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Performance And Operating Characteristics Of A Novel Rotating Spool Compressor, Joe Orosz, Greg Kemp, Craig Bradshaw, Eckhard A. Groll Jul 2012

Performance And Operating Characteristics Of A Novel Rotating Spool Compressor, Joe Orosz, Greg Kemp, Craig Bradshaw, Eckhard A. Groll

International Compressor Engineering Conference

The basic mechanism of the novel rotary spool compressor has been described previously by Kemp et al. (2008, 2010). The device combines various aspects of rotary and reciprocating devices currently well understood to achieve high efficiency at a low manufacturing cost. A dimensionless variable, the Zsoro number, is developed which represents the ratio of the geometric configuration of the compressor relative to the potential friction components of the compressor. This number allows for rapid evaluation of the geometric features of the device. Four prototype spool compressors have been tested using R410A and R134A at standard air conditioning conditions with various …

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Development Of A R744 Low Side Variable Speed Scroll Compressor For Bottle Cooler Application, Yueh-Ju Tang, Yangguang Liu Jul 2012

Development Of A R744 Low Side Variable Speed Scroll Compressor For Bottle Cooler Application, Yueh-Ju Tang, Yangguang Liu

International Compressor Engineering Conference

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 temperatures of the outlet refrigerant of the gas cooler with the same operation speed. For comparison of performance of the prototype, a small commercial reciprocating compressor was tested at the same operational conditions. Experimental results show that scroll compressor performed significantly better than the small commercial …

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Spool Compressor Tip Seal Design Considerations And Testing, Greg Kemp, Joe Orosz, Craig Bradshaw, Eckhard A. Groll Jul 2012

Spool Compressor Tip Seal Design Considerations And Testing, Greg Kemp, Joe Orosz, Craig Bradshaw, Eckhard A. Groll

International Compressor Engineering Conference

The simple analysis, design, construction and testing of the spool compressor’s tip seal is presented. Analysis yields key design considerations for seal geometry, preloading and pressure balance. Several seal designs are constructed and tested for leakage. Volumetric efficiency is calculated for three tip seal configurations and presented as a function of pressure ratio. It is determined that a two piece seal that expands axially results in less leakage. Further, it is determined that fluid pressure activation of the tip seal improves performance and eliminates the need for a highly loaded biasing spring. It is concluded that the tip seal performance …

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Spool Seal Design And Testing For The Spool Compressor, Greg Kemp, Joe Orosz, Craig Bradshaw, Eckhard A. Groll Jul 2012

Spool Seal Design And Testing For The Spool Compressor, Greg Kemp, Joe Orosz, Craig Bradshaw, Eckhard A. Groll

International Compressor Engineering Conference

Several seals, designed to minimize leakage between the rotating spool assembly’s endplates and the stationary compressor housing, are introduced, constructed and tested. Some designs are deemed impractical due to either high leakage or high torque. A novel one piece hybrid design that blends the function of a face seal and piston ring is tested and shown to achieve excellent results. A test apparatus is introduced to isolate and measure the spool seal’s performance independent of the compressor. It is concluded that the hybrid design is highly effective and well suited for many applications of the spool compressor.

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An Efficient Immersed Boundary Method For Solving The Unsteady Flow Through Actual Geometries Of Reed Valves, José Luiz Gasche, Franco Barbi, Millena Martins Villar Jul 2012

An Efficient Immersed Boundary Method For Solving The Unsteady Flow Through Actual Geometries Of Reed Valves, José Luiz Gasche, Franco Barbi, Millena Martins Villar

International Compressor Engineering Conference

In refrigeration compressors, the suction and discharge valves are responsible for the retention of the refrigerant from the suction chamber to the cylinder and passage from the cylinder to the discharge chamber. As the opening and closing of the valves are caused by the forces produced by the refrigerant flow, the understanding of the flow through the valve is of fundamental importance in order to enhance the efficiency of the valve system. The numerical simulation of the flow is an efficient method to perform this task. Due to the complex geometry usually found in this type of valve, simplified geometries …

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Parametric Representation Of Scroll Geometry With Variable Wall Thickness, Bryce R. Shaffer, Eckhard A. Groll Jul 2012

Parametric Representation Of Scroll Geometry With Variable Wall Thickness, Bryce R. Shaffer, Eckhard A. Groll

