A/C System Calorimeters

Climatic Testing Systems, Inc.’s A/C System Calorimeters are designed to provide the customer with extreme accuracy, repeatability and flexibility in the determination of automotive air conditioning system thermal capacities.

The CTS System Calorimeter is designed to simulate all of the spaces in and around a vehicle under extreme operating conditions. The system calorimeters utilize up to three (3) Walk-In Chambers for the control of ambient conditions for the condenser and evaporator(s)/heater core(s) and one (1) Reach-In Chamber for the control of ambient conditions around the compressor. These ambient conditions are precisely controlled and recorded.

Air Enthalpy Tunnels are used to determine system air-flows and the psychrometric conditions of the air as it exits the test piece. The code testers include AMCA nozzles with a bypass system to allow a wide range of system air-flows without sacrificing system accuracy. The calorimeter offers control over such parameters as ambient temperature and humidity, test piece air flow, compressor speed, discharge pressure, condenser inlet temperature, expansion device inlet temperature, suction temperature, heater core inlet temperature, pressures and flows, etc. The calorimeter is controlled by an automated computer data acquisition and control system and is designed for heat balances of  ±2% with a repeatability of ±1%.

Compressor Chamber TemperatureAmbient +5°F to 250°F ± 0.5°F
Compressor Speed 400 to 6000 RPM ± 5 RPM
Discharge Pressure 150 to 5000 Psig ± 2.5 Psig
Suction Pressure 0 to 100 Psig ± 0.5 Psig
Liquid Temperature 60 to 210°F ±0.2°F
Evaporator Core Air Flow 50 to 1500 cfm ± 1%
Condenser Air Flow 500 to 5000 cfm± 1%
Condenser Room Temperature 40 to 140°F± 0.2°F
Evaporator Room Temperature 15 to 140°F± 0.2°F
Evaporator Room Dew Point Evaporator Room Dew Point 35 to 135°F± 0.2°F
Glycol Flow0 to 12 GPM± 0.2 GPM ± 0.75 GPM
Glycol Temperature 60 to 230°F± 0.2°F
  • > 2% agreement or better heat balance air-side to refrigerant side
  • > 1% repeatability of test results
  • Passenger Car & Truck: up to 6 tons
  • Bus and Van: up to 20 tons
  • 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