The unit is a combination of fan test and heat transfer technics. Heat from circulating hot water is exchanged to an air flow. This provides wide thermodynamical investigations:

• Radial fan characteristics
• Radial fan efficiencies
• Characteristics of a circulating pump
• Heat exchange efficiencies

Properties:

• Centrifugal 4-speed waterpump
• 3-kW electric heater with on/off control
• Iris air flow restrictor

Measuring systems:

The measuring devices are digitally connected to the internal controller, sending serial data to the comprised portable PC. Stand control and data acquisition is performed by Windows-software. Measured quantities are:

• Torque and speed of the motor
• Water flow-rate
• Pressures
• Pitot static tube in the air duct for pressures and flowrate measurement

Technical details:

See also Building automation test-stand which is an extension of this unit.