International Compressor Engineering Conference

In a scroll-type compressor, compression is achieved by relative contact between two spiral curves. Since the scroll invention by Leon Creux in (1905) multiple methods have been developed for calculating the scroll geometry and pocket volume. What can generally be considered the most classical method, is defining each scroll curve as the involute of a circle. The two sets of scroll curves are then closed by using the arc of a circle to form the tip of each spiral. In this paper, a new method to calculate the scroll geometry is introduced. By deriving each scroll curve from the radius …

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Numerical Study On The Oil Pump System Of Rotary Compressor, Chunhui Liu, Yuanming Yuan, Yanzhen Wang Jul 2012

Numerical Study On The Oil Pump System Of Rotary Compressor, Chunhui Liu, Yuanming Yuan, Yanzhen Wang

International Compressor Engineering Conference

Oil pump lubrication system is an essential part of compressor to ensure the normal operation. During the process of compressor running, lubricant system can form oil film on surface of moving parts to decrease friction and reduce abrasion and occlusion. In order to meet the lubrication requirements, we must design pump oil structure reasonable. However, oil lubricating and circulating process is a complex and dynamic process, only if through experimental study to understand the characteristics of each components in oil lubrication system is very difficult. Therefore, in this article, we use commercial software CFD to research the best pump structure. …

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Numerical Calculation And Analysis Of Lubricating Water Film Cavitation Of A Water Flooded Air Single Screw Compressor, Rui Huang, Ting Li, Quanke Feng, Weifeng Wu Jul 2012

Numerical Calculation And Analysis Of Lubricating Water Film Cavitation Of A Water Flooded Air Single Screw Compressor, Rui Huang, Ting Li, Quanke Feng, Weifeng Wu

International Compressor Engineering Conference

Reynolds equations and one-phase model with N-S (Navier Stocks) equations are widely used to calculate pressure distribution in the liquid film. In most cases, negative pressure exits in the obtained results. In a water-flooded single screw compressor, it is necessary to investigate the pressure of water film along the whole tooth flank. A negative pressure may not be right, because that when the pressure is lower than the saturated vapor pressure, cavitation occurs. In this paper, we investigated the pressure distribution of the water film with cavitation model. Results were compared to the pressure distribution obtained by one-phase model using …

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The Friction And Wear Characteristic Of Fe-Based P/M Materials In Scroll Compressor, Zhengliang Shi Jul 2012

The Friction And Wear Characteristic Of Fe-Based P/M Materials In Scroll Compressor, Zhengliang Shi

International Compressor Engineering Conference

With the development of materials science and technology, Iron-based powder metallurgy (P/M) antifriction materials gradually used to scroll compressor. In this paper, three kinds of Iron-based powder metallurgy antifriction materials, which are Fe-C-Cu, Fe-C-Cu-Ni-Mo and Fe-P were prepared by the common compacting sintering method. Microstructure and mechanical properties were studied, tribological properties were tested on the friction tester, and surface topographical characteristics and wear mechanism of the Iron-based powder metallurgy materials antifriction were observed and analyzed by scanning electron microscope (SEM). The results showed that, the strength of Fe-C-Cu and Fe-C-Cu-Ni-Mo are higher than Fe-P. The microstructure of Fe-C-Cu and …

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Identification Of Energy Path In The Interaction Between Compressor And Refrigerator, Giovanni Bratti, Otávio Santini Junior, Edmar Baars, Renato Barbieri, Claudio Pellegrini Jul 2012

Identification Of Energy Path In The Interaction Between Compressor And Refrigerator, Giovanni Bratti, Otávio Santini Junior, Edmar Baars, Renato Barbieri, Claudio Pellegrini

International Compressor Engineering Conference

Refrigeration equipments, in particular domestic refrigerators, are devices that are present in our day to day. Often, these devices are very close to our workplaces, laser or rest, where the noise produced by such sources can be intense enough to cause discomforting sensations, fatigue, or even to prejudice the communication between the people. Thus, the concern with the noise produced from these devices has gained a great importance both for consumers and for manufacturers of refrigerators. Thinking in area of control of noise and vibrations, is of great importance the precise knowledge about the dynamic behavior of the components of …

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An Investigation Of Refrigerant Oil Retention In An Air Conditioning System With Two Inverter Compressors In Parallel, Cheng-Shu Kuo, Wei-Yueh Cheng, Wen-Der Hsieh, Yangguang Liu Jul 2012

An Investigation Of Refrigerant Oil Retention In An Air Conditioning System With Two Inverter Compressors In Parallel, Cheng-Shu Kuo, Wei-Yueh Cheng, Wen-Der Hsieh, Yangguang Liu

