Abstract
With the advent of central heating, it became necessary to establish numerical criteria for indoor comfort and a basis for calculation. The paper traces the development of indices of personal warmth and the evolution of methods of heat loss calculation. Both were originally based on air temperature, but the realisaion of the significance of radiation led on the one hand to equivalent and resultant temperature as indices of warmth, and on the other to environmental and sol-air temperature for calculation purposes. There was a natural desire to use one index for both purposes. The paper traces the steps towards this, for which there was no theoretical justification. It is finally observed that for both purposes, separate treatment of radiation and convection may be preferable.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
