Excerpt from Heat Transmission in Boilers, Condensers, and Evaporators The experimental data and results given in Chapter IV of the volume on H eat Transmission by Radiation, Conduction, and Convection were mostly obtained from apparatus of small dimensions. Although these results illustrated the laws of the convection of heat and their relation to the resistance offered to the flow of fluids, they could not fairly be considered to be directly applicable to large boilers or heaters Without further investigation. The first chapter of the present volume is, 'therefore, devoted to the consideration of experiments on boilers and to comparisons With the results obtained from the small apparatus previously mentioned, as well as to examples of the application of the laws of heat transmission to design. Although a large number of isolated tests have been made on boilers of various types, relatively there are but few results available of an authentic character Where the boiler has been tested at various rates of evaporation and where a fair analysis of the losses could also be made. The problems associated With the transmission of heat in surface condensers and similar plant are quite as complicated as in boilers, but for different reasons. Here again in Chapter II only authentic experiments have been discussed, and an examination of the results shows how variable may be the rate of heat transmission from the steam to the water When condensation takes place in the presence of air. The trans mission of heat in evaporative condensers and in cooling towers and ponds is similarly complicated. The transmission of heat in evaporators is more or less dependent upon the same factors as in surface condensers, but is further com plicated by the conditions associated With the circulation and evaporation of the boiling liquid or solution undergoing con centration, particularly When the evaporator is of the multiple efiect type. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.