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2014

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Design Optimization Of The Suction Manifold Of A Reciprocating Compressor Using Sensitivity Analysis, Nasir Bilal Jan 2014

Design Optimization Of The Suction Manifold Of A Reciprocating Compressor Using Sensitivity Analysis, Nasir Bilal

International Compressor Engineering Conference

A new method for the design of the suction manifold of a reciprocating compressor using sensitivity and uncertainty methods was used. The objective was to pick the optimal values of the compressor suction manifold to minimize gas pulsations. The advantage of the method is that the input parameters do not have fixed values but a range is provided. Similarly, the output is specified in terms of a probability density function. Another advantage of this method is that we can set our limit on the maximum values of the gas pulsation that are permissible and then vary the input parameters so …

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Investigation Of Application Of Suction Line Heat Exchanger In R290 Air Conditioner With Small Diameter Copper Tube, Tao Ren, Guoming Wu, Guoliang Ding, Yongxin Zheng, Yifeng Gao, Song Ji Jan 2014

Investigation Of Application Of Suction Line Heat Exchanger In R290 Air Conditioner With Small Diameter Copper Tube, Tao Ren, Guoming Wu, Guoliang Ding, Yongxin Zheng, Yifeng Gao, Song Ji

International Refrigeration and Air Conditioning Conference

R290 is a potential refrigerant replacing R22 because of its zero Ozone Depletion Potential (ODP) and virtually zero Global Warming Potential (GWP). However, R290 is flammable and requires excellent containment to avoid leakage and reduce the risk of fire. The use of small diameter copper tube (5 mm or even smaller) is an effective way to reduce refrigerant charge and thus reduce the risk of fire in the event of a refrigerant leak. However, employing small diameter copper tube will increase pressure drop and consequently reduce system performance. A suction line heat exchanger which employs the low temperature refrigerant in …

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Experimental Study On Performance Of Two-Phase Ejector Refrigeration Cycle System With Two-Throat Nozzle, Li Qian Ren, Xian Min Guo, Xin Wei Guo, Tian Long Li Jan 2014

Experimental Study On Performance Of Two-Phase Ejector Refrigeration Cycle System With Two-Throat Nozzle, Li Qian Ren, Xian Min Guo, Xin Wei Guo, Tian Long Li

International Refrigeration and Air Conditioning Conference

The two-phase ejector refrigeration cycle (TPERC) system with a two-throat nozzle ejector was investigated experimentally, and the entrainment ratio of the ejector and the COP of the system were compared with those of the ejector with Laval nozzle and the TPERC system respectively. The experimental results indicate that the entrainment ratios of the two-throat nozzle ejectors with different geometric size are greater than those of the Laval nozzle ejectors under the working condition of the evaporating/condensing temperatures 1?/45?, the maximum increment of the entrainment ratio is about 18%, and the COP of the TPERC system with two-throat nozzle ejector is …

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Thermodynamic Analysis Of Adsorption Refrigeration Cycles Using Parent And Surface Treated Maxsorb Iii/Ethanol Pairs, Kutub Uddin, Ibrahim I. El-Sharkawy, Takahiko Miyazaki, Bidyut Baran Saha, Shigeru Koyama Jan 2014

Thermodynamic Analysis Of Adsorption Refrigeration Cycles Using Parent And Surface Treated Maxsorb Iii/Ethanol Pairs, Kutub Uddin, Ibrahim I. El-Sharkawy, Takahiko Miyazaki, Bidyut Baran Saha, Shigeru Koyama

International Refrigeration and Air Conditioning Conference

Adsorption equilibrium uptake of environment friendly refrigerant ethanol onto highly porous activated carbon based adsorbents has been experimentally investigated by using a magnetic suspension balance adsorption measurement unit (MSB-VG-S2). Adsorbents used in the present study are parent Maxsorb III, H2 and KOH-H2 surface treated Maxsorb III. Experiments have been conducted over adsorption temperatures range from 30 to 70 ºC and evaporation temperatures between -6 and 65 ºC. The Dubinin-Radushkevich and Dubinin-Astakhov adsorption isotherm models have been used to correlate adsorption isotherm data and to plot the pressure-temperature-concentration (P-T-W) diagrams of the assorted pairs. Isosteric heat of adsorption is estimated using …

