Influence of Geometric, Thermophysical and Operating Parameters on Thermal Efficiency of Regenerative Heat Exchanger

Abstract

The influence of geometric (length, diameter and wall thickness of a unit equivalent channel of the nozzle), thermophysical (density and heat capacity of the nozzle material) and operating parameters (air flow through the regenerator and the time of one stage of accumulation / regeneration of thermal energy) on the thermal efficiency of stationary switching regenerative heat exchangers was studied . It was revealed that by varying the length and diameter of the channel and air flow, it is possible to increase thermal efficiency up to 10%. It was found that the wall thickness of a single channel, the density and heat capacity of the material of the nozzle, as well as the time of one stage, slightly aff ect the thermal efficiency of the regenerative heat exchanger.

The influence of main parameters of regenerative heat exchanger on its energy efficiency

“…Parameters of heat exchanger (regenerator) are determined from numerical implementation of the constructed mathematical model, which describes the processes of heat transfer in a single nozzle channel [9]:…”

Method for designing energy-efficient ventilation systems based on regenerative heat exchangers

“…where ΔTmax=(Tin −Tout) is the maximum possible cooling or heating of air in the nozzle from Tin to Tout, acc °C; δT is cooling (heating) of internal air in the nozzle averaged for the accumulation (regeneration) stage, °C, it was obtained from mathematical modelling of heat transfer between air and nozzle in a single SSRHE channel [9]. The nozzle design is considered energy efficient for E ≥ 0.9.…”

“…Therefore, the purpose of this paper is to create a method for designing and selecting SSRHE for ventilation systems in building. The method is based on the previously published studies [8][9][10].…”