International Compressor Engineering Conference

A VRF (variable refrigerant flow) air conditioning, having a number of air handling units connected to an external condensing unit, commonly uses two or more compressors in the system. The complicated piping system of the VRF air conditioning causes difficulties for refrigerant oils to return back to each compressor, especially for compressors operating in different frequencies. Compressors need lubrication in operation process, otherwise the compressor will burn out because of wearing and overheating. Therefore, whether refrigerant oils can successfully return back to each compressor has become a key issue in the VRF air conditioning system. To this regard, this report …

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Research Of R290 Compressor Effect On Rac System Charge Amount, Bin Gao, Zhenhua Chen, Qiang Gao Jul 2012

Research Of R290 Compressor Effect On Rac System Charge Amount, Bin Gao, Zhenhua Chen, Qiang Gao

International Compressor Engineering Conference

During the process of refrigerant alternative, R290 (propane), as a nature refrigerant used in Room Air Condition (RAC) system, is thought as a long-team substance and has attracted great attention. This paper simply introduced the characteristics and standard demands of R290 application, then, based on a 1HP R290 DC INV. RAC system at first, then finished the comparison test when a one-cylinder and a two-cylinder rotary compressor was matched, in addition, deeply analyzed the connection between RAC system performance and refrigerant charge amount according to the test results. Lastly, comprehensive consideration of the refrigerant charge amount, analyzed the different demands …

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Rigid-Frame Porous Material Acoustic Attenuation On Compressor Discharge, Paulo Henrique Mareze, Arcanjo Lenzi, Claudio Pellegrini Jul 2012

Rigid-Frame Porous Material Acoustic Attenuation On Compressor Discharge, Paulo Henrique Mareze, Arcanjo Lenzi, Claudio Pellegrini

International Compressor Engineering Conference

Standards have limited the allowable noise levels in different situations, requiring the study of solutions at the source, in the path or the receiver. Muffler is the major factor influencing the noise of rotary compressor. Control and analyze the acoustic characteristics of muffler is essential. Porous materials have been studied and widely applied to reduce aircraft and vehicular noise or industrial problems in general. Generally, designers use absorbing materials available on the market, however they are not always adequate to the problem when there is the presence of another gas, for example in hermetic compressors. Thus it is proposed to …

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A Lumped Thermal Parameter Model For Scroll Compressors Including The Solution Of The Temperature Distribution Along The Scroll Wraps, Marco C. Diniz, Evandro L. L. Pereira, Cesar J. Deschamps Jul 2012

A Lumped Thermal Parameter Model For Scroll Compressors Including The Solution Of The Temperature Distribution Along The Scroll Wraps, Marco C. Diniz, Evandro L. L. Pereira, Cesar J. Deschamps

International Compressor Engineering Conference

A lumped parameter thermal model has been developed to predict the temperature distribution of scroll compressors with especial attention to gas superheating in the suction process. Thermal resistances between the components were based on global heat transfer coefficients, whereas conduction heat transfer through the scroll wraps was solved via a one dimensional finite volume method. The thermal model was coupled to a thermodynamic model of the compression cycle and then applied to simulate the compressor performance at different conditions of speed and pressure ratio. The model was able to correctly predict the compressor temperature distribution for operating conditions within the …

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Minimum Viscosity For Bearing Reliability In R290 Rotary Compressors, Xingbiao Zhou Jul 2012

Minimum Viscosity For Bearing Reliability In R290 Rotary Compressors, Xingbiao Zhou

International Compressor Engineering Conference

R290 which has been considered for use in room air conditioning systems as low global warming potential (GWP) refrigerant has attracted great attention. This refrigerant is determined the lubrication performance of the sliding parts (especially the bearings) in rotary compressor. It is important to prevent the sliding parts from seizure and wear. To ensure the bearing reliability, it is traditional for R290 compressor manufacturer to specify a minimum oil sump temperature difference above the saturated discharge temperature. It is a surrogate measure of minimum viscosity required to ensure adequate lubricant film thickness in bearings under the system flooding conditions. The …

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A New Mechanical Oil Sensor Technology, Weihua Guo, Qiang Liu, Ruiqiang Wang, Hongshan Li Jul 2012

A New Mechanical Oil Sensor Technology, Weihua Guo, Qiang Liu, Ruiqiang Wang, Hongshan Li

International Compressor Engineering Conference

In view of disadvantages of commercially available oil level sensing products, this paper introduces a new mechanical type of oil sensor for refrigeration compressor’s oil level protection, which is used to avoid failure due to lack of oil in the compressor, especially when multi-compressors were connected in parallel. The paper analyzed this new mechanical oil senor in terms of superiority comparing with other type oil sensor, theoretical working principle, design concept, functional test and typical application on multi-compressors system. The method of installation and the system control logic are also discussed.

