In the design of the small hermetic compressor, the forces acting on the compressor shell are important parameters to study for noise and vibration control. However, the input forces to the shell cannot be measured directly. In this paper, random force spectra on compressor shell has been measured indirectly with in-situ · vibration responses and system information. Three existing techniques of...

Title of Dissertation: INVESTIGATION OF VAPOR INJECTION HEAT PUMP SYSTEM WITH A FLASH TANK UTILIZING R410A AND LOW-GWP REFRIGERANT R32 Xing Xu, Doctor of Philosophy, 2012 Dissertation Directed by: Professor Reinhard Radermacher Department of Mechanical Engineering Vapor injection technique has proven to be effective in improving heat pump system performance, especially for cooling application a...

This paper describes the concept and the design features of a new, oilfree, reciprocating high pressure compressor for technical gases. The compressor is unique in concept and design, and introduces various new design elements. A magnetic coupling makes the compressor hermetic and allows inlet pressures of up to 16 bar. A new kind of clearance seal in the high-pressure stages allows reliable oi...

The application of carbon dioxide as natural refrigerant in commercial refrigeration systems has attracted higher interest in recent years for its promising energy efficiency and ecological sustainability. This paper presented the development of a low side scroll compressor for the bottle cooler application in the trans-critical cycle. Experimental tests were performed in two different temperat...

A new type of compression mechanism named "Helical Compressor'' was presented at the Purdue Conference in 1992 and 1998 [Refs.1-2]. There they showed the design, performance of the prototype, theoretical analysis, and its potential. After that fundamental experiment and theoretical analysis have . clarified various phenomenon in the Helical Compressor. As a result, we can successfully achieve t...

This paper describes a new design of low power 3-2 compressor circuit for high speed multipliers. Power consumption of proposed 3-2 compressor circuit varies from 0.355 nW to 1.6964 nW and delay varies from 2.0390 ns to 2.0224 ns. Further, power delay product of proposed circuit varies from 7.23×10 -18 (J) to 34.30×10 -18 (J) with varying supply voltage from 1.8V to 3.3V. The proposed compresso...

Tris paper, through analy3is to the specific power of the compressor, indicates that to reduce the power loss caused by friction is an important way to reduce the specific power of the compressor, investigates the realizability employing a single piston ring or a piston ring with small elasticity in the high speed double acting compressor, and raises a standpoint for a high speed double acting ...

In this paper, we propose an FPGA design of an audio signal level compressor, based on an approximation algorithm using a polynomial. To implement a compression characteristic in a digital audio system, the gain calculation with fractional numbers is performed by using a polynomial expression to approximate the power operation, then the compressor can be designed with a number of additions, mul...

A design point simulation and adaptation of anindustrial GE LM2500+ gas turbine engine is presented. The design point is chosen when the engine runs steadily at operating point and close to the nominal design condition at 29MW power output. The targeted performance parameters are the fuel flow rate (FF), the compressor exit total pressure (P3), the compressor turbine total exit temperature (T8)...