Using a stronger compressor is the best way to maintain refrigerant velocity in a refrigeration system. This enhances pressure and flow rate, leading to improved efficiency. Altering line sizes may not effectively achieve the desired outcome. ;
The best way to keep refrigerant velocity up is to use a stronger compressor, as this enhances pressure and flow rate. Other options, like line size adjustments or increased lubrication, do not effectively maintain refrigerant velocity. Therefore, the correct choice is option (a) use a stronger compressor.
;