Energy Efficiency Benefits of Variable Refrigerant Flow Technology

06:00 PM - 07:00 PM
Harshal Upadhye, EPRI, Knoxville
International Building Performance Simulation Association,
East Tennessee Chapter, Kickoff Meeting
Hibachi Grill and Supreme Buffet, 9645 Kingston Pike, Knoxville
Email: Jibo Sanyal

A variable refrigerant flow (VRF) system is a direct expansion (DX) heat pump technology utilizing vapor compression cycle which is thermodynamically similar to unitary and other common DX systems.   In a conventional heat pump system, the refrigerant flow rate cannot be modulated by the compressor which runs at a fixed speed.  This results in an ON-OFF type control where the system provides more than necessary cooling or heating during the ON cycle and zero cooling or heating in OFF cycle.  VRF systems utilize variable speed compressors to modulate refrigerant flow through each indoor unit so that exact capacity can be delivered to each indoor unit.  Variable speed compressors can slow down in case of reduced load on the system or speed up if there is higher load.  Very little independent VRF-HR (heat recovery) system performance data is available to validate the energy efficiency claims.  EPRI with its utility partners provided VRF-HR system lab-test, performance-data, intended to improve building simulation model capability to estimate VRF-HR system energy use.  The talk will focus on EPRI's VRF lab testing efforts, field monitoring activities and modeling.

About the Speaker:

Harshal Upadhye is a Project Manager in the Power Delivery and Utilization Sector at EPRI. He joined EPRI in October 2010 as a Sr. Engineer responsible for laboratory performance mapping of Variable Refrigerant Flow systems.  Mr. Upadhye leads and manages EPRI's end-use thermal energy storage efforts.  His current activities include assessing thermal energy storage capabilities of water heaters and air conditioning systems. Prior to joining EPRI Harshal has worked on product development in the HVAC field (Heating Ventilation and Air Conditioning) with Delphi in their Thermal and Interior division and with Danfoss in their Commercial Compressors division.   At Danfoss, Harshal was one of the first engineers to work on their variable speed scroll compressors. Harshal holds patents and has pending applications related to scroll compressor technologies. Harshal has a B.S. in Mechanical Engineering from University of Pune, India in 2002, an M.S. in Thermal and Fluids in 2004 from the Rochester Institute of Technology, Rochester, NY. Harshal is an associate member of ASHRAE.

NOTE: Dinner is optional ($10).


RSVP: Jibo Sanyal, 865.241.5388


More Information:IBSPA



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