The article is devoted to solving of urgent problem to eliminate damages of two types in ventilation systems for air distribution efficiency increasing in the premises by swirled air flow, compact air jet, flat air stream and rectangular air jet. A mathematical model of air supply with swirled air flow, compact air jet, flat air jet and rectangular air stream in the room has been developed. It is shown that in order to achieve the maximum efficiency of air distribution it is necessary to ensure its supply by jets. Graphical and analytical dependences on the basis of the conducted experimental research are presented. Parameters of swirled air flow, compact air jet, flat air stream and rectangular air jet during the formation of a comfortable indoor climate are determined. The results of experimental studies of air supply to the room by the air distribution devices, which form a swirled air flow, compact air stream, flat air flow and rectangular air jet with adequate turbulence and long range of the supply air flow, are presented. It is established that with the increase of the angle of swirling plates inclination and ratio of the slit sides the air jets long range increases.
In the modern technologies related to energy transformation, namely in split-conditioners, an important place is occupied by apparatuses and processes, which energy perfection can be objectively evaluated only on the basis of analysis of their exergy efficiency. This allowed substantiating the actuality of the research task due to insufficient information on the effectiveness of the use of various refrigerants in split-conditioners. The author's innovation mathematical model for analysis of the work of one-step freon refrigerating machines, which are used in air split-conditioners, according to the exergetic method, is developed. The obtained exergetic output-input ratio (OIR) and losses of exergy in the separate elements on the example of air split-conditioner with nominal cooling capacity of 2800 W of "Daikin" firm in the standard external temperature conditions on the refrigerants R410A, R32 and proposed by the authors for the use in split-conditioners R600A refrigerant are obtained on this model. It was established that by the exergy efficiency, the R600A refrigerant is the most effective. The use of the R600A refrigerant when compared to R410A and R32 has shown the increase of the exergetic efficiency of the split-conditioner in 12.4% and 8.7%, respectively. The losses of exergy having been established in all elements of refrigerating machine of the air split-conditioner indicate that the air split-conditioner parts should be improved to reduce the losses of exergy in them and to increase its exergetic OIR in general.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.