Wyniki wyszukiwania - BazTech

1

Emissions of the combustion engine as a source of cold for its extreme intercooling

Hlavňa V., Krakovsky J.

Combustion Engines

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2013

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R. 52, nr 2

20--27

EN

This paper contains results of mathematical modeling connected with non-conventional energetic system using the cooling combustion engine (the engine cooling circle is the ejector of absorption cooling). We especially have focused on the influence of a more intensive cooling on the engine ecological parameters. The paper is a continuation of previous publications and focuses on the results of the designed mathematical model of particulate matter formation and its experimental verification under extreme intercooling. Our previous achievements were already presented on scientific conferences and in professional journals.

2

Specific features of automobile brake linings

Hlavňa V.

Archiwum Motoryzacji

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2013

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Nr 2

21--33, 137--149

EN

Braking of road vehicles can be characterized as an active - either wanted or unwanted reduction of the force necessary for maintaining the required speed, decreasing the speed, stopping or keeping the vehicle at a standstill. During braking the vehicle loses the acquired motion energy which is most frequently transformed (in case of wanted braking) in the brake system of the vehicle into useless heat released to the environment. Brake force can be defined as the force acting against the motion of a vehicle which is, in case of wanted braking produced by the vehicle braking system. In case of wanted braking we usually begin with the equilibrium equation of vehicle forces. The paper deals with objective findings and assessment of possible causes leading to the braking system failure paying special attention to the brake lining. The user can approach the brake lining failure from two points of view: being aware or unaware of it. Laboratory tests can be used to objectively assess characteristics of brake linings. Both operational and laboratory test are performed to detect characteristics of brake lining materials. Apart from theoretical considerations, the paper also contains results of experiments performed with different brake lining materials used for trucks and passenger automobiles.

3

Struktura systemu pomiarowego niekonwencjonalnego obwodu energetycznego

Hlavňa V.

Eksploatacja i Niezawodność

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2009

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nr 1

11-14

PL

W artykule omówiono automatyczny systemu pomiarowy, który zastosowano w niekonwencjonalnym obwodzie energetycznym. Podstawą niekonwencjonalnego obwodu energetycznego jest układ trójzmienny, w którym silnik spalinowy o zapłonie samoczynnym jest podstawowym źródłem energii. System ten produkuje energię elektryczną i energie ciepłą na trzech poziomych termicznych. Opisany system jest niekonwencjonalny ponieważ zastosowano niekonwencjonalny obwód chłodzenia silnika spalinowego, który zaprojektowano jako termokompresor dla absorpcji ciepła z tego obwodu.

EN

The paper deals with an automated measuring system implemented in a non-conventional energetic circuit. The basis of a non-conventional energetic circuit is a trivalent system in which the ignition combustion engine is the source of primary energy. The system produces electric and thermal energy at three thermal levels. The system is referred to as non-conventional because of the non-conventional cooling circuit of the combustion engine which has been designed as a thermo compressor for absorptive cooling circulation.

4

Energetic Assessment Of The Ship Non-Conventional Energetic Unit

Sojčák D., Hlavňa V., Piroch P.

Journal of Polish CIMAC

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2007

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Vol. 2, no 1

169-172

EN

The paper deals with a non-conventional energetic unit equipped with a cooling combustion engine designed as an element for qualitatively new equipment to achieve a more efficient utilization of energy chemically bound in fuel of the combustion engine by transformation of heat into cold via thermocompression. A simple example illustrates the advantage of a non-conventional energetic system from the point of view of a more efficient utilization of primary energy, i. e. the energy chemically bound in fuel.

5

A New Design Of Energetic Unit For Ships

Hlavňa V.

Journal of Polish CIMAC

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2007

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Vol. 2, no 1

165-168

EN

A new possibility of utilization of ICE cooling medium thermal capacity is its connection with the independent sorption cooling equipment by thermal pipe. Such a configuration avoids the use of a utilizable thermal gradient. This disadvantage of connection of the classical combustion engine with sorption cooling equipment is solved by a cooling internal combustion engine. Its basis lies in the fact that the chambers of the cooling jacket are simultaneously generator of the sorption cooling equipment. The classical engine becomes the sorption cooling equipment. Such an engine can be used for combined generation of electric energy, heat and cold. Cold can be used for the cooling of an engine charging air and for air conditioning of ships equipped with such an engine and cooling of food.

6

Ice with a non-conventional cooling system temperature mapping

Hlavňa V., Sojčak D., Istenik R.

