.
If the terminal unit has a fan in it, it is called a fan-powered terminal
This is the second in a series summarizing the results and implications from a series of ASHRAE, Air Conditioning, Heating and Refrigeration Institute (AHRI), and industry-funded research projects conducted over the past 14 years on fan-powered terminal
Terminal units containing a fan are called fan-powered terminal
Both play into the use of variable volume fan-powered terminal
units, and the studies we will be describing here will show how significant energy savings can be documented as well.
Electronically commutated motors (ECMs) are increasingly being used as the motors of choice to drive the fans in fan-powered terminal
One component whose viability is improved by ECMs is the parallel-flow fan-powered terminal
A common designation for terminal units with internal fans is fan-powered terminal
units or FPTUs.
Performance of series fan-powered terminal
units with electronically commutated motors.
units have been a key component of many building HVAC systems over the years, as they are largely responsible for helping move air through a building to occupant spaces.