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

With the acceleration of industrialization, the environmental conditions of the production workshop are becoming more and more important for production efficiency and employee health. Among them, the ventilation rate calculation model of the ventilation system in the production workshop is an important basis for ensuring the air quality in the workshop. This paper will analyze the calculation method of ventilation frequency and its influencing factors in detail to help the chemical industry personnel to better design and optimize the ventilation system.

What is the number of air changes?

The number of air changes refers to the number of times the air in the workshop is completely replaced per unit time. It is an important indicator to measure the performance of the ventilation system, usually expressed as "times/hour. The higher the number of air changes, the more frequent the air replacement, the better the air quality of the workshop, but the energy consumption may also increase. Therefore, a reasonable determination of the number of air changes is essential to balance ventilation efficiency and energy consumption.

Formula for calculating the number of air changes

the formula for the number of air changes is:

[n = \frac{V}{A \times t}]

among them:

• (n) indicates the number of air changes (times/hour)
• (V) Indicates workshop volume (cubic meters)
• (A) represents fresh air volume (m3/s)
• (t) indicates time (hours)

it can be seen from the formula that the number of air changes is proportional to the volume of the workshop and inversely proportional to the amount of fresh air. This means that under the same workshop volume, increasing the amount of fresh air can increase the number of air changes, thereby improving air quality.

The main factors that affect the number of air changes.

1. Workshop volume: The larger the volume of the workshop, the more fresh air is required to achieve the same number of air changes.
2. Fresh air volume: Fresh air volume is the core factor affecting the number of air changes, which can be adjusted by adjusting the fan operating parameters.
3. air pollutant concentration: Workshops with high pollutant concentrations require higher air changes to quickly dilute pollutants.
4. Workshop layout workshop layout affects airflow organization, and reasonable airflow organization can improve ventilation efficiency.

The practical application of the number of air changes

in chemical production, the calculation model of the number of air changes is widely used in the following aspects:

1. design new system: Design the ventilation system according to the process requirements of the workshop and the characteristics of pollutants, and determine the reasonable number of air changes.
2. Optimize existing systems: Verify whether the ventilation rate meets the requirements through the measured data, and adjust if necessary.
3. energy saving and consumption reduction: Under the premise of ensuring air quality, optimize the number of air changes to reduce energy consumption.

Case analysis

taking a chemical workshop as an example, assuming that the volume of the workshop is 1000 cubic meters, the target ventilation rate is 6 times/hour. According to the formula:

[n = \frac{V}{A \times t}]

substituting data:

[6 = \frac{1000}{A \times 1}]

solve:

[A = \frac{1000}{6} \approx 166.67 \text {m3/h}]

therefore, the required fresh air volume is 166.67 cubic meters/hour, and the appropriate fan can meet the demand.

Conclusion

the ventilation rate calculation model of the ventilation system in the production workshop is an important tool to ensure the air quality of the workshop, improve the production efficiency and protect the health of the employees. Through reasonable design and optimization of the ventilation system, the balance of high efficiency ventilation and energy saving and consumption reduction can be achieved. Chemical industry personnel should be based on specific needs, flexible use of ventilation rate calculation model for the production workshop to create a safe and comfortable working environment.