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Experimental Investigation On An Orc Twin-Screw Expander With An Emphasis On Its Suction Process, Yafen Tian, Chuang Wang, Fengfan Hu, Jialun Lu, Ziwen Xing Jan 2018

Experimental Investigation On An Orc Twin-Screw Expander With An Emphasis On Its Suction Process, Yafen Tian, Chuang Wang, Fengfan Hu, Jialun Lu, Ziwen Xing

International Compressor Engineering Conference

Organic Rankine Cycle (ORC) is an effective and promising technology to recover low-grade waste heat and output electricity. As a key component in an ORC system, the expander’s performance significantly affects the whole system’s efficiency. Twin-screw expander is widely employed for its compact structure, reliability, two-phase tolerance and high efficiency. To investigate the characteristics of twin-screw expander, a test bench was set up in a laboratory taking 120 waste steam as heat source. R245fa was selected as the working fluid. Pressure sensors with high sensitivity and accuracy were installed at appropriate locations in the expander casing to monitor the p-V …

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Mathematical Modelling Of The Rotor-Driven Revolving Vane Compressor With Fixed Vane (Rv-I) With Consideration Of The Vane Thickness, Alison Subiantoro, Kim Tiow Ooi Jan 2018

Mathematical Modelling Of The Rotor-Driven Revolving Vane Compressor With Fixed Vane (Rv-I) With Consideration Of The Vane Thickness, Alison Subiantoro, Kim Tiow Ooi

International Compressor Engineering Conference

The rotor-driven revolving vane compressor with a fixed vane (RV-I compressor) was introduced in 2008. It has been shown to exhibit superior mechanical performance as compared to conventional rotary compressors and the original revolving vane compressor design due to its unique cylinder-rotor arrangement. In such a machine, both the rotor and the cylinder rotate together with the help of the vane, resulting in significantly reduced frictional losses. Mathematical models had been developed and validated to simulate the characteristics of RV-I compressors. These models typically assumed negligible vane thickness to simplify the analysis. In this paper, a new mathematical model for …

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Experimental Study To Characterize Performance Of A Prototype Electrochemical Compressor, Bo Shen, Scott Fackler, Bahar Bamdad Jan 2018

Experimental Study To Characterize Performance Of A Prototype Electrochemical Compressor, Bo Shen, Scott Fackler, Bahar Bamdad

International Compressor Engineering Conference

This paper describes working mechanism of electrochemical compressor (ECC), which compresses hydrogen using electrochemical process through membranes. The electrochemical process is governed by Nernst equation. The paper documents experimental study to characterize performance of a prototype electrochemical compressor. The experimental setup is introduced and the measured results of hydrogen mass flow rate, electrochemical efficiency and isentropic compression efficiency are given. The experimental results demonstrate that the prototype compressor is able to pump hydrogen flow from 25 psia to 140 psia, and deliver the flow rate as predicted by Nernst equation. On the other hand, its efficiency level is low, having …

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Refrigerant Liquid Slugging In The Suction System Of Reciprocating Compressor, Tadeu Tonheiro Rodrigues, Sergio Koerich Lohn Jan 2018

Refrigerant Liquid Slugging In The Suction System Of Reciprocating Compressor, Tadeu Tonheiro Rodrigues, Sergio Koerich Lohn

International Compressor Engineering Conference

Liquid slugging in reciprocating compressors is highly concerning due to the exceptionally harmful effects of liquid hammering. The high pressure generated by the liquid compression leads to high stresses on the structural components, resulting many times in compressor failure. The suction muffler is a path to the compression chamber for the slugging flow, therefore its design influences the amount of liquid that reaches the compression chamber. This paper depicts the numerical study of the liquid flow in four typical muffler designs, aiming to analyze the influence of the muffler design parameters in the liquid mass flow rate reaching the compression …

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Development Of A Rotary Vane Expander For An R-22 Heat Pump System, Vishal Vishal, Wanqing Xia, Alison Subiantoro Jan 2018

Development Of A Rotary Vane Expander For An R-22 Heat Pump System, Vishal Vishal, Wanqing Xia, Alison Subiantoro

