An experimental investigation of the thermal efficiency and pressure drop for counterflow heat exchangers intended for recuperator

Abstract

Ventilation systems are responsible for a large part of total energy consumption in operated buildings. The possibility of significant energy savings has been noticed when using mechanical ventilation. In order to decrease energy consumption, devices called recuperators are used and their main element responsible for heat recovery is the heat exchanger. In this work, thermal efficiency and pressure drop at individual heat exchangers designed for recuperators were examined. The results of the analysis and the influence of parameters on the device operation are presented. Finally, the thermal efficiency of the entire unit was evaluated. The results were compared and the phenomena occurring in the device itself affecting the differences in calculated efficiency were described.

Unsteady Numerical Investigation Strategy of Natural Convection in an Isosceles Superimposed Triangular Enclosure

“…The finite volume numerical method was applied in this paper. The related algebraic equations entail the functions discretized using the finite difference method and integrated using the finite volume approach utilized in the CFD code were compared in this context and the SIMPLE algorithm [34] was selected.…”

“…Many residential and commercial applications heavily rely on energy transfer analysis in triangle-shaped enclosure heated from the side or below [28][29][30][31][32][33], like heat transfer through the roof Buildings, swimming pools, dough mixer and ice cream and juice cooler. Additional flow-related phenomena have been discussed in [34][35][36] among other places. In this study, a triangle's inherent convection combined with momentary convection in an isosceles-superimposed triangular enclosure is suggested as a solution for natural convection heat transfer difficulties in a steady state, such as free convection in an equilateral triangle cavity.…”