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MEASURES AND EQUIPMENT OF A STANDARD POULTRY HOUSE

The environmental simulation is calculated considering a poultry house with the following features:
- 120 meters long by 17 meters wide
- 2.2 meter high wall and ceiling 4.2 meters maximum height
- Cross ventilation (winter) and tunnel ventilation (in summer)
- 37 Radiant brooders
- 78 square meters of cooling pad system.
- Ceiling insulating material: 4 centimeters thick of polyurethane foam board faced on both sides with aluminum foil
- Wall insulating material: 5 centimeters thick of polyurethane sandwich panel
- Cost kilowatt/h.= 0,11 €
- Cost of propane 0,93 €/Kg.

If you want to make environmental simulation on a poultry house different from 'Standard House', you must first go into 'CALCULATION OF EQUIPMENT'.

SIMULATOR

INPUTS COLUMN
ENVIRONMENTAL AND PRODUCTION DATA

Outdoor temperature
 ºC

Outdoor Relative Humidity
 %

Desired Indoor temperature
 ºC

DESIRED R. Humidity int.
 %

Number of birds
 birds


Average weight per bird
 kg

HEATING SETTING

State of heating

Heating offset
 ºC


Resultant internal temperature to start heating

PROGRAMMING OF THE STATIC PRESSURE

Current static pressure in the poultry house
pascals








MINIMUM VENTILATION SETTING

Minimum ventilation flow
 m³/h



Maximum level of CO2 allowed

PROGRAMMING THE START OF VENTILATION DUE TO EXCESS TEMPERATURE

Degreess above desired temperature
 ºC


Inside resultant Tª to start ventilation by excess Tª




Offset of each no tunnel fan
 ºC


Sum of offsets of all no tunnel fans
 


TUNNEL VENTILATION PROGRAMMING

Degrees above the desired temperature to start tunnel
 ºC


Resultant OUTDOOR temperature to start Tunnel



Offset of each tunnel fan
 ºC


Sum of offsets of all tunnel fans



COOLING SYSTEM PROGRAMMING

Degrees above the desired temperature to start cooling
ºC


Resultant OUTDOOR temperature to start cooling
% maximum moisture with cooling
 %

Air flow in cross ventilation with humidifying working
 m3/h.kg


RESULTS COLUMN

AVERAGE ENVIRONMENTAL VALUES INSIDE THE POULTRY HOUSE
Average temperature inside the poultry house
Average humidity content in poultry house
CO2 concentration in House (in P.P.M.)
Average air velocity at the height of the birds (in meters / second)
Thermal PERCEIVED SENSATION by birds taking into account the temperature,
humidity, air velocity and age of birds (approximate value).

CURRENT VENTILATION TYPE
CURRENT VENTILATION TYPE:
VENTILATION MODES

FLOW VENTILATION
Minimum ventilation flow
Ventilation flow excess temperature
VENT FLOW TOTAL (REAL) Resulting ventilation coefficient

NUMBER OF FANS RUNNING (considering current static pressure):






AIR INLET IN THE FARM
Caudal de aire que entra por las trampillas
% opening of side wall air inlets
Air velocity at the entrance of the house
Atmospheric static pressure inside the poultry house

INTAKES
Feed Daily feed intake
Water
Drinking water intake by birds
water intake to environmental humidification
Propane consumption:  Propane Cost (in €):
Electricity   Instantaneous electricity consumption of the ventilation
Electric Cost of the ventilation

PRODUCTIVE PARAMETER COMPARISON between the current temperature
and the more profitable temperature
NOTICE
Temperature with the lowest
conversion: 21.8ºC.
Higher growth temperature: 18ºC.
Source: Yahav et al. (1996).

CALCULATIONS ZONE

COEFFICIENTS
Side air inlet velocity according to the width
m² Side air inlet installed
tunnel air inlet velocity m/s
m² air inlet installed in ventilation tunnel
Actual small fan flow m³/h
Actual big fan flow m³/h
Number of tunnel fans used in transitional
Number of tunnel fans used in tunnel level 1 m³/h
Total Heat bird (Qs + Ql) 20ºC W/bird
Adaptation Qtotal (different Tª) at 1000w W/1000 W
Adaptation Qsensible (different Tª) at 1000w W/1000 W
Qtotal (Ql + Qs) / bird (inside Tª) W/bird
Qsensible / bird (by formula) W/bird
Qlatente / bird (by formula) W/bird
Actual moisture emission per bird g water/bird/hour
Qlatente / bird (Real) W/bird
Absolute humidity outside g/m³ kg water /Kg air
Wet bulb temp outside air ºC
Eficiencia sistema de humidificación %
Outside air enthalpy kj/kg
Atmospheric pressure milibares
Humidity abs. desired interior (c. real) g/m³ kg water /Kg air
REAL abs humidity inside mean g/m³ kg water /Kg air
abs humidity inside start house g/m³ kg water /Kg air
abs humidity inside half house g/m³ kg water /Kg air
Humidity inside abs end house g/m³ kg water /Kg air
INSIDE air density considering the temp, Hª and atmospheric Pressure Kg/m³ km³/kg.
Z=
Xv=
OUTSIDE air density considering the temp, Hª and atmospheric Pressure Kg/m³
Z=
Xv=
Specific heat of air j/kgºC
Latent heat of vaporization at 20ºC j/kg
Value number e
Calorific power propane j/kg
Water consumption bird / day (formula) mililitros
(*) Feed consumption per bird at the temperature where you get the best performance (21.8 ºC) gr/day
gr/day
(*) Growth per bird at the temperature where you get the best performance (21.8 ºC) gr/day
gr/day
(*) valid birds between 5 and 8 weeks of age
CALCULATION OF MINIMUM VENTILATION REQUIREMENTS (for O2, CO2 and humidity)
Ventilation needs to provide OXYGEN consumed by birds m³/h
consumed by heating m³/h
Total requirements for O2 m³/h/kg liveweight
Ventilation needs to remove CO2 produced by birds m³/h
produced by heating m³/h
Total requirements CO2 m³/h/kg liveweight
Ventilation needs to remove moisture produced by the birds m³/h
produced by heating m³/h
Total requirements water m³/h/Kg. liveweight
Total NEEDS OF MINIMUM VENTILATION m³/h/Kg. liveweight
Minimum ventilation flow advised by Ross m³/h/Kg. liveweight

CALCULATION OF VENTILATION NEEDS TO REMOVE THE EXCESS TEMPERATURE
Ventilation needs to remove the excess temperature of the poultry house
m³/h/Kg. liveweight

ENERGY BALANCE STUDY OF THE POULTRY HOUSE
Metabolic heat brought by birds
Heat transmitted by enclosures Heat transfer from the wall
Heat transfer from the roof
Total heat
Heat lost by minimum ventilation
Semibalance
Heat from the heating
Heat lost by ventilation of excess temp without humidification
Heat rejected by refrigeration
Ending Balance close to 0 W
The house is in thermal equilibrium, so that the indoor temperature is stable over time


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