International Compressor Engineering Conference

A traditional vapour compression refrigeration system consists of a compressor, a condenser, a throttling device and an evaporator. The typical throttling devices are capillary tube and expansion valves. Unfortunately, such devices waste expansion energy. To overcome this issue, expanders have been proposed in recent years. An expander can be observed as a compressor operating in a reversed cycle. It expands fluid and produces power which could be used to supply energy to the compressor or other components. The expansion process is more gradual, unlike that in typical throttling devices. Naturally, an expander is most attractive and has been studied most …

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Cfd Modelling Of A Twin Screw Expander Using A Single Domain Rotor Grid, Apostolos Karvountzis-Kontakiotis, Gursharanjit Singh, Ahmed Kovacevic, Sham Ramchandra Rane Jan 2018

Cfd Modelling Of A Twin Screw Expander Using A Single Domain Rotor Grid, Apostolos Karvountzis-Kontakiotis, Gursharanjit Singh, Ahmed Kovacevic, Sham Ramchandra Rane

International Compressor Engineering Conference

Organic Rankine cycle (ORC) is widely recognized as a viable technology to convert low temperature heat into electricity. Compared to other emerging technologies, ORC systems have a number of advantages such as low maintenance, favourable operating pressures and autonomous operation. Among the ORC components, selection of the appropriate expander and working fluid affects the overall cycle’s efficiency, size and cost. Expanders are classified into dynamic and positive displacement machines. Twin screw expanders belong to the latter group and compared to other expanders have the advantage of high isentropic efficiency (up to 70%), high pressure ratios (typically 2-10), simple structure, potential …

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Research On Low Frequency Noise Caused By Beat Vibration Of Rotary Compressor, Hui Shen, Xiaoqiang Huang, Zhiqiang Deng, Lichang Xie, Haishui Jin Jan 2018

Research On Low Frequency Noise Caused By Beat Vibration Of Rotary Compressor, Hui Shen, Xiaoqiang Huang, Zhiqiang Deng, Lichang Xie, Haishui Jin

International Compressor Engineering Conference

The discontinuity of low frequency noise caused by beat frequency vibration of rotary compressor is studied in this paper. Based on beat frequency theoretical analysis, a finite element model is established to simulate the electromagnetic harmonics. And the contributions of various compressor motor designs to beat frequency vibration are investigated, so the motor optimization design schemes are obtained. The tests show that the method proposed in the paper is effective to improve low frequency noise of the compressor.

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Development Of Large Capacity 3d Scroll Compressor For First Stage Of Two-Stage Compression System, Masahiro Taniguchi, Hajime Sato, Yogo Takasu, Yoshiyuki Kimata Jan 2018

Development Of Large Capacity 3d Scroll Compressor For First Stage Of Two-Stage Compression System, Masahiro Taniguchi, Hajime Sato, Yogo Takasu, Yoshiyuki Kimata

International Compressor Engineering Conference

Large capacity scroll compressor was developed for first stage of two-stage compression system. The developed compressor has larger displacement volume than our current models with same external dimension of compressor. Compressor with larger displacement volume has advantages to larger cooling capacity and less mechanical loss under the same cooling capacity because of less rotation speed. Also, extension of compressor capacity will be advantageous for application of low GWP refrigerants including HFOs, which are attracting attention recently, because they generally have low densities compared to current HFCs. To extend displacement volume, the authors adopted three dimensional compression mechanism (3D scroll) which …

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Numerical And Experimental Research Of Noise Reduction Due To Low Frequency Pressure Fluctuation Of Rotary Compressor, Chaole Zhang, Zhiqiang Deng, Hui Shen, Lichang Xie, Haishui Jin Jan 2018

Numerical And Experimental Research Of Noise Reduction Due To Low Frequency Pressure Fluctuation Of Rotary Compressor, Chaole Zhang, Zhiqiang Deng, Hui Shen, Lichang Xie, Haishui Jin

