scholarly journals A study of the effectiveness and energy efficiency of ultrasonic emulsification

2018 ◽  
Vol 20 (1) ◽  
pp. 86-96 ◽  
Author(s):  
Wu Li ◽  
Thomas S. H. Leong ◽  
Muthupandian Ashokkumar ◽  
Gregory J. O. Martin
Keyword(s):  
Energy Efficiency ◽  
High Pressure ◽  
Ultrasonic Emulsification

Theoretical and experimental aspects of the energy efficiency of ultrasonic emulsification were investigated and compared with conventional high-pressure homogenisation.

The Research on the Application of Two Kinds of Light Sources in the Training Venue for Physical Education of Universities

2012 ◽  
Vol 430-432 ◽  
pp. 1786-1790 ◽  
Author(s):  
Shu Fang Li
Keyword(s):  
Energy Efficiency ◽  
High Pressure ◽  
Physical Education ◽  
Lighting Design ◽  
Light Sources ◽  
Metal Halide Lamp ◽  
Sodium Lamp ◽  
Electric Light ◽  
High Pressure Sodium Lamp ◽  
Power And Energy

The energy efficiency experiment of electric light is implemented according to the lighting design of the physical training venues. In the experiment, the corresponding illumination, power and energy efficiency ratio of the commonly used high pressure sodium lamp and metal halide lamp which work under the voltage ranging from 187V to 234V are experimentally measured and the lighting effect characteristics of the two kinds of electric light sources compared, proving that the high pressure sodium light source should be employed in the training venue for physical education of universities.

scholarly journals Analysis of operating conditions of a cooling installation with carbon dioxide

2019 ◽  
Vol 100 ◽  
pp. 00005
Author(s):  
Artur Bieniek ◽  
Łukasz Mika ◽  
Jan Kuchmacz
Keyword(s):  
Carbon Dioxide ◽  
Energy Efficiency ◽  
High Pressure ◽  
Thermodynamic Properties ◽  
Ambient Temperature ◽  
Air Temperature ◽  
Operating Conditions ◽  
Efficiency Ratio ◽  
Summer Period ◽  
International Regulations

In response to international regulations, natural refrigerants such as carbon dioxide are more and more frequently used in the refrigeration industry. Due to thermodynamic properties, R-744 is used in the transcritical cycle as an individual refrigerant. In the hereby article, high pressure of CO2 and air temperature values were analysed. The measurements were conducted on the gas cooler side and involved external air temperature values in the summer period between 1 June to 30 September 2018. The “Booster” installation was used in one of Polish supermarkets. Correlations required to determine the optimal pressure of carbon dioxide depending on ambient temperature were presented in the article. The equations presented hereby allowed to maximize the energy efficiency ratio. An optimal high pressure for one of the correlations from literature was calculated on the basis of the measurement of ambient temperature. Actual and optimal pressure values of carbon dioxide were compared in the analysed period of time.

Exergy Analysis of a Compressor Assisted Triple-Effect Absorption Refrigerating Cycle

2013 ◽  
Vol 405-408 ◽  
pp. 2975-2979 ◽  
Author(s):  
Chun Jing Geng ◽  
Ying Fu Liu
Keyword(s):  
Energy Efficiency ◽  
High Pressure ◽  
Thermodynamic Analysis ◽  
Exergy Analysis ◽  
Lithium Bromide ◽  
Low Pressure ◽  
Effective Solution ◽  
Pressure Generator

Adding a compressor to basic in-counter-series triple-effect lithium bromide absorption refrigerating cycle is an effective solution to reduce the temperature of high pressure generator and slow down the corrosion situation. Exergy analysis based on thermodynamic analysis shows that the compressor placed between the low pressure generator and the condenser is the best, which help the system get the highest energy efficiency.

Evaluation of energy efficiency in cutting aerospace materials with high-pressure cooling lubricant supply

2014 ◽  
Vol 15 (6) ◽  
pp. 1179-1185 ◽  
Author(s):  
Fritz Klocke ◽  
Dieter Lung ◽  
Tolga Cayli ◽  
Benjamin Döbbeler ◽  
Hubertus Sangermann
Keyword(s):  
Energy Efficiency ◽  
High Pressure ◽  
Aerospace Materials ◽  
Cooling Lubricant

Dynamic Model of Compression Refrigeration System with a High Pressure Receiver

2011 ◽  
Vol 130-134 ◽  
pp. 575-579
Author(s):  
Wen Peng Zhai ◽  
Ai Guo Wu ◽  
Yu Wen You
Keyword(s):  
Optimal Control ◽  
Energy Efficiency ◽  
High Pressure ◽  
Energy Consumption ◽  
Dynamic Model ◽  
Control Design ◽  
Building Energy ◽  
Vapor Compression ◽  
Refrigeration System ◽  
Part Load

