Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Social and Behavioral Sciences (11652)
- Library and Information Science (8976)
- Engineering (6334)
- Physical Sciences and Mathematics (2869)
- Arts and Humanities (2755)
-
- Civil and Environmental Engineering (2550)
- Computer Sciences (2078)
- Education (1985)
- Civil Engineering (1879)
- Life Sciences (1671)
- Comparative Literature (1407)
- Communication (854)
- Medicine and Health Sciences (725)
- Rhetoric and Composition (696)
- Feminist, Gender, and Sexuality Studies (680)
- American Studies (667)
- Film and Media Studies (638)
- Mechanical Engineering (619)
- European Languages and Societies (607)
- Reading and Language (606)
- Critical and Cultural Studies (594)
- Agriculture (586)
- Other Arts and Humanities (585)
- Psychology (552)
- Plant Sciences (547)
- Nanoscience and Nanotechnology (541)
- Theatre and Performance Studies (539)
- Other Film and Media Studies (522)
- Television (509)
- Business (489)
- Keyword
-
- Applied sciences (587)
- Comparative literature (498)
- comparative literature (488)
- Comparative cultural studies (303)
- comparative cultural studies (297)
-
- Education (221)
- Social sciences (205)
- Biological sciences (195)
- Information literacy (170)
- Pure sciences (160)
- Cultural studies (156)
- Simulation (154)
- Vegetables (153)
- cultural studies (152)
- Variety trials (147)
- Literary theory (136)
- literary theory (135)
- Construction (120)
- Optimization (118)
- Health and environmental sciences (117)
- Sustainability (107)
- CFD (95)
- Safety (94)
- Economics (93)
- Problem-based learning (92)
- Zea mays (92)
- Modeling (90)
- Mechanics (87)
- Concrete (86)
- Climate change (85)
- Publication Year
- Publication
-
- Against the Grain (7173)
- Purdue Road School (3846)
- International Compressor Engineering Conference (2764)
- International Refrigeration and Air Conditioning Conference (2681)
- Open Access Dissertations (2120)
-
- JTRP Technical Reports (1908)
- Department of Computer Science Technical Reports (1777)
- Open Access Theses (1616)
- CLCWeb: Comparative Literature and Culture (1418)
- Proceedings of the IATUL Conferences (1358)
- Historical Documents of the Purdue Cooperative Extension Service Archive (1121)
- Department of Physics and Astronomy Faculty Publications (1038)
- The Writing Center Journal (1028)
- Charleston Library Conference (939)
- The Summer Undergraduate Research Fellowship (SURF) Symposium (884)
- Department of Electrical and Computer Engineering Technical Reports (747)
- The Journal of Purdue Undergraduate Research (683)
- Society of Engineering Science 51st Annual Technical Meeting Archive (652)
- First Opinions, Second Reactions (609)
- CIB Conferences (503)
- International High Performance Buildings Conference (495)
- LARS Symposia (491)
- Birck and NCN Publications (488)
- Education and Culture (431)
- International Conference on Durability of Concrete Structures (359)
- CTRC Research Publications (353)
- Libraries Faculty and Staff Scholarship and Research (294)
- Midwest Vegetable Trial Reports (289)
- Publications of the Ray W. Herrick Laboratories (286)
- Journal of Southeast Asian American Education and Advancement (275)
- Publication Type
Articles 11401 - 11430 of 50131
Full-Text Articles in Entire DC Network
An Indicated Loss Analysis Of A Light-Commercial Spool Compressor Using High-Speed Pressure Measurements, Craig Bradshaw, Greg Kemp, Joe Orosz, Eckhard A. Groll
An Indicated Loss Analysis Of A Light-Commercial Spool Compressor Using High-Speed Pressure Measurements, Craig Bradshaw, Greg Kemp, Joe Orosz, Eckhard A. Groll
International Compressor Engineering Conference
An analysis of the indicated and frictional losses is presented for a light-commercial prototype spool compressor. The spool compressor prototype was instrumented with four high-speed pressure sensors, three in the compression process and one in the discharge valve plenum. These sensors were triggered with a high-fidelity rotary encoder attached to the compressor motor shaft. This coupling of rotational position and pressure measurements allowed the development of an indicator (pressure v. volume) diagram for the compression process. Additionally, the added sensor in the discharge valve plenum allowed for a de-coupling of discharge valve losses and flow losses within the discharge plenum …
Numerical Simulation Of Aerodynamic Noise Of Soundproof Enclosure Of Air Compressor Unit, Yidan Cui, Dongping He, Huagen Wu, Wen Ying, Hao Huang
Numerical Simulation Of Aerodynamic Noise Of Soundproof Enclosure Of Air Compressor Unit, Yidan Cui, Dongping He, Huagen Wu, Wen Ying, Hao Huang
International Compressor Engineering Conference
