David R. Tree

David R. Tree is a professor, mechanical engineering, Purdue University, West Lafayette, Ind. His research has resulted in development of models for capillary tubes, frost formation on heat pump heat exchangers and transient behavior of unitary air conditioners and heat pumps, rating procedures for HVAC&R equipment and analysis of compressor noise. His early research on modeling of capillary-suction line heat exchanger systems is still referenced in the ASHRAE Handbook. Tree and his graduate students were the first to report in technical literature the pressure measurements in a capillary tube where the flash point did not occur at the location of the pressure measurement location. Other research still used is the rating of solenoid values for refrigeration systems using experimental data from air and water tests.  He helped organize the first International Compressor Conference and the International Refrigeration and Air Conditioning Conference at Purdue.