Calculation of pressure drops for flexible channels

Calculation of pressure drops for flexible channels

Calculation of pressure drops in ducts and flexible ducts. Complete with diagram

Before going into the details of the program for calculating the pressure drops of flexible circular air transport channels in air conditioning systems, it is essential to recognize its importance in such HVAC (Heating, Ventilation, and Air Conditioning) systems.

Pressure drops refer to the pressure that air loses as it flows through ducts, filters, elbows and other system components. Understanding and effectively managing these leaks is crucial to ensuring optimal operation of your HVAC system and reducing operating costs.

Pressure drops can directly influence the overall performance of the system, the uniform distribution of air inside the building and energy efficiency.

A correctly designed and sized system, carefully considering pressure drops, can help reduce energy consumption and improve occupant comfort.

The reason for this program

The program we will describe was developed by Itieffe to simplify the calculation of pressure drops in flexible circular ducts, allowing engineers and HVAC designers to accurately and efficiently evaluate the impact of pressure drops on the system.

During this description, we will explore the key features of the program in order to calculate pressure drops accurately.

Furthermore, we will highlight the importance of considering other variables such as the diameter of the ducting, the air flow rate and its speed, which can influence the pressure drops in the air conditioning system.

Using this program, users will be able to optimize flex duct sizing and make informed decisions to improve the overall efficiency of the HVAC system.

In summary, our calculation program is a very useful tool for quickly calculating head losses. It ensures efficient and reliable operation of air conditioning systems, contributing to better energy management and the comfort of building occupants.

Pressure drops of flexible channels

Calculation of the pressure drops in the ducts and flexible ducts (flex) and the necessary insulation.

Complete with diagram

Instructions

How to proceed

Let's consider a circuit with delivery plenum and ducts all with the same section:

  • we choose the diameter of the flexible duct (Ø) in mm;
  • we set the air speed in meters per second (m / sec);
  • we enter the length of the section in meters;
  • we indicate whether the trait falls within the account for the calculation of the prevalence (yes or no);
  • We enter the thickness of the insulation in mm;
  • We indicate the pressure drop of the diffuser (manufacturer tables);
  • We set the security percentage on the rise.

Let's read the results:

pressure drop in the most disadvantaged circuit in Pa - 8;

head loss resulting in Pa - 42 (Total);

duct area in m² - 30;

insulation surface in m² - 37.

To calculate only the total head in many standard applications including a general delivery plenum with several branches of the same size but with different section sizes, only the following must be entered in the program: the diameter of the duct, the air speed, the length of the longest section of the branch, enter “yes”, the pressure drop in the diffuser and lastly a percentage increasing the head as a safety factor.

good job

Other free programs of the same kind offered by itieffe ▼

Pressure drops of flexible channels

The program below is free to use.

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