During the operation of the air compressor unit, the suction and exhaust process of the air compressor and the operation of other equipment will cause air flow pulsation, which is often accompanied by the generation of air compressor noise. Numerical simulation method, as an important means to study the flow field characteristics and noise characteristics of air compressors, has been widely used in recent years. This article takes the noise enclosure of a certain air compressor unit as the research object, and use numerical simulation method to study the air intake part of the enclosure. The influence of inlet louver …
Free Piston Compressor With A Variable Volume Ratio: Insights On Modeling Approach And Control Strategy, Sergei Gusev, Heinz Vervaeke, Davide Ziviani, Michel De Paepe
Free Piston Compressor With A Variable Volume Ratio: Insights On Modeling Approach And Control Strategy, Sergei Gusev, Heinz Vervaeke, Davide Ziviani, Michel De Paepe
International Compressor Engineering Conference
Increasing requirements to heat pump performance ratings as well as pressing environmental concerns force manufacturers to evaluate the potential of natural refrigerants such as ammonia, propane or carbon dioxide, and implement advanced cycle architectures. Beside the use of the appropriate working fluid, the compressor should have ideally an optimal built-in volume ratio (BVR) for any pressure ratio during its operation. Practically, such mode of operation is only possible if the BVR can be made adjustable in real time in order to follow pressure fluctuations due to possible variable heat pump loads. The concept of such a machine with an embedded …
Effects Of Gas Compressibility And Piston Secondary Motion On Leakage In The Piston-Cylinder Clearance Of Reciprocating Compressors, Vitor M. Braga, Cesar J. Deschamps
Effects Of Gas Compressibility And Piston Secondary Motion On Leakage In The Piston-Cylinder Clearance Of Reciprocating Compressors, Vitor M. Braga, Cesar J. Deschamps
International Compressor Engineering Conference
Leakage can significantly affect the performance of low-capacity reciprocating compressors, reducing the mass flow rate and increasing energy consumption. In reciprocating compressors, leakage takes place mainly in the piston-cylinder clearance and is brought about by the piston motion and pressure difference between the compression chamber and the shell internal environment. This paper reports a numerical analysis of leakage in the piston-cylinder clearance of a low-capacity reciprocating compressors based on the Reynolds equation for compressible fluid flow. A simulation model is developed and applied throughout the compression cycle to assess the effect of the clearance geometry, piston velocity and piston secondary …
Vane Slot Deformation Research Of Rotary Compressor In Accumulator Welding Process, Licheng Zheng, Hongjun Cao, Binsheng Zhu, Bo Jiang
Vane Slot Deformation Research Of Rotary Compressor In Accumulator Welding Process, Licheng Zheng, Hongjun Cao, Binsheng Zhu, Bo Jiang
International Compressor Engineering Conference
Commonly accumulator in rotary compressor is connected to main case by welding, which is space-saving and of high reliability, while big deformation of cylinder’s vane slot is usually resulted in to affect reliability and COP of compressor. Welding is a complex process including combustion, heat, structure, and so on. In this paper vane slot deformation in accumulator welding process was researched by both simulations and experiments. Firstly, oxyacetylene flame was simulated, and the temperature at different position of the flame was tested to adjust the parameters in the model. Secondly, heating procedure of accumulation welding was simulated to get the …
Experimental Investigation Of A Horizontal Hermetic Scroll Compressor With Novel Oil Circuit Design, Jie Wen, Chang Liu, Xueyuan Peng
Experimental Investigation Of A Horizontal Hermetic Scroll Compressor With Novel Oil Circuit Design, Jie Wen, Chang Liu, Xueyuan Peng
International Compressor Engineering Conference
Owing to its reliable operation and low maintenance requirement, the scroll compressor has a potential application for oil and gas industry, e.g. the natural gas production for gas wells with low production and boil-off-gas recovery for gasoline filling stations. Though millions of scroll compressors are put into the refrigeration and air conditioning market each year, a much smaller number of such equipments have been used in the field of oil and gas production. This should be attributed to much larger quantity of compression heat for the natural gas compressor due to higher pressure ratio and larger isentropic exponent, which can …
A Piezoactuated Micro Diaphragm Compressor With A Hydraulic Drive, Dr. Yuanlin Hu, Wen Wang
A Piezoactuated Micro Diaphragm Compressor With A Hydraulic Drive, Dr. Yuanlin Hu, Wen Wang
International Compressor Engineering Conference