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The Evaluation Method Of Hvac System’S Operation Performance Based On Energy Flow Analysis And Dea, Xing Fang, Xinqiao Jin, Bo Fan, Yonghua Zhu Jan 2014

The Evaluation Method Of Hvac System’S Operation Performance Based On Energy Flow Analysis And Dea, Xing Fang, Xinqiao Jin, Bo Fan, Yonghua Zhu

International Refrigeration and Air Conditioning Conference

An energy flow model of an airport terminal’s HVAC system is established in this paper. Based on energy flow model, the exergy efficiency, exergy loss and exergy cost distribution ratio of each component are calculated and analyzed by the energy flow model. Optimization method and exergy balance equations are used to calculate the least exergy loss of HVAC system under certain operation condition, which is defined as the near-optimum operation level. DEA method is then applied to obtain the benchmarking frontier of near-optimum operation levels, and the frontier will illustrate the ideal operation level under overall operation conditions. In order …

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Numerical And Experimental Analysis Of Heat And Mass Transfer Processes On Water Trays In Household Refrigerators, Adriano Francisco Ronzoni, Cláudio Melo, Carolin Ries Jan 2014

Numerical And Experimental Analysis Of Heat And Mass Transfer Processes On Water Trays In Household Refrigerators, Adriano Francisco Ronzoni, Cláudio Melo, Carolin Ries

International Refrigeration and Air Conditioning Conference

Frost formation on the cold evaporator surface is a typical problem in household refrigerators. It happens due to humidity present in the ambient air associated with frequent door openings. In addition, mass transfer from stored goods to dry internal cabinet air and moisture infiltration through door gaskets also contribute to frost formation on the evaporator surface. To prevent this, the evaporator has to be defrosted manually or automatically (as in modern refrigerators). To do so, an electrical heater is switched on at a preset time and frequency and defrosts the evaporator. During this time, defrosted water is drained through a …

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Shape Optimization Of A Compressor Supporting Plate Based On Vibration Modes, Olavo M. Silva, Thiago M. Guesser, Igor M. Guesser, Claudio De Pellegrini, Carlos E. Vendrami, Arcanjo Lenzi Jan 2014

Shape Optimization Of A Compressor Supporting Plate Based On Vibration Modes, Olavo M. Silva, Thiago M. Guesser, Igor M. Guesser, Claudio De Pellegrini, Carlos E. Vendrami, Arcanjo Lenzi

International Refrigeration and Air Conditioning Conference

In typical household refrigeration systems, the compressor is structurally connected to the cabinet through an assembly composed of rubber mounts and a steel support plate, usually called base-plate. This plate works as a vibration energy path from the compressor to other refrigerator components, and its dynamic behavior must be known in order to avoid the coincidence of resonances and operational frequencies , a situation in which the energy flow is maximized. One way to design a support that satisfies this requirement is to optimize the shape of the plate, locating its structural modes as far as possible from the operational …

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Virtual Power Consumption And Cooling Capacity Virtual Sensors For Rooftop Units, Howard Cheung, James E. Braun Jan 2014

Virtual Power Consumption And Cooling Capacity Virtual Sensors For Rooftop Units, Howard Cheung, James E. Braun

International Refrigeration and Air Conditioning Conference

Implementation of advanced controls and diagnostic features in small commercial buildings typically requires real-time monitoring of the energy flows, such as the power consumption and cooling capacity of rooftop units. However, these measurements are expensive and therefore limit the application of these advanced features. In order to lower the measurement cost, virtual sensing technology for rooftop unit power consumption and cooling capacity are being developed. Power transmitters and thermocouples are installed on the rooftop units to train the virtual sensors. The idea is to recycle the power transmitters after training to save cost, and then the virtual sensors estimate hourly …

