The 3D pyramid compressor project at the University of Glasgow has developed a compressor for images obtained from CLSM device. The proposed method using a combination of image pyramid coder and vector quantization techniques has good performance at compressing confocal volume image data. An experiment was conducted on several kinds of CLSM data using the presented compressor compared to other ...

A number of compressor design modifications to reduce the noise which are based on the modal characteristics of the compressor shell are discussed and special problems are pointed out. Most design changes exhibit effects across broad frequency regions and while reducing the noise in some frequency bands can cause noise increases in other bands. Shell damping was found to be a generally consiste...

The air conditioning and refrigeration systems noise consideration is continuously growing, implying more and more compressor noise measurements [1], even in-situ [2][3]. This article will introduce a new validated finite-element method to obtain the compressor noise from vibration measurements from standard test rig or directly in the field. We will describe the methodology; the devices & tool...

The energy regulation on the refrigeratory compressor is described. Both the energy-saving principle and performance of conversion compressor are discussed in detail. Two different modes of the control for compressor, frequency conversion cooling and full-frequency run, are compared here. It is concluded that frequency conversion is better than full-frequency on energy-saving. The energy saving...

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 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 ...