scholarly journals Electronic equipment measuring device for heat quantity through a flat wall

2020 ◽  
Vol 207 ◽  
pp. 01006
Author(s):  
Krastin Yordanov ◽  
Iliya Hadzhidimov ◽  
Penka Zlateva
Keyword(s):  
Experimental Study ◽  
Temperature Measurement ◽  
Electronic System ◽  
Outer Side ◽  
Measuring Device ◽  
Flat Wall ◽  
Minute Interval ◽  
South Wall ◽  
Heat Quantity ◽  
Quantity Measurement

In the paper, an experimental study for calculation the heat quantity through a flat wall by electronic system has been presented. The aim is temperature measurement on outer and inner walls of a room for 20 days at 1-minute interval of measurement. A transient regime has been considered. The data measured has been collected on a non-insulated south wall of a Technical University of Varna campus building. The wall layers parameters have to be known for the choice of surrounding area. In order to reduce errors of the outer side of wall temperature measurement caused by the solar radiation, the temperature sensor has been painted grey. The experimental equipment for the heat quantity measurement consists of two plates, each with 4 temperature fixed in a rectangle. The sensors are situated in а flat area in order to obtaining more precise results of experimental study. The problem has been solved by finding decision of the classic heat conduction equation. The experimental temperatures are treated by microprocessor’s platform based on Arduino board. As a result, the average temperature of each plate with sensors has been estimated.

scholarly journals Temperature Measurement at Curved Surfaces Using 3D Printed Planar Resistance Temperature Detectors

Electronics ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1100
Author(s):  
Adam Steckiewicz ◽  
Kornelia Konopka ◽  
Agnieszka Choroszucho ◽  
Jacek Maciej Stankiewicz
Keyword(s):  
Temperature Measurement ◽  
Fused Deposition Modeling ◽  
Numerical Models ◽  
Elastic Base ◽  
Measuring Device ◽  
Fused Deposition ◽  
Influence Of Temperature On ◽  
Printed Sensors ◽  
Analytical Formulae ◽  
3D Printed

In this article, novel 3D printed sensors for temperature measurement are presented. A planar structure of the resistive element is made, utilizing paths of a conductive filament embedded in an elastic base. Both electrically conductive and flexible filaments are used simultaneously during the 3D printing procedure, to form a ready–to–use measuring device. Due to the achieved flexibility, the detectors may be used on curved and irregular surfaces, with no concern for their possible damage. The geometry and properties of the proposed resistance detectors are discussed, along with a printing procedure. Numerical models of considered sensors are characterized, and the calculated current distributions as well as equivalent resistances of the different structures are compared. Then, a nonlinear influence of temperature on the resistance is experimentally determined for the exemplary planar sensors. Based on these results, using first–order and hybrid linear–exponential approximations, the analytical formulae are derived. Additionally, the device to measure an average temperature from several measuring surfaces is considered. Since geometry of the sensor can be designed utilizing presented approach and printed by applying fused deposition modeling, the functional device can be customized to individual needs.

A Study of the Efficiency of Plate Freezing vs. Blast Freezing of Boxed Boneless Meat in an Abattoir

Volume 1 ◽  
2004 ◽  
Author(s):  
Mir-Akbar Hessami
Keyword(s):  
Experimental Study ◽  
Temperature Measurement ◽  
Working Conditions ◽  
The Other ◽  
Freezing Time ◽  
Air Blast ◽  
Total Cost ◽  
Meat Packaging ◽  
Major Industry

Meat export is a major industry in Australia, and meat packaging and freezing is an energy intensive activity, requiring an objective technical investigation. This study was undertaken in order to assess the relative merits of plate and air blast freezing methods used in industry. To describe the efficiency and the technical superiority of one method over the other, in this paper, the details of an experimental study involving time-temperature measurement of meat boxes inside a plate freezer and a blast freezer under normal working conditions are provided. For the configurations used in this study, it is shown that the freezing time is much shorter for plate freezing, and also there is a much smaller variation in freezing time of various boxes compared to those for blast freezing. The smaller variation in freezing time of various boxes in each batch would help preserve the quality of meat being frozen. Also, it is explained that despite the initial higher capital cost of plate freezing, the total cost over the life of the equipment is much smaller for plate freezing compared to blast freezing.

scholarly journals Thermal Efficiency of a Solar Wall in Tunisia

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Narjes Dimassi ◽  
Leila Dehmani
Keyword(s):  
Experimental Study ◽  
Building Design ◽  
Mechanical Equipment ◽  
Heating Systems ◽  
South Wall ◽  
Trombe Wall ◽  
Passive Solar ◽  
Solar Wall ◽  
Local Weather ◽  
Moderate Climate

Passive solar heating systems are very attractive because of their exploitation of solar energy which is available and abundant. A passive solar system contributes with storage and direct gain to heat a building without the use of mechanical equipment. This investigation is a verification of the Trombe wall efficiency in Tunisia via an experimental study on a real building with a specificity of the local weather. The experimental study was carried on a south wall under real scale in the laboratory of thermal processes in the Center of Research and Technology of Energy (CRTEn) in Borj Cedria. During two different winter periods (January and April), the thermal performance of the wall was investigated using the collected data of velocity and temperature at different positions of the wall. The heat gain through the wall was calculated and the efficiency was found to decrease from January period (45%) to April period (31.7%). The results show that the Trombe wall ensures free heat in winter and can greatly increase the energy efficiency of a building. Thus, the Trombe wall integration to the building design offers many opportunities to take advantage of the Tunisian moderate climate.

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