Some Facts Resulting from the Key Variables Used in the Description of the Recuperative Heat Exchangers
Journal Title: Strojnicky casopis - Journal of Mechanical Engineering - Year 2018, Vol 68, Issue 3
Abstract
There are the various types of heat exchangers. The selection of the heat exchanger right type is the first basic assumption for its optimal operation. The heat exchanger calculation itself is another prerequisite for its optimal operation. This article deals with the variables which are usually used to describe the stationary operation of any recuperative heat exchanger with two incoming and two outgoing streams. The knowledge of these variables, including the facts resulting from them, is necessary not only from the point of view of the calculation but also from the point of view of the evaluation of the experimental data of any heat exchanger. The variables values needed for the calculation of heat exchangers, so-called key variables, must always fall within the values range determined on the basis of generally valid knowledge about heat exchangers. The article also deals with the determination of the limit values defining the values range of these key variables.
Authors and Affiliations
Štefan Gužela and František Dzianik
The Calculation of the Contact Force and the Contact Width of Shaft Seals
The aim of the article is to point out the sealing efficiency of the two-language seal of the water pump bearing when radially deflecting the shaft within radial clearance. In order to obtain a radial displacement of th...
The Investigation of the Cavitation Phenomenon in the Laval Nozzle with Full and Partial Surface Wetting
The article deals with the cavitation phenomenon affected by full and partial wetting of the wall. For the numerical computation of flow in the Laval nozzle the Schnerr-Sauer cavitation model was tested and was used fo...
A Pilot Study in Order to Examine the Relationship between the Degree of Visual Impairment of Patient and His Postural Stability
The main aim of the pilot study was to evaluate the relationship between degree of visual impairment of patient and his postural stability. The article contains basic explanation and requirements for stabilography rese...
Investigation of Frictional Stick-Slick Effect in Disk Brake NVH
Paper describes the mechanism of vibration of a minimal automotive disc brake model which can lead to unwanted effects known as brake Noise Vibrations and Harshness (NVH). Stick-slip frictional effects are mathematical...
Effect of Minimum Quantity Lubrication on Surface Roughness and Temperature in Milling of EN31 Steel for Die Making
Minimum Quantity Lubrication has enormous influence on the process parameters in machining. The main aim of the present work is to study the effects of spindle speed, depth of cut, tool material, amount of coolant disp...