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

In the chemical production workshop, the design and operation of the ventilation system is very important to protect the health of workers, improve production efficiency and ensure product quality. Among them, the ventilation rate calculation model is the core part of the ventilation system design, which directly affects the ventilation effect and energy consumption.

1. What is the ventilation rate?

The number of air changes refers to the number of times the air in the workshop is completely replaced per unit time. Simply put, the higher the number of ventilation, the fresher the air in the workshop, and the lower the concentration of harmful gases and dust. The calculation of the number of air changes is of great significance to ensure that the workshop environment meets safety standards and environmental protection requirements.

2. The ventilation rate calculation of the basic formula

The calculation of the number of air changes is usually based on the volume of the workshop and the total air volume of the ventilation system. The specific formula is as follows:

ventilation rate = total air volume/(room volume × 3600)

among them, the total air volume refers to the sum of the air supply volume and the exhaust volume in the ventilation system, and the unit is generally cubic meters per hour (m/h). The room volume is the length × width × height of the workshop, and the unit is cubic meters (m³). 3600 is the conversion factor that converts hours to seconds.

3. Calculate the number of ventilation specific steps

To calculate the number of air changes, you first need to determine the following key parameters:

• Workshop volume: According to the actual size of the workshop, for example, the length, width and height are 30 meters, 20 meters, 10 meters of the workshop, the volume is 30 × 20 × 10=6000 cubic meters.
• Air supply volume and exhaust volume: determined according to ventilation design, for example, the air supply volume is 8000 m/h, the exhaust volume is 4000 m/h, and the total air volume is 12000 m/h.
• Calculation formula: ventilation rate = 12000 / (6000 × 3600) ≈ 0.33 times/hour.

Through the above steps, the number of air changes in the workshop can be obtained. The higher the air change rate, the faster the air renewal rate, which helps to improve the air quality of the workshop.

4. Factors affecting the number of air changes

The calculation of the number of air changes is not static, it is affected by many factors:

• Workshop volume: the larger the volume, the same air change the number of required air volume is greater.
• Pollutant production: high pollution source of the workshop needs higher air change times.
• Ventilation: the use of full ventilation or local ventilation will affect the calculation results.
• Safety standards: different industries and regions of the safety standards may be the number of air changes have different requirements.

5. Ventilation times optimization and energy saving

In practical application, the calculation model of air exchange rate should not only meet the requirements of safety and environmental protection, but also consider energy saving. Too high or too low air changes will cause unnecessary energy consumption. Therefore, it is an important goal of ventilation system design to reasonably design the number of air changes and balance the air quality and energy consumption.

6. Summary

The calculation model of ventilation rate is the key link in the design of ventilation system in chemical production workshop. Through scientific calculation and reasonable design, the air quality in the workshop can be guaranteed to meet the standard, while reducing energy consumption and improving production efficiency. For chemical companies, regular inspection and optimization of the ventilation system to ensure that the number of air changes meets the requirements is an important measure to ensure production safety and employee health.