Research on a Novel Miniature Air Compressor Generating both Compressed Air and Vacuum

2014 ◽  
Vol 1027 ◽  
pp. 253-256
Author(s):  
Jian Hai Han ◽  
Jie Zhang ◽  
Dong Liao Fu ◽  
Zhi Gang Hu
Keyword(s):  
Vacuum Pump ◽  
Operating Principle ◽  
Experimental Results ◽  
System Structure ◽  
Compressed Air ◽  
The Novel ◽  
Pump Mode ◽  
Air Compressor

A new kind of miniature air compressor is proposed in this paper. This compressor can produce both compressed air and vacuum. The system structure, operating principle and experimental characteristics of the novel miniature air compressor are described in detail. The experimental results prove that the shift between air compressor mode and vacuum pump mode is possible and the design of system structure is appropriate.

scholarly journals Experimental Investigation and Mathematical Modelling of Pressure Transfer Function for Air Compressor

2018 ◽  
Vol 7 (4.19) ◽  
pp. 950
Author(s):  
Mishaal A. AbdulKareem
Keyword(s):  
Pressure Response ◽  
Compressed Air ◽  
Operating Pressure ◽  
Perfect Gas ◽  
Cross Sectional ◽  
Air Compressor ◽  
Output Pressure ◽  
Sinusoidal Functions ◽  
Good Agreement ◽  
Pressure Switch

A mathematical model is developed to estimate the pressure response of an insulated electric air compressor. A pressure switch is modeled as a comparator and the electric motor as an amplifier. It is assumed that the compressed air is a perfect gas when applying the isentropic process. In addition, the effect of a step, ramp and sinusoidal functions of disturbance signals on the air pressure has been studied.  A good agreement was obtained when comparing the predicted results with the measured values obtained from the experimental test that was done using a (1.32 kW, 23 litter and 8 bar) electric reciprocating air compressor. In addition, the same behavior of the predicted results was obtained when compared with results of a previously published article. It was found that the time constant of this control system is directly proportional with the value of the spring constant that is inserted inside the pressure switch and with the volume of air storage vessel, and it is inversely proportional with the gain of the amplifier and with the effective cross-sectional area of the pressure switch diaphragm and it is independent of the value of operating pressure set point. In addition, when the value of disturbance signal is positive, it will increase the output pressure response and when it is negative, it will decrease it. 

Energy Consumption and Energy Saving Research Status of Air Compressor System

2014 ◽  
Vol 628 ◽  
pp. 225-228
Author(s):  
Xiao Lin Tian ◽  
Shou Gen Hu ◽  
Hong Bo Qin ◽  
Jun Zhao ◽  
Ling Yuan Ran
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Energy Saving ◽  
Compressed Air ◽  
Efficiency Evaluation ◽  
Air Compressor ◽  
Research Status ◽  
Air System ◽  
Energy Efficiency Evaluation ◽  
At Home

As the most widely used fourth energy, compressed air system has high operating costs. The research about energy consumption and energy optimization measures of compressed air system has become the new field to achieve energy saving among countries all over the world. In recent years, air compressor system researches in energy consumption, influence factors, energy saving technologies and energy efficiency evaluation have been carried out at home and abroad, and some achievements have been achieved. This paper summarizes energy consumption research status of air compressor system at home and abroad, and energy-saving technologies of compressed air in generation link, treatment link and gas link, and energy efficiency evaluation methods for of air compressor systems. Potentials and drawbacks of current researches are analyzed simultaneously. In the end energy-saving development directions of air compressor system are predicted.

scholarly journals Experimental Determination of the Performances during the Cold Start-Up of an Air Compressor Unit for Electric and Electrified Heavy-Duty Vehicles

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3664
Author(s):  
Gianluca Valenti ◽  
Stefano Murgia ◽  
Ida Costanzo ◽  
Matteo Scarnera ◽  
Francesco Battistella
Keyword(s):  
Volume Flow Rate ◽  
Cold Start ◽  
Input Power ◽  
Compressed Air ◽  
Compressor Unit ◽  
Heavy Duty ◽  
Air Compressor ◽  
Start Up ◽  
Heavy Duty Vehicle ◽  
Heavy Duty Vehicles