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Numerical Model Of Capillary Tubes: Enhanced Performance And Study Of Non-Adiabatic Effects, Nicolas Ablanque, Carles Oliet, Joaquim Rigola, Carlos David Pérez-Segarra Jan 2014

Numerical Model Of Capillary Tubes: Enhanced Performance And Study Of Non-Adiabatic Effects, Nicolas Ablanque, Carles Oliet, Joaquim Rigola, Carlos David Pérez-Segarra

International Refrigeration and Air Conditioning Conference

In this work a numerical model to simulate the thermal and fluid-dynamic phenomena inside non-adiabatic capillary tubes is presented. The model presented herein is an improved version of the distributed model detailed in [1]. It is based on a pseudo-homogeneous two-phase flow model where the governing equations (continuity, momentum, energy and entropy) are integrated over the discretized fluid domain and solved by means of a step-by-step scheme. The main novelty of the improved algorithm is its enhanced capability to address many of the convergence issues typically found in distributed models as stated by [2] and [3]. In addition, the newest …

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Transient Exergy Destruction Analysis Of A Vapor Compression System, Neera Jain, Andrew Alleyne Jan 2014

Transient Exergy Destruction Analysis Of A Vapor Compression System, Neera Jain, Andrew Alleyne

International Refrigeration and Air Conditioning Conference

Through online optimization and control, vapor compression systems (VCSs) can effectively respond to disturbances, such as weather or varying loads that cannot be accounted for at the design stage, while simultaneously maximizing system efficiency. However, to do so requires a mathematical characterization of efficiency for the VCS. In particular, we would like to maximize the exergetic efficiency of the VCS which characterizes system efficiency relative to the maximum achievable efficiency as postulated by the second law of thermodynamics. This is equivalent to minimizing the rate of exergy destruction during system operation. Furthermore, in applications where VCSs encounter high frequency disturbances, …

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Structured Pairing In A First-Year Electrical And Computer Engineering Laboratory: The Effects On Student Retention, Attitudes, And Teamwork, Nicholas D. Fila, Michael C. Loui Jan 2014

Structured Pairing In A First-Year Electrical And Computer Engineering Laboratory: The Effects On Student Retention, Attitudes, And Teamwork, Nicholas D. Fila, Michael C. Loui

School of Engineering Education Graduate Student Series

This paper describes a simple technique, structured pairing, for organizing student teams in engineering instructional laboratories. This technique was adapted from pair programming, which was previously found to improve student confidence, satisfaction, and retention in computer science. A study of structured pairing was implemented in a large required course for first-year students in electrical and computer engineering. Six laboratory sections implemented structured pairing, and the other seven laboratory sections operated in a traditional way (i.e., unstructured team interactions). Data were collected from a student survey, two focus groups, and course enrollment records. Structured pairing students reported significantly higher confidence in …

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The Role Of Design Skills In Design Review Conversations: An Analysis Using The Multiple Intelligence Framework, Newton D'Souza, Kinkini Chandrasekhara Jan 2014

The Role Of Design Skills In Design Review Conversations: An Analysis Using The Multiple Intelligence Framework, Newton D'Souza, Kinkini Chandrasekhara

Design Thinking Research Symposium

Design skills are diverse abilities intentionally used by designers to achieve desired goals in specific design scenarios. However, very little is known about how design skills are manifested, expressed or encouraged in a design review conversation. This study uses the multiple intelligence framework to map and analyze design skills of four different review conversations by the interaction between instructor, student and the clients. The findings reveal that consistency and endurance in skill application is more critical than the frequency and duration of skill application for successful design outcomes. Moreover, skill diversity and alignment of student skill-set with instructor and client …

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Annual Performance Of A Solar Assisted Heat Pump Using Ice Slurry As A Latent Storage Material, Justin Tamasauskas, Michel Poirier, Radu Zmeureanu, Martin Kegel, Roberto Sunye Jan 2014

