Characterization of Commercially Available Turbochargers for Possible Application in the UPS System Scenario

2006 ◽  
Author(s):  
Bruno Facchini ◽  
Lorenzo Tarchi ◽  
Pier Francesco Piccardi
Keyword(s):  
High Speed ◽  
Low Cost ◽  
Expansion Ratio ◽  
Base Stations ◽  
Storage Device ◽  
Mechanical Resistance ◽  
Uninterruptible Power Supply ◽  
Environmental Requirements ◽  
Uninterruptible Power ◽  
Set Up

Standard uninterruptible power supply (UPS) systems for radio base stations use lead acid batteries stacks as energy storage device; the fairly short life cycle of such systems, not more than 3 years, together with the presence of highly polluting components make it costly in terms of money and environmental aspects. From these considerations originate the idea to develop an alternative UPS system based on compressed air storage able to replace the battery stacks and to satisfy more restrictive environmental requirements. This work is developed within the European project PNEUMA (PNEumatic Uninterruptible Machine - LIFE 04 ENV/IT/00595) with the final aim to develop some UPS demonstrators for an on site experimentation. In this paper it is described the way followed to set up an air turboalternator with a maximum power of 10.0 kW. Starting from the selection of the turbine, we decided to extract it from an ICE turbocharger because its size and its low cost matches our requirements. First of all, an experimental survey has been realized to test two turbines of different size: expansion ratio, corrected mass flow and efficiency have been measured varying inlet pressure and temperature. This activity led us to select the smaller turbine to develop the first pilot demonstrator; the turbine has been coupled to an high speed alternator (max. 60’000 rpm) by means of an elastic coupling. Some shakedown testing have been performed to verify the mechanical resistance and to test the power conversion system and the control system.

Suggestions in Ensuring the Safety of UPS Power Supply

2012 ◽  
Vol 461 ◽  
pp. 772-774
Author(s):  
Xue Mei Dai ◽  
Yu Fu
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
Storage Device ◽  
Practical Application ◽  
Constant Frequency ◽  
Uninterruptible Power Supply ◽  
Uninterruptible Power ◽  
Main Component

UPS (Uninterruptible Power System) is an energy storage device, and it is also a uninterruptible power supply which contains the inverter as the main component and works at the constant voltage constant frequency. it is playing an increasingly important role. Some suggestions are mainly proposed to ensure the safety of UPS power supply system in this paper, which make the UPS power supply system really play the role of escort in the practical application.

scholarly journals DC UPS for Critical Loads

2015 ◽  
Vol 5 (2) ◽  
pp. 231
Author(s):  
Ganesh S ◽  
Chiranjit Ghosh T ◽  
Kokilasree R ◽  
Nandhakumar M ◽  
Md Haroon Alim T
Keyword(s):  
Power Supply ◽  
Low Cost ◽  
Uninterruptible Power Supply ◽  
Critical Data ◽  
Power Failure ◽  
Switching Losses ◽  
Dc Power ◽  
Full Power ◽  
Switched Mode Power Supply ◽  
Uninterruptible Power

<p>The usual way to avoid a computer shutdown during a mains failure is to connect an  uninterruptible power supply system (UPS), which can be suitably modified and fitted inside the computer cabinet by the use of proposed methodology known as a dc UPS.  Conventional desk top UPS systems store electricity in form of chemical energy in batteries and when ever mains fail the batteries provide DC power which is then converter to ac by inverter and then fed to the computer in order to save critical data.  Thus power from mains or from UPS is fed to switched mode power supply unit which converts it to dc to  supply the computer motherboard and accessories.  Leaving the case of the computer powered by mains, duing power failure the dc power is unnecessarily converted to ac and then to dc again in SMPS hence high switching losses and heat is produced there by making the entire system very lowe efficient.  In this work it is proposed to directly feed the dc power from the battery to the computer SMPS system by building a UPS arrangement within the computer system.  This not noly saves space, it is highly efficient compared to the conventional ups system, easy to carry, low cost and reliable since there is no change over operation is required/.  A complete design of an ac to dc power supply with an internal dc UPS is presented in this paper. . A prototype has been fully developed and tested as a PC power supply. Thus the result is achieved at full power about 6-8 minutes.</p>

scholarly journals Continuous Battery Health Diagnosis by On-Line Internal Resistance Measuring

Energies ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2836
Author(s):  
Jaime de la Peña Llerandi ◽  
Carlos Sancho de Mingo ◽  
José Carpio Ibáñez
Keyword(s):  
Low Cost ◽  
Internal Resistance ◽  
Uninterruptible Power Supply ◽  
Voltage Ripple ◽  
Heavy Equipment ◽  
Board Monitoring ◽  
On Line ◽  
Uninterruptible Power ◽  
Current Ripple ◽  
Health Diagnosis

Energy storage in an uninterruptible power supply (UPS) is one of the most frequent applications of batteries. This can be found in hospitals, communication centers, public centers, ships, trains, etc. Most frequent industrial methods for battery state-of health estimation require a technician to move to the battery’s location and, in some cases, require the use of heavy equipment and disconnection of the battery from the UPS. For example, in railway applications, trains must stop at the maintenance depot producing significant total costs. This article proposes a new method to assess a battery’s health by measuring the battery’s internal resistance, based on the measurement of its voltage ripple in response to the current ripple imposed by the charger which in most UPS applications is permanently connected to the battery. Unlike most traditional methods, this system makes it possible a continuous on-line and on-board monitoring, and, therefore, it eases condition-based maintenance (CBM). To verify its viability, a low cost measuring prototype has been built and measurements in a railway battery with its charger have been carried out.

