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Simple calculation method for fresh air volume and exhaust air volume in workshop
Simple calculation method for fresh air volume and exhaust air volume in workshop
Fresh air volume calculation
New air volume calculation method
Calculated by room capacity: (applicable to divided, multiple small rooms)
Qm=N ×qm
N—number of people; (the number of people per unit area can be calculated according to the floor area ratio of the unit area, ie the number of people = area × 0.8)
Qm — fresh air volume, unit: m3/h;
Qm — The amount of fresh air required by each person (usually calculated as 30 to 50 m3/person per person).
New air volume calculation method 2
Calculated as a percentage of fresh air in total air supply:
Q fresh air volume = total Q delivery × 10 to 30% (applicable to areas with large areas)
The fresh air volume is 10% to 30% of the total air supply volume.
Note: The total air supply volume is the sum of the air supply volumes of multiple air conditioners that carry the cold (heat) load of the air conditioning area.
Exhaust air volume calculation
Exhaust air volume calculation method
Calculated by the number of air changes in the room: (applicable to split, multiple small rooms)
Q exhaust air volume = N × V
N - room air exchange times
V—room volume
Room type
Air exchange times
Room type
Air exchange times
1
bathroom
10 times / h
6
meeting room
12 times / h
2
bathroom
8 times / h
7
restaurant
10 times / h
3
restaurant
10 times / h
8
hall
5 times / h
4
Large dining hall
8 times / h
9
KTV private room
10~15 times/h
5
public toilet
15~20 times/h
10
bar
Exhaust air volume calculation method 2 (applicable to areas with large area)
Calculate 80 to 90% of fresh air volume according to exhaust air volume
Q exhaust air volume = Q fresh air volume × 80 to 90%
Case
1. A KTV entertainment venue, the ceiling of the room is 2.8m high, with 50 rooms, each room has an area of ​​28m2. Calculate the total new and exhaust air volume, and select the corresponding new and exhaust fan.
Calculated as follows:
Q new = 20 × 50 × 50m3 / h = 50000m3 / h
Q row = 28 × 2.8 × 50 × 15m3 / h = 58800m3 / h
5 BFP-10D for new fans
The exhaust fan uses six 10000m3/h fans.
2. The total air-conditioning area of ​​a shopping mall is 10000m2, and the unit load is 150w/m2. Calculate the total new and exhaust air volume, and select the corresponding new and exhaust fan.
Using the second calculation method
1. First calculate the air conditioning cooling load of the entire shopping mall, and select the variable air volume air conditioning unit;
2. Calculate the total air supply volume from the selected variable air volume air conditioning unit;
3. Calculate the fresh air volume according to the total air supply volume;
4. Calculate the exhaust volume according to the percentage of exhaust and fresh air.