Annual Performance Of A Solar Assisted Heat Pump Using Ice Slurry As A Latent Storage Material, Justin Tamasauskas, Michel Poirier, Radu Zmeureanu, Martin Kegel, Roberto Sunye

International High Performance Buildings Conference

Solar assisted heat pump systems offer an attractive method of reducing the energy used for space heating and cooling, while efficiently using low temperature renewable energy from the sun to reduce the degradation of heat pump performance at low ambient temperatures. However, the majority of these systems use sensible storage to bridge the gap between thermal supply and demand, with the maximum storage capacity limited by physical constraints within the building. Latent storage has the potential to significantly reduce the required tank volumes in these types of systems. Previous work has demonstrated the benefit in heating mode of combining a …

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Influence Of Approaches In Cfd Solvers On Performance Prediction In Screw Compressors, Ahmed Kovacevic, Sham Rane, Nikola Stosic, Yu Jiang, Sam Lowry, Michal Furmanczyk Jan 2014

Influence Of Approaches In Cfd Solvers On Performance Prediction In Screw Compressors, Ahmed Kovacevic, Sham Rane, Nikola Stosic, Yu Jiang, Sam Lowry, Michal Furmanczyk

International Compressor Engineering Conference

Computational Fluid Dynamics (CFD) offers insight into screw compressor designs beyond the capabilities of other conventional methods. It allows evaluation of local flow patterns which influence performance but are difficult or impossible to investigate experimentally. Implementation of CFD in these machines is challenging due to the physics of the flow, the properties of the working fluids and the complexity of flow passages which change size and position. This is additionally challenged by a lack of methodologies available to generate the meshes required for the full three dimensional transient simulations. Commercially available CFD solvers need to fully interact with customized grid …

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Modelling And Simulation Of The Dynamics Of Cross Vane Expander-Compressor Unit For Vapour Compression Cycle, Ken Shaun Yap, Kim Tiow Ooi, Anutosh Chakraborty Jan 2014

Modelling And Simulation Of The Dynamics Of Cross Vane Expander-Compressor Unit For Vapour Compression Cycle, Ken Shaun Yap, Kim Tiow Ooi, Anutosh Chakraborty

International Compressor Engineering Conference

The Cross Vane mechanism was recently invented and employed in the design and development of an expander-compressor unit, named Cross Vane expander-compressor or CVEC in short. This device replaces the compressor and expansion valve of a conventional vapour compression cycle, and improves the energy efficiency of the system. Theoretical models which include geometrical, thermodynamics, mass flow, as well as mechanical loss models are developed to characterize the performance of CVEC. Numerical simulation was performed, and the results show that the device is capable of reducing the energy consumption and the peak power requirement of the refrigeration system. Energy saving and …

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Pd Compression: A Quasi-Static Or Dynamic Process?, Paul Xiubao Huang Jan 2014

Pd Compression: A Quasi-Static Or Dynamic Process?, Paul Xiubao Huang

International Compressor Engineering Conference

Gas compression in a positive displacement (PD) type piston engine, or piston compressor, has long been modeled as a quasi-static process in which the piston is assumed to move infinitely slow inside a cylinder. The gas compression mechanism is therefore regarded as being governed by the basic thermodynamic principles. Energy transfer is accomplished quasi-statically with a piston reducing the volume a little at a time, small perturbation, while increasing gas pressure simultaneously. This is in direct contrast to a dynamic type gas compressor such as turbo compressor that achieves energy transfer by initially imparting kinetic energy to the gas and …

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Development And Validation Of Integrated Design Framework For Compressor System Model, Parag Mantri, Aditya Bhakta, Srinivas Mallampalli, Greg Hahn, Srujan Kusumba Jan 2014

Development And Validation Of Integrated Design Framework For Compressor System Model, Parag Mantri, Aditya Bhakta, Srinivas Mallampalli, Greg Hahn, Srujan Kusumba

