This report presents the results of measurements of the heat transfer coefficients for air spaces of various emissivities and thicknesses. The data were obtained for five different orientations and directions of heat flow, ranging from heat flow vertically upward to heat flow vertically downward, and encompass a range of values of temperature difference across the air space.

No abstract

No abstract

No abstract

A description is given of a program of comparative thermal conductivity tests made in seventeen different laboratories on corkboard at mean temperatures from 20 F to 130 F with 20 different guarded hot plates. The objective of the program was to determine the reproducibility of results obtained in tests made in accordance with the requirements of ASTM Method of Test C 177-45. Examples of results showing good and poor agreement are presented and discussed. Histograms are given showing the frequency distribution of the average differences between the results obtained with each apparatus and the corresponding results obtained with a reference apparatus.