The document discusses research on using minichannel heat exchangers to reduce refrigerant charge in HVAC&R systems. Minichannel heat exchangers can minimize refrigerant charge without loss of performance. Experimental results show that minichannel condensers can reduce refrigerant charge by 65% compared to brazed plate heat exchangers. Systems using minichannel heat exchangers have been demonstrated to achieve refrigerant charges as low as 30 g/kW for propane refrigerant. The research aims to better understand heat transfer in minichannels to inform design of low charge systems.