International Compressor Engineering Conference

In order to reduce the noise level due to the low frequency pressure fluctuation associated with a rotary compressor, the noise mechanism and noise reduction solutions were conducted by using numerical and experimental methods. A 1D simulation model was established and a sensitivity analysis was conducted for the parameters associated with the low frequency pressure fluctuation of the rotary compressor. Then, a 3D CFD simulation model corresponding to the operation procedure of the rotary compressor was established and the working process of the rotary compressor was simulated. At the same time, the low frequency pressure fluctuation and the noise spectral …

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Machine Learning Applied To Positive Displacement Compressors And Expanders Performance Mapping, Davide Ziviani, Ammar M. Bahman, Nelson A. James, Dominique Lumpkin, James E. Braun, Eckhard A. Groll Jan 2018

Machine Learning Applied To Positive Displacement Compressors And Expanders Performance Mapping, Davide Ziviani, Ammar M. Bahman, Nelson A. James, Dominique Lumpkin, James E. Braun, Eckhard A. Groll

International Compressor Engineering Conference

Positive displacement compressors are critical components in today’s vapor compression refrigeration, air conditioning, and heat pumping applications and can also be applied as expanders in power generation systems, such as organic Rankine cycles (ORC). The simulation of such systems is essential to predict and optimize the performance behavior at full- and part-load conditions. To this end, comprehensive system models are built by including different sub-models corresponding to each cycle component (e.g., heat exchangers, compressor, linesets). In general, the higher the complexity of each sub-models utilized to capture the physics, the higher the computational time required to solve a simulation run. …

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Performance Analysis Of Internally Geared Positive Displacement Machines, Matthew Read, Nikola Stosic, Ian Smith Jan 2018

Performance Analysis Of Internally Geared Positive Displacement Machines, Matthew Read, Nikola Stosic, Ian Smith

International Compressor Engineering Conference

Internally geared positive displacement machines consist of an externally lobed inner rotor rotating inside an internally lobed outer rotor. The rotors can have a constant profile along their length and rotate about parallel axes. Relative to the axis of rotation, the lobes of the rotors can either be straight (as found in conventional gerotor type machines), or helical (as previously proposed by the authors). In either case, the profiles must be specified in order to maintain continuous contact points between the rotors to maintain sealed working chambers. The use of stationary ported plates located at both end faces of the …

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Study On The Scroll Compressors Used In The Air And Hydrogen Cycles Of Fcvs By Cfd Modeling, Qingqing Zhang, Jianmei Feng, Jie Wen, Xueyuan Peng Jan 2018

Study On The Scroll Compressors Used In The Air And Hydrogen Cycles Of Fcvs By Cfd Modeling, Qingqing Zhang, Jianmei Feng, Jie Wen, Xueyuan Peng

International Compressor Engineering Conference

Fuel cell vehicles (FCVs) have become a research hotspot because of the continuous increase in transportation needs, energy needs, and environmental issues. However, several challenges must be overcome to be competitive with conventional vehicles. The performance of air and hydrogen cycles depends on compressors. It is a key issue to guarantee the efficiency and reliability of FCVs. In this paper, the working conditions of hydrogen and air scroll compressors in FCVs were described in details. 3D transient CFD numerical simulations with dynamic meshing of the air scroll compressor and the hydrogen compressor/pimp were presented. The performance of scroll compressors in …

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Analysis Of Variable Speed Vapor Injection Scroll Compressors Working With Several Refrigerants: Empirical Correlation For The Characterization And Optimization Of The Intermediate Conditions, Fernando M. Tello Oquendo, Emilio Navarro-Peris, José Gonzálvez-Maciá Jan 2018

Analysis Of Variable Speed Vapor Injection Scroll Compressors Working With Several Refrigerants: Empirical Correlation For The Characterization And Optimization Of The Intermediate Conditions, Fernando M. Tello Oquendo, Emilio Navarro-Peris, José Gonzálvez-Maciá

