Document O382vabLoyxYV0Lb55drzjDGw

Copyright 1956 BY THE American Society op Heating and Air-Conditioning Engineers, Inc. AND BY IT Dedicated To the Advancement op The Propession and Its Allied Industries TEXT AND ILLUSTRATIONS ARE FULLY PRO TECTED . itr coeyB1c5ht : and nothing hhat APPEARS MAY BE -REPRINTED EITHER WHOLLY OR IN PART WITHOUT.'SPECIAL PERMISSION. Printed and Bound by Waverly Press, Inc. BALTIMORE MARYLAND O. S. A. PREFACE T FHE 34th EDITION The 34th Edition of the Heating Ventilating Aib Conditioning Guide, 1956; contains 1176 pages of technical text--16 pages more than the'largest previous edi tion. In addition, new material equivalent to 14 pages has been added where con densation of previous text was possible. Substantial improvements have been made in 16 chapters, some of which have been almost completely rewritten. In the outline of changes which follows,;it will be noted that special attention has been given to subjects dealing with heat transmis sion of building materials, cooling load; chimneyB, estimating fuel consumption, baseboard and finned-tube radiation, snow melting, central, systems for air condiT tioning, air duct design, air heating and cooling coils, automatic control, pipe and tube characteristics and insulation, automobile air conditioning, heat ` transfer measurements, and codes and standards. The following paragraphs describe the significant changes in the chapters having the most important revisions:. Chapter 1--Terminology. Revisions have been made, in several, definitions to obtain agreement with values adopted by the 9th and 10th General Conference on Weights and Measures. Chapter 4--Fluid Flow. Most of the illustrations have been improved. A number of clarifications have been made in the text. . Chapter 9--Heai Transmission Coefficients of Building Materials. The chapter has been enlarged to permit addition of many materials to the list showing design values for conductivity and conductance.. New information, has been included for estimat ing the conductances of air spaces bounded by reflective surfaces. New tables facilitate the determination of the effect of adding insulation to wall, floor, and roof sections. A new chart makes it possible to correct quickly for the effect of framing members. The revision was prepared by the ASHAE Technical Advisory Committee on Insulation assisted by staff members of the ASHAE Research Laboratory. Chapter IS--Cooling Load. Weather design data have been added for 21 Canadian cities, and a number of improvements have been made in the text. Chapter 17--Chimneys and Draft Calculations. The discussion of the theory of draft calculations has been rewritten. The sections oh residential chimneys and gas appliance chimney requirements have been revised and enlarged. Chapter 18--Estimating Fuel Consumption for Space Heating. The table of degree days has been extended to include 287 U. S. and 40 Canadian cities using up-to-date information furnished by the XJ. S. Weather Bureau and the Canadian Meteorological Service. Chapter 22--Hot Water Heating Systems. A number of improvements have been made in the section on high temperature systems. Chapter 2S--Radiators, Convectors, Baseboard and Finned-Tube Units. Sections were added to .supply information on baseboard and finned-tube units of present design. The chapter was largely rewritten. Chapter 2\--Panel Heating. The section on snow melting was rewritten and en larged to include recent developments in this field and to provide new viscosity and other data for the designer. Chaptered--Unit Air Conditioners arid Unit Air Coolers. Much of,the text was rewritten to describe present types of units as well as up-to-date practice in their application. Chapter 27--Pipe, Fittings, Welding. New tables were added to indicate the suita bility of various pipe, tube, and fitting materials for different applications. Char acteristics of drainage, waste and vent pipe and tube were discussed in the text and added to the table on dimensions and properties of copper tube. Chapter 28--Pipe and Industrial Insulation. Typical .conductivities of insulating materials were affirmed or revised by the ASHAE Technical Advisory Committee on Insulation. Chapter SO--Central Systems for Air Conditioning. The chapter was enlarged and largely rewritten with new text and diagrams describing year-round systems, unitary systems, high- and low-pressure induction convectors, and both dual duct and fan coil units. V