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Development Of Dc Inverter Scroll Compressor Used For Marine Container Refrigeration Unit, Tomomi Yokoyama, Katsumi Kato, Nobuhiro Nojima, Keiji Yoshimura, Hiroshi Kitaura Jul 2012

Development Of Dc Inverter Scroll Compressor Used For Marine Container Refrigeration Unit, Tomomi Yokoyama, Katsumi Kato, Nobuhiro Nojima, Keiji Yoshimura, Hiroshi Kitaura

International Compressor Engineering Conference

In recent years, energy saving of a container ship is becoming one of the most important issues from the point of environmental protection of the global marine transportation business. To solve this problem, we have developed a new gas injection inverter scroll compressor for marine container refrigeration unit. The new compressor is based on a conventional scroll compressor, which has been used in various industrial air conditioners for a long time, with some greatly improved technologies. For instance, the efficiency of the compressor is increased by optimizing the gas injection mechanism. On top of this, the efficiency at low speed …

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Design And Development Of Three Phase Permanent Magnet Brushless Dc (Pm Bldc) Motor For Variable Speed, Srinivas Mallampalli, Adnan Bohori, Subhrajit Dey Jul 2012

Design And Development Of Three Phase Permanent Magnet Brushless Dc (Pm Bldc) Motor For Variable Speed, Srinivas Mallampalli, Adnan Bohori, Subhrajit Dey

International Compressor Engineering Conference

A major part of the power consumption in the low-wattage reciprocating compressors, used for household refrigeration units, is associated with the motor. A variable speed compressor as opposed to a single speed compressor is known to provide energy savings due to its ability to match the load demand from the pump more closely to the power delivered by the pump. The current article presents an overview of the design and optimization methodology for a variable-speed, three-phase PM BLDC motor. The design is evaluated for a four pole configuration with operating frequencies ranging from 66.66Hz all the way up to 150 …

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Numerical Simulation Of Wrap Scroll Temperature For Refrigeration And Air Conditioning Compressors, Jordi Rovira, Joaquim Rigola, Carlos D. Pérez-Segarra, Assensi Oliva Jul 2012

Numerical Simulation Of Wrap Scroll Temperature For Refrigeration And Air Conditioning Compressors, Jordi Rovira, Joaquim Rigola, Carlos D. Pérez-Segarra, Assensi Oliva

International Compressor Engineering Conference

Being part of a model which simulates the whole consecutive overall compression process in a scroll compressor by solving equations of mass, momentum and energy balance for fluid refrigerant (Rovira et al.,2006), an updated version is presented. In this new model, an energy balance over the scroll wraps is implemented; where temperatures and heat fluxes are obtained dividing the wall into 36 parts (slices) each turn. The scroll wrap is divided into different solid slices; energy balance is carried out, taking into account: i) conduction along the scroll wrap; ii) convection heat transfer between each slice and each fluid chamber, …

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A Procedure To Optimize Reed Type Valves Considering Efficiency And Bending Fatigue, Ernane Silva, Cesar J. Deschamps, Eduardo A. Fancello Jul 2012

A Procedure To Optimize Reed Type Valves Considering Efficiency And Bending Fatigue, Ernane Silva, Cesar J. Deschamps, Eduardo A. Fancello

International Compressor Engineering Conference

Reed valves are the most common type of valves used in small compressors due to their simplicity and low cost. Such valves greatly affect the compressor volumetric and isentropic efficiencies and their suitable design is also crucial for reliability, since they may be subjected to severe bending and impact stresses. This paper reports an optimization procedure for reed type valves considering efficiency and bending fatigue, which is attained by coupling a thermodynamic model for the compression cycle and a finite element model for the valve dynamics. Then, a genetic algorithm is adopted to find different valve geometries that give the …

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Modeling Of Gas Leakage Through Compressor Valves, Leandro R. Silva, Cesar J. Deschamps Jul 2012

Modeling Of Gas Leakage Through Compressor Valves, Leandro R. Silva, Cesar J. Deschamps