International Compressor Engineering Conference

Vapor-injection scroll compressors (SCVI) are present in the market since many years. There are several studies in the literature dealing with their proper characterization and the development of correlation in order to estimate properly its intermediate working conditions. The main objective of these correlations is the prediction of the compressor behavior for any condition based on a reduced number of test. Derived from that a correlation would be better as less parameter it will require, as this will imply less number of test in order to determine it. Nowadays, variable speed SCVI are being installed more widely but not so …

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From Cad To 1d: A Direct Approach To Modeling Scroll Compressors With Multi-Physics Simulation, Jonathan Nicholas Harrison, Steven Koester, Rodrigo Aihara, David Ratner Jan 2018

From Cad To 1d: A Direct Approach To Modeling Scroll Compressors With Multi-Physics Simulation, Jonathan Nicholas Harrison, Steven Koester, Rodrigo Aihara, David Ratner

International Compressor Engineering Conference

Modeling scroll compressors with 1D fluid dynamics often involves the time-consuming exercise of calculating chamber volume and port areas vs. crank angle either manually from CAD or through scripting. In a novel approach, GT-SUITE simulation software is used starting from the original CAD model of the scroll fixed and orbiting involutes to create a 1-dimensional fluid dynamic model automatically. This allows models to be built in minutes while preserving the true CAD geometry. The process of calculating the chamber volume, port area, leakages, and areas required to convert chamber gas pressure to forces/moments on the orbiting scroll will be presented. …

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Analysis Of High Frequency Noise Of Inverter Rotary Compressor, Wanjie Sun, Yong Wang, Hui Shen, Yonggui Li, Lichang Xie Jan 2018

Analysis Of High Frequency Noise Of Inverter Rotary Compressor, Wanjie Sun, Yong Wang, Hui Shen, Yonggui Li, Lichang Xie

International Compressor Engineering Conference

The inverter compressor driven by the inverter will cause high frequency noise, which will have adverse influence on total noise value and sound quality. In order to improve this problem, an existing compact rotary inverter compressor is studied in this paper. The influence law of inverter carrier wave of space vector pulse width modulation(SVPWM) technique on motor vibration and noise of compressor is analyzed and summarized. Combining order analysis and motor modal analysis, the results show that the high harmonic current induced by inverter carrier wave will produce high frequency electromagnetic force which excites the stator resonance, and finally results …

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Pressure Pulsation In The Reciprocating Compressor With Stepless Capacity Regulation, Lanlan Yang, Wenkai Wang, Xiaohan Jia, Xueyuan Peng Jan 2018

Pressure Pulsation In The Reciprocating Compressor With Stepless Capacity Regulation, Lanlan Yang, Wenkai Wang, Xiaohan Jia, Xueyuan Peng

International Compressor Engineering Conference

The stepless capacity regulation by means of delayed closure of the suction valves plays an important role in energy conservation for the reciprocating compressor. Serious gas pulsation usually occurs during the capacity regulation, and its analysis and suppression is a challenge due to the varied components of the pulsation excitation under different conditions. This paper presents a numerical and experimental study of the gas pulsation in the compressor piping with stepless capacity regulation. An approach was proposed to calculate the pulsation excitation in the case of stepless capacity regulation, which was further incorporated into the frequency-domain modeling of the gas …

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Horizontal Revolving Piston Rotary Compressor With Stationary C'Shaft For Combine Condenser/Generator Unit, Nelik Dreiman Jan 2018

Horizontal Revolving Piston Rotary Compressor With Stationary C'Shaft For Combine Condenser/Generator Unit, Nelik Dreiman

International Compressor Engineering Conference

HORIZONTAL REVOLVING PISTON ROTARY COMPRESSOR WITH STATIONARY CRANKSHAFT FOR COMBINE CONDENSER/GENERATOR UNIT Dr. Nelik Dreiman Consultant, P.O.Box 144, Tipton, MI 49287 USA E-mail: [email protected] Abstract A compact, space saving condenser/generator unit has been developed by combining a radially integrated horizontal revolving piston rotary compressor/ electric motor structure with an axially spaced condenser/cooling fan structure. A dual drive mechanism of the combine unit permits to operate it in generating mode when a motive power supplied by an external mechanical force, or utilize an electric motor mode to run the unit when an electric power is available. The revolving piston rotary compressor …

