Numerical simulation for a regenerative heat exchanger in a ventilation system with a periodic change in the airflow direction
S.P. Aktershev, N.N. Mezentseva, I.V. Mezentsev, R.S. Gorelik
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: regenerative heat exchanger, ventilation system, parametric study, energy efficiency
Abstract
The paper presents a developed 2D mathematical model for a regenerative heat exchanger designed for a ventilation system operating with a periodic change in airflow direction. This kind of ventilation system saves the heat energy required for heating of domestic premises during a winter season. Results for calculations by a two-dimensional model are compared with one-dimensional modeling and with available experimental data. The authors formulated a definition of energy efficiency in terms of reduction in heat losses. Our calculations demonstrate that the efficiency of a regenerative heat exchanger might exceed 90 %. The numerical simulation was applied for parametric study of this problem; we revealed the influence of the heat exchanger operational and design parameters on the energy efficiency. Numerical experiments found a group of parameters most significant for energy efficiency of ventilation system; recommendations on system optimization were formulated.
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