MODELING OF FLOW AND TEMPERATURE FIELD IN AN ECONOMIZER

This article deals with the economizer as one of the main parts of a boiler. Economizers and air heaters perform a key function in providing high overall boiler thermal efficiency by recovering the low level energy from the flue gas before it is exhausted to the atmosphere. The most common and reliable economizer design is the bare-tube, in-line, cross-flow type. To reduce capital costs, most boiler manufacturers build economizers with a variety of designs to enhance the controlling gas-side heat transfer rate. From this point of view it creates a lack for an investigation and modeling of these parts

A Structure of the Cooling System

Some problems related to energetic flows in a cooling system of the combustion engine equipped with a non-conventional cooling circuit are described in this paper. The verification was carried out on a real diesel tractor engine by exploring the thermal balance. Actually, it is an assessment of the influence of alternative cooling liquid on the engine parameters with a particular attention to the flow of after-expansion energy into the cooling system for its further use. Thermal balance is evaluated by means of a reduced output number related to heat or energy chemically bound in fuel, energy led by the cooling system and energy corresponding to the effective output. The value of reduced output number gives attainable utility output per a supply unit of the given equipment (supposing that the energy of the coolant is used for the operation of other equipment, e.g. air-conditioning equipment).The improvement of the output number of the combustion engine as an energetic source can be achieved through the use of exergic part of energy transformed in the combustion engine

Nonconventional Principle of Conversion of Heat into Cold in an Internal Combustion Engine

The paper presents results achieved by a team of 12 researchers from the Faculty of Mechanical Engineering of the University of Žilina who participated in the solution of the project of the above-mentioned title within the period of the years 2002 - 2005. The basic research project focuses on the cooling internal combustion engine as an element of qualitatively new equipment designed for more effective utilization of fuel energy by a nonconventional progressive principle of heat conversion cooled by thermocompression. The issue of permanently sustainable life is approached from three hierarchical levels: a first level is a cooling internal combustion engine; a second level is a combined cogeneration complex power source; and a third level is a permanently sustainable power system. The cooling internal combustion engine is actually the basic element of the subsystem in the three-level complex of permanently sustainable life. It is still necessary to verify expected advantages of this unconventional combustion engine, potential savings of primary energy and foresee possible problems arisen during the simulation of the engine

The Impact of International Intrepreneurship on the Development of Transport

The article deals with the perspectives for the development of international entrepreneurship and the development of transport. Perspectives were determined based on research and the results of this research are presented in the article