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Journal articles on the topic 'Compression air'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

Sun, Jianting, Hucan Hou, Zhitao Zuo, Hongtao Tang, and Haisheng Chen. "Numerical study on wet compression in a supercritical air centrifugal compressor." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 3 (2019): 384–97. http://dx.doi.org/10.1177/0957650919861490.

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Wet compression is widely used to reduce compression work and improve efficiency in gas turbines. However, wet compression has not been industrially applied in the compressed air energy storage system (only few studies on isothermal compressed air energy storage system exist), which has an urgent demand to reduce the compression work. The high-pressure section of the compressed air energy storage system usually contains supercritical air, and the influence of supercritical wet compression is not yet clear. Thus, in this study, supercritical wet compression was numerically investigated in a cen

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2

Balashanmugam, P., and G. Balasubramanian. "DESIGN AND FABRICATION OF MULTI ENGINE AIR COMPRESSOR." EPH - International Journal of Science And Engineering 5, no. 4 (2019): 18–27. http://dx.doi.org/10.53555/eijse.v5i4.28.

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A compressor is used to get high pressure air for many industrial and commercial purpose. The triangular air compressor with the common compression chamber is a reciprocating type compressor, which delivers air at high pressure with less vibration and less power consumption than the existing ones. Triangular air compressor with common compression chamber uses three cylinders and the entire cylinder and all the cylinders will have their own connecting red, crank shaft, pistons and chain sprockets and it is driven by a chain drive. During operation the pistons will move in phase from BDC to TDC

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3

Pan, Xi, Man Wang, Zi-wen Xing, and Shu-lin Pan. "Structural study on a swing compressor with no valves for air compression." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 23 (2017): 4390–98. http://dx.doi.org/10.1177/0954406217750188.

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This paper presents a novel swing compressor with no valves employed in air compression. The design and work principle of this swing compressor are introduced. And the effects of discharge port, exhaust cavity, and crank speed on the performances of this compressor are analyzed. Under the same operating conditions and dimensions, the size of exhaust cavity mainly depends on the discharge port width. Additionally, the exhaust cavity angle has a direct impact on the compression process, whether it is over-compression or under-compression. And the over-compression loss can be designed below 2%. O

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4

Shaw, Dein, Jyun Yu Cai, and Chien Ting Liu. "Transmission Design for a Wind Powered Compressed Air Generation System." Applied Mechanics and Materials 86 (August 2011): 293–96. http://dx.doi.org/10.4028/www.scientific.net/amm.86.293.

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In this study, a new idea of wind powered air compression system is introduced. Present study relates to an air compression system having a characteristic of storing wind energy. A transmission system transfer the wind power to an air compression system is also studied. The air compressed system is comprised of a windmill, an energy storage device, an air compressor, and an air storage device for collecting the wind energy and storing the energy in a form of compressed air. In order to find the basic characters of the system, several experiments were done and a transmission system was selected

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Ren, Xu, Cai, Wang, and Li. "Experiments on Air Compression with an Isothermal Piston for Energy Storage." Energies 12, no. 19 (2019): 3730. http://dx.doi.org/10.3390/en12193730.

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Air is usually compressed adiabatically in the compressor. As the operating speed of compressors can be several thousand rpm, heat generated during compression cannot be sufficiently transmitted to the environment in such a short time. It is for this reason that compressor efficiency is limited. Isothermal compression could be an alternative choice applied on industrial compressor and compressed air energy storage (CAES). This paper proposed a new kind of piston to perform isothermal compression. Surface area of such isothermal piston structure is larger. A certain amount of fluid at the chamb

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6

Karaali, Rabi, and Arzu Keven. "Evaluation of four different cogeneration cycles by using some criteria." Applied Rheology 32, no. 1 (2022): 122–37. http://dx.doi.org/10.1515/arh-2022-0128.

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Abstract The purpose of this article is to evaluate four different gas turbine cogeneration cycles which are basic, absorption cooling, air heating and air fuel heating cogeneration cycles by using the most important six evaluation criteria for different excess air coefficient, different compression rates, and different compressor inlet air temperatures. These six evaluation criteria are electrical heat ratio, exergy efficiency, incremental heat rate, artificial thermal efficiency, fuel energy saving ratio, and specific fuel consumption. It is seen that the air-fuel heating cogeneration cycle

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7

Yang, Yon Gan, Zhao Yang, and Qiu Bo Xu. "Analysis on the Application of the VRF Air-Conditioning Compressor in the Field of Freezing and Cold Storage." Applied Mechanics and Materials 325-326 (June 2013): 1374–77. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.1374.

