The Effect of Air Change Rate and Cleanroom Garment on Cleanliness in Grade B Cleanroom

2013 ◽  
Vol 441 ◽  
pp. 514-517
Author(s):  
Hao Li ◽  
Zhi Jun Zou ◽  
Fei Wang
Keyword(s):  
Numerical Simulation ◽  
Human Body ◽  
Operating Cost ◽  
Change Rate ◽  
Air Change Rate

The air change rate and cleanroom garment have a great impact on cleanliness and operating cost of cleanroom. This paper use the method of numerical simulation to research the effect on cleanliness with different air change rate and cleanroom garment in Grade B cleanroom. The results show the air change rate of 20/h will meet the requirements of the specification and the garment cover whole human body will decrease the particles emitted from human body mostly.

Numerical Simulation on Mechanical Ventilation for Odor Removal Efficiency in a Bathroom

2011 ◽  
Vol 243-249 ◽  
pp. 4877-4882
Author(s):  
Yiin Kuen Fuh ◽  
Wei Chi Huang
Keyword(s):  
Numerical Simulation ◽  
Mechanical Ventilation ◽  
Removal Efficiency ◽  
Previous Experiment ◽  
Change Rate ◽  
Air Change Rate ◽  
Odor Removal ◽  
Simulation Results ◽  
Ventilation Rates ◽  
Air Vent

This paper numerically studies the effect of ventilation rates and bathroom equipment locations on the odor removal efficiency in a modeled bathroom. Simulation results agree well with previously published experiments such that moving exhaust air vent from ceiling to wall and addition of one supply fan would significantly improve odor removal efficiency. In addition, by doubling the area of exhaust vent under a fixed air change rate, odor removal efficiency (ORE) can be greatly enhanced to 16-30% while previous experiment showed only a moderate 4% increase in ORE when doubled the flow rate of supply air.

scholarly journals Comparison of Downdraught and Up Draft Passive Air Conduction Systems (PACS) in a Winery Building

Buildings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 259
Author(s):  
Ádám László Katona ◽  
István Ervin Háber ◽  
István Kistelegdi
Keyword(s):  
Air Conditioning ◽  
Natural Ventilation ◽  
Dynamics Simulation ◽  
Computational Fluid Dynamics Simulation ◽  
General Applicability ◽  
Change Rate ◽  
Air Change Rate ◽  
Simulation Based ◽  
Ventilation Performance ◽  
Air Conduction

A huge portion of energy consumption in buildings comes from heating, ventilation, and air conditioning. Numerous previous works assessed the potential of natural ventilation compared to mechanical ventilation and proved their justification on the field. Nevertheless, it is a major difficulty to collect enough information from the literature to make decisions between different natural ventilation solutions with a given situation and boundary conditions. The current study tests the passive air conduction system (PACS) variations in the design phase of a medium-sized new winery’s cellar and production hall in Villány, Hungary. A computational fluid dynamics simulation based comparative analysis enabled to determine the differences in updraft (UD) and downdraught (DD) PACS, whereby the latter was found to be more efficient. While the DD PACS performed an air change range of 1.02 h−1 to 5.98 h−1, the UD PACS delivered −0.25 h−1 to 12.82 h−1 air change rate. The ventilation performance of the DD version possessed lower amplitudes, but the distribution was more balanced under different wind incident angles, thus this version was chosen for construction. It could be concluded that the DD PACS provides a more general applicability for natural ventilation in moderate climates and in small to medium scale industry hall domains with one in- and one outlet.

A New Method to Concentrate Electromagnetic Field Within ROI Using a High Dielectric Material in 3T Body MRI

2013 ◽  
Author(s):  
Bu S. Park ◽  
Sunder S. Rajan ◽  
Leonardo M. Angelone
Keyword(s):  
Numerical Simulation ◽  
Electromagnetic Field ◽  
Human Body ◽  
Region Of Interest ◽  
Dielectric Materials ◽  
The Body ◽  
Human Body Model ◽  
Body Model ◽  
Simulation Results ◽  
High Dielectric

We present numerical simulation results showing that high dielectric materials (HDMs) when placed between the human body model and the body coil significantly alter the electromagnetic field inside the body. The numerical simulation results show that the electromagnetic field (E, B, and SAR) within a region of interest (ROI) is concentrated (increased). In addition, the average electromagnetic fields decreased significantly outside the region of interest. The calculation results using a human body model and HDM of Barium Strontium Titanate (BST) show that the mean local SAR was decreased by about 56% (i.e., 18.7 vs. 8.2 W/kg) within the body model.

scholarly journals Estimation of a room ventilation air change rate using a stochastic grey-box modelling approach

Measurement ◽  
2018 ◽  
Vol 124 ◽  
pp. 539-548 ◽  
Author(s):  
Marcel Macarulla ◽  
Miquel Casals ◽  
Núria Forcada ◽  
Marta Gangolells ◽  
Alberto Giretti
Keyword(s):  
Change Rate ◽  
Room Ventilation ◽  
Air Change Rate ◽  
Modelling Approach
Sign in / Sign up

Export Citation Format

Share Document