Resulting selection criteria or measures

• Identical dimensions of the liquid line such as for R22 (higher liquid volume flow, but lower pressure drop due to lower density), Liquid volume flow of various refrigerants compared with R290 at identical refrigerating capacities.
• Potential for minimum refrigerant charge (mass approx. 40-60% compared with fluorinated refrigerants) – due to lower liquid density and the option of reduced cross-sections in heat exchangers, suction gas and discharge gas lines.
• Adjust heat exchangers (e.g. evaporators, injection distributors, pipe length and pipe geometry) and fittings to the mass and volume ratios.
• For thermostatic expansion valves, use designs for R290 or R1270.
• For increased suction gas superheat at the compressor inlet, install an internal heat exchanger between the liquid line and the suction gas line.
• Advantages in terms of performance, coefficient of performance (COP) and reduced refrigerant concentration in the oil are achieved due to higher allowable temperatures.
• For reciprocating compressors, the discharge gas temperature must be at least 20 K and for compact screw compressors 30 K above the condensing temperature.

• Due to the high critical temperature, R290 is equally suitable for use at higher condensing temperatures as R22 – better than R404A/R507A, R407A/F or R410A.

• Due to the high critical temperature, R1270 is more suitable for use at higher condensing temperatures than R404A/R507A, R407A/F or R410A, but not as suitable as R22 or R290. The higher discharge gas temperature may also lead to restrictions in this case.