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This paper introduces the program that the compound compression is achieved through adopting the grouping ways of the VRF air-conditioning compressor, and draws the conclusion that when using the refrigerant R410a, the compound compression is feasible for the evaporating temperature higher than-36°C. The application of the variable-frequency compressor of the air-conditioner and the method of thermodynamic calculation of the single-stage throttle and incomplete inter-cooling are discussed. For guaranteeing the optimal intermediate pressure and adjusting the volume ratio, to utilize the VRF air

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8

Ahn, Barah, Macey Schmetzer, and Paul I. Ro. "Comparative Study of Solid-Based and Liquid-Based Heat Transfer Enhancement Techniques in Liquid Piston Gas Compression." Energies 18, no. 8 (2025): 2032. https://doi.org/10.3390/en18082032.

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The combination of a liquid piston gas compressor and a solid metal insert can achieve a near-isothermal compression process, which can greatly contribute to improving the system efficiency of a compressed-air energy storage system. To examine the effectiveness of the insert at various pressure levels, compressions were performed in a liquid piston compressor with and without copper wire mesh inserts at three different pressures of 1, 2, and 3 bars. The use of inserts increased isothermal compression efficiencies by 8–10% from the baseline isothermal efficiencies about 83–87%, while the compro

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9

Borzea, Claudia, Iulian Vlăducă, Dan Ionescu, et al. "Compressed Air Energy Storage Installation for Renewable Energy Generation." E3S Web of Conferences 112 (2019): 02010. http://dx.doi.org/10.1051/e3sconf/201911202010.

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Compressed Air Energy Storage (CAES) installations are used for storing electrical power, under the form of potential energy from compressed air. The heat generated during compression can be stored to improve the efficiency of compression-expansion cycle. The solution presented consists of a 100 kW screw compressor driven by a 110 kW asynchronous three-phase motor. The compressor supplies air into vessels which store it until a high electrical energy demand arises. At that time, the compressed air is released into a 132 kW screw expander whose shaft spins a 132 kW asynchronous generator, produ

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10

Yusha, V. L., and S. S. Busarov. "Method for calculating actual capacity of single-stage long-stroke reciprocating compressors." Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering 4, no. 4 (2020): 9–15. http://dx.doi.org/10.25206/2588-0373-2020-4-4-9-15.

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The article presents a generalized method for calculating the actual performance of low-speed longstroke air compressor stages of compression, based on determining the flow rate as a set of coefficients reflecting the influence of various factors on productivity losses. The method takes into account the design and operating features of low-speed long-stroke air compressor stages of compression and differs significantly from a similar method used to calculate high-speed stages of reciprocating compressors

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11

Bultman, D. H., L. C. Burmeister, and V. Bortone. "Effects of Condenser Air Flow Blockage on Vapor-Compression Refrigerator Performance." Journal of Energy Resources Technology 117, no. 4 (1995): 349–53. http://dx.doi.org/10.1115/1.2835434.

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The performance of a nominally 10.5-kW (3-ton) vapor-compression refrigeration system was numerically simulated for air flow rates across the condenser heat exchanger between 60 and 150 percent of the standard value. The results can be used for estimating the energy and cost savings achievable by restoring standard air flow rates across partially blocked condensers of vapor-compression refrigeration systems. The system coefficient of performance was predicted to decrease by 7.6 percent from its value of 2.912 at standard air flow when air flow across the condenser decreased by 40 percent. The

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12

Levihin, A.A., and I.A. Volobuev. "Microturbine Wave Compressor Optimal Regimes." Problemele Energeticii Regionale 2(43) (August 13, 2019): 1–9. https://doi.org/10.5281/zenodo.3367056.

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The work is devoted to the problem of improving the efficiency of air compression in the compressor of the microturbine installation. The wave compressor in which compression occurs as in a supersonic air intake is investigated. The purpose of the study isto find the region of existence of optimal shock-wave structures at which the stagnation pressure loss in a wave compressor will be minimal. Two cases were studied: compression in a system of two shock waves of the same direction; compression in a centered isentropic wave. The research method combines a numerical experiment with an analytical

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13

Syahrisal, Syahrisal. "Analisis Kinerja Sistem Kompresor Udara Botol Angin Sebagai Sumber Pembangkit Generator Di Laboratorium Engine Hall Politeknik Ilmu Pelayaran Makassar." Jurnal Teknik Mesin Sinergi 19, no. 1 (2021): 25. http://dx.doi.org/10.31963/sinergi.v19i1.2734.

