The design of two series of twin screw compressors for being used in refrigeration applications are reported in this paper. The capacity range for the open type series is from 85 to 4300 h m / 3 , and for the semi-hermetic series from 120 to 2600 h m / 3 . The rotor profile and other design parameters are optimized with the help of the software package SCCAD. Many new features are adopted in th...

In any development, screw compressor has several prominent roles. One is its unavoidable application in infrastructure building of the road and railway networks, as well as in major housing developments. Other roles are introduction of new compressor manufacturing facilities and a consequential improvement of the existing compressor industry in which the screw compressor has a vital part as an ...

Random Number Generators play a critical role in a number of important applications. In practice, statistical testing is employed to gather evidence that a generator indeed produces numbers that appear to be random. In this paper, we reports on the studies that were conducted on the compressed data using 8 compression algorithms or compressors. The test results suggest that the output of compre...

Isobaric expansion (IE) technology is a promising solution for mini- and medium-scale low-grade heat utilization. IE engines directly convert to mechanical energy are particularly interesting as direct-acting, vapor-driven pumps compressors. The elimination of multiple transformations, technical simplicity the ability use widely available (<100 °C) instead fossil fuels attractive features th...

purpose: to evaluate the effect of childhood corneal opacity on the anteroposterior length of the globe in adulthood. methods: twenty-three patients with significant unilateral corneal opacity which had developed before the age of 6 years and the normal fellow eyes (controls) were evaluated. a comprehensive ocular examination including measurement of anterioposterior length and anterior chamber...

CFD has become a buzz word in all sectors and many industries, while the positive displacement compressor industries are rather slow in embracing it. The paper examines whether it is because positive displacement compressors were considered as basically thermodynamic devices or due to the inherent challenges for application. The paper discusses the need for CFD and it’s current status in genera...

Rotating stalls are one of the most dangerous phenomena to be avoided in designing and operating axial flow compressors. An understanding evolution characteristics around rotor tip region is important study process stall development. In this paper, some critical stall-related structures, which could not observed by traditional analysis methods, understood using proper orthogonal decomposition (...

In the paper the weak points of today's reciprocating compressors arc described. Referring to latest internal combustion engine technologies and improvements, some possible application on reciprocating compressors will be described and discussed as: • Application of advanced Electromechanical Valves (EMV) with fully variable valve actuation in order to increase compressor speed ("downsizing") a...

background: the adverse effects of noise are well known and noise problems due to industrialization of communities are increasing over the time. oil industries due to the process and nature of production; contain many noise sources such as compressors, turbines, and pumps, which cause excessive noise exposure. the objective of this study was to evaluate the noise characteristics of compressors ...

An axial compressor has high efficiency under design conditions, but its stable working range is narrow. Adjusting the rotational speed can effectively expand range. In this paper, a five-stage for specific compressed air energy storage (CAES) system taken as research object, and different (DRS) characteristics are studied with NUMECA software. Firstly, influence of DRS on overall aerodynamic p...