Plastic Deformations of Discharge Valves in Hermetic Compressors

Discharge Gas Temperature Control in Reciprocating Hermetic Compressors Modified for R134a/R22 Refrigerants Operation as Substitutes of Present R12/R502

Discharge gas temperature value is an indicator of compressor safe operating conditions, particularly on R12 and R502 commercial applications. These refrigerants will be replaced very soon by R134a and R22 respectively, also if R22 is not considered a final solution. High discharge temperatures are typical in LBP-R22 hermetic compressors operating at low evaporating temperature as low as -40"C;...

Parametric Study of Hermetic Reciprocating Compressor

A numerical simulation of the thermal and fluid-dynamic behaviour of hermetic reciprocating compressors has been developed by solving the one-dimensional and transient governing equations of the flow (continuity, momentum and energy) in the whole compressor domain. The governing equations are discretized using an implicit control-volume formulation. A SIMPLE-like algorithm, extended to compress...

Dynamic Transfer Stiffness of Suspension Springs and Discharge Tubes in Hermetic Reciprocating Compressors

Numerical Study and Experimental Comparison of CO2 Reciprocating Compressors for Small Cooling and/or Freezing Capacity Applications

The present paper is a numerical and experimental comparative study of hermetic and semi-hermetic reciprocating compressors working with carbon dioxide as fluid refrigerant against the conventional R134a hermetic compressors. When cooling conditions for one-stage compressor type (i.e., evaporation temperatures between 7.2oC and –10oC) have been considered, the numerical and experimental results...

Stress Analysis of Suspension Springs and Discharge Loop Under Impact Conditions for Hermetic Compressors Using FEM

The transport worthiness of suspension springs and discharge lo0p in hermetic compressors under impact conditions has been analysed by analytical and computational simulation. The equations represent static behaviour to consider the maximum stresses arising from the impact loads. The problem is divided into two parts. The discharge loop is analysed by linear one-dimensional finite elements in 3...