A low volumetric efficiency and low actuation force are the two disadvantages of a diaphragm-type piezoactuated micro compressor. A hydraulic drive was introduced to the micro compressor for the sake of improving its volumetric efficiency and actuation force. The hydraulic oil was driven by the piezoactuator and transferred the actuation force to a flexible diaphragm, which compressed the fluid in a domed cavity. Analytical solution was derived to predict the performance (pressure rise and flow rate) of the micro compressor. The solution included large deflections of a flexible diaphragm under a uniform pressure load and non-linear deflections of a diaphragm-type …
Design And Validation Of An Adjustable Dynamic Vibration Absorber For Piping Vibration Suppression In Skid Mounted Compressor Unit, Chang Liu, Jie Ni, Jie Wen, Xueyuan Peng
Design And Validation Of An Adjustable Dynamic Vibration Absorber For Piping Vibration Suppression In Skid Mounted Compressor Unit, Chang Liu, Jie Ni, Jie Wen, Xueyuan Peng
International Compressor Engineering Conference
The vibration control for a reciprocating compressor as well as piping has always been a challenge. Because of compact installation and limited space for the skid mounted compressor unit, it is difficult to arrange a piping support freely or change the piping layout. A new type of adjustable dynamic vibration absorber (DVA), consisting of an annular clamp and several discrete spring-mass systems (DVA subsystem), was proposed to solve this problem. The spring-mass system of this new DVA used the electromagnet and leaf spring equipped with linear slideway, which permitted continuous adjustment of the DVA’s natural frequency by means of variation …
A Feature Extraction Method Based On Lmd And Its Application For Fault Diagnosis Of Reciprocating Compressor Annular Valve, Yue Shu, Qian Zhang, Chuandong Xie, Le Wang, Zegang Qian
A Feature Extraction Method Based On Lmd And Its Application For Fault Diagnosis Of Reciprocating Compressor Annular Valve, Yue Shu, Qian Zhang, Chuandong Xie, Le Wang, Zegang Qian
International Compressor Engineering Conference
Taking the reciprocating compressor annular valve as the research object, the vibration signal of the reciprocating compressor ring valve was tested by the accelerometer vibration sensor. Through local mean decomposition (LMD), several PF components corresponding to the signal were obtained, The three characteristic parameter factors of these PF components are extracted, including the skewness coefficient (gi), kurtosis coefficient (qi) and total energy ratio (Ei/E). Then the valve is damaged to varying degrees, including sawing the valve plate, removing some springs from the valve and drilling the valve plate, the same analysis on the operating vibration signal of the damaged valve …
Measurement Of Clearance Around Bush In Swing Compressor By Visualization Of Behavior, Kosuke Nishimura, Hideki Matsuura, Shinji Tanaka
Measurement Of Clearance Around Bush In Swing Compressor By Visualization Of Behavior, Kosuke Nishimura, Hideki Matsuura, Shinji Tanaka
International Compressor Engineering Conference
A swing compressor is mainly used for residential air conditioning. Compared with a rotary compressor, the swing compressor has the features that a piston is integrated with a vane and a roller, and that the piston is supported with a pair of bushes. The bushes of the swing compressor is important sliding parts which influence the performance and reliability of the compressor and it is required to clarify the behavior during the actual operation for higher performance and reliability. The pair of bushes has four sliding surfaces that are a suction cylinder side, a suction blade side, a discharge cylinder …
Friction Properties Of Journal Bearing Having Bell-Mouth Geometry, Yoshinori Ishida, Naoya Nakashima, Hatsuhiko Usami
Friction Properties Of Journal Bearing Having Bell-Mouth Geometry, Yoshinori Ishida, Naoya Nakashima, Hatsuhiko Usami
International Compressor Engineering Conference
The present study describes the applicability of a bell-mouth geometry to the improvement of the tribological properties of journal bearings of reciprocating compressors for home appliance products such as refrigerators. A roller burnishing process was used to apply the bell-mouth geometry to the edge of cast iron journal bearings. The resulting geometry of the edge consisted of a micro-scale gradient of 1/1000 and a length of 4-6 mm. The tribological properties were evaluated at a constant sliding speed under lubricated conditions, using a specially-developed testing apparatus which simulated the contact behavior of the shaft and bearing in an actual reciprocating …
Research On Vapor-Injected Rotary Compressor Through End-Plate Injection Structure With Check Valve, Yunchen Ding, Baolong Wang, Wenxing Shi