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The compressed air supply device on the ship is auxiliary equipment used for starting the engine. The purpose of this study is to analyze the performance of the air compressor as a generator source in the Engine Hall laboratory. This study seeks to determine the performance of the compressor sistem as a generator drive in the Engine Hall Laboratory and the efficiency of the compressor sistem. The methodology used in this research is a quantitative method by calculating the performance of the compressor sistem as a generator, including compressors and wind bottles. The conclusion of this study

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14

Saravana, A., H. Liu, N. Able, J. Collins, E. A. Groll, and D. Ziviani. "Conjugate heat transfer analysis of a twin-screw compressor with 4-6 configuration and internal cooling channels." IOP Conference Series: Materials Science and Engineering 1267, no. 1 (2022): 012014. http://dx.doi.org/10.1088/1757-899x/1267/1/012014.

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Twin-screw compressor technology is widely employed in commercial and industrial HVAC&R applications as well as in air-compression and gas processing industries. Twin-screw compressors are characterized by relatively high efficiencies at part- and full-loads, and high reliability. However, innovative designs and higher efficiency are needed to further reduce power consumption, improve the compression process, and minimize internal losses. This study focuses on developing a simulation model of a twin-screw compressor with internal cooling channels to achieve a near isothermal compression pr

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15

Park, Joong-kyoo, Paul I. Ro, Xiao He, and Andre P. Mazzoleni. "Analysis, Fabrication, and Testing of a Liquid Piston Compressor Prototype for an Ocean Compressed Air Energy Storage (OCAES) System." Marine Technology Society Journal 48, no. 6 (2014): 86–97. http://dx.doi.org/10.4031/mtsj.48.6.3.

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AbstractPrevious work concerning ocean compressed air energy storage (OCAES) systems has revealed the need for an efficient means for compressing air that minimizes the energy lost to heat during the compression process. In this paper, we present analysis, simulation, and testing of a tabletop proof-of-concept experiment of a liquid piston compression system coupled with a simulated OCAES system, with special attention given to heat transfer issues. An experimental model of a liquid piston system was built and tested with two different materials, polycarbonate and aluminum alloy, used for the

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16

Didenko, V. N., D. A. Khvorenkov, and I. I. Fakhraziev. "Graphic Analytical Methods for Determining Moist Air Characteristics in Multistage Compressors." Vestnik IzhGTU imeni M.T. Kalashnikova 25, no. 4 (2022): 86–96. http://dx.doi.org/10.22213/2413-1172-2022-4-86-96.

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The purpose of the study is a comparative analysis of methods for graphic analytical determination of the characteristics of moist air in multistage compressors. Two methods are compared, which differ in the used I-d-diagrams: unified in terms of pressure and atmospheric. I-d-diagrams unified in terms of pressure differ from atmospheric ones by diagrams of saturated air relative humidity () only at various pressures. For multistage compressors, curves are plotted on unified I-d-diagrams at atmospheric pressure and compressed air pressure in intercoolers and receivers. It is assumed that the is

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17

Sazonov, I. A., M. A. Mokhov, Kh A. Tumanyan, M. A. Frankov, and S. I. Markelov. "Development of an Automated Compressor Unit for Gas Compression at the Periodic Connection of an Ejector." Journal of Computational and Theoretical Nanoscience 16, no. 12 (2019): 5378–83. http://dx.doi.org/10.1166/jctn.2019.8586.

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The authors developed a new scientific approach for gas compression using ejector compressor units. A new patented technical solution opens up the prospect for the effective use of ejector compressor units when compressing various gases to pressures of 10…40 MPa. The goal of the research work is the development of automation systems using new scientific principles for gas compression. A new scientific approach is associated with the improvement of the ejector compressor unit, with the provision of conditions for the periodic connection of the ejector as part of the implementation of the cyclic

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18

Kim, Kyoung Hoon, and Chul Ho Han. "Performance Analysis of Wet Compression Process under Critical Conditions of Water Injection." Applied Mechanics and Materials 229-231 (November 2012): 2541–45. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.2541.

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In wet compression process water is injected at an inlet of compressor and continuous cooling occurs due to evaporation of water droplets during the compression process of air, which can save the compression work and enhance the performance of gas turbine system. In this work, performance analysis of the wet compression process is carried out under the critical conditions of water injection which are defined as the maximum water injection which can be evaporated completely inside the compressor. For various ambient conditions the important variables of wet compression process such as water inj

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19

Oropallo, Alisha, Giovanni Mosti, Nicos Labropoulos, Antonios Gasparis, and Ismene Germanakos. "Can Air-Inflated Compression Provide Higher Inelastic Compression?" Journal of Vascular Surgery: Venous and Lymphatic Disorders 12, no. 3 (2024): 101751. http://dx.doi.org/10.1016/j.jvsv.2024.101751.

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20

Sun, Jianting, Xin Zhou, Qi Liang, Zhitao Zuo, and Haisheng Chen. "The Effect of Wet Compression on a Centrifugal Compressor for a Compressed Air Energy Storage System." Energies 12, no. 5 (2019): 906. http://dx.doi.org/10.3390/en12050906.

