Experimental Study of Tubular Light Pipe System: Influence of Light Reflector on Its Performance

2018 ◽  
pp. 21-30 ◽  
Author(s):  
Abdus Salam Azad ◽  
Dibakar Rakshit
Keyword(s):  
Experimental Study ◽  
Pipe System ◽  
Light Pipe

Sector Rotating Heat Pipe With Interconnected Branches and Reservoir for Turbomachinery Cooling

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Brian Reding ◽  
Yiding Cao
Keyword(s):  
Experimental Study ◽  
Heat Pipe ◽  
Heat Pipes ◽  
High Heat ◽  
Heat Fluxes ◽  
Practical Solution ◽  
Pipe System ◽  
Current Configuration ◽  
Cooling Technique

Heat pipe technology offers a possible cooling technique for structures exposed to high heat fluxes, as in turbomachinery such as compressors and turbines. However, in its current configuration as single heat pipes, implementation of the technology is limited due to the difficulties in manufacturability and costs. Hence, a study to develop a new radially rotating (RR) heat pipe system was undertaken, which integrates multiple RR heat pipes with a common reservoir and interconnected braches for a more effective and practical solution to turbomachinery cooling. Experimental study has shown that the integration of multiple heat pipe branches with a reservoir at the top is feasible.

EXPERIMENTAL STUDY ON HYDRAULIC PROPERTIES OF MANHOLES IN A SURCHARGED SEWER PIPE SYSTEM

2020 ◽  
Vol 76 (2) ◽  
pp. I_451-I_460
Author(s):  
Hao ZHANG ◽  
Kenji KAWAIKE ◽  
Shoji OKADA ◽  
Taku FUJIWARA
Keyword(s):  
Experimental Study ◽  
Hydraulic Properties ◽  
Sewer Pipe ◽  
Pipe System

An Experimental Study on the Influence of Structural Damping on Internal Fluid Pressure During a Transient Flow

1990 ◽  
Vol 112 (3) ◽  
pp. 284-290 ◽  
Author(s):  
D. D. Budny ◽  
F. J. Hatfield ◽  
D. C. Wiggert
Keyword(s):  
Experimental Study ◽  
Transient Flow ◽  
Traditional Approach ◽  
Dynamic Pressure ◽  
Fluid Pressure ◽  
Piping System ◽  
Internal Dynamic ◽  
Structural Damping ◽  
Pipe System ◽  
Internal Fluid

The traditional approach to designing a piping system subject to internal dynamic pressure is to restrain the piping as much as possible, and the approximation made in the analysis is to assume no contribution of structural energy dissipation. To determine the validity of this concept and approximation, an experimental study of a piping system was performed to measure the influence of structural damping. A pipe system was designed with a loop that could be turned so that its natural frequency would match that of the contained liquid. It was discovered that a properly sized damper on the piping loop greatly accelerates the decay of the fluid pressure transient. The damper absorbs some energy from the piping, reducing the resulting rebound fluid pressure. When the loop is subjected to forced steady-state vibration, there is a fluid pressure response. The amplitude of that pressure can be reduced by installing an external damper: the stiffer the damper the more effective it is in reducing dynamic pressure.

Experimental Study on Performance of Top Lighting Solar Light Pipes in the Meeting Room in Winter in Beijing

2012 ◽  
Vol 178-181 ◽  
pp. 29-32 ◽  
Author(s):  
Yan Peng Wu ◽  
Hong Li
Keyword(s):  
Experimental Study ◽  
Energy Consumption ◽  
Daily Life ◽  
Solar Light ◽  
Design Criteria ◽  
Artificial Light ◽  
Light Sources ◽  
Experimental Time ◽  
Light Pipe ◽  
Meeting Room

The lighting performance of top lighting solar light pipe in the meeting room in winter in Beijing has been measured under sunny and cloudy conditions to analyze whether the top solar light pipe can satisfy the general jobs lighting or not. The results showed that the indoor maximum and minimum illuminance were 163.2 lux and 115.4 lux respectively and the average illuminance was 147.8 lux in one day. The simulated average illuminance is 113lx in the same experimental time. It can satisfy the design criteria requirements and generally meet the basic for the meeting rooms. The light pipe can be the accessorial illuminance equipment to substitute partial or total artificial light sources in daily life to decrease the energy consumption of lighting.