International Compressor Engineering Conference

Gas leakage in the incomplete sealing of valves may significantly affect the volumetric and isentropic efficiencies of compressors. This paper describes a model developed to predict gas leakage in reed type valves of small reciprocating compressors commonly adopted for household refrigeration. Computations are carried out for a wide range of pressure differences that prevail in the valve clearances during the complete compression cycle. Results for mass flow rate in the suction and discharge valves are used to analyze the influence of geometric parameters on the leakage process. Reed deflection into the valve port due to pressure load is seen to …

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Derivation Of Optimal Scroll Compressor Wrap For Minimization Of Leakage Losses, Ian H. Bell, Eckhard A. Groll, James E. Braun, W. Travis Horton Jul 2012

Derivation Of Optimal Scroll Compressor Wrap For Minimization Of Leakage Losses, Ian H. Bell, Eckhard A. Groll, James E. Braun, W. Travis Horton

International Compressor Engineering Conference

The scroll wraps of a scroll compressor play a very important role in the compressor’s efficiency due to their impact on leakage and leakage irreversibilities. In this work, a short summary of the scroll compressor geometry is presented. Using the geometry of the scroll wraps, an optimal scroll wrap geometry is derived for a given set of constraints on compressor displacement, scroll wrap thickness and volume ratio. This optimal scroll wrap geometry can be used as a starting point for further optimization in a detailed compressor model that includes the effects of mechanical losses.

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Simulation Analysis Of A Two Rolling Piston Expander Replacing Throttling Valve In Conventional Refrigerant Heat Pump System, Li Zhao, Minxia Li, Yitai Ma, Zhongyan Liu Jul 2012

Simulation Analysis Of A Two Rolling Piston Expander Replacing Throttling Valve In Conventional Refrigerant Heat Pump System, Li Zhao, Minxia Li, Yitai Ma, Zhongyan Liu

International Compressor Engineering Conference

An expander is employed to replace a throttling valve in a heat pump system of the conventionorder to further improve the efficiency of the system by recovering partial expansion work to decconsume of the system. Due to large expansion ratios of conventional refrigerants, a twone-stage expander was proposed and designed. Simulation analysis was developed by analyzing irreversible losses in the expansion work process. The simulation results show that, friction losses of a conventional refrigerant expander are 80.2% of total losses, which are the main factors to influence the efficiency of expander. Then the measures of reduciong friction losses are presented, …

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The Application Of Monte Carlo Method For Sensitivity Analysis Of Compressor Components, Marcos Giovani Dropa De Bortoli, Julio César Silva Jul 2012

The Application Of Monte Carlo Method For Sensitivity Analysis Of Compressor Components, Marcos Giovani Dropa De Bortoli, Julio César Silva

International Compressor Engineering Conference

The robustness evaluation of compressor components must take into account the variations in the mechanical properties of the material (such as Young's modulus and mass density), geometric parameters (as radius, thickness, length) and loads. Sometimes, the combination of these factors could result in the component failure. The correct way to assess the robustness of the component (considering the parameters variation) is through the statistical analysis using probabilistic design techniques. One methodology is the application of Monte Carlo method to generate random combinations of geometrical, loads and physical parameters that produce the same real component variation. This work shows the application …

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Multivariable Identification And Control Of A Calorimeter Used For Performance Evaluation Of Refrigerant Compressors, Rodolfo C. C. Flesch, Julio E. Normey Rico, Carlos A. Flesch, André P. Rosa Jul 2012

Multivariable Identification And Control Of A Calorimeter Used For Performance Evaluation Of Refrigerant Compressors, Rodolfo C. C. Flesch, Julio E. Normey Rico, Carlos A. Flesch, André P. Rosa

International Compressor Engineering Conference

Refrigerant compressors are relatively complex products that require a wide variety of tests to be performed for both product development and quality control. Performance tests are an example of such tests and they are typically performed using test rigs with calorimeters. This paper presents the experimental results of the use of a multivariable dead-time compensating structure to control the conditions at the calorimeter inlet and outlet. Besides the control results themselves, the paper presents the identification of the multivariable model used for control purposes, as well as it discusses tuning and implementation of the proposed controller. The closed-loop experimental results …

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The Research On The Performance Of Oil-Gas Cyclone Separators In Oil Injected Compressor Systems With Considering The Collision And Breakup Of Oil Droplets, Xiang Gao, Yaopeng Zhao, Xin Yang, Yunfeng Chang, Xueyuan Peng Jul 2012

The Research On The Performance Of Oil-Gas Cyclone Separators In Oil Injected Compressor Systems With Considering The Collision And Breakup Of Oil Droplets, Xiang Gao, Yaopeng Zhao, Xin Yang, Yunfeng Chang, Xueyuan Peng

