Forming with working media Formen mit Wirkmedien Formatura mediante l’azione di mezzo attivo

2019 ◽  
pp. 555-573
Author(s):  
Keyword(s):  
Working Media

Improving the efficiency and reliability of electric power generation at incineration plants

2020 ◽  
Vol 12 (4) ◽  
pp. 281-285
Author(s):  
A. V. Martynov ◽  
N. E. Kutko
Keyword(s):  
Low Temperature ◽  
Power Plants ◽  
Thermal Power ◽  
Moscow Region ◽  
Capital Costs ◽  
Working Medium ◽  
The Creation ◽  
Working Media ◽  
Near Future ◽  
Efficiency And Reliability

The article deals with the problem of waste disposal and, accordingly, landfills in the Moscow Region, which have now become the number 1 problem for the environment in Moscow and the Moscow Region. To solve this problem, incineration plants (IP) will be established in the near future. 4 plants will be located in the Moscow Region that will be able to eliminate 2800 thousand tons of waste per year. Burning of waste results in formation of slag making 25% of its volume, which has a very high temperature (1300.1500°C). An arrangement is considered, in which slag is sent to a water bath and heats the water to 50.90°C. This temperature is sufficient to evaporate any low-temperature substance (freons, limiting hydrocarbons, etc.), whereupon the steam of the low-temperature working medium is sent to a turbine, which produces additional electricity. The creation of a low-temperature thermal power plant (TPP) increases the reliability of electricity generation at the IP. The operation of low-temperature TPPs due to the heat of slag is very efficient, their efficiency factor being as high as 40.60%. In addition to the efficiency of TPPs, capital costs for the creation of additional devices at the IP are of great importance. Thermal power plants operating on slag are just such additional devices, so it is necessary to minimize the capital costs of their creation. In addition to equipment for the operation of TPPs, it is necessary to have a working medium in an amount determined by calculations. From the wide variety of working media, which are considered in the article, it is necessary to choose the substance with the lowest cost.

“Going Virtual Helped Me Learn That I Can Handle Everything”: Campus Magazine Production as a High Impact Practice During the COVID-19 Pandemic

2021 ◽  
pp. 107769582110232
Author(s):  
Zoe L. Lance ◽  
Chelsea J. Reynolds
Keyword(s):  
Empirical Evidence ◽  
High Impact ◽  
Theoretical Frameworks ◽  
Staff Members ◽  
Course Planning ◽  
Virtual Instruction ◽  
Professional Self ◽  
Working Media ◽  
High Impact Practice

This case study documents a large, 4-year university magazine’s transition to virtual instruction during the initial months of the COVID-19 pandemic. Using theoretical frameworks from Kuh’s work on high impact practices (HIPs), this analysis offers empirical evidence that virtual student newsrooms may provide impactful learning experiences during crisis situations. Based on interviews, surveys, and newsroom observation, 23 magazine staff members reported improvements in their professional self-efficacy as they overcame logistics challenges and interpersonal hurdles similar to working media professionals. The case study also identifies strengths and weaknesses of crisis pedagogy. Implications for post-pandemic pedagogy and course planning are discussed.

Influence of Imperfections in the Working Media on Diesel Engine Indicator Process: Part 2 — Results

1998 ◽  
Author(s):  
Stanislav N. Danov ◽  
Ashwani K. Gupta
Keyword(s):  
Mathematical Model ◽  
Diesel Engine ◽  
High Pressures ◽  
Combustion Process ◽  
Ideal Gas ◽  
Working Medium ◽  
High Pressures And Temperatures ◽  
Specific Heat Capacities ◽  
Working Media ◽  
The Mathematical Model

Abstract In the companion Part 1 of this two-part series paper several improvements to the mathematical model of the energy conversion processes, taking place in a diesel engine cylinder, have been proposed. Analytical mathematical dependencies between thermal parameters (pressure, temperature, volume) and caloric parameters (internal energy, enthalpy, specific heat capacities) have been obtained. These equations have been used to provide an improved mathematical model of diesel engine indicator process. The model is based on the first law of thermodynamics, by taking into account imperfections in the working media which appear when working under high pressures and temperatures. The numerical solution of the simultaneous differential equations is obtained by Runge-Kutta type method. The results show that there are significant differences between the values calculated by equations for ideal gas and real gas under conditions of high pressures and temperatures. These equations are then used to solve the desired practical problem in two different two-stroke turbo-charged engines (8DKRN 74/160 and Sulzer-RLB66). The numerical experiments show that if the pressure is above 8 to 9 MPa, the working medium imperfections must be taken into consideration. The mathematical model presented here can also be used to model combustion process of other thermal engines, such as advanced gas turbine engines and rockets.

