Digital computer simulation of complex radiant heat load.
Abstract The exchange of radiant heat between an absorber and a variety of radiators in its surroundings is capable of calculation by digital computer. When the absorber is characterized as a black body, the calculated results may represent the maximum potential radiant heat load upon a man occupying the absorber location. Calculations of heat exchange for a matrix of absorber locations within a work space permits the construction of isopleths of heat load in that work space; this may be done for any elevation of interest. The contribution made by each individual radiator to the heat load on absorbers at the various locations may be obtained. Repeated computer runs using simple changes in input data may be used to simulate various alternatives for control of radiant heat exposures. Use of a digital computer permits mathematical assessment of radiant heat exchange problems for which manual calculations would be prohibitively time consuming and costly.
Calculation of Complex Radiant Heat Load From Surrounding Radiator Surface Temperatures
Abstract A method for calculating the radiant heat exchange between an absorber and individual radiating components in its surroundings is reported. Radiator surface temperatures, ambient and absorber temperatures, and configuration factors for radiating components in the surroundings are used in the customary radiant heat exchange formulae. Simplified methods for calculating or estimating configuration factors for radiators of various shapes solely from angles, subtended at the absorber by the radiators are presented. The method has been verified in the laboratory under controlled conditions and has been used to advantage in the field studies. The method has advantages over the globe therometer method in certain applications.
Rapid determination of the effectiveness of insect resistant packaging
A technique was developed to evaluate the usefulness of odour barriers and to determine the effect of package content in consumer size packages on resistance to infestation by insects. Female Plodia interpunctella (Hubner) could distinguish sealed packets containing food from non-food items as a suitable site for oviposition. Utilization ofthis technique will reduce the time needed to evaluate new materials for use in insect resistant packaging.