International Compressor Engineering Conference

The high-speed swirling flow field in the cyclone oil-gas separator will cause the breakup of oil droplets, thus reducing the separation efficiency. In this paper, the performance of an oil-gas cyclone separator was investigated through both numerical simulations and experiments with considering the breakup of oil droplets in oil-gas cyclone separators. The gas flow field was simulated using the RSM turbulence model and the trajectory of the oil droplets was calculated by the Discrete Phase Model(DPM).The breakup of oil droplets was simulated by TAB model and the wall boundary of oil droplets was treated as Reflect boundary. Meanwhile, the separation …

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Sound Attenuation In Elliptic Mufflers Using A Regular Perturbation Method, Subhabrata Banerjee, Anthony M. Jacobi Jul 2012

Sound Attenuation In Elliptic Mufflers Using A Regular Perturbation Method, Subhabrata Banerjee, Anthony M. Jacobi

International Compressor Engineering Conference

The study of sound attenuation in an elliptical chamber involves the solution of the Helmholtz equation in elliptic coordinate systems. The Eigen solutions for such problems involve the Mathieu and the modified Mathieu functions. The computation of such functions poses considerable challenge. An alternative method to solve such problems had been proposed in this paper. The elliptical cross-section of the muffler has been treated as a perturbed circle, enabling the use of a regular perturbation approach to solve the wave equation. The Eigen vectors of the perturbed system has been approximated by a series summation of the unperturbed Eigen solutions. …

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Numerical Analysis Of Performance, Rotor Temperature Distributions, And Rotor Thermal Deformation Of An R134a Screw Compressor, Shenghung Hsieh, Wenhsin Hsieh, Chishun Huang, Yuhua Huang Jul 2012

Numerical Analysis Of Performance, Rotor Temperature Distributions, And Rotor Thermal Deformation Of An R134a Screw Compressor, Shenghung Hsieh, Wenhsin Hsieh, Chishun Huang, Yuhua Huang

International Compressor Engineering Conference

A numerical analysis is performed to systematically calculate the performance, rotor temperature distributions, and rotor thermal deformation of an R134a screw compressor. The analysis procedure includes three major steps. The first step calculates the efficiencies and the temperature- and pressure-time histories of the refrigerant during a compression cycle of the screw compressor. The calculation is performed based on a theoretical model, which considers the mass and energy conservation laws, the leakages through various paths, and the discharges of gas and oil. The heat transfer between gas and oil is also considered. The second step calculates the temperature distributions in the …

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Comparison Of The Sound Quality Characteristics For The Outdoor Unit According To The Compressor Model., Sang-Gil Park, Jeong-Taek Park, Ki-Won Seo, Gil-Bong Lee Jul 2012

Comparison Of The Sound Quality Characteristics For The Outdoor Unit According To The Compressor Model., Sang-Gil Park, Jeong-Taek Park, Ki-Won Seo, Gil-Bong Lee

International Compressor Engineering Conference

As for the criteria to purchase an air conditioner, noise level has emerged as an important issue, equal to design characteristics and performance. The main feature of the noise of the outdoor unit is a complex characteristic noise due to the operation of the fan and compressor. Air-borne noise is usually caused by the vortex separation on the fan blade, and structure-borne noise is caused by compressor or vibration transmission to the chassis and components. Due to the efforts of researchers and designers who have worked on noise reduction, the sound pressure level (SPL) of outdoor units launched on the …

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Some Aspects Of Estimating Geometric Characteristics Of Screw Compressors, David Buckney, Ahmed Kovacevic, Elvedin Mujic, Nikola Stosic Jul 2012

Some Aspects Of Estimating Geometric Characteristics Of Screw Compressors, David Buckney, Ahmed Kovacevic, Elvedin Mujic, Nikola Stosic

International Compressor Engineering Conference

The methods used today for the calculation of screw compressor thermodynamic and fluid flow processes, from quasi one-dimensional thermodynamic models to three-dimensional computational fluid dynamics (CFD) procedures, require accurate identification and quantification of geometric parameters, such as volume, gradient and cross-section, leakage flow and blow-hole areas. Historically, some of the geometric characteristics have been neglected, or approximated when calculation accuracy was not essential. However, more sophisticated models may lose some of their advantages if accurate geometric characteristics are not included in them. The work presented in this paper is aimed to enhance the accuracy of geometric calculations. The usual geometric …

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