scholarly journals ENERGY SYSTEMS OF MARINE DIESEL POWER PLANTS: SUBSTANTIATION OF REQUIREMENTS FOR RELABILITY

2017 ◽  
pp. 40-48
Author(s):  
Irina Anatolievna Borovikova
Keyword(s):  
Mathematical Model ◽  
Power Plant ◽  
Control Systems ◽  
Power Plants ◽  
Energy Systems ◽  
Media Consumption ◽  
Reliability Indices ◽  
Emergency Situations ◽  
Working Media ◽  
Main Engine

The article touches upon reliability issues of energy management systems (EMS) of marine power plants in emergency situations caused by disturbance of the working media consumption and their subsequent recovery. The mathematical model of processes allows to determine the nature of changes in temperature and pressure of water and lube oil in EMS systems. The requirements to the characteristics of automatic control systems of the marine power plant have been formulated. Basic provisions of the reliability theory are followed by presentation of methods of calculating reliability indices of complex technical systems. The article presents the results of the study of non-stationary modes and reliability indices. Reasonable requirements for automated control systems were obtained through the analysis of working environments and of equipment operating in non-stationary modes, non-exceedance of safety limits of marine power plant operation being taken as the admissibility criterion. Besides, there are possible special modes resulted from emergency situations caused by the power plant equipment failure. Hence, for operation and design of the analyses it is important to study changes of working media in the circulation systems, which resulted from the failure of the pumps. Basic circuit of lubrication and cooling systems of the ship diesel power plants has been approved as recommended by the company "MAN B&W" for slow speed diesel engines standard series MC. Among the recommended schemes there was approved the scheme of the main engine with an autonomous cooling circuit. Schematic diagram of energy systems of a diesel power plant has been made under recommendations of the engine developer. Specifications of the component parts of the ship diesel power plant have been taken as standard for manufactured machinery. A low running L90MC-C four-cylinder main engine manufactured by "MAN B&W" was chosen as a research sample. A mathematical model, as applied to the given problem, consists of 10 algebraic equations for nonsteady working media consumption and 18 differential equations for nonsteady heat transfer in heat exchangers, as well as equations for transport delay in the lubrication systems of internal combustion engines.

scholarly journals Influence of the Working Media and Maneuvering Loading Mode on the Service Life of Spraying Booms of Field Sprinklers

2020 ◽  
Vol 56 (2) ◽  
pp. 166-173
Author(s):  
О. E. Andreikiv ◽  
А. V. Babii ◽  
І. Ya. Dolinska
Keyword(s):  
Service Life ◽  
Loading Mode ◽  
Working Media

scholarly journals Comparison and Mathematical Modelling of Leakage Tests

2019 ◽  
Vol 213 ◽  
pp. 02019
Author(s):  
Kamil Fojtášek ◽  
Lukáš Dvořák ◽  
Lukáš Krabica
Keyword(s):  
Pressure Drop ◽  
Mathematical Modelling ◽  
Mathematical Models ◽  
Industrial Applications ◽  
Compressed Air ◽  
Working Media

Leak tests are used in many industrial applications, a typical example are the headlights of cars. In these tests are use different principles and different working media. The monitored parameters are usually the amount of leakage media depending on the pressure drop and the time at which the leakage occurs. The article describes the possibility of performing leak tests using compressed air, their comparison and the subsequent creation of mathematical models.

A machine for programmed low-cycle fatigue testing of sheet material in working media

1976 ◽  
Vol 11 (2) ◽  
pp. 238-238
Author(s):  
K. B. Katsov ◽  
A. B. Kuslitskii ◽  
V. P. Rudenko ◽  
I. P. Pistun ◽  
I. V. Kokotailo ◽  
...  
Keyword(s):  
Fatigue Testing ◽  
Low Cycle Fatigue ◽  
Sheet Material ◽  
Cycle Fatigue ◽  
Working Media
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