Surface Calorimeters


Climatic Testing Systems, Inc. (CTS) designs and manufactures a complete line of Surface Calorimeters for automotive and commercial air-conditioning applications in accordance with ASHRAE Standard 33.

Surface Calorimeters are used to determine the capacities of components such as:

  • Evaporators
  • Condensers
  • Radiators
  • Heater Cores
  • Oil Coolers
  • Charge Air Coolers
  • Tube Surfaces
  • Chilled Water Coils

Our Surface Calorimeters are designed to provide extreme accuracy, repeatability and flexibility in the determination of heat exchanger thermal capacities.

CTS Surface Calorimeter systems feature temperature controlled chambers for the control of the air temperature over the heat exchangers. These conditions are precisely controlled and recorded.  CTS uses Code Test Tunnels to determine system air flows and the psychrometric conditions of the air as it leaves the test piece. Our Code Test Tunnels include AMCA nozzles with either manual or automatic selection of the required nozzles. Our Tunnels are designed with a bypass system to allow a wide range of system air flows without sacrificing system accuracy. Various refrigerant types such as R-12, R134a, R404a, R407C, R410a, R507, R600a and others can be tested.

Ambient Chamber TemperatureAmbient +5°F to 250°F± 0.5°F
Ambient Dew Point35 to 135°F± 0.2°F
Discharge Pressure150 to 500 Psig±2.5 Psig
Suction Temperature0 to 100 Psig±0.5 Psig
Liquid Temperature60 to 210°F± 0.2°F
Air Flow500 to 15,000 CFM ± 1%
Glycol Flow0 to 12 GPM±0.2 GPM ± 0.75 GPM
Glycol Temperature60 to 230°F±0.2°F
  • 2% agreement or better heat balance air-side to refrigerant side
  • 1% repeatability of test results
  • Editing of test program
  • Automatic test sequencing
  • Loop calibration and calibration reports
  • Hardware checkout routine
  • Stability monitoring
  • Real-time tolerance adjustments
  • Real-time history graphing capability
  • Automatic test report generation
  • Data file management
  • Oil in circulation control
  • Auxiliary evaporator systems
  • D.C. blower controls
  • Passenger Car & Truck: up to 6 tons
  • Bus and Van: up to 20 tons
  • Commercial Air-Conditioning: up to 20 tons