Understanding Fan/Me, Air Volume/Pressure, and Gas Particles

1. Workers and Engineers

  - Worker: A person who understands the text 

  - Engineers: Those who understand the text, can image what they understand (e.g., can imagine the behavior of gas particles), and can systematize it.


2. Gas particle concepts that help conceptual understanding in the field of smoke control

  - One gas particle of any type has the same volume at the same temperature (at the same temperature, 1 volume of CO2 = 1 volume of H2O).

  - The mass of a gas particle is proportional to the total atomic weight of the atoms that make up the particle (H2O =18, CO2 = 44).

  - The volume of a gas particle is proportional to its temperature (increase in temperature --> increase in volume of one gas particle, mass remains the same).

  - When the temperature of a particular compartment with a leakage gap decreases, the volume of one gas particle decreases, the number of gas particles in the compartment increases, and the density increases.


3. Static Pressure, Dynamic Pressure, and Voltage

  - Static pressure (pressure caused by a greater or lesser number of gases per unit volume) 

  - Dynamic pressure (pressure caused by the density and velocity of a gas)  

  - Total pressure (static pressure + dynamic pressure) 

  - Interrelationship between pressure and air volume: two sides of the same coin. Generally, for the same energy input, an increase in pressure will decrease air volume, and an increase in air volume will decrease pressure.


4. Differential pressure = pressure loss

  - Differential pressure : △Pt(=Pt2 -Pt1), △Ps(=Ps2 - Ps1), Fan static pressure(=Ps2 - Pt1), Fan total pressure(=Pt2 - Pt1) 

  - Interrelationship between pressure loss (differential pressure) and air volume : △P=R'Q^2(Electricity --> V=IR)


5. Fan and me

- Fan = me

- Fan static pressure (voltage) = my effort (enthusiasm)

  - Airflow = my achievement (performance)

  - Suction side temperature = socio-cultural resistance

  - System resistance = external resistance (socio-cultural resistance + resistance from others)

  - Performance curve = characterization of 'my achievement' level by the size of 'external resistance'

  - Fan Power = My energy put into a specific accomplishment

  - Axial fan = A person who performs well only when 'external resistance' is low.

  - Centrifugal fan = A person who achieves the required results when the external resistance is high.

  - Smoke zone = where my achievements are displayed

  - Effective leakage (leakage that passes through the door of smoke zone and leaves the building) = the result of my hard work that leads to results.

  - Lost leakage (all leakage other than the effective leakage, leakage outside the building without passing through the control zone, airflow circulating inside the building, etc.


6. Application

  - Changes in a ping pong ball when heat is applied --> Interpretation?

  - Movement speed of people in a crowded subway station as the shape of the aisle changes --> Interpretation?

  - Surging generated by a fan --> Interpretation?




* Back to Main Procedures : General COMTAM Simulation Procedure for Pressure differential system(Mainly High-rise building) (contamsmulationlab.blogspot.com)


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