STUDY OF HEAT LOCALIZATION SYSTEMS BY USING AIR-THERMAL CURTAINS

Enormous masses of cold air come into the warm rooms through the outer apertures in cold period of year. That's why the substantial expenditure of thermal energy for heating is necessary for ensuring the normal internal microclimate. Air curtains are used for prevention of external cold air flow breakthrough into warm rooms according to energy-saving technologies requirements. The proposed system of heat localization consists of heat air curtains, where the airflow from the narrow gap nozzles, by overlapping vertically in interleaved order is organized, and then merging into a single flow at the initial part, preventing the penetration of cold air. The determining factor influencing on efficient operation of the air curtains, is a complex of aerodynamic parameters such as speed, temperature of airflow, as well as geometric dimensions of single jet and common airflow, long range of flow and distance of airflow entrance. The research was aimed at identifying of optimum temperature of air flow and was carried out in several stages: studies of air curtains efficiency for various geometric dimensions of gap nozzles; determination of temperature optimal distribution while air jets interaction; study of the relative temperature of common airflow formed by air jets interaction. As a result the graphs were obtained. It was revealed that with increasing of distance the final temperature of steam is less dependent of airflow initial temperature. As a result the effective temperature range of the initial expiration, when the heat exchange with the environment is negligible was determined, and the most effective work mode of thermal air curtains was obtained.