For a given linear compressor, the geometric configuration of the PTR (pulse tube refrigerator) affects the dynamic behavior of the linear compressor as well as the cooling performance of the PTR. The geometric configuration of each component precisely determines the flow impedance which contains the flow resistance, the inertance effect, and the compliance effect. In this paper, several simula...

A one hour integrated flask sampling system to collect air in automated NOAA/ESRL 12-flask packages is described. The integrating compressor system uses a mass flow controller to regulate the flow of air through a 15 l volume, thus providing a mixture of air collected over an hourlong period. By beginning with a high flow rate of 3.8 standard liters per minute and gradually decreasing the flow ...

In this paper we propose to present Asymptotic Tracking applied to the tracking problem for a Turbocharged Diesel Engine (TDE). Our goal is to track desired values of TDE which are the gas pressure in the intake manifold and the compressor mass flow rate. Nevertheless for this system with its chosen outputs one faces to the known problem of non-minimum phase systems. To avoid this, the problem ...

This paper proposes a low vibration stopping method by switching between the free-run and short-circuit braking modes of compressor. Vibrations are generated bouncing rotor caused load torque fluctuations. The proposed suppresses motor during suction process, thereby preventing generation large torque. In order to stop switches from mode at top dead center, which is starting point process. Furt...

A novel method for combining active surge control system (ASCS) and surge avoidance system (SAS) for a centrifugal compressor is presented. ASCS is a promising method to improve compressor operating area by stabilizing surge. However, this method is not applied yet in industrial compressors. Safety issue is considered in implementing the ASCS. A failure in ASCS may endanger the compressor by en...

The selection of lubricant is a key point in developing rotary compressor using R407C as a substitute for R22. The viscosity of oil, miscibility with refrigerant, thermal stability and compatibility with motor materials, etc, are all considerations. Furthermore, by reason of the POEs are more hygroscopic than mineral oils, hydrolytic stability and hygroscopicity of the selected oil must be cons...

Abstract: This paper is focused on the performance of centrifugal compressors for vehicle turbochargers operating at high altitude. The reasons for turbocharged diesel engine power loss increases and bad economy performance caused by exhaust gas energy utilization are investigated. The atmosphere’s impact on the turbocharger centrifugal compressor’s energy distribution characteristics under the...

Research on the various aspects of hermetic compressor design and development has been going on for a long period of time. As old questions get answered, new ones keep coming up. So much work has been done that a beginner in the compressor design field could easily get confused, and might not even know where to start. The purpose of this paper is to present a consolidated and simplified design ...

Flow losses through the valve ports contribute a significant portion to the total energy loss of a high speed compressor. As a result, in the energyconscious world of today, compressor designers are always busy finding methods and techniques to minimize these losses. It can be argued that the various fundamentally different compressor concepts would have different valve flow losses simply as a ...

This paper is intended as a review of the recent research and development of refrigeration and gas compressors in Japan. The review has been carried out by the papers as source material that are reported in the transactions, proceedings, and magazines in mechanical engineering field. Most compressor companies in Japan have long efforted to develop and apply advanced technology for innovative re...