Adjustable Pressure Package with Chiller for Aerospace Material Testing


In this interesting application, our customer is testing the heat resistance of materials used in airplanes.  Cold air is pumped into the bottom of a test chamber while the materials are heated in the center of the chamber.  As the air leaves through the top of the chamber, the temperature difference between the air at the inlet and the discharge indicates how much heat is absorbed by the material. The project had two major requirements:

Constant adjustable airflow

The customer needed the ability to adjust the airflow and pressure entering the test chamber.  Positive displacement blowers create a pulse as the air is pushed through the blower so we included a series of discharge silencers that reduce the pulses until the airflow only fluctuates +/- 0.1 psi.  A VFD allows the user to adjust the airflow to the desired level as needed.

Adjustable air temperature

The second requirement was the ability to set the temperature of the cool air entering the bottom of the test chamber.  A chiller was included on the skid so air leaving the blower–which is typically around 180 F–can be cooled to the desired temperature before it reaches the chamber.

Package Specifications

  • Roots 33 URAI Positive Displacement Rotary Blower
  • VersaBase 023 with Integral Belt Guard and associated brackets for accessory mounting
    • Isolator Pads included between VersaBase and Steel Sub-Base to reduce vibration and noise
  • Motor, 5 HP, TEFC, Premium Efficiency, 1800 RPM, 1.15 SF, 230/460V (Usable on 208V), 3 Phase 60 Hz
  • Wall Mount VFD Panel:
    • EQ7-2005-C VFD – (Usable on 208V)
    • UL489 main Breaker
    • Overload
    • Contactor
    • 30MM H-O-A
    • 30MM LED Red Light
    • 30MM LED Green Light
    • 480VAC ver – control trans
    • UL489 control breaker
    • 30′ remote mount cable (without connectors)
  • Motor Slide Base, Double Adjusting
  • Drive, V-Belt, minimum service factor of 1.4
  • Inlet Filter, 2″, Paper Element, Universal CCF-2
  • Inlet Silencer, 2″, Chamber-Absorptive Type, Universal SD-2
  • (2) Discharge Silencers, 2″, Chamber-Absorptive Type, Universal SD-2
  • Discharge Flex Connector, 2″, Silicone Impregnated Fiberglass
  • Relief Valve, Pressure, Spring Type, Kunkle 337. 2″, Set at 6 PSI
  • Check Valve, 2″ MNPT, EPDM Seal
  • Pressure Gauge, 2.5″ Dia., 0-15 PSI, Liquid Filled, Snubber & Gauge Cock
  • Differential Pressure Gauge, 0-20″ WC, Dwyer 2020
  • Orifice Plate – per customer specs
  • Fabricated Steel Sub-base for common mounting of package, chiller, and heat exchanger, Forklift Slots
  • Water Separator
  • Water to Air Shell & Tube style Heat Exchanger
    • Air discharge between 70 – 75 deg F
    • Capacity is 8,900 BTU’s/Hr at rated conditions
    • Fluid Circulated: 35/65 Glycol/Water
  • Fluid Chiller
    • Stand alone air cooled chiller with integrated pump and tank system
    • Pump capacity rate of 4gpm @ 50 psi
    • Comes standard with Ranco microprocessor temperature controller with LED display
    • Capacity is 18,000 BTU’s/Hr at rated conditions
    • Factory set point of 70°F (adjustable)
    • 230V-1ph/460V-3ph (Usable on 208V-1ph)
  • Booster Fan (The customer wanted to run duct work from the cooling air vents on the chiller up to the ceiling. The booster fan was installed in the attic, ensuring the air wasn’t restricted by the additional duct work.)
    • 1300 CFM at up to 0.8″ WG
    • 230 VAC / 1 Ph / 60 Hz
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