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Vibration Analysis Of Twin-Screw Compressors Under Partial Load Design: A Case Study, Leila Bakhtiaryfard, Shi-Xian Chen, Yu-Ren Wu, Sheng-Hung Hsieh, Yu-Hua Huang Jan 2018

Vibration Analysis Of Twin-Screw Compressors Under Partial Load Design: A Case Study, Leila Bakhtiaryfard, Shi-Xian Chen, Yu-Ren Wu, Sheng-Hung Hsieh, Yu-Hua Huang

International Compressor Engineering Conference

In the practical operation, twin-screw refrigerant compressors may suffer the partial load for a longer period than the full load, while different working condition leads to different response of noise and vibration on the compressor. In this paper, a new approach has been proposed to assess the vibration of a twin-screw refrigeration compressor under 25%, 50%, 75% and 100% load conditions. A powerful computational fluid dynamic (CFD) software, CFX, coupled with a professional grids generation software, TwinMesh, has been used to simulate the rotor loads and p-V indicator diagram which are then checked by the compressor manufacturer’s machine type selection …

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A Comparison Of Thermal Deformation Of Scroll Profiles Inside Oil-Free Scroll Vacuum Pump And Compressor Via Cae/Cfd Analysis, Sheng-Hung Hsieh, Jin-Wei Zhang, Szu-Pei Chou, Chi-Shun Huang Jan 2018

A Comparison Of Thermal Deformation Of Scroll Profiles Inside Oil-Free Scroll Vacuum Pump And Compressor Via Cae/Cfd Analysis, Sheng-Hung Hsieh, Jin-Wei Zhang, Szu-Pei Chou, Chi-Shun Huang

International Compressor Engineering Conference

Scroll machine is simply constructed by fixed and orbit scrolls, rotary shaft, and some mechanical components. It can impressively operate at low noise level with high reliability and high efficiency. Scroll machine achieves oil-free application through reasonable clearance control, cooling solution, and the tip seal application, and has been designed and applied as vacuum pump or compressor. In order to compactly design structure and optimize the gaps or clearances of a scroll machine, the issue of heat deformation must be considered. Deformation inside a scroll machine is not easy to be discovered, but is the necessary information for scroll profile …

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Experimental Investigations On Pneumatically Forced Actuated Compressor Valves, Christian Stoeckel, Christiane Thomas, Ullrich Hesse Jan 2018

Experimental Investigations On Pneumatically Forced Actuated Compressor Valves, Christian Stoeckel, Christiane Thomas, Ullrich Hesse

International Compressor Engineering Conference

The forced actuation of usually self-acting valves inside reciprocating compressors offers the possibility of a step-less capacity control and therewith the opportunity of energy savings. Differently from nowadays typically used electromagnetic actuated grippers for forced opening of the suction valve, the present paper deals with the pneumatically forced opening of the discharge valve. Pressure, which is provided by the compressor itself, is directly applied to the valves sealing elements to apply the opening force. Only few external energy and effort is necessary. The working principle and the numerical observation on the system was presented in former papers. The actual paper …

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Cfd Analysis Of Oil Distribution In Oil-Injected Screw Compressor, Jin-Wei Zhang, Sheng-Hung Hsieh, Chi-Shun Huang Jan 2018

Cfd Analysis Of Oil Distribution In Oil-Injected Screw Compressor, Jin-Wei Zhang, Sheng-Hung Hsieh, Chi-Shun Huang

International Compressor Engineering Conference

Oil-injected screw compressor has been used in various industries. After decades of continuous research efforts by research teams around the world, the computer tools for rotor profile design, thermodynamic analysis, CFD/CAE calculation, and moving grid generation have been well developed and widely employed in design works. With assistance from the computer tools in performance simulation, designers could clearly understand internal phenomena of a screw compressor, as a reference for performance optimization design, and systematically carry out research works. One important issue inside an oil-injected screw compressor is about oil distribution. Different oil-injected positions and quantities cause different oil distribution inside …

