scholarly journals On a linear fire detection using coaxial cables

2014 ◽  
Vol 18 (2) ◽  
pp. 603-614 ◽  
Author(s):  
Radoje Jevtic ◽  
Milan Blagojevic
Keyword(s):  
Fire Detection ◽  
Working Environment ◽  
Alarm Systems ◽  
Modern Engineering ◽  
Nikola Tesla ◽  
Different Types ◽  
Dynamic Simulator ◽  
Fire Detector ◽  
Fire Dynamic Simulator ◽  
Made In

Alarm systems represent a combination of the various modern engineering solutions (electrical, mechanical, hydraulic, etc.) with the primary goal to protect human lives, living and working environment and material properties. Detectors are basic and common components of these systems. There are many different kinds of detectors which usage depends on system solutions, prices and other technical properties of system application. Different types of non-typical lines can be used as detectors in alarm systems, such as coaxial cables or special constructed electrical lines. The change of some parameters of cables, such as capacity, impedance, resistance or similar, according to temperature, pressure, torsion or other disturbances, can be used for detection of intruder or fire. This work presents experimental results obtained on three different types of coaxial cables: RF 75-3-1, RF 75-4-5 and RF 75-7-9 in order to show changes of capacity as a consequence of heating due to growth of surrounding temperature, and consequently, possible application of cables as fire detector. Before an experiment, a simulation of fire in laboratory 113 in Electrotechnical school Nikola Tesla in Nis was made in FDS (Fire dynamic simulator) software to show the possible spreading of fire, and consequently, to find optimal location for coaxial cables as fire detectors.

CFD modeling of Dalmarnock uncontrolled fire test

2012 ◽  
Vol 2 (2) ◽  
Author(s):  
Sergey Mijorski ◽  
Peter Stankov
Keyword(s):  
Wind Velocity ◽  
Fire Test ◽  
Temperature Fields ◽  
Cfd Modeling ◽  
Model Parameters ◽  
Fire Experiment ◽  
Dynamic Simulator ◽  
Fire Dynamic Simulator ◽  
Velocity Changes ◽  
Made In

AbstractThe study describes a CFD based modeling of a fire in multi-storey apartments building. The model parameters are taken from a fire experiment with uncontrolled ventilation conditions. The aim of the current work is to describe some features and difficulties of fire CFD modeling in close compartments. The instrument used for CFD modeling was Fire Dynamic Simulator. The analysis is made in terms of fire development in an apartment and influence of wind velocity changes on temperature fields

scholarly journals Smart Fire Detector utilizing IoT-based Zigbee Sensor

2022 ◽  
Vol 21 (2) ◽  
pp. 1132
Author(s):  
Jung kyu Park
Keyword(s):  
Detection System ◽  
Fire Detection ◽  
Raspberry Pi ◽  
Control Panel ◽  
Alarm System ◽  
Fire Alarm ◽  
Alarm Systems ◽  
Fire Alarm System ◽  
Fire Detector ◽  
Conventional Systems

<pre>There are several differences between the two types of alarm systems, conventional systems and addressable systems. It is important to carefully determine the introduction of a fire alarm system according to the installation environment. Talking about the main difference relates to how the connected device communicates with the main control panel by sending a signal. Cost is another factor that can be a determinant of your chosen fire alarm system. In this paper, we proposed smart addressable fire detection system. In the proposed system, <span>IoT</span> was used and the network was constructed using <span>ZigBee</span> module. In the configured network, it consists of a local server and a control server. The local server controls the addressing sensor and sends the information obtained from the sensor to the control server. The control server receives data transmitted from the local server and enables quick fire action. In the actual implementation, the local server used the Lycra controller and <span>ZigBee</span> module. In addition, the control server used the Raspberry Pi and <span>ZigBee</span> modules and connected to the Ethernet so that the administrator could monitor or control the local server.</pre>

Noise properties of thin-film Ni-P resistors embedded in printed circuit boards

2013 ◽  
Vol 61 (3) ◽  
pp. 731-735
Author(s):  
A.W. Stadler ◽  
Z. Zawiślak ◽  
W. Stęplewski ◽  
A. Dziedzic
Keyword(s):  
Thin Film ◽  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Noise Component ◽  
Printed Circuit ◽  
Resistance Bridge ◽  
Different Types ◽  
Signal Path ◽  
Resistance Fluctuations ◽  
Made In

Abstract. Noise studies of planar thin-film Ni-P resistors made in/on Printed Circuit Boards, both covered with two different types of cladding or uncladded have been described. The resistors have been made of the resistive-conductive-material (Ohmega-Ply©) of 100 Ώ/sq. Noise of the selected pairs of samples has been measured in the DC resistance bridge with a transformer as the first stage in a signal path. 1/f noise caused by resistance fluctuations has been found to be the main noise component. Parameters describing noise properties of the resistors have been calculated and then compared with the parameters of other previously studied thin- and thick-film resistive materials.

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