The condition of the air environment in modern agricultural buildings is provided by means of the microclimate air conditioning systems (MACS). However traditional MACS and their equipment are quite expensive, power-intensive and difficult in operation. Therefore relevant is a problem of development and use of simpler, reliable, energy-efficient systems and devices of conditioning of a microclimate for creation and maintenance of the required technological parameters of the air environment providing decrease in energy consumption and increase in efficiency in poultry farming has important social value. Air conditioning system of a microclimate of the agricultural building has to represent complex application active (air conditioning systems) and passive (external protections) engineering means. Need of recirculation of air is caused by considerable overexpenditures of warmth during the cold period of year and cold during the warm period of year. It is connected with the fact that norms of air exchange for the warm and cold periods of year differ several times, at the same time the total value of air supply remains to a constant. Infiltration is an unorganized air intake to room through leakage of buildings protections under the influence of thermal and wind pressure and, possibly, due to the work of mechanical ventilation. Accounting losses of heat in poultry-farming rooms and dispensing of ventilation volume, the major factor is the air infiltration through construction and enclosing structures that significantly affects the gas consumption for space heating and on the final cost of production.
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