The calculation of natural ventilation in the factory is necessary because in the process of manufacturing machinery in the factory, it is easy to generate heat and dust. The impact of high temperature conditions of hot weather outside is easy to make the space inside the factory become hotter. Therefore, the ventilation of the factory needs to be carefully calculated to effectively cool the air and purify the air, protect the health of workers, and promote high productivity.
For factory design engineers, this is considered mandatory when building a factory. But not all professionals know how beneficial it really is to ventilate the factory.
When building a factory ventilation system, the inside air will be completely circulated. Helps the sultry and polluted air caused by dust and dirt in the production process to be released to the outside. The air is always cool and fresh, ensuring the health of employees to work with high productivity.
Simple structure ventilation system installation cost is not high, but effective immediately.
Energy saving compared to other cooling methods in the factory on the market.
One of the important things in the calculation when designing and constructing the factory is determining the required air flow. From there, engineers design a suitable combination, choosing the optimal design suitable for the function of each factory.
There are usually 2 ways to calculate factory ventilation
How to calculate the ventilation flow according to the volume of the workshop
This calculation is based on the volume of the factory or enterprise applied
Tg = X*T
In there:
X is the number of times the air in the workshop needs to be replaced (times/hour).
T is the volume of the factory or factory (T=DxRxC) (m3)
Tg is the total required ventilation volume for the factory (m3/h)
How to calculate factory ventilation volume based on the number of workers
According to the standard, workers need to provide 20m3 of wind in 1 hour. Therefore, the required air volume to be supplied to the factory is calculated by applying the formula
TG = N*20
In there
N is the number of employees working in the factory ( N= Area/0.7)
Tg is the total amount of ventilation required for the factory (m3)
After calculating the amount of wind to provide, the construction contractor will calculate the design of the fan system and ventilation pipe in the factory so that it is appropriate.
To determine the number of fans needed for a factory. From there, it is possible to measure the investment cost for this item quickly according to the formula
M – Tg/Q
In there
Tg is the total volume of fresh air supplied to the factory (m3/h)
Q is the wind volume of the fan device (m3/h)
M is the number of exhaust fans needed
To calculate the design of the bone house ventilation pipe system, the construction contractor can use many different ways, but in general, the methods are all reduced to the method below.
Step 1: Determine the wind speed of the first pipe section (ω1), then based on the wind flow (L) to calculate the cross-sectional area (f) of that pipe section according to the formula:
f = L/ω
Step 2: Continue to calculate the wind speed of other pipe sections of the factory ventilation system according to the formula:
p*[(ω1)^2 – (ω2)^2]/2 – p12 = 0
In there:
ω1: Wind speed of the first pipe section.
ω2: Wind speed of the second pipe section.
∑Δp12: Total voltage loss calculated from branching point 1 to branching point 2.
Then based on the wind speed and flow of the next section to determine the cross-sectional area of that section: f2 = L2/ω2.
Step 3: Repeat the calculation in step 2 until the speed and size of all remaining ducts in the factory ventilation system are determined. The total length of the main pipe is equal to the sum of the lengths of the pipe segments plus the length of the elbow.
Usually the insulation board has the role of changing the heat in the ventilation system. Insulation sheet calculation formula
S = V*X/9000
In there:
V is the volume of the workshop ( V = D x R x C ) m3
X is the number of wind changes
S is the total area of insulation m2
From the above formulas, the contractor can make detailed and suitable drawings for all works. In order to effectively ventilate the factory, it is necessary to follow the design drawings of the factory ventilation system and strict installation procedures.
Each construction unit has different processes but in general still follow the basic process including the following steps.
Step 1: Receive factory information request
Listen to the owner's request for the desired ventilation cost service. The construction contractor receives and conducts a survey of the factory's status and features
Step 2: Draw a drawing of the factory's natural ventilation system
From the actual survey of the factory, the contractor drafted construction drawings, installation design and layout of the ventilation system. Then submit the item-specific total cost
Step 3: Build construction drawings
Finalize detailed drawings and estimated project completion time. The drawing will show the most intuitive image of the factory and ventilation system after completion for the investor to easily visualize and evaluate. Easy to unify design drawings to proceed with construction.
Construction and installation of natural ventilation system in the factory, arrange and install all kinds of suction and ventilation equipment as design drawings. Installing factory ventilation fans is an extremely important step, affecting the ventilation and cooling efficiency of the system.
Measure and calibrate to check and accept the project to ensure that the details are accurate and quality
Step 4: Acceptance of the factory's natural ventilation system item
The ink grade has completed the installation and operation, the construction unit has put it into operation
Periodic maintenance of the ventilation system after being put into use
How to calculate the factory's natural ventilation needs to pay attention to the required criteria of the design to ensure that the system is designed to suit the area. The design meets the ventilation and cooling needs of workers and machines. The design drawings provide a complete overview of the amount of equipment and costs. Equipment installation location responds effectively.