Research On Vapor-Injected Rotary Compressor Through End-Plate Injection Structure With Check Valve, Yunchen Ding, Baolong Wang, Wenxing Shi
International Compressor Engineering Conference
The refrigerant injection technology can improve the performance of heat pump in low ambient temperature. Traditional end-plate injection of rotary compressor controls the injection by the rotation of the piston, which leads to some drawbacks such as small injection area and bad adaptability to variable working condition. By adopting a check valve system, a novel end-plate gas injection structure for rotary compressor had been put forward to increase injection port area and enhance the adaptability to variable working condition in previous research. In this paper, a vapor-injected rotary compressor prototype is manufactured and tested compared to single stage and two …
A Low Vibration Type Compressor For Refrigerators Using A Self-Standing Support Method, Ko Inagaki, Yasuhiro Bonkobara, Takahiro Kondou, Mie Ike, Takayuki Hamahata
A Low Vibration Type Compressor For Refrigerators Using A Self-Standing Support Method, Ko Inagaki, Yasuhiro Bonkobara, Takahiro Kondou, Mie Ike, Takayuki Hamahata
International Compressor Engineering Conference
In household refrigerators, the rotational speed of a reciprocating compressor can be appropriately adjusted according to the temperature inside of the refrigerator. The lower rotational speed reduces the power consumption of the compressor. However, several natural frequencies of the compressor exist in the low rotation region, and besides, the unbalance force arising from the piston motion acts on the internal drive unit. Thereby the vibrations of the compressor are likely to be larger due to the resonance in the low rotation region. Although the compressor on the refrigerator is supported by vibration-proofing materials, such as rubber bushes, it is difficult …
Development Of Large Capacity And High Efficiency Rotary Compressor, Jafet Ferdhy Monasry, Takuya Hirayama, Toshimasa Aoki, Shougo Shida, Masahiro Hatayama, Masahiro Okada
Development Of Large Capacity And High Efficiency Rotary Compressor, Jafet Ferdhy Monasry, Takuya Hirayama, Toshimasa Aoki, Shougo Shida, Masahiro Hatayama, Masahiro Okada
International Compressor Engineering Conference
The authors had studied some elemental technologies to realize the large capacity and high efficiency in rotary compressor in order to achieve energy and material resource savings as well as in weight reduction of heat pump systems. Those elemental technologies are the cylinder dimension optimization, the new discharge structure, the divided vane structure, and the compatibility between sliding loss reduction and securing reliability in journal bearings. The new discharge structure is a structure in which two discharge ports are installed per cylinder. The discharge ports are designed with different in cross-sectional area and the responsiveness of each discharge valve is …
Tribological Properties Of Sliding Elements In Refrigerant Compressors Lubricated By Low-Gwp Refrigerant/Oil Mixtures, Shinichiro Ido, Tatsuya Sasaki, Kota Mizuno, Shuhei Koyama
Tribological Properties Of Sliding Elements In Refrigerant Compressors Lubricated By Low-Gwp Refrigerant/Oil Mixtures, Shinichiro Ido, Tatsuya Sasaki, Kota Mizuno, Shuhei Koyama
International Compressor Engineering Conference
In response to global regulation of high global warming potential (GWP) refrigerants, the application of lower GWP refrigerants to air conditioning equipment has been strongly accelerated. Toward the adoption of new refrigerant alternatives, evaluations of tribological properties of sliding elements in compressors are essential because the physical properties of refrigerant oil mixed with the refrigerant strongly affect the seizure resistance of the compressors. Here, we selected several refrigerants including hydrofluoroolefin (HFO) as candidates for a low-GWP refrigerant applicable to refrigerant compressors. We measured the viscosity of lubricating oil mixed with the liquid refrigerant. We also performed seizure resistance tests in …
Fluid Flow Through Front Clearances Of Dry Running Screw Machines Using Dimensionless Numbers, Matthias Utri, Andreas Bruemmer
Fluid Flow Through Front Clearances Of Dry Running Screw Machines Using Dimensionless Numbers, Matthias Utri, Andreas Bruemmer
International Compressor Engineering Conference
Chamber model simulation is a common approach for the simulation of positive displacement machines. For this kind of simulation the clearance mass flow is usually predicted using an isentropic approach, which is corrected with a flow coefficient in order to picture the real flow conditions and the corresponding mass flow. The detailed knowledge of the flow coefficient and its dependencies is crucial for a meaningful simulation of positive displacement machines. This paper investigates the two-dimensional fluid flow through the front clearance of twin screw compressors using the finite volume method. Dimensionless numbers are determined using the PI-theorem and are varied …
