Expedited method of testing and refinement of refrigeration centrifugal compressors

Igor Sukhomlinov,Mihail Golovin,N Vatin,P Zunino,E Vdovin

doi:10.1051/e3sconf/201914006004

Abstract

Currently existing regulatory documents assume that refrigeration compressors are tested as part of test rigs with heat-exchange equipment. Given the high energy intensity of centrifugal compressors, the drive power of which in cooling mode with a cold capacity of up to 8.0 MW can be 2.0 or more MW, the creation of test rigs for preliminary and acceptance tests at the manufacturer’s factory requires a large investment. An alternative to the considered refrigeration centrifugal compressors test method is a test on a test rig in which the agent is partially condensed. In this case, an evaporator and a full-sized condenser are not required. The mathematical model of the refrigeration centrifugal compressors developed by JSC VNIIKHOLODMASH, allows testing of the refrigeration centrifugal compressors in model conditions, when the entire compressor operation cycle at the test rig is carried out in the area of superheated steam. Since the refrigeration centrifugal compressors mathematical model is based on physical simulation of compression processes in model stages at different values of conditional Mach numbers, dimensionless characteristics of model stages can be used to calculate the characteristic of the created compressor when operating under new conditions. The implementation of the model test method provides reduction of testing time due to absence of phase changes of the agent, improves the accuracy of the obtained results, reduces of power consumption, simplifies the test rig, and reduces consumption of the agent for filling the rig and water for cooling the agent.

Highlights

Centrifugal compressors play an important role in the economies of industrialized countries
Existing regulatory documents, including the European standard DIN EN 13771-1: 2016 [1], on the basis of which Rossoyuzholodprom has prepared the draft GOST R EN 13771-1-XXXX, assume that refrigeration compressors are tested as part of test rigs with heat-exchange equipment (HEE) that ensures the implementation of the thermodynamic cycle of the chiller, which means that in practice the compressor is within the chiller
The mathematical model (MM) of the refrigeration centrifugal compressors (RCC) developed by JSC VNIIKHOLODMASH for selecting the operating and geometrical parameters of the compressor [13], which proved its reliability in organizing serial production at the Kazancompressormash JSC of the third generation of refrigeration machines of the TXMV type, allows testing of the RCC in model conditions, when the entire compressor operation cycle at the test rig is carried out in the area of superheated steam

Summary

Introduction

Centrifugal compressors play an important role in the economies of industrialized countries. They are used to compress gases in the chemical, oil, gas and machinebuilding industries, in transport and metallurgy, construction, production of ammonia fertilizers, plastics, petrochemical products, in oil and gas production, in the refrigeration industry, as turbochargers, in gas turbines, in pneumatic plants. The problem of optimal design of centrifugal compressors is very important. Russian and foreign organizations are currently engaged in the researches and improvement of centrifugal compressors [1,2,3,4,5,6,7,8,9]. Traditional approaches to the design of centrifugal compressors are based on the results of stage models tests that are carried out on test rigs

Methods

Results

Conclusion