Calculation Model of Ventilation Times of Ventilation System in Production Workshop?

Production workshop ventilation system ventilation times calculation model

In the chemical industry, the design of the ventilation system in the production workshop is very important, because it is not only related to the comfort of the production environment, but also directly affects the health of workers and the safety of the production process. As one of the core parameters in the design of ventilation system, the calculation model of air exchange rate is the key to ensure that the air quality of the workshop meets the standard. This paper will analyze in detail how to calculate the number of air changes scientifically from the basic concept, calculation method and influencing factors of the number of air changes.

1. Ventilation Rate Basic Concepts

The number of air changes refers to the number of times the indoor air is completely updated in a unit time. Simply put, it is how many times the ventilation system completely replaces the air in the workshop within 1 hour. The number of air changes directly affects the air quality in the workshop. If the number of ventilation is insufficient, it may cause harmful gases or dust to be discharged in time, affecting the health of workers; and if the number of ventilation is too high, it may increase energy consumption and cause unnecessary waste.

2. ventilation rate calculation method

The calculation of the number of air changes usually involves the following steps:

1. Defining the number of air changes Before calculating the number of air changes, the definition of the number of air changes must first be clarified. Generally speaking, the number of air changes can be calculated by the following formula: [ n = \frac{V}{A \times t} ] Among them,(n) is the number of air changes, (v) is the air volume of the air conditioning or ventilation system (cubic meters/hour),(a) is the volume of the workshop (cubic meters), and (t) is the time (usually 1 hour).

2. Calculate the volume of the workshop The calculation of the workshop volume needs to be carried out according to the actual size of the workshop. For example, if the length, width, and height of the workshop are (L), (W), and (H)(in meters), the workshop volume (A = L \times W \times H).

3. Determine air volume The calculation of air volume needs to be based on the design parameters or actual measured values of the ventilation system. In the chemical plant, the air volume is usually determined by the cleanliness requirements, the concentration of harmful gases and the emission of process equipment.

4. Choosing the appropriate calculation model According to the specific situation of the workshop, select the appropriate air change number calculation model. For example, for workshops that need to control the concentration of harmful gases, the following formula can be used: [ n = \frac{C0 - C}{C \times A \times t} ] Among them,(C0) is the indoor target concentration, and (C) is the outdoor environmental concentration.

3. Factors Affecting Air Change

In practice, the calculation of the number of air changes needs to consider a number of factors:

1. Size and layout of the workshop The larger the volume of the workshop, the higher the number of air changes usually required. The layout of equipment in the workshop also affects the path and efficiency of air flow.

2. Type and concentration of pollutants Different pollutants have different properties, such as harmful gases, dust, steam, etc. The concentration and toxicity of these pollutants directly affect the calculation of the number of air changes.

3. Types of ventilation systems Depending on the type of ventilation system (such as natural ventilation, mechanical ventilation, local exhaust, etc.), the calculation method of the number of air changes will also be different. For example, in a local exhaust system, the number of air changes needs to consider the air volume and location of the exhaust outlet.

4. Regulations and Standards The calculation of the number of air changes also needs to comply with relevant regulations and standards. For example, China's "Hygienic Standards for the Design of Industrial Enterprises" puts forward specific air exchange requirements for different types of production workshops.

4. Ventilation Frequency Optimization and Practice

Optimizing the calculation of air exchange rate can not only improve the air quality of the workshop, but also reduce energy consumption. Here are some practical suggestions:

1. Adjust the number of air changes according to the process requirements. For different production processes, the requirements for the number of air changes are also different. For example, in a workshop with high toxic and harmful gases, the number of ventilation needs to be higher; in a general clean workshop, the number of ventilation can be appropriately reduced.

2. Adopt dynamic adjustment In actual operation, the number of air changes can be dynamically adjusted according to the real-time harmful gas concentration or temperature and humidity changes in the workshop. This not only improves air quality, but also saves energy.

3. Introduction of intelligent management With the development of the Internet of Things technology, the environmental parameters in the workshop can be monitored in real time through sensors and automated control systems, and the operating parameters of the ventilation system can be automatically adjusted according to requirements.

5. summary

The calculation of ventilation rate is an important link in the design of ventilation system in chemical workshop. Through scientific calculation model and reasonable adjustment strategy, it can ensure that the air quality in the workshop meets the standard and reduce energy consumption at the same time. For chemical companies, mastering the calculation method of the number of air changes is not only a manifestation of fulfilling environmental protection and safety responsibilities, but also an important means to improve production efficiency and worker health.