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There is an urgent demand to reduce compression power consumption in Compressed Air Energy Storage (CAES) systems. Wet compression has been widely used in gas turbines to reduce compressor power consumption and improve thermal efficiency, but this technology has not been applied yet in the CAES field. In this paper, a centrifugal compressor for CAES was numerically studied to investigate the effect of wet compression on compressor and droplet motion. The results showed that wet compression makes the performance curve shift to a high-pressure ratio/efficiency. Meanwhile, wet compression lowers

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21

Yao, Jia Wei, Yu Pu Song, and Ling Xia Gao. "Experimental and Theoretical Study of Air-Entraining Concrete under Biaxial Compression after Freezing-Thawing Cycle." Advanced Materials Research 243-249 (May 2011): 214–17. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.214.

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Mechanical properties experiments of air-entraining concrete after suffered to 0, 100, 200, 300 and 400 freezing-thawing cycles were performed. The experiment method, contents and result of strength and deformation of air-entraining after freezing-thawing cycle under biaxial compression were also introduced. The relationship between the strain corresponding to peak stress and cycle of freezing-thawing as well as the relationship between compressive strength and cycle of freezing-thawing were analyzed. The failure criterion of air-entraining concrete under biaxial compression was established.

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22

A P, Yashwant, Tanushree Kale, Nikita Mane, Purva Rupavate, and Gaurav Bankar. "Working Model of Turbojet Engine." International Scientific Journal of Engineering and Management 03, no. 12 (2024): 1–7. https://doi.org/10.55041/isjem02148.

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The project made to show the working model of Turbojet Engine. The turbojet engine operates on the Brayton cycle and features four primary stages: air intake, compression, combustion, and exhaust. The turbo-jet engine is for high speeds. The working model shows how atmospheric air is taken in and compressed using a multi-stage axial or centrifugal compressor. The compressed air then enters the combustion chamber, where it mixes with fuel and undergoes ignition, producing high-energy exhaust gases. These gases rapidly expand through a turbine, extracting mechanical energy to drive the compresso

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23

Rong, Weilai, Guoyuan Ma, Cong Han, Shuxue Xu, Shangyu Sun, and YU Guoxin. "Performance analysis of an air compression refrigeration system for data center cooling." Thermal Science, no. 00 (2024): 94. http://dx.doi.org/10.2298/tsci231208094r.

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An air compression refrigeration performance calculation model applied to data center cooling was established, which is a reverse Brayton cycle system, the operation performance was studied by numerical simulation and the influence of supply air temperature, ambient temperature, pressure ratio, data center room temperature was analysed. The results showed that when the pressure ratio of the air compressor is 1.3, the system obtains the maximum cooling COP; heat exchanger efficiency have a significant effect on the cooling capacity and cooling COP, the efficiency of the heat exchanger increases

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24

Percembli (Chelmuș), Adalia Andreea, Arthur Dupuy, Lavinia Grosu, Daniel Dima, and Alexandru Dobrovicescu. "Exergetic Analysis and Design of a Mechanical Compression Stage—Application for a Cryogenic Air Separation Plant." Entropy 27, no. 5 (2025): 532. https://doi.org/10.3390/e27050532.

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This study focuses on the compression area of a cryogenic air separation unit (ASU). The mechanism of exergy consumption in the compressor was revealed. The influence of the compression ratio and of the isentropic efficiency per stage give arguments for proper choice of these decisional parameters. For the purchase cost of the compressor, an exergoeconomic correlation based on the exergetic product represented by the compression ratio and the isentropic efficiency as the Second Law coefficient of performance was used instead of the common thermo-economic one based only on the cost of materials

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25

Gurnule, Shashank, and Ritesh Banpurkar. "Design, Modification and Analysis of Industrial Air Compressor (Type: Vt4): A Review." International Journal of Advance Research and Innovation 6, no. 4 (2018): 142–46. http://dx.doi.org/10.51976/ijari.641817.

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This paper presents a review on how important the intercooling of air compressor is necessary for an efficient process. Basically the meaning of air compression is to reduce a specified volume, resulting in an increase in pressure. For improving efficiency of the system compression is done in more than one stage and between each stage intercooler is provided. Intercooler improves the quality of air and reduces inlet air temperature. The function of the intercooler is to cool the air as it leaves the Low Pressure cylinder and before it enters the High Pressure cylinder. This improves the effici

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26

LI, QUBO, DEMISS A. AMIBE, and NORBERT MÜLLER. "USING WATER VAPOR AS REFRIGERANT IN MULTISTAGE VARIABLE SPEED TURBO COMPRESSOR TO IMPROVE SEASONAL ENERGY EFFICIENCY RATIO OF AIR CONDITIONING." International Journal of Air-Conditioning and Refrigeration 19, no. 02 (2011): 131–40. http://dx.doi.org/10.1142/s2010132511000491.