Vapor compression chiller, the largest proportion of building energy consumption as the design and running characteristics, work at part load for most of the time. To improve the energy efficiency at part load, this thesis details some efforts to develop a dynamic model of a vapor compressor system suitable for optimal control design purpose. It present the model of high pressure liquid receiver which is important for the mass balance of the whole system and make sure it operated in a set-point designed. Additional experiments were also performed to verify the precision of the model.

scholarly journals Measures to Improve the Energy Efficiency of Street Lighting Systems in the Kharkiv City

2021 ◽  
Vol 60 (2) ◽  
pp. 39-46
Author(s):  
Olena Didenko ◽  
Krystyna Suvorova ◽  
Olena Liashenko ◽  
Maria Sukhonos ◽  
Maria Liubchenko
Keyword(s):  
Energy Efficiency ◽  
High Pressure ◽  
Energy Saving ◽  
Light Sources ◽  
Lighting System ◽  
Monitoring And Control ◽  
Investment Activity ◽  
Street Lighting ◽  
Improve Energy Efficiency ◽  
The Road

High-quality street lighting improves visual perception of the road and provides for a significant decrease in the number of road accidents. It has been established that the total number of accidents can be reduced by 30% for national roads and by 45% for especially hazard areas (e.g., at intersections). Doubling of the average luminance of the road surface significantly reduces the number of accidents in the dark and twilight. Sufficient street lighting contributes to: reducing electricity consumption; decreasing operating costs; improving the environmental situation; promoting business, tourism and investment activity; decreasing the number of criminal offenses. The analysis of recent research and publications helped choose the best European practices which can be used to improve the outdoor lighting in Ukraine. The street lighting network is continuously growing and being modernized. Different types of light sources are being used in the network to illuminate the city. Today, high-pressure lamps (HPS) are leading. They are increasingly replaced by LED light sources. Not a small share is accounted for by metal-halide lamps. The smallest number of light sources in the street lighting system, high-pressure mercury and compact fluorescent lamps (CFLs). To increase the efficiency of the street lighting system and reduce energy consumption for its operation, measures for its reconstruction and modernization are required. For this purpose, it is necessary to address the following problems: high level of obsolescence and physical wear and tear of system elements; inefficient use and high losses of electricity at the stages of transportation and consumption, due to the use of obsolete and worn-out equipment; suboptimal distribution of the utility capacity, which leads to ineffective use of the existing lighting system; low efficiency of the street lighting control system, due to the lack of electric meters and remote monitoring and control of the street lighting. Introduction of energy-saving types of light sources is one of the ways to modernize the existing street lighting system. It is necessary to replace old lighting fixtures, which have already exhausted their life span, by new energy-saving light sources (replace CFLs by LEDs), use automatic control systems. All this in turn will help reduce energy costs by 60%. To improve energy efficiency of the street lighting system, it is also recommended to carryout the replacement of electromagnetic ballasts by electronic ones. The employment of electronic ballasts, e.g., in case of using HPS 250 lamps, allows to save approximately 255 kWh/year. Considering that the price per kW of electric energy is UAH 2.68, one luminaire helps save the amount of UAH 683.4 per year.

scholarly journals Theoretical and Experimental Studies of a Digital Flow Booster Operating at High Pressures and Flow Rates

Processes ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 211 ◽  
Author(s):  
Chenggang Yuan ◽  
Vinrea Lim Mao Lung ◽  
Andrew Plummer ◽  
Min Pan
Keyword(s):  
Energy Efficiency ◽  
High Pressure ◽  
Flow Rate ◽  
High Energy ◽  
Control Flow ◽  
Fluid Power ◽  
Analytical Models ◽  
Operating Pressure ◽  
Hydraulic Systems ◽  
Flow Rates

The switched inertance hydraulic converter (SIHC) is a new technology providing an alternative to conventional proportional or servo-valve-controlled systems in the area of fluid power. SIHCs can adjust or control flow and pressure by means of using digital control signals that do not rely on throttling the flow and dissipation of power, and provide hydraulic systems with high-energy efficiency, flexible control, and insensitivity to contamination. In this article, the analytical models of an SIHC in a three-port flow-booster configuration were used and validated at high operating pressure, with the low- and high-pressure supplies of 30 and 90 bar and a high delivery flow rate of 21 L/min. The system dynamics, flow responses, and power consumption were investigated and theoretically and experimentally validated. Results were compared to previous results achieved using low operating pressures, where low- and high-pressure supplies were 20 and 30 bar, and the delivery flow rate was 7 L/min. We concluded that the analytical models could effectively predict SIHC performance, and higher operating pressures and flow rates could result in system uncertainties that need to be understood well. As high operating pressure or flow rate is a common requirement in hydraulic systems, this constitutes an important contribution to the development of newly switched inertance hydraulic converters and the improvement of fluid-power energy efficiency.

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