scholarly journals Theoretical and experimental substantiation of the system of local removal of harmful substances during the combustion of candles in the worship hall of Orthodox churches and cathedrals

2021 ◽  
Vol 263 ◽  
pp. 04013
Author(s):  
Alexander Eremkin ◽  
Inna Ponomareva
Keyword(s):  
Thermal Imaging ◽  
Convective Flow ◽  
Ventilation System ◽  
Air Velocity ◽  
Efficient Operation ◽  
Local Exhaust Ventilation ◽  
Convective Flows ◽  
Exhaust Ventilation ◽  
Harmful Substances ◽  
Experimental Substantiation

The analysis of the features of Orthodox churches, temples and cathedrals, elements of the design of the halls of worship, and their preservation. The types of hazards generated during the burning of candles and the parishioners and staff present are systematized. Thermal imaging surveys of convective flows formed during candle combustion were carried out. A technique for conducting experiments and a diagram of an experimental setup for measuring the temperature and air velocity in a convective jet have been developed. The diagram of the convective flow structure is presented, which consists of individual jets from each candle. The results of the study have been obtained, which make it possible to determine the area of stable convective flow and the place of installation of the exhaust hood above the candlestick, as well as the distance between the burning candles and the edge of the bottom of the umbrella. A local mechanical exhaust ventilation system with umbrellas has been developed to trap and remove harmful substances from the worship hall and provide comfortable conditions for parishioners and preserve the decoration elements of the halls. The characteristics and conditions for the efficient operation of the hoods in the local exhaust ventilation system and the factors influencing their operation are given.

Performance of Different Front-Opening Unified Pod (FOUP) Moisture Removal Techniques With Local Exhaust Ventilation System

2020 ◽  
Vol 33 (2) ◽  
pp. 310-315 ◽  
Author(s):  
Tee Lin ◽  
Omid Ali Zargar ◽  
Oscar Juina ◽  
Tzu-Chieh Lee ◽  
Dexter Lyndon Sabusap ◽  
...  
Keyword(s):  
Ventilation System ◽  
Moisture Removal ◽  
Local Exhaust Ventilation ◽  
Exhaust Ventilation

Experimental and Simulation Validation Methods of Local Exhaust Ventilation (LEV) in Training Facilities Building

2013 ◽  
Vol 315 ◽  
pp. 997-1001 ◽  
Author(s):  
Ng Chee Seng ◽  
Abdul Mutalib Leman ◽  
Azmahani Sadikin
Keyword(s):  
Indoor Air ◽  
Ventilation System ◽  
Percentage Error ◽  
Local Exhaust Ventilation ◽  
Geometry Model ◽  
Exhaust Ventilation ◽  
Simulation Validation ◽  
Air Ventilation ◽  
Computational Fluid Dynamics Cfd ◽  
Real Flow

LEV is a ventilation system that collects and sucks out particles such as dusts, mists, gases, vapors or fumes out of work station, so that they can’t be breathed in by occupants. There is a lot of LEV allocated and installed in order to help protecting occupants’ health but it doesn’t work properly. To overcome this issue, computational fluid dynamics (CFD) will be implemented. Past studies CFD techniques represent a very significant improvement of air ventilation systems. However, CFD is just a tool in prediction model, which can lead to inaccuracy of predicting airflow due to problems with pre-processing, solver and post-processing with parameter from actual experimental results. As of yet, it is not possible to 100% accurately simulate airflow around a body. These codes are simply models which are close to that of a real flow, but not an exact match. All of these require validation to help minimizing percentage error in CFD methodology. Several strategies are needed to boost effectiveness of LEV in terms of predicting airflow in a geometry model. The outcome of this research can be used as a benchmark or guideline for industries to help improving indoor air quality (IAQ).

