Prediction of pressure pulsation magnitude and their harmonic components for a multistage reciprocating compressor, piping and reservoir system depends on the input design and operating parameters. In the present paper, the results of the theoretical study carried out to study the effect of such parameters on pressure pulsations and their harmonics have been presented. The effect of pipe diamet...

In this work, an unsteady state analysis of the compression cycle of a small hermetic reciprocating compressor for domestic refrigeration was carried out. The mass and energy balances were applied to the refrigerant inside the cylinder in order to determine the mass and temperature behaviour through the compression process. A specific onedimensional model of the valves was developed to calculat...

A numerical optimization of the suction valve of a large reciprocating compressor has been carried out as a case study, using a combination of a compressor simulation program and a genetic optimization algorithm. This optimization algorithm is based on the theory of biological evolution: survival of the fittest. The compressor simulation program solves the mass and energy conservation laws for ...

Computer simulation of the thermodynamic cycle of the cylinder process of compressors providef' valuable information for compressor engineers. For example, the valve losses and the gas pulsation losses can be estimated from the simulation results. In general, the results of the computer simulation suggest that increasing the discharge port area always reduces the related valve loss and thus hel...

Internal pressure waves influence the performance of reciprocating compressors in two ways: Firstly they interact with the valve dynamics and secondly they excite an oscillating moment onto the piston. On the basis of 2-D and 3-D simulations using a commercial CFD code and the experiences of compressor manufacturers a 1-D flow model is introduced. Valve dynamics are described by a modified Cost...

Mathematical modeling of the dynamic processes in a compressor involves a knowledge of the various forms of energy exchange occurring in the system. Heat transfer to and from the gas is one such. Any detailed modeling of the heat transfer process would require a detailed knowledge of the temperature variations resolved to temporal scales at least as fine as the finest generated by the dynamics ...

Modern compressor analyzers enable plant operators to monitor compressors by acquiring and storing pressure changes measured inside the working cylinder, in suction and discharge chambers, furthermore ultrasonic signals and temperatures. The paper focuses on pressure changes inside the cylinder and the possibilities of detecting abnormal operating conditions, in particular valve leakage, by ana...

This paper describes a method by which the Kerr [1] mathematical model of a reciprocating compressor having rigid valve plates may be adapted to investigate the dynamic response of flexible valves of certain geometries. The method is restricted to flexible valves which can be modelled by spring-mass systems. Also, the section of the valve plate which is directly over the valve port must remain ...