Norske lysark 2001

1
(Title of poster) Example A New Heat Pump
Dryer (Authors names) Example Trygve M. Eikevik
and Odilio Alves-Filho (Simple Affiliation)
Example Norwegian University of Science and
Technology (NTNU)
CONCLUSIONS There have been installed a new fluid
bed dryer in the dewatering laboratory at NTNU
and SINTEF with CO2 as refrigerant. The plant is
designed to operate at a temperature range from
-20oC to 90oC. This gives operating conditions
for the heat pump far out from the design point.
The oversized fan reduces the COP for the
process. The SMER values for the plant have been
measured from 1.65 to 3.73 at different drying
air temperatures.

• Drying temperatures
• -20oC to 90oC
• Air flow
• 100-800m3/h
• Fluid bed diameter
• 10-35cm
• CIP- washing system
• Steam sterilisation

Table I. Results from the tests performed on the
CO2 heat pump

• Heat pump modes
• Subcritical
• Transcritical
• Supercritical

High pressure regulation gives optimal COP
Air cooling capacity almost equal over
temperature range