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P-V Diagram Measurement Of A Variable Speed Rotary Compressor With Large Displacement, Yang Qian, Li Zhang, Xia Zhang, Zheqiang Ying Jan 2018

P-V Diagram Measurement Of A Variable Speed Rotary Compressor With Large Displacement, Yang Qian, Li Zhang, Xia Zhang, Zheqiang Ying

International Compressor Engineering Conference

In order to deeply understand the internal thermodynamic process of a variable speed rotary compressor with large displacement, the P-V diagram was measured as an important way to analyze efficiencies of the compressor. A testing compressor was modified for measurement of the internal dynamic pressure and performance. The compressor was tested under different operating conditions, and the P-V diagram was finally obtained. Based on the test results, efficiencies of the compressor can be estimated accurately, which could be used to optimize the compressor structure parameters.

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Stainless Steel Valves With Enhanced Fatigue And Corrosion Performance Through Microstructure Optimization, Araz Ardehali Barani, Karen Geiger, Manfred Haggeney, Giuseppe La Paglia, Lasse Langner, Thomas Wegler Jan 2018

Stainless Steel Valves With Enhanced Fatigue And Corrosion Performance Through Microstructure Optimization, Araz Ardehali Barani, Karen Geiger, Manfred Haggeney, Giuseppe La Paglia, Lasse Langner, Thomas Wegler

International Compressor Engineering Conference

In order to increase the energy efficiency of refrigerators, compressors, incorporating valves with new geometries have been developed over the past few years. In addition, higher stresses are increasingly placed upon the valve itself during operation. Hence, higher demands are set on the steel strip used to produce such valves. Today, compressor valves for refrigerators are mainly manufactured from hardened and tempered martensitic stainless steels. The main design criterion for the material selection is the endurance limit of the material under bending. However, impact loads and corrosive atmospheres often act additionally on the valve. To fulfil the increased demands for …

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Concentration Measurement Of Refrigerant/Lubricant Mixture, Pierre Ginies, Yann Even, Quentin Guesnay Jan 2018

Concentration Measurement Of Refrigerant/Lubricant Mixture, Pierre Ginies, Yann Even, Quentin Guesnay

International Compressor Engineering Conference

The solubility of refrigerants in the lubricant is a key factor for the life time of a compressor. The new Low Global Warming Potential (LGWP) refrigerants are showing generally higher solubility in lubricants than usual refrigerants. It is important to compare the dilution changes in the oil sump during compressor operation due to refrigerants properties. Sampling is a measurement method commonly used to measure dilution in working compressor but can be time consuming and it disturbs the system behavior. Additional security precautions need to be taken when sampling flammable refrigerant. This paper presents a measurement method based on the permittivity …

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Rolling Bearings Lubricated With Refrigerant, Rudolf Hauleitner, Guillermo E. Morales-Espejel, Ralph Meeuwenoord, Magnus Arvidsson Jan 2018

Rolling Bearings Lubricated With Refrigerant, Rudolf Hauleitner, Guillermo E. Morales-Espejel, Ralph Meeuwenoord, Magnus Arvidsson

International Compressor Engineering Conference

Oil-free systems gain increased popularity in the chiller industry. This technology is often related to reduced maintenance, higher system efficiency and smaller environmental footprint. In refrigeration compressors which use oil for the lubrication it is impossible to avoid mixing of refrigerant and oil in the system. The system efficiency is affected by the contamination of the refrigerant by oil. One possibility to operate a compressor of a chiller without oil is the pure refrigerant lubrication (PRL) bearing technology. With this technology the traditional oil lubrication system can be removed completely and the bearings are lubricated only with refrigerant. This removes …

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Topics On The Reliability Of Polymeric Parts In Hermetic Compressors, Rinaldo Puff, Felipe Darabas Rzatki, Guilherme Espindola Jan 2018

Topics On The Reliability Of Polymeric Parts In Hermetic Compressors, Rinaldo Puff, Felipe Darabas Rzatki, Guilherme Espindola

