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HVAC&R equipment manufacturers are evaluating system designs to accommodate the next generation of lower GWP refrigerants and comply with higher efficiency requirements. Revised heat exchanger designs, including tube fin and microchannel, are being implemented. Each has unique characteristics from the manufacturing process to allow for residual process chemicals. Process chemical variations are being investigated to be compatible and miscible with lower GWP refrigerants and revised equipment designs. Collaboration among industry experts will examine what is required to maintain effective system reliability whilesatisfying environmental and efficiency regulations.

1. Microchannel Heat Exchangers: Which Manufacturing Issues Can Lead to Contamination of the HVACSystem?Bill Morton, Member, Circle-Prosco, Inc., Bloomington, IN

2. Metalworking Fluid Compatibility and Miscibility with Low GWP Refrigerants Compared to LegacyRefrigerantsCasey Scruggs, Associate Member, Metalloid Corporation, Jacksonville, TX