scholarly journals NATURAL WIND DRIVEN SUSTAINABLE VENTILATION SYSTEM (PROTOTYPE) FOR INDOOR LIVING SPACES

2021 ◽  
Vol 170 (0) ◽  
pp. 184-201
Author(s):  
El-Darwish I. I. ◽  
Rizk A. A.
Keyword(s):  
Ventilation System ◽  
System Prototype ◽  
Natural Wind

Study on Gas Percolation Motion Law in Coalfield Outcrop Fire

2014 ◽  
Vol 675-677 ◽  
pp. 1440-1445
Author(s):  
Wen Cai Wang ◽  
Jun Sen Lin ◽  
Jun Duan ◽  
Wen Bin Wei ◽  
Shao Xiang Chen ◽  
...  
Keyword(s):  
Coal Combustion ◽  
Natural Ventilation ◽  
Spontaneous Combustion ◽  
Ventilation System ◽  
Wind Pressure ◽  
Darcy Law ◽  
Coal Spontaneous Combustion ◽  
Combustion Gases ◽  
Air Intake ◽  
Natural Wind

By analysis the form of gas percolation in coalfield fire, the follow conclusion is obtained : under the influence of natural wind pressure and fire pressure, natural ventilation system of coalfield outcrop is formed automatically during coal spontaneous combustion, which exists in two forms, one is the fresh airflow percolation in caving zone and its pore, the other is coal combustion gases migration movements in cracks after sliding. The fluent numerical simulations show that natural ventilation system in coalfield outcrop fire district is a vacuum ventilation system; From inlet to combustion area air intake line, air pressure and gas percolation on linear relationship, and gas percolation meets Darcy law in the porous medium percolation theory.

NUMERICAL SIMULATION OF VENTILATION SYSTEM WITHIN AN ARMORED VEHICLE CABIN

2007 ◽  
Vol 14 (2) ◽  
pp. 201-223
Author(s):  
Chin-Lung Chang ◽  
Chang-Hsien Tai ◽  
Chien-Hsiung Tsai ◽  
Yu-Ren Wang ◽  
Qing-Shan Hon
Keyword(s):  
Numerical Simulation ◽  
Ventilation System ◽  
Vehicle Cabin ◽  
Armored Vehicle

Numerical and Experimental Modeling of Indoor Air Quality Inside a Conditioned Space with Mechanical Ventilation and DX-Air Conditioner

2020 ◽  
Vol 38 (9A) ◽  
pp. 1257-1275
Author(s):  
Wisam M. Mareed ◽  
Hasanen M. Hussen
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Ventilation System ◽  
Thermal Conditions ◽  
Airflow Rate ◽  
Air Conditioner ◽  
Breathing Zone ◽  
Lecture Room ◽  
Ventilation Performance

 Elevated CO2 rates in a building affect the health of the occupant. This paper deals with an experimental and numerical analysis conducted in a full-scale test room located in the Department of Mechanical Engineering at the University of Technology. The experiments and CFD were conducted for analyzing ventilation performance. It is a study on the effect of the discharge airflow rate of the ceiling type air-conditioner on ventilation performance in the lecture room with the mixing ventilation. Most obtained findings show that database and questionnaires analyzed prefer heights between 0.2 m to 1.2 m in the middle of an occupied zone and breathing zone height of between 0.75 m to 1.8 given in the literature surveyed. It is noticed the mismatch of internal conditions with thermal comfort, and indoor air quality recommended by [ASHRAE Standard 62, ANSI / ASHRAE Standard 55-2010]. CFD simulations have been carried to provide insights on the indoor air quality and comfort conditions throughout the classroom. Particle concentrations, thermal conditions, and modified ventilation system solutions are reported.

Evaluation of respiratory exposure to 4,4-methylene diphenyl diisocyanate (MDI) vapors in foam injection workers in a household appliance manufacturing company: An Occupational Carcinogen

2019 ◽  
Vol 2 (1) ◽  
pp. 23-27
Author(s):  
Ahmad Nikpey ◽  
Hamzeh Saeidabadi ◽  
Salman Sheikhi ◽  
Saeed Yari ◽  
Tayyebeh Jaddi Madarsara
Keyword(s):  
Ventilation System ◽  
The Body ◽  
Foam Material ◽  
Respiratory Capacity ◽  
Household Appliance ◽  
Administrative Personnel ◽  
Respiratory Exposure ◽  
Methylene Diphenyl Diisocyanate ◽  
Manufacturing Company ◽  
Spss Software

Background: Appliance manufacturing boom is very high hand customers always have a great deal of attention to products that have low energy consumption, therefore the use of isocyanates MDI as a thermal insulation in the body of the refrigerator and is also widely used as a binder in the production of washing machines.  MDI isocyanate study the effects on the respiratory capacity of formers injection was done foam material in a household appliance company Method: this case control study in 1395 and a household appliance manufacturing company in the province of Qazvin 20 personnel working injected foam material is exposed to isocyanates ,for example administrative personnel and 20 served as controls using medical records these values breathing capacity  FVC , FEV1 , FEV1/FVC in  both 1390 and 1394 extracted using SPSS software and paired T-TEST data were analyzed. Results: Measuring the concentration of isocyanate in 90 blocks in the cabin and tap lid above the limit, which was due to the failure of the ventilation system, in 94 years due to the good performance of the ventilation system in the isocyanate concentration was at the limit. According to their experiences foam material is injected every three indexes FVC, FEV1, FEV1/FVC had significant losses, FEV1 and FVC decline among which were a significant level. (p=0.036, p= 0.008) the control samples also non- significant decline in the indicators that this can be attributed to aging. Conclusion: It is known that exposure to isocyanate materials decreased respiratory capacity is personnel, to postpone it to the desired function ventilation system. it would be desirable to postpone the operation of the ventilation system and non-isocyanate leak on the ground, work, be a lot of attention. even with the improvement of the job must be conservative’s injection foam material is exposed to isocyanates be included in the list of hard and hazardous jobs.   Keywords: MDI, respiratory exposure, respiratory capacity, workers inject foam material.

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