Compressed air is crucial on an electric or electrified heavy-duty vehicle. The objective of this work was to experimentally determine the performance parameters of the first prototype of an electric-driven sliding-vane air compressor, specifically designed for electric and electrified heavy-duty vehicles, during the transient conditions of cold start-ups. The transient was analyzed for different thermostatic temperatures: 0 °C, −10 °C, −20 °C, and −30 °C. The air compressor unit was placed in a climatic chamber and connected to the electric grid, the water-cooling loop, and the compressed air measuring and controlling rig. The required start-up time was greater the lower the thermostatic temperature, ranging from 30 min at 0 °C to 221 min at −30 °C and depending largely on the volume of the lubricant oil filled initially. The volume flow rate of the compressed air was lower than nominal at the beginning, but it showed a step increase well beyond nominal when the oil reached 50 °C and then decreased gently towards nominal, while the input power kept steady at nominal after a short initial peak. These facts must be considered when estimating the time and the energy required by the air compressor unit to fill up the compressed air tanks of the vehicles.

Nonlinear Controller Design With Bandwidth Consideration for a Novel Compressed Air Energy Storage System

2013 ◽  
Author(s):  
Mohsen Saadat ◽  
Farzad A. Shirazi ◽  
Perry Y. Li
Keyword(s):  
Energy Storage ◽  
Storage System ◽  
High Energy ◽  
Compressed Air ◽  
Compressed Air Energy Storage ◽  
Nonlinear Controller ◽  
Air Compressor ◽  
Storage Vessel ◽  
Hydraulic Transformer ◽  
Liquid Piston

Maintaining the accumulator pressure regardless of its energy level and tracking the power demanded by the electrical grid are two potential advantages of the Compressed Air Energy Storage (CAES) system proposed in [1, 2]. In order to achieve these goals, a nonlinear controller is designed motivated by an energy-based Lyapunov function. The control inputs of the storage system include displacement of the pump/motor in the hydraulic transformer and displacement of the liquid piston air compressor/expander. While the latter has a relatively low bandwidth, the former is a faster actuator with a higher bandwidth. In addition, the pneumatic path of the storage vessel that is connected to the liquid piston air compressor/expander has a high energy density, whereas the hydraulic path of the storage vessel is power dense. The nonlinear controller is then modified to achieve a better performance for the entire system according to these properties. In the proposed approach, the control effort is distributed between the two pump/motors based on their bandwidths: the hydraulic transformer reacts to high frequency events, while the liquid piston air compressor/expander performs a steady storage/regeneration task. As a result, the liquid piston air compressor/expander will loosely maintain the accumulator pressure ratio and the pump/motor in the hydraulic transformer will precisely track the desired generator power. This control scheme also allows the accumulator to function as a damper in the storage system by absorbing power disturbances from the hydraulic path generated by wind gusts.

Modeling and Trajectory Optimization of Water Spray Cooling in a Liquid Piston Air Compressor

2013 ◽  
Author(s):  
Mohsen Saadat ◽  
Farzad A. Shirazi ◽  
Perry Y. Li
Keyword(s):  
Trajectory Optimization ◽  
Optimization Problem ◽  
Pressure Ratio ◽  
Practical Method ◽  
Compressed Air ◽  
Maximum Efficiency ◽  
Mass Ratio ◽  
Water Droplets ◽  
Air Mass ◽  
Air Compressor

An efficient and sufficiently power dense air compressor/expander is the key element in a Compressed Air Energy Storage (CAES) approach. Efficiency can be increased by improving the heat transfer between air and its surrounding materials. One effective and practical method to achieve this goal is to use water droplets spray inside the chamber when air is compressing or expanding. In this paper, the air compression cycle is modeled by considering one-dimensional droplet properties in a lumped air model. While it is possible to inject water droplets into the compressing air at any time, optimal spray profile can result in maximum efficiency improvement for a given water to air mass ratio. The corresponding optimization problem is then defined based on the stored energy in the compressed air and the required input works. Finally, optimal spray profile has been determined for various water to air mass ratio using a general numerical approach to solve the optimization problem. Results show the potential improvement by acquiring the optimal spray profile instead of conventional constant spray flow rate. For the specific compression chamber geometry and desired pressure ratio and final time used in this work, the efficiency can be improved up to 4%.

