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Total Pressure Required Formula:
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Total Pressure Required at Inlet to Duct is the amount of pressure required at the inlet or outlet of ducts/pipes to overcome friction losses and maintain the desired velocity pressure in the system.
The calculator uses the Total Pressure Required formula:
Where:
Explanation: The total pressure required is the sum of pressure loss due to friction in the ducts and the velocity pressure needed to maintain air flow velocity.
Details: Accurate total pressure calculation is crucial for proper HVAC system design, fan selection, and ensuring adequate airflow throughout the duct system.
Tips: Enter pressure loss due to friction and velocity pressure values in Pascal. Both values must be non-negative numbers.
Q1: What is pressure loss due to friction in ducts?
A: Pressure loss due to friction is the energy lost in fluid transportation through a pipe due to friction between the fluid and pipe wall.
Q2: What is velocity pressure in duct?
A: Velocity pressure is the pressure required to accelerate air from zero velocity to some velocity (V) and is proportional to the kinetic energy of the air stream.
Q3: What are typical values for pressure loss in duct systems?
A: Typical values range from 0.5 to 2.5 Pascal per meter of duct length, depending on duct size, air velocity, and surface roughness.
Q4: How does duct material affect pressure loss?
A: Rougher duct materials (like flexible ducts) create more friction and higher pressure losses compared to smooth materials (like sheet metal).
Q5: Why is total pressure important for fan selection?
A: Fans must be selected to provide sufficient total pressure to overcome both friction losses and maintain the required velocity pressure throughout the system.