An experimental study of a facade mounted light pipe

2009 ◽  
Vol 41 (2) ◽  
pp. 123-142 ◽  
Author(s):  
V. Duc Hien ◽  
S. Chirarattananon
Keyword(s):  
Experimental Study ◽  
Light Pipe

Hyperbaric Chamber Lighting

1974 ◽  
Vol 96 (1) ◽  
pp. 281-284 ◽  
Author(s):  
J. M. Canty
Keyword(s):  
Light Source ◽  
Vessel Wall ◽  
Hyperbaric Chamber ◽  
Small Opening ◽  
Pipe System ◽  
Light Pipe ◽  
Electrical Systems

Internal electrical systems have been the cause of some very serious accidents in hyperbaric chambers. This paper describes a new “light pipe” system which can be installed in a very small opening in the vessel wall. Most of the IR energy is intercepted before the light enters the chamber resulting in a cool light source, simple to install and maintain. A description of the system is presented along with performance for several light pipe configurations.

Monitoring of a small top lighting solar light pipe system

2009 ◽  
Author(s):  
Yanpeng Wu ◽  
Zhiyou Yue ◽  
Rendong Jin ◽  
Li Liu
Keyword(s):  
Solar Light ◽  
Pipe System ◽  
Light Pipe

Energy saving potential of tubular light pipe system with different colors on internal surfaces

2019 ◽  
Vol 14 (4) ◽  
pp. 793-837
Author(s):  
Abdus Salam Azad ◽  
Mohd Salman ◽  
S.C. Kaushik ◽  
Dibakar Rakshit
Keyword(s):  
Prediction Models ◽  
Residential Buildings ◽  
Mean Bias Error ◽  
Bias Error ◽  
New Delhi ◽  
Content Type ◽  
Pipe System ◽  
Solar Altitude ◽  
Light Pipe ◽  
Different Seasons

Purpose Lighting in building sectors (consumes the highest energy in commercial buildings and the second highest in residential buildings in India) has very much potential for energy conservation in buildings. With the use of daylighting system, energy consumption in lighting can be lowered up to 30 to 40 per cent. Design/methodology/approach An experimental effort has been made in this paper to explore the internal wall coloring effect on the performance of tubular light pipe. Trace-pro software has been used and validated. With the help of this software, light pipe has been designed and simulated in a ray tracing mode. Assessment of four globally used prediction models has also been conducted to compare the performances in different seasons for light pipes in the composite climate of New Delhi. Findings It has been conducted based on three statistical indicators as mean bias error, root mean square error and R2. Using regression, an empirical model for average internal illuminance has been developed as a function of light reflectance value (LRV) and solar altitude angle. Trace-pro results confirmed that maximum internal illuminance can be obtained with wall surfaces coated with high LRV color. Finally, by using of a single light pipe system for a test room with the artificial lighting system and applying continuous dimming control, the amount of electrical energy has been saved up to 38.5 per cent per year. Originality/value After going through the literature, it has been identified that there has been no paper published which explores the effect of colors of the internal walls on the performance of the light pipe. Along with this, the comparison between existing empirical performance models and find out which model gives the best result in different seasons has been carried out for New Delhi, India.

An innovative vehicle headlamp design based on a high-efficiency LED light pipe system

2013 ◽  
Vol 47 (2) ◽  
pp. 210-220 ◽  
Author(s):  
AJW Whang ◽  
KC Jhan ◽  
SM Chao ◽  
GW Chen ◽  
CH Chou ◽  
...  
Keyword(s):  
High Efficiency ◽  
Led Light ◽  
Pipe System ◽  
Light Pipe
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