Presentation Profile
Precision Air Conditioning in Octane Testing: New Developments in Automating Humidity and Temperature Control for Enhanced RON/MON
Currently Scheduled: 10/14/2026 - 1:00 PM - 2:00 PM
Room: Exhibit Hall Entrance
Main Author
Raj Shah - Koehler Instrument Company, Inc.
- Lei Andre Delos Reyes - Koehler Instrument Company, Inc.
Abstract:
Accurate octane rating of spark-ignition engine fuels relies heavily on the precise control of environmental variables during testing. Variations in intake air temperature and humidity can significantly skew Research and Motor Octane Number (RON/MON) determinations, leading to inconsistent fuel quality assessments and downstream operational inefficiencies. To mitigate these risks, advanced air conditioning systems have been developed to deliver precise, automated environmental control in accordance with stringent standards. This poster presents recent advancements in intake air conditioning for octane test engines, exploring the functionality and application of the Koehler K90900-A Air Humidity Cabinet. The system utilizes a tube-and-fin cooling exchanger and a refrigerated ethylene glycol circulating loop to dehumidify and chill intake air to a constant 25–50 grains of moisture per pound of dry air, strictly conforming to ASTM D2699, ASTM D2700, and ASTM D2885 specifications. Furthermore, the unit features an integrated coolant circulation system connected via quick-couplings dedicated to chilling the carburetor and fuel bowl, ensuring critical thermal stability of the fuel sample during evaluation. Maintaining these exact atmospheric and thermal conditions provides the fundamental consistency required for accurate and reproducible octane ratings. The integration of automated, real-time monitored air control instrumentation with standard testing protocols streamlines laboratory workflows and replaces traditional ice towers. These advancements are driving greater precision in fuel quality control, contributing to optimized engine performance and highly reliable refinery operations.
