This paper presents design calculations for a hot box experiment to define the heat recovery effect for air infiltration through a crack in an insulated wall. The design calculations are performed using a two-dimensional calculation model for combined heat and mass transfer. In the proposed measuring methodology, the temperature difference between the hot and cold climate chamber will be used to create an air exchange through two cracks at different heights in the test wall enclosed between the two chambers. The steady state transmission and infiltration heat loss through the wall will be measured at various temperature differences between hot and cold chamber. A tracer gas technique is developed to measure the infiltration flow rate. The measured transmission and infiltration losses will be compared to the additionally measured steady state transmission loss through the wall with sealed cracks (no infiltration) to determine the infiltration heat recovery effectiveness. This paper reports on numerical simulations of the proposed method, to derive the proper test conditions for a reliable measurement of the infiltration heat recovery effect.
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