METHOD OF SELECTION AND CALCULATION DEVICES AIR CLEANING FROM CONDENSED AEROSOLS

2016 ◽  
Vol 6 (2) ◽  
pp. 14-18
Author(s):  
Denis N. VATUZOV ◽  
Svetlana M. PURING
Keyword(s):  
Energy Efficiency ◽  
Ventilation System ◽  
Design Parameters ◽  
Local Exhaust Ventilation ◽  
Improve Energy Efficiency ◽  
Air Cleaning ◽  
Exhaust Ventilation ◽  
Recovery System ◽  
Degree Of Purification ◽  
Ventilation Management

This article defines the options to improve the efficiency of local exhaust ventilation systems by incorporating into the circuit from the air cleaning devices droplet aerosol. Schemes connecting cleaning apparatus in ventilation management system are worked out. In the first embodiment, the placement aerozoleulovitelya purified ventilation air is discharged directly to the atmosphere, in the second embodiment, the cleaned air is used in the recovery system, which is removed after the street. The feasibility of using the heat exchanger in the scheme is justified by comparing the technical and economic options and the need to improve energy efficiency. The method of selection and calculation of air cleaning devices from droplet sprays, on the basis of which it is possible to determine the design parameters of the system, to evaluate the amount of captured material, and choose the most appropriate in each case unit, focusing on the desired performance of the ventilation system, the necessary degree of purification and the area for mounting the device.

OPTIMIZING THE CHOICE OF VENTILATING AIR CLEANING EQUIPMENT IN SYSTEMS OF LOCAL EXHAUST VENTILATION

2017 ◽  
Vol 7 (3) ◽  
pp. 19-23
Author(s):  
Svetlana M. PURING ◽  
Denis N. VATUZOV ◽  
Gennady I. TITOV
Keyword(s):  
Indoor Air ◽  
Desirability Function ◽  
Ventilation System ◽  
Aerodynamic Resistance ◽  
Multicriteria Analysis ◽  
Local Exhaust Ventilation ◽  
Air Cleaning ◽  
Exhaust Ventilation ◽  
Industrial Buildings ◽  
Cleaning Equipment

Functioning of industrial buildings is impossible without correctly organized ventilation system. Its work both regulates heat moist mode and the required indoor air purity that is cleaned with the help of air cleaning equipment. To make decision to construct the required air cleaning equipment at the enterprise it is worthwhile to give additional parameters and to solve a problem of multicriteria optimization to get the best results. The choice of the best variant is supposed to be carried out using Harrington’s desirability function. The conducted multicriteria analysis allowed to reveal optimum characteristics of air cleaning equipment, based on the required purifi cation air degree, the geometrical sizes of the equipment and aerodynamic resistance while introducing any particular device.

scholarly journals Influence of the scheme of air exchange organization in the room on the efficiency of the air-jet hood of the heat treatment chamber

2020 ◽  
Vol 224 ◽  
pp. 03026
Author(s):  
Tatyana Zhilkina ◽  
Viktor Pukhkal ◽  
Vladislav Pankov
Keyword(s):  
Heat Treatment ◽  
Software Package ◽  
Computational Experiment ◽  
Ventilation System ◽  
Exhaust Hood ◽  
Local Exhaust Ventilation ◽  
Exhaust Ventilation ◽  
Air Jet ◽  
Calculation Results ◽  
Air Exchange

Local exhaust ventilation allows maximizing the localization of hazards with minimum values of air exchange in the room. For the study, the design of a local exhaust in the form of an air-jet hood at an open doorway of the UKM Classic M 2005 chamber by Mauting was adopted. Geometric models have been developed, including a heat treatment chamber, a room from which the chamber is loaded, a supply and exhaust hood over the door from the chamber to the room, and a supply air duct with air distributing devices. The results of a computational experiment on modeling the operation of the local exhaust ventilation system of the heat treatment chamber are presented. The STAR-CCM+ software package was used as a calculation program. The calculation results were analyzed. The influence of the air exchange scheme (location of the supply devices) in the room on the efficiency of the local exhaust devices (supply and exhaust hood) has been established.

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