International Compressor Engineering Conference

The performance of a refrigerator is largely guided by the efficiency of its drive unit, namely, the compressor & understanding the compressor behavior requires a detailed study of its dynamics, flow-thermals, electrical and controls aspects. Having a simulation model which captures these physics reasonably well is a critical part of the design and performance prediction of a compressor. The current paper describes a systematic approach of making a system level simulation framework by first developing individual models and then integrating them into a single framework to capture the multi-physics interaction of the different sub-components. This framework, developed in MATLAB/SIMULINK contains …

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An Approach Towards Reed Valve Geometry Design, Sandeep Dhar, Bhaskar Tamma, Aditya Bhakta, Murali Krishna Jan 2014

An Approach Towards Reed Valve Geometry Design, Sandeep Dhar, Bhaskar Tamma, Aditya Bhakta, Murali Krishna

International Compressor Engineering Conference

Pressure-actuated reed valves play an important role in the compression process of a refrigerator compressor. The material properties and geometrical parameters of the valve and geometrical properties of valve port determine the flow coefficient which in turn impacts the compressor efficiency. Also, the moving mass of the valve and its stiffness governs the transient response (valve flutter) which impacts life and reliability of the valve in operation. Therefore, it is imperative to carefully design the reed valves to maximize compressor performance while meeting the above requirements. The design of reed valves involves determining the geometrical parameters (length, width and thickness) …

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Supersonic Axial Compressor Stage Simplified Analysis, Kristina Soldatova, Yuri Galerkin Jan 2014

Supersonic Axial Compressor Stage Simplified Analysis, Kristina Soldatova, Yuri Galerkin

International Compressor Engineering Conference

Application of supersonic axial compressor stages is an effective way to decrease mass and volume of gas turbines. It is reported that stages with pressure ratio up to 2,8 and blade velocity 450 m/s can operate quite satisfactory. There is demand for stages with pressure ratio that exceeds 3.0. The possible efficiency of stages is vital for successful application. As a velocity coefficient at an impeller inlet of stages can be about 1.5 and more, shock wave losses can limit overall stage efficiency. The simplified model of a stage was used for calculations. Supersonic flow in elementary blade cascade with …

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Compressor Efficiency Improvement By Reducing Heat Transfer, Sophie Colmek Jan 2014

Compressor Efficiency Improvement By Reducing Heat Transfer, Sophie Colmek

International Compressor Engineering Conference

Many ways is possible to improve the compressor efficiency, like to reduce the mechanical losses through valve or bearing which represents from 20% to 30% of total electric consumption power on the compressor. Another ways is to decrease the pressure drop through the compression circuit of the compressor, which can reduce the temperature variation through the compressor…etc. In our case of study, we will be interested in the heat transfer and pressure drop through the suction circuit. In this paper, we present the challenge done on the heat transfer reduction through the suction line of the CAJ4519Z compressor, in reducing …

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Friction Model Development For A Reciprocating Compressor, Parag Mantri, Bhavesh Kachhia, Bhaskar Tamma, Aditya Bhakta Jan 2014

Friction Model Development For A Reciprocating Compressor, Parag Mantri, Bhavesh Kachhia, Bhaskar Tamma, Aditya Bhakta

International Compressor Engineering Conference

Friction loss has a significant impact on the performance of a reciprocating compressor. Piston-cylinder friction is a major contributor compared to the other contributors like thrust bearing, piston pin and crank. In the present work,the piston–cylinder interaction inside a small hermetic compressor is modeled using the Reynolds equation which is solved using finite difference method. The model provides key compressor design parameters such as minimum oil film thickness, oil pressure distribution between piston-cylinder, normal forces and friction power loss. The model is validated against data from published literature. Using the above formulation, different concepts have been studied & compared against …

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Loss Analysis Of Rotating Spool Compressor Based On High-Speed Pressure Measurements, Craig R. Bradshaw, Greg Kemp, Joseph Orosz, Eckhard A. Groll Jan 2014

Loss Analysis Of Rotating Spool Compressor Based On High-Speed Pressure Measurements, Craig R. Bradshaw, Greg Kemp, Joseph Orosz, Eckhard A. Groll