A Single-Stage DC Uninterruptible Power Supply

2015 ◽  
Vol 764-765 ◽  
pp. 466-470
Author(s):  
Maoh Chin Jiang ◽  
Bing Jyun Shih
Keyword(s):  
Power Factor ◽  
Power Supply ◽  
Output Voltage ◽  
High Efficiency ◽  
Low Cost ◽  
Single Stage ◽  
Normal Operation ◽  
Uninterruptible Power Supply ◽  
Sinusoidal Input ◽  
Uninterruptible Power

A single-stage DC uninterruptible power supply (UPS) is proposed in this paper. Basically, the proposed converter is an integration result of a power factor correction circuit with a dc-to-dc converter to achieve simple hardware circuit, high efficiency, and low cost for extra UPS function. Under normal operation, a novel two-switch SEPIC converter operates as an ac to dc converter with sinusoidal input current, unity power factor, and low ripple dc output voltage, and as a battery charger if a battery is added. Since both the input boost supply and the output supply can be controlled independently, a fast transient response can be maintained at both the input for active current wave shaping and at the output for good output regulation. When the ac source is in an outage condition, the proposed converter functions as a dc-to-dc buck-boost converter; therefore, the desired dc output voltage can be provided. Finally, some experimental results are presented for verification.

Development and production experience of the multilayer curtain-coated linerboard of Ji’an PM No. 3,

TAPPI Journal ◽  
2014 ◽  
Vol 13 (2) ◽  
pp. 17-25
Author(s):  
JUNMING SHU ◽  
ARTHAS YANG ◽  
PEKKA SALMINEN ◽  
HENRI VAITTINEN
Keyword(s):  
Titanium Dioxide ◽  
High Speed ◽  
Food Packaging ◽  
Production Efficiency ◽  
Positive Impact ◽  
Low Cost ◽  
Board Structure ◽  
Flexographic Printing ◽  
Curtain Coating ◽  
Coating Formulations

The Ji’an PM No. 3 is the first linerboard machine in China to use multilayer curtain coating technology. Since successful startup at the end of 2011, further development has been carried out to optimize running conditions, coating formulations, and the base paper to provide a product with satisfactory quality and lower cost to manufacture. The key challenges include designing the base board structure for the desired mechanical strength, designing the surface properties for subsequent coating operations, optimizing the high-speed running of the curtain coater to enhance production efficiency, minimizing the amount of titanium dioxide in the coating color, and balancing the coated board properties to make them suitable for both offset and flexographic printing. The pilot and mill scale results show that curtain coating has a major positive impact on brightness, while smoothness is improved mainly by the blade coating and calendering conditions. Optimization of base board properties and the blade + curtain + blade concept has resulted in the successful use of 100% recycled fiber to produce base board. The optical, mechanical, and printability properties of the final coated board meet market requirements for both offset and flexographic printing. Machine runnability is excellent at the current speed of 1000 m/min, and titanium dioxide has been eliminated in the coating formulations without affecting the coating coverage. A significant improvement in the total cost of coated white liner production has been achieved, compared to the conventional concept of using virgin fiber in the top ply. Future development will focus on combining low cost with further quality improvements to make linerboard suitable for a wider range of end-use applications, including frozen-food packaging and folding boxboard.

Development of a Capacitor Probe to Detect Subsurface Deterioration in Concrete

1997 ◽  
Vol 503 ◽  
Author(s):  
B. K. Diefenderfer ◽  
I. L. Al-Qadi ◽  
J. J. Yoho ◽  
S. M. Riad ◽  
A. Loulizi
Keyword(s):  
Dielectric Constant ◽  
Portland Cement ◽  
Electromagnetic Waves ◽  
Low Cost ◽  
Complex Dielectric Constant ◽  
Life Cycle Costs ◽  
Parallel Plates ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Set Up

ABSTRACTPortland cement concrete (PCC) structures deteriorate with age and need to be maintained or replaced. Early detection of deterioration in PCC (e.g., alkali-silica reaction, freeze/thaw damage, or chloride presence) can lead to significant reductions in maintenance costs. However, it is often too late to perform low-cost preventative maintenance by the time deterioration becomes evident. By developing techniques that would enable civil engineers to evaluate PCC structures and detect deterioration at early stages (without causing further damage), optimization of life-cycle costs of the constructed facility and minimization of disturbance to the facility users can be achieved.Nondestructive evaluation (NDE) methods are potentially one of the most useful techniques ever developed for assessing constructed facilities. They are noninvasive and can be performed rapidly. Portland cement concrete can be nondestructively evaluated by electrically characterizing its complex dielectric constant. The real part of the dielectric constant depicts the velocity of electromagnetic waves in PCC. The imaginary part, termed the “loss factor,” describes the conductivity of PCC and the attenuation of electromagnetic waves.Dielectric properties of PCC have been investigated in a laboratory setting using a parallel plate capacitor operating in the frequency range of 0.1 to 40.1MIHz. This capacitor set-up consists of two horizontal-parallel plates with an adjustable separation for insertion of a dielectric specimen (PCC). While useful in research, this approach is not practical for field implementation. A new capacitor probe has been developed which consists of two plates, located within the same horizontal plane, for placement upon the specimen to be tested. Preliminary results show that this technique is feasible and results are promising; further testing and evaluation is currently underway.

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