International Compressor Engineering Conference

Polymers have been increasingly used in engineering parts along the last years. This trend can be explained by the several advantages of this type of materials as low weight, high damping, low friction, molding flexibility and the continuous development of novel grades presenting higher mechanical strength and thermal stability. These advantages are also important in the refrigeration field, mostly inside particularly in hermetic compressors. However, the thermo chemical environment inside these machines may be excessively harsh for most of the commercially available polymers. In this context, the development of reliable parts is very challenging but not impractical. Recently, a novel …

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Air Cooling Analysis For Oil-Free Co2 Reciprocating Compressor, De Xiang Chen Jan 2018

Air Cooling Analysis For Oil-Free Co2 Reciprocating Compressor, De Xiang Chen

International Compressor Engineering Conference

It is critical to limit cylinder wall temperature for oil-free reciprocating compressor to work properly and reliably. The purpose of this paper is to show how to obtain cylinder wall temperature in oil-free reciprocating compressor design. Temperature field of a two stage oil-free CO2 reciprocation compressor with air cooling is computed numerically by two-way FSI simulation with conjugate heat transfer. Air flow around the compressor and heat conduction in the compressor are computed by 3D CFD code and FEA code respectively. Heat information is transferred between the two codes at FSI interface which is the compressor outside surface. The numerical …

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Study On Mechanism And Improvement Of Triple Frequency Noise Of Rotary Compressor, Shupeng Tan, Binsheng Zhu, Jiahui Wu, Peng Qin, Rongjun Ye, Huaming Li, Bo Jiang Jan 2018

Study On Mechanism And Improvement Of Triple Frequency Noise Of Rotary Compressor, Shupeng Tan, Binsheng Zhu, Jiahui Wu, Peng Qin, Rongjun Ye, Huaming Li, Bo Jiang

International Compressor Engineering Conference

With the continuous improvement of social life, people have more stringent noise requirements for home air conditioners. As the kernel of an air conditioner, compressor provides power for the whole system, inevitably generating vibration and noise. Therefore, Reducing the vibration and noise of the compressor is great significance for the noise reduction of the air conditioner. Generally, vibration is mainly transferred through the suction and exhaust pipes to the air conditioning pipe system. However, due to the complicated configuration, there are intensive modals for the pipe system, especially those in low frequency range, which may lead to resonance and large …

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Simulation Of The Superheated Water Expansion Process In A Cylinder With Moving Piston, Qi Wang, Zhao Zhang, Weifeng Wu Jan 2018

Simulation Of The Superheated Water Expansion Process In A Cylinder With Moving Piston, Qi Wang, Zhao Zhang, Weifeng Wu

International Compressor Engineering Conference

The Trilateral cycle has attracted more and more attentions because of its better temperature profiles matching in the heater compared to conventional heat recovery cycles, such as the Organic Rankine Cycle and the Kalina Cycle. However, the actual fundamentals of the two-phase expansion process have not been clarified, especially, the evolution mechanisms of the evaporating rate and the degree of superheat during the expansion process are indistinct. In the present study, two-phase expansion process of superheated water in a cylinder with moving piston was analyzed. A model was proposed to calculate the evaporating rate and the degree of superheat of …

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Three-Dimensional Cfd Modelling Of A Roots Blower For Hydrogen Recirculation In Fuel Cell System, Linfen Xing, Yongning He, Jie Wen, Xueyuan Peng Jan 2018

Three-Dimensional Cfd Modelling Of A Roots Blower For Hydrogen Recirculation In Fuel Cell System, Linfen Xing, Yongning He, Jie Wen, Xueyuan Peng

International Compressor Engineering Conference

Fuel cell system has gained extensive attention due to increasing tendency of environmental protection, and Roots blower has great potential as the recirculation pump in its hydrogen recirculation system while there are rare of research about this ancillary component. In this paper, a three-dimensional, transient model of a three-lobe Root pump was established and solved and the internal flow characteristic was investigated. The results show that pressure ratio can influence the mass flow rate and torque significantly and high pressure ratio will lead to mass flow reflux. The most dramatic variation of pressure occurs in the moment that the displacement …

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