International Compressor Engineering Conference

A rotating spool compressor is a novel compressor technology that was recently introduced by Kemp et al. (2008). To accelerate the development of the technology, a breakdown of the key losses within the device is presented. The losses include flow losses associated with leakage and over/under compression due to valves and porting. Additionally, frictional losses associated with the key sealing elements and moving components are calculated. All of these losses are combined into Pareto of losses for the spool compressor. This Pareto identifies the dynamic sealing elements as key components to continue development on to achieve the best improvement in …

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Influence Of Volumetric Displacement And Aspect Ratio On The Performance Metrics Of The Rotating Spool Compressor, Craig R. Bradshaw, Greg Kemp, Joseph Orosz, Eckhard A. Groll Jan 2014

Influence Of Volumetric Displacement And Aspect Ratio On The Performance Metrics Of The Rotating Spool Compressor, Craig R. Bradshaw, Greg Kemp, Joseph Orosz, Eckhard A. Groll

International Compressor Engineering Conference

A theoretical study of the influence of scaling is presented for the rotating spool compressor. This study uses the previously developed comprehensive compressor model for the rotating spool compressor developed by Bradshaw and Groll (2013). Using this model a study of the influence of the compressor volumetric displacement is performed. This study relies on a set of scaling rules to determine the size of the compressor features as the compressor displacement changes. The study finds that as the volumetric displacement increases, the volumetric efficiency asymptotically increases. It is also found that there is an optimum in overall isentropic efficiency as …

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Influence Of Cylinder Bore Volume On Pressure Pulsations In A Hermetic Reciprocating Compressor, Keith Adam Novak Jan 2014

Influence Of Cylinder Bore Volume On Pressure Pulsations In A Hermetic Reciprocating Compressor, Keith Adam Novak

International Compressor Engineering Conference

Suction pressure pulsations created when the suction valve opens are caused by unsteady mass flow through the valve exciting acoustic resonances in the suction plenum. These pressure pulsations influence valve dynamics, compressor performance and compressor noise. This paper will show the importance of including the cylinder bore volume in the flow path analysis in order to accurately calculate pressure pulsations. Pressure pulsations will be calculated using Finite Element Method (FEM) calculated impedance transfer matrix method in a quasi-static solution. The method models the impedance of the suction plenum flow path including cylinder bore volume using a static geometry condition just …

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Influence Of Shell Volume On Pressure Pulsations In A Hermetic Reciprocating Compressor, Keith Adam Novak Jan 2014

Influence Of Shell Volume On Pressure Pulsations In A Hermetic Reciprocating Compressor, Keith Adam Novak

International Compressor Engineering Conference

In a hermetic reciprocating compressor the suction pressure pulsations affect compressor performance and noise. The pressure pulsations are created due to the dynamic flow of refrigerant through the suction valve into the cylinder bore. One dimensional (1D) acoustic method, Finite Element Method (FEM) calculated impedance transfer matrix method, and Computational Fluid Dynamics (CFD) are three commonly used methods to calculate these pressure pulsations. With CFD being used most often to solve this type of analysis; however CFD is often time consuming and requires significant computer resources. In order to solve the pressure pulsation analyses faster, the suction plenum geometry is …

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Effective Flow And Force Areas Of Discharge Valve In A Rotary Compressor, Qin Tan, Zhan Liu, Junming Cheng, Quanke Feng Jan 2014

Effective Flow And Force Areas Of Discharge Valve In A Rotary Compressor, Qin Tan, Zhan Liu, Junming Cheng, Quanke Feng

International Compressor Engineering Conference

In this paper, two fluid–structure interaction (FSI) models of the discharge valve are presented to study the effect of partly covering the discharge port by the cylinder and the roller on the effective flow and force areas. One is the full FSI model and another is the simplified FSI model in which the discharge port is not covered and the cylinder shape is simplified to be cylindrical. The pressure in the compression chamber, the displacement of the valve reed, the volumetric flow rate through the valve and the gas force acting on the valve reed head are obtained by the …

