Sizing channels arbitrary speed reduction

Sizing channels arbitrary speed reduction

Program that allows the total sizing of the ducts of an aeraulic circuit by arbitrarily reducing the air speed. The free software also allows you to calculate the prevalence of the most unfavorable circuit, the pressure drops in the individual ducts, the surface area and the weight of the ducts. Complete with instructions.

Welcome to the "Speed ​​reduction method air conditioning duct calculation" program. In an era where comfort and energy efficiency are essential in building structures, the design of air conditioning systems and the intelligent management of the air speed inside the ducts represent a crucial combination to ensure optimal indoor environments.

The reason for this program

This program was developed by Itieffe with the aim of offering an advanced and specialized approach for the calculation and design of both quadrangular and circular galvanized ducts used in air conditioning systems. Aimed at HVAC engineers, building designers, and built environment professionals, the program provides a comprehensive tool for accurately sizing galvanized air ducts and managing air velocity to ensure optimal thermal and energy comfort.

Through an intuitive and easy to use interface, you can enter the specific parameters of the air conditioning system and instantly obtain accurate calculations relating to the sizing of the ducts with the speed reduction method. In addition, the program reports data on the flow rate, the dimensions of the channels and the air speed. Calculates the head, calculates the insulation and finally indicates the total weight of the components of the system, offering a great advantage for the computation. This tool will assist you in analyzing the efficiency of your ventilation system, choosing materials and designing comfortable and well-conditioned indoor environments.

We are excited to introduce this program to you, confident that it will set a benchmark in the HVAC industry. Attention to the accuracy of calculations and the choice of the right materials will not only improve the efficiency of air conditioning systems, but will also contribute to energy savings and sustainable buildings.

We want to thank those who made this program possible and we are sure that it will become an indispensable tool for all those who are engaged in the optimization of air conditioning systems and the creation of high quality indoor environments.

Sizing channels arbitrary speed reduction

SPEED-BASED METHOD

This method, to establish the dimensions of the air ducts, involves the arbitrary choice of the speeds in the different sections of the system, starting, as mentioned, from the highest speeds near the fan to arrive, with progressive reductions, at the speeds lower in the various branches and therefore in the grilles or vents that introduce the air into the room to be ventilated.

Calculation of speed reduction channels

Program that allows the total sizing of the ductwork of an aeraulic circuit through the arbitrary reduction of the air speed.

The free software also allows you to calculate the prevalence of the most disadvantaged circuit, the pressure drops in the individual ducts, the surface and the weight of the ducts.

Complete with instructions

Instructions

The program is fairly intuitive, however the appropriate explanations are given below.

As indicated several times, only the cells with blue characters must be changed.

Below are the indications of the individual cells.

Initial data

Choice of ducts type: choice between circular or quadrangular ducts

CR roughness coefficient: make the choice based on the type of duct used.

Insulation: if present, enter the millimeters of thickness

Pd pressure drop in the diffuser: enter the value in Pascal found in the tables of the anemostats or vents used

Percent Safety Increasing (%): arbitrary percentage increase in total pressure drop.

Yield%:

  • with small centrifuges 0,30 0,50
  • b medium centrifuges 0,50 0,70
  • c large centrifuges 0,70 0,90
  • d helical 0,40 0,60

Calculation

Scraps K: percentage increase in the weight of the ducts due to scraps (material losses). Enter 1 for net weight.

Trunk: in this column enter the number of the trunk concerned 

Flow rate mc / h: enter the air flow rate in this portion of the trunk.

air speed in m / sec: enter the expected air speed in this portion of the trunk.

Enter base W (mm): enter the intended base - the height will vary accordingly based on the entered value and vice versa.

Length meters: enter the length of the log in meters.

Head calculation: enter YES if the section of the section will be used to count the total head of the circuit, NO if the section will not be counted.

Thickness tenths: compare with the previous column (*) and insert the decided value.

Example

Drawing 1

Let's consider the circuit of the drawing,

in the "Initial data" section we make the choices of the type of ducts between circular and quadrangular and we choose the material in the drop-down menu.

We put the thickness of the insulation if required.

Let's enter the pressure drops to the diffuser.

The percentage safety and the yield can also be entered after the calculations.

Let's now move on to the “Calculations” section.

Let's take an example with quadrangular channels by entering the required data in the light blue boxes (the only ones that allow it).

The program in the "Calculation" section is automatically positioned as set in the initial screen: in this case we will find quadrangular channels in galvanized sheet with flanges.

We choose the percentage of scraps K (brackets, joints, etc.); by entering 1 you will have the net weight.

We fill in the boxes as indicated and let's analyze the results.

(note that the second side of the channel is calculated automatically; you can play on the first side to get a result with different dimensions).

Let's see how the "Initial data" screen changes

In the initial screen thus recalculated we find:

the total pressure of the fan in Pascal and in mm ca;

the power in kW of the fan motor;

the surface of the channels;

the surface of the insulation;

the total weight, including any scraps from the canalization.

Furthermore:

the percentage safety of the circuit pressure drop can be increased;

the efficiency of the motor can be modified.

As an indication, let's see how the same circuit with circular ducts would look like

Where "Insert diameter D" of the duct is entered, it must be inferred with that described in the cell "Recommended diameter".

Easy true

Other free programs of the same kind offered by itieffe ▼

Sizing channels arbitrary speed reduction

The program below is free to use.

To access the reserved version (see below), full page and without advertising, you must be registered.

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