On analysis of operating efficiency of autonomous ventilation systems

Abstract

Abstract. The paper deals with the causes and consequences of malfunctioning of natural and mechanical ventilation systems in civil buildings of Russia. Furthermore it gives their classification and analysis based on the literature review. On the basis of the analysis technical solutions for improving the efficiency of ventilation systems in civil buildings are summarized and the field of their application is specified. Among the offered technical solutions the use of autonomous ventilation systems with heat recovery is highlighted as one of the most promising and understudied. Besides it has a wide range of applications. The paper reviews and analyzes the main Russian and foreign designs of ventilation systems with heat recovery that are mostly used in practice. Three types of such systems: UVRK-50, Prana-150, ТеFо are chosen for consideration. The sequence of field tests of selected autonomous ventilation systems have been carried out in order to determine the actual air exchange and efficiency of heat recovery. The paper presents the processed results of the research on the basis of which advantages and disadvantages of the tested ventilation systems are identified and recommendations for engineering and manufacturing of new design models of autonomous ventilation systems with heat recovery are formulated.

Version of a mathematical model of purge ventilation system with a complex recuperative heat exchanger

“…One of the main directions of increasing the efficiency of ventilation units is the use of devices and equipment complexes for the utilization of lower-grade heat [1], [13]. This makes possible to reduce emissions of harmful substances and lower-grade heat in order to protect the environment and improve environmental safety of the adjacent to the building territory [1] to [3].…”

“…In ventilation systems, recuperation is the transfer of heat from the air removed from the room to the supply air taken from the outside of the building using the supply fan. Recuperation uses purge units with plate and rotary heat exchangers (recuperators), with and without enthalpy (moisture return), as well as ceramic recuperators (regenerators) of heat [13]. The supply and exhaust system with heat recovery is designed to obtain constant air exchange due to mechanical ventilation in private homes, offices, hotels, cafes, conference halls, other domestic and public premises, industrial buildings, as well as the recovery (return) of heat energy from the air removed from the premises to heat the supply purified air.…”