Research On Charging Process Strategy Of Airborne Compressor, Ling Yang, Yun Li, Pengfei Li, Jianming Xu
Research On Charging Process Strategy Of Airborne Compressor, Ling Yang, Yun Li, Pengfei Li, Jianming Xu
International Compressor Engineering Conference
An air tank can be inflated with compressed air at anytime if the aircraft is equipped with an airbone compressor. . The different inlet altitude conditions and residual tank pressures both make it difficult to plan strategy about air tank filling. This paper studied the charging performance of the filling process in these complex working conditions, and proposed an inflating strategy of airborne compressor. A dynamic model is constructed to simulate the filling process of a multi-stage compressor with finite interstage volume. It takes 6 minutes to fill a tank with 2.0L volume from 0.101 MPa to 35 MPa, and …
Experimental Study On P-V Diagram And Motion Curve Of Suction And Discharge Valve In Reciprocating Compressor, Gang Huang, Xuebao Shen, Zhiqi Yan
Experimental Study On P-V Diagram And Motion Curve Of Suction And Discharge Valve In Reciprocating Compressor, Gang Huang, Xuebao Shen, Zhiqi Yan
International Compressor Engineering Conference
In this paper, through the establishment of the experiment test platform, the synchronous test of crankshaft rotation angle, cylinder pressure and valve motion of reciprocating refrigeration compressor is realized. And the factors affecting the performance of reciprocating refrigeration compressor and the performance of compressor are studied. The rotary encoder is used for monitoring transient pressure variation of suction and discharge valve port and internal cylinder during compressor running. And it can measure precisely the displacement of valve movement by optical fiber sensor. Through the study analysis on P-V diagrams under different conditions, compressor suction and discharge process of work and …
Analysis Of Water Evaporation In Twin Screw Compressors Using Eulerian Multiphase Approach In Cfd, Sham Ramchandra Rane, Ahmed Kovacevic, Nikola Stosic, Graham Stupple
Analysis Of Water Evaporation In Twin Screw Compressors Using Eulerian Multiphase Approach In Cfd, Sham Ramchandra Rane, Ahmed Kovacevic, Nikola Stosic, Graham Stupple
International Compressor Engineering Conference
3D CFD modelling is widely employed for the detailed analysis of flow and thermodynamics in complex machines such as twin screw compressors. The advantage of such high resolution simulations is that realistic geometry of the rotors and the ports can be captured. Additionally, the physical effects of fluid thermal interactions and leakage are directly captured by these models. Recent studies have shown that for dry air and oil injected air compressors a good agreement is achieved with measurements, in prediction of performance parameters. In these simulations the Eulerian-Eulerian multiphase modelling has been applied. To implement the same model for water …
A Novel Structure Of Rolling Piston Type Rotary Compressor, Myeong Su Shin, Sang-Kyung Na, G.M. Choi
A Novel Structure Of Rolling Piston Type Rotary Compressor, Myeong Su Shin, Sang-Kyung Na, G.M. Choi
International Compressor Engineering Conference
This paper presents a new design of rolling piston type rotary compressor and the analysis of the performance of the novel compressor is conducted. The concept of the novel compressor is to utilize the interior space of the roller as inner working volume. The vane is connected and fixed to the outer cylinder and the inner cylinder, and the split bush is located between the roller and the vane to help revolution of the roller. Therefore, the novel compressor has two working volumes. One is outer volume trapped within the outer cylinder, the vane, and the roller and the other …
Flow Visualization And Cfd Simulation Of Impinging Oil Separator For Compressors, Jiu Xu, Predrag S. Hrnjak
Flow Visualization And Cfd Simulation Of Impinging Oil Separator For Compressors, Jiu Xu, Predrag S. Hrnjak
International Compressor Engineering Conference
Oil is needed for most of compressors in HVAC industry but oil circulating in the system is unfavorable for the heat exchanger performance and cycle efficiency. A common solution for oil issue is separating oil at the compressor discharge and returning it back to the compressor. For compactness, oil separation structure integrated into the compressor is more and more popular than traditional external oil separator. Therefore, analytical tools and design guideline of oil separation structure is important, especially for irregular geometry and realistic flow condition at the compressor discharge. As one of major mechanisms of droplet separation, impinging mechanism is …
