Mathematical Modeling and Simulation of Refrigerating Compressors

Development and Optimization of Screw Engine Rotor Pairs on the Basis of Computer Modeling

The paper presents some recent results in the development of new lobe profiles for the main and gate rotors of a screw compressor, based on the computer modelling of the compression process. The new profile, featured by slenderer gate lobes, as compared with standard asymmetric SRM profiles, yields larger cross-sectional flow areas, enabling higher delivery rates for the same tip speeds. The pr...

Modeling, simulation and optimization of gas networks with compressors

We consider gas flow in pipeline networks governed by the isothermal Euler equations and introduce a new modeling of compressors in gas networks. Compressor units are modeled as pipe–to–pipe intersections with additional algebraic coupling conditions for the compressor behavior. We prove existence and uniqueness of solutions with respect to these conditions and use the results for numerical sim...

Comparison of Performances Between R404A and AZ50 Used in Commercial Refrigeration

Denis CLODIC Centre d'Energetique ·Ecole des Mines de Paris 60, boulevard Saint-Michel· F • 75272 PARIS Cedex 06 A test bench has been developed consisting in an open display-case and a refrigerating system composed mainly of four hermetic compressors, an air cross-current condenser and an evaporator. The evaporating temperature of -40°C allows to keep the temperature of the products at ·18°C f...

New Designed System of Computer Programs to Generate, Evaluate, Check-up, Manufacture and Measure Automatically Fairs of Screw Rotors of Refrigerating Compressors

Modeling and Optimization of Industrial Multi-Stage Compressed Air System Using Actual Variable Effectiveness in Hot Regions

In this article, modeling and optimization of power consumption of two–stage compressed air system has been investigated. To do so, the two – stage compressed air cycle with intercooler of FAJR Petroleum Company was considered. This cycle includes two centrifugal compressors, a shell, and a tube intercooler. For modeling of power consumption, actual compressors isentropic efficiencies and inter...