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Lin Lv|Design requirements and application of ventilation parameters in occupational health assessment

Date:2017-08-02Author:
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吕琳W.jpg


  

Lin Lv

Professor

Vice Director of Institute of Health Assessment on Construction Projects

Beijing Center for Disease Control and Prevention


She worked in Beijing Municipal Institute of Labour Protection from 1986 to 1997, engaging in the scientific research and design on air pollution control, and since 1998, she has been working in Beijing Center for Disease Control and Prevention and engaging in the assessment of occupational hazards. She has presided over or participated in several research projects, and won three 3rd class prizes of the provincial and ministerial science and technology progress awards. She has also participated in the drafting of 8 national and industrial standards, published 10 monographs and more than 40 papers.

She is also the standing committee member of Occupational Health Specialized Committee in China Occupational Safety and Health Association, the standing committee member of Health Engineering Branch in Chinese Preventive Medicine Association, the expert of occupational health expert database of State Administration of Work Safety (SAWS), the member of the 5th national work safety experts database of SAWS, and the standing committee member of Editorial Board of Chinese Journal of Public Health Engineering.


Topic of Lecture: Design requirements and application of ventilation parameters in occupational health assessment


Abstract: In the occupational health assessment on construction projects, the evaluation of protective measures of health engineering involves the design parameters such as fresh air rate, general ventilation rate and emergency ventilation. The application varies with different scopes and meanings. This paper discusses the regulation and application scope of fresh air rate, air changes, emergency ventilation and air distribution. 

The fresh air rate is usually assessed according to the Hygienic Standards for Design of Industrial Enterprises, Design Code for Heating Ventilation and Air Conditioning of Industrial Buildings, Code for Design of Clean Workshops. It is usually evaluated with the air changes per hour when the ventilation volume is hard to determine. The design manuals and some industry design specifications define some requirements for ventilation in some workplaces. An emergency ventilation device shall be installed in the indoor workplaces where a large amount of hazardous substances, poisoning or inflammable and explosive chemicals may be suddenly produced. The emergency ventilation rate should be determined by calculation according to the design requirements, but it should not be less than 12 times/h. The required rates of emergency ventilation are different from industry to industry. Air distribution is also important, the distribution of general ventilation rate should focus on the convective diffusion, and the specific situation needs to be considered. When removing dust from a portable small dust removal device, it should be noted whether the exhaust outlet of this device is in indoor discharge.

For the workshop or closed shop with central air conditioning system, the fresh air rate is an indispensable evaluation index, which cannot be replaced by the general ventilation and air changes. 

The minimum fresh air rate of sanitation requirements is estimated by the amount of carbon dioxide emitted by people, mainly to meet the needs of indoor breathing. Therefore, even if there are no harmful substances in the workshop, the fresh air rate should be ensured. The general ventilation and air changes emphasize the exclusion of harmful substances, residual heat and moisture. Those parameters should be specified accordingly in every evaluation projects.