The pressure drop and flow characteristics of short capillary tubes have been investigated experimentally for length-to-diameter ratios varying from 0.45 to 18 at diameter Reynolds numbers ranging from 8 to 1500. In the range of the dime

This report describes a technique which models the infiltration process for an entire enclosure more accurately than standard methods. Both air flow and convective/conductive heat transfer are accounted for to (a) improve building heat load calculations, (b) determine the important characteristics of existing (and new) buildings for infiltration heat loads, and (c) account more accurately for wind effects.

Unnecessary air infiltration ,draftiness, in buildings can be a major cause for excessive energy consumption. A method for using sound to locate, for subsequent sealing, the openings of air infiltration leakage paths in buildings has been investigated. The results of pertinent analytical studies, laboratory experiments, and field applications of this acoustic location method are reported, and a plan is provided to encourage national implementation of the method.

The growing interest in the response of structures to turbulent wind forces and the realization of the important role played by root-coherence in the prediction of such response has led to the proposal of several expressions for the power

For use in various wind engineering applications, it is desirable to have a consistent relationship by which to project height variations of both 'instantaneous' winds and parameters of the wind speed probability distribution. The power

Although there has been an increasing use of wind-tunnel tests on models to examine the structure of wind around buildings, there has been surprisingly little research into the correlation between the results of such studies andthe wind pattern around the full scale structures. This report gives the results of a comparison between the wind flow about a relatively open area of the city of Liverpool, as measured by the relative exposures of twelve field anemometers, and the flow observed in a 1:500 scale model of the same area immersed in a profiled, turbulent, wind tunnel flow.

In this paper it is our intention to consider that ventilation is the circulation or passage of an air supply through an enclosure resulting in the displacement of some or all of the air contained in that enclosure by thesupply air. Depending on the character and condition of the supply air it can dilute or change the quality of the air in an enclosure as well as alter its temperature and humidity. A mathematical analysis of the ventilation process appears later in this paper.

This paper describes the experimental techniques devised to measure the necessary parameters on installed heating systems. With these data the seasonal performance of a heating system can be computed. The effectiveness of various operating and system modifications can then be predicted. Thecalculated effects of some modifications are presented in a companion paper.

Infiltration and its effects, measurements, calculations, and typical values are presented and discussed.

The effect of ventilation in the space between a main wall and an exterior siding is examined with respect to reducing the building's cooling load. The buoyant force of the air in the space is considered as the motive force of air flow and the effect is treated as a problem of simultaneous heat and mass-transfer. A simulation program of heat and air flows in a wall has been developed using laminar flow theory, and its validity is examined by thecomparison of the simulation results with a weather exposed full-scale model test.