2 research outputs found
Energy analysis of hydrogen as a fuel in the Czech Republic
ArticleThe concept of ‘hydrogen economy’ dates back to the 1970s. It was first introduced as
s response to the first oil crisis. In the context of the hydrogen economy, it is important to calculate
how much hydrogen would be needed to power all motor vehicles in the Czech Republic. This is
main topics of this paper. To calculate the amount of hydrogen, we used two different methods.
One is based on thermodynamic laws and the other on normal operating conditions. Both
approaches yielded comparable results. It was found out that even with the use of all the electricity
produced in the Czech Republic in 2016, we would not be able to cover the amount of energy
that is required for production. It would cover only 75% resp. 76% depending on the calculation
method used. Eventually, the Czech Republic could buy necessary amount of hydrogen and it
would cost between 11 and 29 billion euros which is between 6% and 16% of GDP of the Czech
Republic. In the calculations, authors found out that most fuel is burnt in the passenger cars.
Therefore, we made a sensitivity analysis to find out how much our results would differ if fuel
consumption changed. It turns out that with an increase in consumption of 1l per 100 km,
hydrogen production coverage will decrease by about 4% (again with the use of all electricity
produced in the Czech Republic)
Diagnostics of hydraulic fluids used in aviation
ArticleDiagnostics is a maintenance industry that monitors performance, parameters, and
follow
–
up. Diagnosing hydraulic fluids means comparing the parameters of the used hydr
aulic
fluid sample to the parameters of the clean fluid. It is also essentia
l to monitor the limit values
either by the aircraft manufacturer or by the manufacturer of the hydraulic fluid. This means
that the manufacturer recommends the limitations of the
liquid parameters. The measurements
of the fluid samples give an overview of the liquid quality. Most businesses focus on so
–
called
proactive maintenance. The main senses and objectives of proactive maintenance are: lubricant
sample analysis, lubricant sta
tus, machine status, next step recommendation, database saving
and trend analysis. This article focuses on the quality of hydraulic fluid focused in aviation. The
aim of the article was to determine the properties of the hydraulic fluid used in the A320 ai
rcraft
family, determine the interval of its exchange. Monitoring the state of the hydraulic fluid could
contribute to the timely detection of the problem, thus avoiding a failure of the device or the
system as a
whole. The tracking proposal is an integral
part of this article