# Do you know all 8 performance curves of centrifugal compressors?

19-04-2022
As the most energy-saving product in modern industrial gas compression equipment - centrifugal compressor, its various performances are represented by various curves, and you can choose suitable equipment by understanding the performance curves. centrifugal compressor
performance curve
1. Pressure x flow 2. Power x flow Change curve of main components
1. Change curve of impeller blade outlet angle   2. Intake valve adjustment curve  3. Temperature change curve 4. Intake pressure change curve  6. Atmospheric pressure control change curve Each curve is silently telling you the overall performance of the centrifugal compressor, and the change of each curve will affect your choice. To understand these curves and understand their inherent, it is not easy to choose the right equipment. Blind.

Calculation method of fresh air volume 1

Calculated by room capacity: (applicable to divided, multiple small rooms)
Qm=N ×qm

Qm — fresh air volume, unit: m3/h;

qm - the fresh air volume required by each person (generally calculated as 30-50m3/person per person);

N—number of people; (the number of people in a unit area can be calculated according to the floor area ratio per unit area, that is, number of people = area × 0.8).

Fresh air volume calculation method 2

Calculated as a percentage of fresh air to total supply air:

Q fresh air volume = Q total supply volume × 10 ~ 30% (applicable to areas with relatively large areas), fresh air volume takes 10% to 30% of the total supply air volume

Note: The total air supply volume is the sum of the air supply volume of multiple air conditioners carrying the cooling (heating) load of the air-conditioning area.

Calculation method of exhaust air volume 1

Calculated by the number of room air changes: (applicable to divided, multiple small rooms)

Q exhaust air volume = N × V

N—the number of air changes in the room

V - room volume

Calculation method of exhaust air volume 2

Calculated by taking 80-90% of the fresh air volume according to the exhaust air volume

Q exhaust air volume = Q fresh air volume × 80～90%

Case: A KTV entertainment place, the ceiling height of the room is 2.8m, there are 50 rooms, and the area of each room is 28m2. Calculate the total new and exhaust air volume, and select the corresponding new and exhaust fans.

The calculation is as follows:

Qnew=20×50×50m3/h=50000m3/h

Q row=28×2.8×50×15m3/h=58800m3/h

5 BFP-10D for fresh air fans

The exhaust fans use 6 sets of 10000m3/h fans.

2. The total air-conditioning area of a shopping mall is 10,000m2, and the unit load is 150w/m2. Calculate the total new and exhaust air volume, and select the corresponding new and exhaust fans.

Use 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 air volume according to the percentage of exhaust air and fresh air.

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