scholarly journals Analisis Kinerja Sistem Kompresor Udara Botol Angin Sebagai Sumber Pembangkit Generator Di Laboratorium Engine Hall Politeknik Ilmu Pelayaran Makassar

2021 ◽  
Vol 19 (1) ◽  
pp. 25
Author(s):  
Syahrisal Syahrisal
Keyword(s):  
Mass Flow Rate ◽  
Output Power ◽  
Mass Flow ◽  
Flow Rate ◽  
Quantitative Method ◽  
Compressed Air ◽  
Auxiliary Equipment ◽  
Air Mass ◽  
Air Compressor ◽  
Air Supply

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 is that the smaller the pressure exerted when compressing the air into the wind bottle, the smaller the mass of air that enters the wind bottle, likewise the greater the pressure exerted during compression, the greater the mass that enters the wind bottle (202, 65 kPa with an air mass of 1.0393 kg and 2431.8 kPa with an air mass of 12.162 kg). The smaller the pressure exerted when compressing the air to the wind bottle, the greater the mass flow rate of air in the tube (202.65 kPa with an air mass flow rate of 0.0297 kg/sec and 2431.8 kPa with an air mass flow rate of 0.0115 kg / sec). The greater the sistem output power, the greater the efficiency of the compressor sistem and the smaller the sistem output power, the smaller the efficiency of the compressor sistem (1000 Watt with an efficiency of 26.311% and 218 Watt with an efficiency of 5.742%).

Some Psychometric Aspects of a Hydraulic Air Compressor (HAC)

1982 ◽  
Vol 104 (3) ◽  
pp. 274-276
Author(s):  
Li-Ting Chen ◽  
W. Rice
Keyword(s):  
Water Temperature ◽  
Compression Ratio ◽  
Absolute Humidity ◽  
The State ◽  
Compressed Air ◽  
Compression Process ◽  
Air Compressor

In a hydraulic air compressor the air is surrounded by water during the compression process which is virtually isothermal. Depending on the state of the inlet air, the compressor water temperature, and the compression ratio, the compressed air may have higher or lower absolute humidity than that of the inlet air. Relationships between the two humidities are developed and criteria for “drying” to occur are presented.

Thermodynamic Analysis of a Steam Injected and Recuperated Gas Turbine Air Compressor

2012 ◽  
Author(s):  
Matthew J. Blom ◽  
Ashley P. Wiese ◽  
Michael J. Brear ◽  
Chris Manzie ◽  
Anthony Kitchener
Keyword(s):  
Gas Turbine ◽  
Thermodynamic Analysis ◽  
Gas Turbines ◽  
Pressure Ratio ◽  
Significant Proportion ◽  
Steam Injection ◽  
Compressed Air ◽  
Promising Alternative ◽  
Air Compressor ◽  
Compact Size

Compressed air and steam are perhaps the most significant industrial utilities after electricity, gas and water, and are responsible for a significant proportion of global energy consumption. Microturbine technology, in the form of a Gas Turbine Air Compressor (GTAC), offers a promising alternative to traditional, electrically driven air compressors providing low vibration, a compact size, reduced electrical consumption and potentially reduced greenhouse gas emissions. With high exhaust temperatures, gas turbines are well suited to the cogeneration of steam. The compressed air performance can be further increased by injecting some of that cogenerated steam or by conventional recuperation. This paper presents a thermodynamic analysis of various forms of the GTAC cycle incorporating steam cogeneration, steam injection (STIGTAC) and recuperation. The addition of cogeneration leads to improved energy utilisation, while steam injection leads to a significant boost in both the compressed air delivery and efficiency. As expected, for a low pressure ratio device, recuperating the GTAC leads to a significant increase in efficiency. The combination of steam injection and recuperation forms a recuperated STIGTAC with increased compressed air performance over the unrecuperated STIGTAC at the expense of reduced steam production. Finally, an analysis using a simplified model of the STIGTAC demonstrates a significant reduction in CO2 emissions, when compared to an equivalent air compressor driven by primarily coal-based electricity and a natural gas fired boiler.

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