Experimental Investigation On A Novel Two-Stage Sliding-Vane Air Compressor Based On The Intracooling Concept, Ida Costanzo, Gianluca Valenti, Stefano Murgia, Francesca Baia
Experimental Investigation On A Novel Two-Stage Sliding-Vane Air Compressor Based On The Intracooling Concept, Ida Costanzo, Gianluca Valenti, Stefano Murgia, Francesca Baia
International Compressor Engineering Conference
Intercooling is a well-known practice in compression technology for reducing the discharge temperature and the power consumption of the process. Intracooling, a similar yet not identical concept, is the cooling of the compressed gas between two compression stages by way of spraying a liquid coolant in the gas flow without separating that liquid prior to the second compression stage. This liquid coolant can be the cooled lube oil. The present work reports the experimental experience on a first prototype of a small-scale two-stage sliding-vane compressor based on the concept. The prototype is design for a relatively low delivery pressure, 0.7-1.0 …
Effect Of Fluid Flow Inertia And Backflow On The Effective Force And Flow Areas Of Reed-Type Valves, Sergio Koerich Lohn, Ernane Silva, Diego Beppler, Cesar J. Deschamps
Effect Of Fluid Flow Inertia And Backflow On The Effective Force And Flow Areas Of Reed-Type Valves, Sergio Koerich Lohn, Ernane Silva, Diego Beppler, Cesar J. Deschamps
International Compressor Engineering Conference
Reed-type valves are used to control the suction and discharge processes in small reciprocating compressors. Simulation models adopted in the preliminary design of such compressors usually employ the concepts of effective force and flow areas to characterize valve performance. These parameters are evaluated considering steady flow through the valve port, and hence neglecting flow inertia in the opening and closing stages of the valve motion. Moreover, both effective areas are also considered not to be affected by the presence of backflow. This paper presents a numerical study about the effect of flow inertia and backflow on the effective flow and …
A Study On A Numerical Modelling Of Discharge Line Flow Analysis Of A Household Type Refrigerator, Ismail Yesilaydin, L. Berrin Erbay
A Study On A Numerical Modelling Of Discharge Line Flow Analysis Of A Household Type Refrigerator, Ismail Yesilaydin, L. Berrin Erbay
International Compressor Engineering Conference
The main component that determines the performance and efficiency of the refrigeration system is the compressor, which is the major energy consumer in a vapor-compression refrigeration system. In hermetic compressors for household refrigerators, one of the major factors that influences the total compressor efficiency is the flow efficiency of discharge line. In order to find out the effect of the structural changes to flow losses and pressure fluctuations at discharge line, this paper presents a three-dimensional CFD model and experimental study of a hermetic reciprocating compressor. In the first phase of this study, transient numerical flow analysis was developed and …
Experimental And Numerical Investigation Of A Roots Expander Integrated Into An Orc Power System, Antoine Parthoens, Olivier Dumont, Ludovic Guillaume, Lemort Vincent
Experimental And Numerical Investigation Of A Roots Expander Integrated Into An Orc Power System, Antoine Parthoens, Olivier Dumont, Ludovic Guillaume, Lemort Vincent
International Compressor Engineering Conference
The performance of internal combustion engines can be improved by valorising the waste heat by means of organic Rankine Cycle power systems (ORC). This paper focuses on an expander of a truck-embedded ORC system. The considered expander is a roots machine. The roots machine is a volumetric machine characterized by a theoretical internal volume ratio of 1. It is typically used as compressor under low pressure ratios (for instance, engine supercharging or air “blowers”). First, a test rig has been built to perform several tests on the volumetric machine. It is an ORC power system with a typical architecture using …
Study Of Novel Rotary Cylinder Compressor, Yusheng Hu, Jia Xu, Zhongcheng Du, Zhongcheng Du
Study Of Novel Rotary Cylinder Compressor, Yusheng Hu, Jia Xu, Zhongcheng Du, Zhongcheng Du
International Compressor Engineering Conference
A positive displacement rotary compressor is introduced:RCC(Rotary Cylinder Compressor). For implementing suction and exhaust process, the compressor's cylinder and shaft revolve around their own axes while the piston reciprocates relative to the cylinder and shaft. Compared with rotary piston compressor, the RCC has the advantages of high volumetric efficiency and small torque ripple.
