Optimization Design of Actuator Parameters in Multistage Reciprocating Compressor Stepless Capacity Control System Based on NSGA-II

Table 4

Reciprocating compressor parameters.

Parameter	Value	Unit	Parameter	Value	Unit
Crank radius	0.09	m	Crank radius-connecting rod length ratio	0.2
Connecting rod length	0.45	m	Valve mass	0.05	kg
Diameter of piston rod	0.045	m	Motor speed	500	r.min^−1
Diameter of piston	0.25	m	Number of similar valves	2
Head end clearance volume	1.26E-03	m^3	Flow coefficients of valve gap	0.7
Crank end clearance volume	1.22E-03	m^3	Suction temperature	27	°C
First-stage suction pressure	100	kPa	Precompression amount of spring	0.004	m
First-stage discharge pressure	180	kPa	Valve lift	0.0021	m
Second-stage discharge pressure	300	kPa	Gas constant	287	m^2.sec^−2˙k^−1
Adiabatic exponent	1.4		Sum of valve seat’s ring perimeter	0.59	m
Valve seat flow area	0.0043	m^2	Suction temperature	27	°C
Valve seat outlet area	0.0043	m^2	Discharge temperature	70	°C
Seat compression area	0.0043	m^2	Total stiffness	8000	N.m^−1