The Analysis of the Effects of Critical Velocity in Tunnel Fires with Water Spray System

2019 ◽  
pp. 925-937
Author(s):  
Guan-Yuan Wu ◽  
Shang-Chin Hsu
Keyword(s):  
Critical Velocity ◽  
Water Spray ◽  
Tunnel Fires ◽  
Spray System

scholarly journals Flow fields induced by longitudinal ventilation and water spray system in reduced-scale tunnel fires

2020 ◽  
Vol 104 ◽  
pp. 103543
Author(s):  
Jiayun Sun ◽  
Zhi Tang ◽  
Zheng Fang ◽  
Tarek Beji ◽  
Bart Merci
Keyword(s):  
Flow Fields ◽  
Water Spray ◽  
Tunnel Fires ◽  
Longitudinal Ventilation ◽  
Spray System ◽  
Reduced Scale

scholarly journals Experimental investigations of spray flow rate and angle in enhancing the performance of PV panels by steady and pulsating water spray system

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Mojtaba Nateqi ◽  
Mehran Rajabi Zargarabadi ◽  
Roohollah Rafee
Keyword(s):  
Cooling System ◽  
Spray Cooling ◽  
Spray Angle ◽  
Experimental Investigations ◽  
Water Spray ◽  
Maximum Increase ◽  
Photovoltaic Panel ◽  
Electrical Efficiency ◽  
Spray System ◽  
Pv Panel

AbstractIn this study, a spray cooling system is experimentally investigated to increase the photovoltaic panel efficiency. Cooling of photovoltaic panels is one of the important parameters that affects the PV panel performance. In this experiment the effects of spray angle, nozzles to PV panel distance, number of nozzles, and pulsating water spray on the PV panel performance are investigated. For this purpose, an experimental setup was made. The spray angles varied from 15° to 50°. The comparison between the spray angles shows that by decreasing the spray angle to 15° increases the electrical efficiency of PV panel to 19.78% and simultaneously the average PV panel temperature decreases from 64 (for non-cooled PV) to 24 °C. Also, nozzle to PV panel distance was changed from 10 to 50 cm. The best result was obtained for the lowest distance by 25.86% increase in power output. Study of various frequency also show that due to the surface evaporation and the intensity of the radiation, increasing the water spraying frequency can increase or decrease the electrical efficiency. The On–Off water spray system results show that the maximum increase in efficiency was obtained with frequency of 0.2 Hz which it was 16.84%. Water consumption also decreased to half.

Explosion Simulation for Petrochemical Plant with Water Spray

2013 ◽  
Vol 634-638 ◽  
pp. 1608-1611
Author(s):  
Ji Wu Yuan ◽  
Xiang Di Zhao ◽  
Zheng Wang
Keyword(s):  
Coal Gasification ◽  
Petrochemical Plant ◽  
Water Spray ◽  
Design And Optimization ◽  
Traditional Assessment ◽  
Spray System ◽  
System A ◽  
Assessment Techniques ◽  
Plant Simulation ◽  
Explosion Risk

Traditional assessment techniques can't predict the explosion with effects of water spray system. A method of explosion simulation which based on FLACS software for Petrochemical plant with water spray were used for simulating the explosion risk of a coal gasification company’s plant. Simulation results indicate that the water spray system can significantly weaken the devices exploded consequences. This method can be used for fire protection system design and optimization of layout for petrochemical plants.

Smoke Control in Subway Tunnel Fires

2014 ◽  
Vol 638-640 ◽  
pp. 2027-2030
Author(s):  
Xiao Xiong Zha ◽  
Sheng Zeng ◽  
Yi Yan Chen ◽  
Rui Juan Jiang
Keyword(s):  
Computer Simulation ◽  
Theoretical Analysis ◽  
Critical Velocity ◽  
Simple Formula ◽  
Control Mode ◽  
Subway Tunnel ◽  
Smoke Control ◽  
Release Rates ◽  
Tunnel Fires ◽  
Ventilation Velocity

This paper concerns the smoke control modes and the critical ventilation velocity when the subway tunnel on fires. The standard for the smoke control mode is making sure the smoke exhausting in the shortest way. The critical ventilation velocity means it is just sufficient to prevent the smoke spreading upstream. The critical velocity in different heat release rates obtained though theoretical analysis and computer simulation. In the end, a simple formula to calculate the critical velocity can be fitting out.

Development and Evaluation of an Onboard Aircraft Cabin Water Spray System for Postcrash Fire Protection

1991 ◽  
Author(s):  
Richard G. Hill ◽  
Constantine P. Sarkos ◽  
Timothy R. Marker
Keyword(s):  
Fire Protection ◽  
Water Spray ◽  
Aircraft Cabin ◽  
Spray System
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