Journal of KONES

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2007

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Vol. 14, No. 2

187-193

EN

Within the framework of the basic research task funded by the Agency for support of research and development we solve a problem of a more effective non-conventional usage of the part of energy taken away by the ICE cooling system. The energy is used for production of cold. Results ofpartial solutions and methodology of energetic evaluation have been already presented in various conferences and symposia as well as published in several professional journals. This contribution brings some newly acquired theoretical and practical experience gathered during the operation of a test laboratory sample of the cooling engine in a non-conventional energetic unit. Experiments were focused on temperature mapping. The basic scheme of a non-conventional energetic unit with a cooling engine, the view of a functional laboratory sample, surface temperature in the vicinity of evaporator - taken by thermal imaging, time course of changes in the engine torque, revolutions and temperature on the engine, temperatures in the evaporator, temperatures in the liquefier, temperatures in the absorber, temperatures in the evaporator, temperatures in the VBR exchanger are presented in the paper. The results of the experiment shown that there is a 10 - 15 % agreement with the results acquired through calculations. Theoretical assumptions and solutions carried out for the alternative cooling liquid of the cooling engine in a non-conventional energetic unit can be considered real. Within the framework of this consideration a test circuit is being prepared for experiments with alternative cooler.

7

Control of the air excess coefficient for the non-conventional engine

Hlavňa V., Sojčák D., Isteník R.

Journal of KONES

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2006

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Vol. 13, No. 2

117-124

EN

One of the elements significant for the testing of combustion engines is the equipment for measurement of air consumed by the engine. The air excess coefficient, which depends on air consumption, is an important variable required for classification of combustion processes and evaluation for engine gas emissions. The paper deals with the solution of a flow field of a designed non-standardized measuring element with the objective of measurements and control of the air excess coefficient of the non-conventional combustion engine. In particular test stand (combustion engine – absorptive cooling equipmen)t, measuring element of the suction section of the combustion engine, modeling of the boundary layer, distribution of velocities and pressure field, distribution of density and temperatures in the flow field, course of static pressure and velocity in the measuring element axis for the engine torque, velocity profiles in cross sections, regulation of y+ parameter, comparison of velocities in dependence on torque, comparison of mass flow and pressure difference, contour of kinetic turbulent energy m2.s-2 for standardized and non-standardized measuring element, search dependence are presented in the paper.

8

Circumfluence of the cylinder in a non-conventional combustion engine

Hlavňa V., Sojčák D.

Journal of KONES

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2006

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Vol. 13, No. 2

111-115

EN

When solving the project "A non-conventional energetic unit equipped with a cooling combustion engine" it was necessary to deal with flow and transfer of heat along the cylinder liner The contribution is a continuation of already published results gathered from experiments focused on the circumfluence of the combustion engine cylinder by a traditional cooler. The paper points out heat flows, velocity profiles, and turbulent intensity during the cylinder liner circumfluence by a non-conventional cooler – lithium bromide. Non-conventional cooling circuit of the engine, physical properties of the coolant for the engine (including specific heat capacity, absolute viscosity, density and thermal conductivity), model net, adaptation in the boundary layer area, velocity field in the vicinity of the inserted cylinder and the liner temperature profile from the side soaked with fluid, pressure field in the inserted cylinder chamber and temperature field of heat transfer, turbulent intensity on the cylinder liner and streamlines of the flow field are presented in the paper.The examined combustion engine will be able of a long-term operation when the alternate coolant is used

9

The vehicle comfort case study

Lack T., Gerlici J., Hlavňa V.

Eksploatacja i Niezawodność

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2006

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nr 4

89-91

EN

The paper relates closely to theoretical considerations of vehicle comfort assessment published in the journal Horizonty dopravy - special No. 2006 under the title " Evaluation of Ride Comfort for Passengers". It can be understood as application of the mentioned theoretical considerations - as a case study. Influence of vibration on a standing and sitting person is assesed in the case study.

10

Assessment methodology of a non-conventional cooling system

Hlavňa V., Sojčák D.

Journal of KONES

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2005

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Vol. 12, No. 1-2

97-102

EN

During experiments focused on cooperation of a non-conventional combustion engine featuring basic elements of absorptive cooling equipment that constitutes its non-conventional cooling circuit it is necessary to define methodology of assessment. The methodology of assessment comes out of the physical principal of cooling equipment and from the need to take away energy from the cooling system of the combustion engine. The methodology was prepared on the basis of the performance number – COP (Coefficient of Performance) of the system. The coefficient of performance defines quality of reconstruction and pressure-temperature relations necessary for a physical process to take place. The paper contains a description of determining the performance number for the particular test stand and experiment. Some results of assessment according to the specified methodology are also presented in the paper.

11

A measurement system for an energetic circuit with a non-conventional combustion engine

Istenik R., Hlavňa V., Labuda R.

Journal of KONES

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2004

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Vol. 11, No. 1-2

240-244

EN

The basis of a non-conventional energetic circuit is a trivalent system in which the ignition combustion engine is a source of primary energy. The system produces electric and thermal energy at tliree thermal levels. The system is referred to as non-conventional because of the non-conventional cooling circuit of the combustion engine which has been designed as a thermo compressor for absorptive cooling circulation. The paper deals with an automated measuring system implemented in the above-mentioned non-conventional energetic circuit.