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An air conditioning system using water as refrigerant (R718) that compresses water vapor with multistage stage variable speed axial compressor with intercooling between stages by water injection is considered. Four stage compression with flash intercooling resulted in 50% improvement of coefficient of performance (COP) at full load compared to conventional refrigerants like R134a. The energy efficiency of an air conditioning unit is specified by seasonal energy efficiency ratio (SEER). SEER is defined as the ratio of cooling output of an air conditioner measured and electrical energy consumpti

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27

Glinscaya, Anna, Vadim Tynchenko, Oksana Kukartseva, Elena Suprun, and Alena Nizameeva. "Comparative analysis of compressed air production equipment." E3S Web of Conferences 549 (2024): 05009. http://dx.doi.org/10.1051/e3sconf/202454905009.

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In this paper the main devices for the production of compressed air - compressors are considered. The text describes their classification according to the principle of operation and principles of operation, which shows one of the principle air circuits of the compressor system with an electric circuit control of the electric drive of the compressor on ships with the complex automation of the power plant. And also in our work provides a comparison of different models of bulk compressors to determine which compressors are needed for more comfortable and safe operation. Consequently, they noted t

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28

Liu, Hu, Yankang Zhang, Pengfei Yu, Jingwen Xue, Lei Zhang, and Defu Che. "Numerical Investigation on Thermal–Hydraulic Performance of a Printed Circuit Heat Exchanger for Liquid Air Energy Storage System." Energies 15, no. 17 (2022): 6347. http://dx.doi.org/10.3390/en15176347.

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A printed circuit heat exchanger (PCHE) is utilized to cool the compressor inlet air to increase the compression efficiency in a liquid air energy storage and liquid natural gas (LNG) coupled system, which can offer large-scale energy storage with significantly improved exergy efficiency and round-trip efficiency. In this work, the effect of pressure of air, incline angle, and hydraulic diameter on the performance of a compressed air–water PCHE with a semicircle cross-section was studied. The results show that PCHE can realize the intermediate cooling of air compression in the liquid air energ

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29

Zhuang, Chuan Yi, Ya Li Ye, and Yan Zhou. "Evaluation of Moisture Susceptibility for Asphalt Mixtures." Applied Mechanics and Materials 361-363 (August 2013): 1563–66. http://dx.doi.org/10.4028/www.scientific.net/amm.361-363.1563.

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Types of asphalt mixture with different gradations and air voids were designed. Tests on their indirect tensile strength, compressive strength and resilient modulus of compression under single axle compressing were taken to study the effects of two forms of water immersion (hot water immersion and freeze-thaw split test) on asphalt mixtures mechanical performance and high temperature stability. Test results point out that water immersion decreased asphalt mixtures performance seriously and the effect of freeze-thaw split tests on asphalt mixtures performance is far stronger than that of hot wa

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30

Frank, Daniel, Stefan Wazlawik, Samara Brandao de Almeida, Christiane Bauer, and Caroline Willich. "Model-Based Development of Control Strategies for a Fuel Cell Air Supply System and Experimental Verification at Flight-Relevant Conditions." ECS Meeting Abstracts MA2024-02, no. 26 (2024): 2059. https://doi.org/10.1149/ma2024-02262059mtgabs.

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The performance of hydrogen PEM fuel cell systems can be optimized by means of pressurization of the cathode air, especially in aviation, where at in-flight conditions the pressure of the ambient air is significantly lower as at on-ground conditions. To provide the inlet air at optimal conditions (p, T, rH) during flight, an air supply system is required and in an all-electric aircraft the compression should happen by means of an electric centrifugal compressor. A challenge for the operation of a pressurised fuel cell system at high altitudes is the control of the compression system. Any unsta

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Li, Yanan, Jingfu Wang, Yuting Wu, and Biao Lei. "Influence of water injection atomization on the performance of water-lubricated single screw air compressor." E3S Web of Conferences 257 (2021): 03069. http://dx.doi.org/10.1051/e3sconf/202125703069.

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As the whole society attaches great importance to the safety of food and medicine, and hydrogen fuel cell and new energy vehicle industry rises suddenly, people’s requirements for clean compressed air is more and more urgent. Water-lubricated single screw compressor is an ideal choice for providing clean air because of the advantages of balanced force, a long service life, and high efficiency, and the influencing factors of its performance have received more and more attention. This study established a mathematical model of the working process of a water-lubricated single-screw air compressor

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Maziar, Reza, Kasni Sumeru, M. Y. Senawi, and Farid Nasir Ani. "Performance of Ejector Refrigeration Cycle for Automotive Air Conditioning." Applied Mechanics and Materials 819 (January 2016): 202–6. http://dx.doi.org/10.4028/www.scientific.net/amm.819.202.