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New Version Of The Universal Modeling For Centrifugal Compressor Gas Dynamic Design, Kristina Soldatova, Galerkin Yuri, Drozdov Aleksandr Jan 2014

New Version Of The Universal Modeling For Centrifugal Compressor Gas Dynamic Design, Kristina Soldatova, Galerkin Yuri, Drozdov Aleksandr

International Compressor Engineering Conference

Decades ago at pre – computer era design process consisted of empirically based set of rules application to choose main flow path dimensions. Serious model tests were obligatory before compressor manufacturing to check delivery pressure and efficiency. Better flow physical models and computer progress made possible to develop quickly operating programs to predict gas dynamic performance curves of an arbitrary flow path. TU SPb set of computer programs was named “The Universal modeling method” and its application still in mid 1990th had lead to elimination of model tests in a design process of industrial centrifugal compressors. The Universal modeling state …

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Numerical Simulation Of Three-Dimension Unsteady Flow In The Compression Chambers Of A Scroll Compressor, Shuanglai Liu, Xiaoli Kang, Caixia Shan, Yusheng Hu Jan 2014

Numerical Simulation Of Three-Dimension Unsteady Flow In The Compression Chambers Of A Scroll Compressor, Shuanglai Liu, Xiaoli Kang, Caixia Shan, Yusheng Hu

International Compressor Engineering Conference

Due to the movement of orbiting scroll and leakage in scroll compressor chambers, the unsteady flow has significant influence on compression process. It's necessary to takes account of both flow and thermodynamics process in analysis of compression. This paper has carried out a numerical simulation of the whole compression process in scroll compressor, involving suction, compression and discharge process. By solving mass, momentum and energy equations of the refrigerant, the velocity, pressure and temperature distribution in all compression chambers throughout the entire compression cycle has been obtained, which takes account of all the influence of flow and thermodynamics process. The …

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Dynamic Performance Of Valve In Reciprocating Compressor Used Stepless Capacity Regulation System, Guangbin Liu, Yuanyang Zhao, Le Wang, Qichao Yang, Bin Tang, Liansheng Li Jan 2014

Dynamic Performance Of Valve In Reciprocating Compressor Used Stepless Capacity Regulation System, Guangbin Liu, Yuanyang Zhao, Le Wang, Qichao Yang, Bin Tang, Liansheng Li

International Compressor Engineering Conference

Capacity regulation system by controlling suction valve is useful for large scale reciprocating compressor in petrochemical engineering field. The dynamic performance of adjustment device influences the stability and accurancy of this system. In this paper, a mathematical model of adjustment device coupled with the motion of suction valve is built, and the dynamic performances of valve plate are simulated. The results show that the displacement of actuator increases with the hydraulic oil pressure until the valve plate is keeped to be opened. The closing process of valve plate is delayed when the hold time of actuator is larger enough. Although …

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Numerical And Experimental Examination For Oil Pump System Using A Simplified Uncoupled Simulation Model, Mauricio Pereira Tada, Thiago Hoffmann, Paulo Rogério Carrara Couto, Adilson Luiz Manke, Marcos Giovani Dropa De Bortoli Jan 2014

Numerical And Experimental Examination For Oil Pump System Using A Simplified Uncoupled Simulation Model, Mauricio Pereira Tada, Thiago Hoffmann, Paulo Rogério Carrara Couto, Adilson Luiz Manke, Marcos Giovani Dropa De Bortoli

International Compressor Engineering Conference

Compressors with variable capacity are employed in domestic applications where better performance, fine temperature control, low power consumption and low noise levels are required. This is achievable not only by the use of an electronic inverter drive capable of operating at different frequencies, but also by technology applied in mechanical, electrical, acoustic and thermodynamic subsystems, making possible to control its cooling capacity, fully meeting the product requirements. One fundamental condition of operation is to ensure proper lubrication of mechanical components, for 100% of compressors, operating throughout its speed range, ensuring full operation throughout its lifetime. To do that, several methods …

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