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SunTrac & Toshiba

Full Operation Test Report: VRF System with Panel vs. without Panel

(Toshiba 10-Ton HP-A/C w/DC Inverted Compressors, Saigon, Vietnam, March 2015)

Result #1 – The SunTrac Panel adds substantial thermodynamic heat to the “hot gas”

of the VRF system

The typical results are displayed on the graphic shown in the report photos.  When the

refrigerant was passed through the SunTrac panel, the temperature rise was typically

measured at between 8 – 10C.

Result #2 – The addition of solar thermal energy to the refrigerant system causes the VRF compressor to unload and create substantial, measurable savings 

From repeated cycles of measurement, the “average” measured power was approximately 2.6 – 2.65KW, or a measured power reduction of 50%.  These results were measured over a total of 5 testing cycles during the day.

Result #3 – NO modifications were necessary to the Toshiba Control System

It was determined that the Toshiba unit’s inherent control system modulated the compressor from near full load to a substantially reduced load using the existing, internal control system.

Toshiba 10-Ton HP-A/C w/DC Inverted Compressors, Saigon, Vietnam  March 2015

This test was conducted by:

 Tien Nguyen, Managing Director – Green Energy Engineering & Trading Co. (GEE), Saigon, Vietnam

Mr. Nguyen is a graduate of Van Lang University in Ho Chi Minh City with a Bachelor´s Degree in Applied HVAC Technologies with a sub-specialty in Heat Transfer applications.  He spent seven years with Johnson Controls Vietnam in successive roles as field engineer, applications engineer, project manager and sales engineer before leaving Johnson Controls to found his own company.


Note: The complete white paper is available upon request.

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