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In this study, two experiments were performed, one with the conventional compression refrigeration cycle (CRC) and the other with an ejector refrigeration cycle (ERC). The CRC system for automotive air conditioning was designed, fabricated and experiments were conducted. The system was then retrofitted with an ejector as the expansion device and experiments were repeated for the ERC system. Calculations of the entrainment ratio, compressor compression ratio and coefficient of performance (COP) were made for each cycle. The calculations showed that ERC has some advantages over the CRC. In this

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33

Khatamova, D. N., and E. U. Yuldashev. "TEMPERATURE OF THE COMPRESSOR SUCTION AIR AND ITS INFLUENCE ON THE EFFICIENT OPERATION OF THE COMPRESSOR UNIT." American Journal of Applied Science and Technology 3, no. 10 (2023): 9–14. http://dx.doi.org/10.37547/ajast/volume03issue10-03.

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The climatic conditions of Uzbekistan are characterized by relatively long summers with air temperature of 40-45 0C and higher, which is the reason of significant heating of air suctioned by compressor. Increase in temperature and corresponding decrease inair density contributes to 8-10% decrease in compressor unit productivity, leading to significant economic losses in the process of compressed air production. By means of artificial cooling of suction air at the inlet to the compressor unit it is possible to increase the energy efficiency of operation of the mine reciprocating compressor unit

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Zamfirescu, Calin. "MODELING AND OPTIMIZATION OF AN AMMONIA-WATER COMPRESSION-RESORPTION HEAT PUMPS WITH WET COMPRESSION." Transactions of the Canadian Society for Mechanical Engineering 33, no. 1 (2009): 75–88. http://dx.doi.org/10.1139/tcsme-2009-0008.

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Wet ammonia-water compression-resorption heat pumps constitute an attractive alternative to the commonly known heat pumps based on Osenbrück cycle because they eliminate the necessity of oil-liquid refrigerant separation. In this respect, a special designed oil-free compressor operating under wet (two-phase) conditions equips the heat pump. The compressor is lubricated by the liquid refrigerant which is carried-out while compressing the vapor. The thermodynamic cycle is located completely inside the two-phase region. In this paper are demonstrated two procedures to optimize the design for COP

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Cui, Feng-kun, Huai-shuai Shang, Tie-jun Zhao, Guo-xi Fan, and Guo-sheng Ren. "Mechanical and Failure Criteria of Air-Entrained Concrete under Triaxial Compression Load after Rapid Freeze-Thaw Cycles." Advances in Materials Science and Engineering 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/6786270.

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The experiment study on the air-entrained concrete of 100 mm cubes under triaxial compression with different intermediate stress ratioα2=σ2D : σ3Dwas carried out using a hydraulic-servo testing system. The influence of rapid freeze-thaw cycles and intermediate stress ratio on the triaxial compressive strengthσ3Dwas analyzed according to the experimental results, respectively. The experimental results of air-entrained concrete obtained from the study in this paper and the triaxial compression experimental results of plain concrete got through the same triaxial-testing-system were compared and a

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Hakala, Tomi, Arja Puolakka, Pertti Nousiainen, Timo Vuorela, and Jukka Vanhala. "Application of air bladders for medical compression hosieries." Textile Research Journal 88, no. 19 (2017): 2169–81. http://dx.doi.org/10.1177/0040517517716907.

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The research work presents a new design of compression hosiery where compression around a human limb is generated using special air bladders. The pressure inside the air bladders is adjustable. The objective of the research was to study graduated compression and its control on the limb using the prototype with air bladders and two commercial compression products. The compression forces were measured around the limb under a knee in three sectors: a foot, a middle part and an upper part of the leg. Measurements were mainly done in vivo using the limb of a test person – although some pre-trials w

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Wen, Hu, Shixing Fan, Duo Zhang, Weifeng Wang, Jun Guo, and Qingfeng Sun. "Experimental Study and Application of a Novel Foamed Concrete to Yield Airtight Walls in Coal Mines." Advances in Materials Science and Engineering 2018 (June 25, 2018): 1–13. http://dx.doi.org/10.1155/2018/9620935.

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Airtight walls are vital to prevent spontaneous combustion of residual coal as caused by air leakage. A new type of foamed concrete (FC) was developed to control air leakage. FC specimens of four densities (250, 450, 650, and 850 kg/m3) were prepared for use in a series of physical and mechanical tests. A thickener was used to control the FC shrinkage and collapse. The permeability of the FC decreased approximately exponentially with an increasing density. On the contrary, the compressive strength (σ) and elastic modulus (E) increased in exponential and linear relationship separately with the

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Pattamaprom, Cattaleeya, Duangkamol Dechojarassri, and Worsak Kanok-Nukulchai. "The Effect of Cure Conditions on the Strength of Ebonite Rubber Network." Rubber Chemistry and Technology 78, no. 4 (2005): 724–35. http://dx.doi.org/10.5254/1.3547909.

