Studies influence on energy loss of an air curtain installed at building entrance. The energy loss consists of transmission loss and ventilation losses caused by stack effect, pressure difference due to wind, direct wind on the entrance and differences in the specific gravity of inside and outside air. Gives an example of calculated energy loss at the entrance of a simulated department store. Outlines principles and types of air curtain.
One cause of these discomfort zones is cold air infiltration through window joints. This can be deflected using a warm air curtain. Describes tests showing that the degree of deflection depends to a large extent on the pulse ratio of the intermixing air flows. Describes chart compiled when experimental results were evaluated permitting determination of volume of air to bedischarged by nozzle convectors sufficient to diminish discomfort zone.
Argues that heat losses and ingress of cold air through factory doors are best reduced by the use of air locks and air curtains. Derives equations defining heat losses through unprotected doors. Illustrates air balance of an industrial shed. Diagrammatically illustrates in a graph relation of heat losses to size of entrance. Treats methods and effectiveness of reducing heat losses by air curtains and air locks respectively. Recommends unheated air locks except for circumstances dictating use of air curtains.
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