Thermal effect of temperature gradient in a field environment chamber served by displacement ventilation system in the tropics

2007 ◽  
Vol 42 (1) ◽  
pp. 516-524 ◽  
Author(s):  
W.J. Yu ◽  
K.W.D. Cheong ◽  
K.W. Tham ◽  
S.C. Sekhar ◽  
R. Kosonen
Keyword(s):  
Temperature Gradient ◽  
Thermal Effect ◽  
Ventilation System ◽  
Effect Of Temperature ◽  
Displacement Ventilation ◽  
Field Environment ◽  
Environment Chamber ◽  
The Tropics

Local Discomfort Caused by Draft Perception in a Space Served by Displacement Ventilation System in the Tropics

2006 ◽  
Vol 15 (3) ◽  
pp. 225-233 ◽  
Author(s):  
W. J. Yu ◽  
K. W. D. Cheong ◽  
S. C. Sekhar ◽  
K. W. Tham ◽  
R. Kosonen
Keyword(s):  
Ventilation System ◽  
Displacement Ventilation ◽  
The Tropics

scholarly journals Effect of temperature on non-linear dynamical property of stuffer box crimping and bubble electrospinning

2014 ◽  
Vol 18 (3) ◽  
pp. 1049-1053 ◽  
Author(s):  
Jian-Xin Huang ◽  
Min-Feng Song ◽  
Hai-Yan Kong ◽  
Ping Wang ◽  
Ji-Huan He
Keyword(s):  
High Temperature ◽  
Temperature Gradient ◽  
Thermal Effect ◽  
Transverse Vibration ◽  
Mass Production ◽  
Axial Load ◽  
Dynamical Property ◽  
Effect Of Temperature ◽  
Production Ratio ◽  
Axially Moving

The velocity of axially moving slender fiber of viscoelastic fluid is an important factor in mass-production of crimped fibers in stuffer box crimping and bubble electrospinning. A governing equation for fiber crimp is obtained by the Hamilton?s principle, and the natural frequency and critical axially moving velocity are obtained analytically by considering the thermal effect. It is concluded that a high temperature gradient can greatly enhance the production ratio and guarantee the fundamental transverse vibration. Additionally the effects of the tensile axial load and amplitude on transverse vibration are also elucidated.

Fume transports in a high rise industrial welding hall with displacement ventilation system and individual ventilation units

2012 ◽  
Vol 52 ◽  
pp. 119-128 ◽  
Author(s):  
Han-Qing Wang ◽  
Chun-Hua Huang ◽  
Di Liu ◽  
Fu-Yun Zhao ◽  
Hai-Bo Sun ◽  
...  
Keyword(s):  
Ventilation System ◽  
Displacement Ventilation ◽  
High Rise

scholarly journals The Effect of Cooling Agent on Stress and Deformation of Charge-loaded Cast Pallets

2017 ◽  
Vol 17 (4) ◽  
pp. 13-18
Author(s):  
A. Bajwoluk ◽  
P. Gutowski
Keyword(s):  
Heat Transfer ◽  
Heat Treatment ◽  
Temperature Gradient ◽  
Effect Of Temperature ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Cooling Conditions ◽  
Cooling Agent ◽  
Stress And Deformation ◽  
A Charge

Abstract The results of research on the effect of the type of cooling agent used during heat treatment and thermal-chemical treatment on the formation of temperature gradient and stress-deformation distribution in cast pallets, which are part of furnace accessories used in this treatment, are disclosed. During operation, pallets are exposed to the effect of the same conditions as the charge they are carrying. Cyclic thermal loads are the main cause of excessive deformations or cracks, which after some time of the cast pallet operation result in its withdrawal due to damage. One of the major causes of this damage are stresses formed under the effect of temperature gradient in the unevenly cooled pallet construction. Studies focused on the analysis of heat flow in a charge-loaded pallet, cooled by various cooling agents characterized by different heat transfer coefficients and temperature. Based on the obtained temperature distribution, the stress distribution and the resulting deformation were examined. The results enabled drawing relevant conclusions about the effect of cooling conditions on stresses formed in the direction of the largest temperature gradient.

Computational Modeling of Particulate Pollutant Transport in a Ventilated Room in the Presence of Two Heated Breathing and Rotating Manikins

2017 ◽  
Author(s):  
Seyed Ali Keshavarz ◽  
Mazyar Salmanzadeh ◽  
Goodarz Ahmadi
Keyword(s):  
Air Quality ◽  
Computational Modeling ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Rotational Motion ◽  
Indoor Environment ◽  
Ventilation System ◽  
Thermal Plume ◽  
Displacement Ventilation ◽  
Simulation Results

Recently, attention has been given to indoor air quality due to its serious health concerns. Clearly the dispersion of pollutant is directly affected by the airflow patterns. The airflow in indoor environment is the results of a combination of several factors. In the present study, the effects of thermal plume and respiration on the indoor air quality in a ventilated cubicle were investigated using an unsteady computational modeling approach. The person-to-person contaminant transports in a ventilated room with mixing and displacement ventilation systems were studied. The effects of rotational motion of the heated manikins were also analyzed. Simulation results showed that in the cases which rotational motion was included, the human thermal plume and associated particle transport were significantly distorted. The distortion was more noticeable for the displacement ventilation system. Also it was found that the displacement ventilation system lowered the risk of person-to-person transmission in an office space in comparison with the mixing ventilation system. On the other hand the mixing system was shown to be more effective compared to the displacement ventilation in removing the particles and pollutant that entered the room through the inlet air diffuser.

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