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Abstract Although ebonite has been discovered for a long time, its applications were still limited to some household products. Recently, ebonite rubber has become of interest, especially for structural applications due to its high and adjustable strength and rigidity. The rigidity can be enhanced by several folds by utilizing appropriate curing conditions. In this study, we investigate the effect of curing conditions on the mechanical properties of ebonite at various cure time. Here, the crosslink densities were determined qualitatively both before and after compression cycles to investigate t

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HADI, SURYA. "PENGARUH AIR SODA TERHADAP KUAT TEKAN BETON." GANEC SWARA 15, no. 2 (2021): 1181. http://dx.doi.org/10.35327/gara.v15i2.234.

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Many research regarding concrete were conducted especially in order to enhance the strength, whether using additional materials or other substitutional materials. Of many research in order to enhance concrete compression strength, there were still any weaknesses found. This study aimed to investigate the effect of soda water used to partly substitute the water mixture towards concrete compression strength. This study used 0,6,7,8,9 and 10 % of soda water with six experimental objects for each and the total of experimental objects used were 36 objects. The conclusion taken from the experiment o

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Ramanathan, Anand, and Prabhakaran Gunasekaran. "Simulation of absorption refrigeration system for automobile application." Thermal Science 12, no. 3 (2008): 5–13. http://dx.doi.org/10.2298/tsci0803005r.

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An automotive air-conditioning system based on absorption refrigeration cycle has been simulated. This waste heat driven vapor absorption refrigeration system is one alternate to the currently used vapour compression refrigeration system for automotive air-conditioning. Performance analysis of vapor absorption refrigeration system has been done by developing a steady-state simulation model to find the limitation of the proposed system. The water-lithium bromide pair is used as a working mixture for its favorable thermodynamic and transport properties compared to the conventional refrigerants u

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PACAS, LUKAS. "METHODOLOGY FOR THE UTILIZATION OF WASTE HEAT BY AIR-COOLED COMPRESSORS." MM Science Journal 2021, no. 4 (2021): 4918–23. http://dx.doi.org/10.17973/mmsj.2021_10_2021093.

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Compressed air is still a valid helper in many applications today, where it is necessary, for example, to move work equipment, pistons or it is used for cooling as a cooling medium. The producer of compressed air are air compressors, which need an external source for its production, usually an electric or internal combustion engine. Almost all the energy that is supplied to the compressor is always converted to heat during compression, regardless of the type of compressor. This carries the risk of overheating and therefore the cooling system must be optimally designed. Thus, during the compres

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PACAS, LUKAS. "METHODOLOGY FOR THE UTILIZATION OF WASTE HEAT BY AIR-COOLED COMPRESSORS." MM Science Journal 2021, no. 4 (2021): 4918–23. http://dx.doi.org/10.17973/mmsj.2021_10_2021093.

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Compressed air is still a valid helper in many applications today, where it is necessary, for example, to move work equipment, pistons or it is used for cooling as a cooling medium. The producer of compressed air are air compressors, which need an external source for its production, usually an electric or internal combustion engine. Almost all the energy that is supplied to the compressor is always converted to heat during compression, regardless of the type of compressor. This carries the risk of overheating and therefore the cooling system must be optimally designed. Thus, during the compres

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Lin, Wei Qin, De Wen Kong, and Mao Lin Cai. "Research on Energy Consumption of Screw Compressor under Load/Unload." Applied Mechanics and Materials 84-85 (August 2011): 733–38. http://dx.doi.org/10.4028/www.scientific.net/amm.84-85.733.

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This paper analyzes the operation power of screw air compressor and the formula of power of isentropic adiabatic compression is given.Then the influence of leakage with the volume flow is described and the volumetric efficiency is calculated. Based on power and volume flow, the energy consumption model of screw air compressor is established and simulated with MATLAB.Simulation results prove that the optimal value of upper limit exists and the gas consumption affects the value.

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Khasanov, Rail, Victor Gureev, and Azat Khairullin. "Numerical Studies of Gas-Dynamic Characteristics in a Compressor of a Turbocharger of the Transport Diesel." Applied Mechanics and Materials 698 (December 2014): 649–54. http://dx.doi.org/10.4028/www.scientific.net/amm.698.649.