Research On Low Frequency Vibration Of Rotary Compressor, Zhiming Wen, Yaosi Zhang, Yusheng Hu, Rongting Zhang, Huanhuan Gu, Jinquan Zhang
Research On Low Frequency Vibration Of Rotary Compressor, Zhiming Wen, Yaosi Zhang, Yusheng Hu, Rongting Zhang, Huanhuan Gu, Jinquan Zhang
International Compressor Engineering Conference
Low frequency noise is very boring and penetrating. To a certain domestic air-conditioner, the abnormal low frequency booming noise of the outdoor unit when the compressor operating at certain low RPM's is detected. Experiment and simulation analysis are taken, and it is determined that the 1st order flexible modal resonance of the accumulator is excited at certain operating RPM's which causing structure-borne noise passes through suction pipes. To solve this problem, two projects are produced to optimizing the linking property between accumulator and compressor shell: 1) increasing linking damping to reduce resonance area response; 2) increasing linking stiffness in order …
Research On Two-Stage Rotary Compressor With Refrigerant Injection For Cold Climate Heat Pump, Yusheng Hu, Huifang Luo, Jian Wu, Huijun Wei, Ouxiang Yang
Research On Two-Stage Rotary Compressor With Refrigerant Injection For Cold Climate Heat Pump, Yusheng Hu, Huifang Luo, Jian Wu, Huijun Wei, Ouxiang Yang
International Compressor Engineering Conference
As an promising heating application of environmental conservation and energy conservation, air-source heat pump systems has been spreading. However, conventional heat pump systems have problems remaining, such as inadequate heating capacity and reduced performance under low environmental temperature condition. To solve these problems, we developed a two-stage rotary compressor for household R32 air-source heat pump system. We analyzed the thermodynamic characteristics of two-stage rotary compressor with refrigerant injection used in heat pump system with economizer. It is found that the two-stage rotary compressor can enhance heating capacity and performance of R32 heat pump under cold climate markedly.
Numerical Simulation Of Discharge Process In The Single Screw Compressor, Zhao Zhang, Chengyu Peng, Weifeng Wu
Numerical Simulation Of Discharge Process In The Single Screw Compressor, Zhao Zhang, Chengyu Peng, Weifeng Wu
International Compressor Engineering Conference
In the process of the single screw air compressor, the symmetrical grooves of the compressor are periodically connected with the discharge ports and the gas enters the discharge chamber or flows back from chamber, generating gas pulsation. The gas pulsation increases the flowing loss to bring additional energy loss, meanwhile the gas pulsation is the one of main reasons for the generation of vibration and noise. The thermodynamic model of the compression chamber and the discharge chamber of a single screw air compressor is established in this paper taking the discharge chamber structure and the flow resistance into consideration. The …
Investigation Of Valve Reed-Impact Plate Interaction With Respect To Their Impact Fatigue Properties, Muhammad Waqas Tofique, Chris Millward, Alexander Lof, Azhar Nawaz
Investigation Of Valve Reed-Impact Plate Interaction With Respect To Their Impact Fatigue Properties, Muhammad Waqas Tofique, Chris Millward, Alexander Lof, Azhar Nawaz
International Compressor Engineering Conference
During the operation of the reciprocating compressors, the flapper valve closes by striking against the valve impact plate. This valve reed and impact plate interaction is repeated billions of times and is thought to play a significant role in controlling the impact fatigue life of the valve reed and, hence, the performance of the compressor. The effect on impact fatigue properties of the interaction between the valve reed and the impact plate has been recognized as one of the potentially important aspects of compressor design. The goal of this study was to understand how the performance and impact fatigue life …