Abstract
In this numerical study, the temperature, pressure and flow structure inside the rotary compressor are obtained to analyze the work consumption and efficiency. The geometry of the compressor such as volume, inlet angle, and mass of reed valve are varied to look for optimal performance and design margin as the suggestions for manufacturing. The work done on refrigerant increases proportionally with the volume of the compressor. However, there is an optimal volume for efficiency. The design margin for inlet angle is determined. The best efficiency exists in a specific inlet angle. Larger mass of reed valve leads to the increase of input power due to the additional resistance from greater inertia, which causes a decrease of efficiency. The flow visualization by simulation diagnoses the potential factors, which may cause noise problem.
Highlights
The experimental methods for compressors usually only provide the thermodynamic properties such as the discharge pressure, temperature, or enthalpy difference between inlet and outlet, and work, etc
The inlet angle of compressor and mass of reed valve are varied substantially to investigate the effects on efficiency and the design margins of rolling piston type of rotary compressor
The inlet angle affects the overshoot of rated pressure slightly, as shown in Figure 14b, the opening angle of reed valve decreases as the inlet angle of compressor increases
Summary
The experimental methods for compressors usually only provide the thermodynamic properties such as the discharge pressure, temperature, or enthalpy difference between inlet and outlet, and work, etc. Ishii et al [3] theoretically studied the optimal mechanical efficiency by using many combinations of major dimensions that yield a rolling piston rotary compressor with the same suction volume. The results show the optimal mechanical efficiency exists in a specific radius of piston and its corresponding depth of cylinder in each suction volume In their studies, at least two parameters are changed. In this study, only one parameter, the radius of piston, is changed with constant radius and depth of cylinder to determine the volume effect on efficiency Other major dimensions, such as slenderness ratio (H/D), which is the ratio of the depth of cylinder to the diameter of cylinder, affect the mechanical efficiency. The inlet angle of compressor and mass of reed valve are varied substantially to investigate the effects on efficiency and the design margins of rolling piston type of rotary compressor
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