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An increase of a combustion chamber volume of internal combustion engines (ICE) is connected with the solution of a problem of burning in cylinders of bigger amount of fuel. Thus, providing the complete burning, a full scavenging of cylinders and maintenance in permissible limits of temperature of exhaust gases requires increasing air supply. The most effective method of increase in amount of air is an increase of its density by means of preliminary compression in the compressor with the subsequent cooling. It should be noted that high complexity and a large labor content of the natural experi

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Tretyakova, P. A., T. V. Germanova, and T. V. Tretyakova. "Improving energy efficiency at compressor stations using waste heat boilers at gas turbine plants." IOP Conference Series: Earth and Environmental Science 990, no. 1 (2022): 012052. http://dx.doi.org/10.1088/1755-1315/990/1/012052.

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Abstract Improving the energy efficiency of compressor stations is currently an urgent problem in the gas industry. Increasing the pressure of the transported gas by compression with the use of gas turbine units as a compressor drive is the most energy-intensive heat-and-power process. The article discusses modern methods of increasing the energy efficiency of compressor s tations with gas pumping units operating based on gas turbine plants by utilizing the heat of exhaust gases from gas turbine plants. A complex system is considered, which includes a gas pumping unit, a gas turbine unit, a wa

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TUDOSIE, Alexandru-Nicolae, Emanuel DUMITRU, and Marius-Alin ASPRA. "CONTROL LAW FOR AN AIRCRAFT SUPERSONIC AIR INLET WITH INTERNAL COMPRESSION." SCIENTIFIC RESEARCH AND EDUCATION IN THE AIR FORCE 21, no. 1 (2019): 199–208. http://dx.doi.org/10.19062/2247-3173.2019.21.27.

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Swinfen-Styles, Lawrie, Seamus D. Garvey, Donald Giddings, Bruno Cárdenas, and James P. Rouse. "Analysis of a Wind-Driven Air Compression System Utilising Underwater Compressed Air Energy Storage." Energies 15, no. 6 (2022): 2142. http://dx.doi.org/10.3390/en15062142.

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The increasing push for renewable penetration into electricity grids will inevitably lead to an increased requirement for grid-scale energy storage at multiple time scales. It will, necessarily, lead to a higher proportion of the total energy consumed having been passed through storage. Offshore wind is a key technology for renewable penetration, and the co-location of energy storage with this wind power provides significant benefits. A novel generation-integrated energy storage system is described here in the form of a wind-driven air compressor feeding underwater compressed air energy storag

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Cheng, Lei, Yan Zhen Yu, and You Heng Zhao. "The Preparation of Pavement Brick and the Research on Compression Resistance." Applied Mechanics and Materials 295-298 (February 2013): 1789–92. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.1789.

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The chemical compositions of the Yellow River silt, coal gangue, air-float algae slag and the effect in pavement brick making were analyzed. The main factors which effect the compressive strength of the pavement brick was researched. The best pavement brick factor level combination by orthogonal experimental design was determined. The effects of air-float algae cement addition and sintering temperature on the compression resistance of the brick were discussed.

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V.C., Okafor. "THERMODYNAMIC ANALYSIS OF COMPRESSOR INLET AIR PRECOOLING TECHNIQUES OF A GAS TURBINE PLANT OPERATIONAL IN NIGERIA ENERGY UTILITY SECTOR." International Journal of Engineering Science Technologies 4, no. 2 (2020): 13–24. https://doi.org/10.5281/zenodo.3739635.

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Thermodynamic analysis of inlet air pre-cooling techniques of compressor is among the methods for the enhancement of gas turbine performance. This study compared the effect of using evaporative cooling system pre-cooling method, vapour compression refrigeration precooling and vapour absorption refrigeration precooling techniques to the gas turbine Net Power Output, Thermal efficiency, Thermal Efficiency Change factor (TEC) and Power Gain Ratio (PGR) taking into recognition the prevalent weather and climatic conditions of Nigeria and as well as optimization parameters for the reference system (

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Коновалов, Дмитро Вікторович, та Галина Олександрівна Кобалава. "ПРОМІЖНЕ ОХОЛОДЖЕННЯ ЦИКЛОВОГО ПОВІТРЯ В ГАЗОТУРБІННИХ УСТАНОВКАХ АЕРОТЕРМОПРЕСОРАМИ". Aerospace technic and technology, № 1 (25 лютого 2018): 29–36. http://dx.doi.org/10.32620/aktt.2018.1.02.

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Existing technologies to improve the fuel and energy efficiency of gas turbine plants due to intercooling of the cycle air are analyzed. One of the promising ways for increasing the efficiency of such technologies is using thermogasdynamic compression in the heat recovery processes of secondary energy resources. A feature of this process is the pressure rate increase due to the instant evaporation of a finely dispersed liquid is injected into the air stream which accelerated to the speed of sound. When the pressure of the boiling liquid is increased, the power consumption for compressing the w

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