Start / Livestock and aquaculture / Broiler chickens
See the minimum air flow the shed needs and how many times the shed air is renewed per hour.
Pre-sizing and estimating tool: the results do not replace a design, calculation, or report signed by a qualified professional, nor verification against the applicable standards.
Technical responsibility. This calculator is under verification. The reference values and examples are hypothetical, to illustrate the calculation, and are not technical references. The user is responsible for the data entered, the choice of parameters, and the use of the results, and must validate them with a qualified professional before any decision, purchase, application, or construction work.
Flow for rates of 0.5 to 1.5 m³/h per kg live weight; the highlighted bar is your rate.
Air changes per hour in the same shed for 5,000 to 40,000 birds; the dot is your batch.
Drag the controls to simulate data different from what you entered (from 30% less to 30% more) and watch the result change instantly.
Minimum air flow, in m³/h, for different ventilation rates and bird numbers, with the average weight entered.
The calculation done in steps, with the values you entered.
The calculation memo gathers this page's inputs, results, equations, assumptions, and references, with fields for project, responsible person, and review. The full report also includes the charts and interpretations, in color. In the print window, choose Save as PDF.
Enter the number of birds, the average weight at the time of calculation, the minimum ventilation rate of your system in m³/h per kilo, and the shed dimensions. The calculator shows the minimum airflow and the air changes per hour.
20,000 birds of 1.5 kg, rate of 1.0 m³/h per kg, shed of 120 m × 15 m × 3.5 m.
Live weight = 20,000 × 1.5 = 30,000 kg. Minimum flow = 30,000 × 1.0 = 30,000 m³/h. Volume = 120 × 15 × 3.5 = 6,300 m³. Air changes = 30,000 ÷ 6,300 = 4.8 per hour.
The minimum rate varies with the manufacturer and the age of the birds. Use the value given by the system or the strain manual; the result depends on this choice.
Because every kilo of bird produces heat and moisture. The more weight in the shed, the greater the air flow needed.
No. Air changes say how many times the shed's air is replaced per hour. Airflow says how much air comes in and out. Both are useful for comparing systems.
This is the starting point. The final choice considers the static pressure, the fan type and the air inlet system.
Important notice: the Agrocalcs tools make estimates and preliminary sizing based on the data entered and on published engineering methods. They do not replace a design, a calculation report or a report signed by a qualified professional (CREA/ART), nor verification against the applicable technical standards and legislation, such as the Regulatory Standards of the Ministry of Labor. Material and fuel properties vary: check with the manufacturer or with analyses of your process before deciding. By using the site, you agree to the Terms of Use.
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