Heating Ventilating Air Conditioning Guide 1939 valve.

Heating Ventilating Air Conditioning Guide 1939 975 hours represent a third of the summer period, cooling equipm. based upon the noon average J uly wet-bulb of 68 F would be inadecmJ^ Commercial practice is to choose a wet-bulb temperature for refrigeratj design purposes which is not exceeded during more than 5 to 8 per cpn< of the summer hours (75 F for New York City), with somewhat lowe requirements for steam turbines and internal combustion engines.

Heating Ventilating Air Conditioning Guide 1939 7 Why do cooling towers give best results when the humidity of the air is i01f.

Heating Ventilating Air Conditioning Guide 1939 Where a number of rooms are to be heated and ventilated through one central fan system it is customary to provide tempering heating units, automatically controlled to provide a minimum temperature for venti lation only and additional heating units to supply the heating require ments.

Heating Ventilating Air Conditioning Guide 1939 HORIZONTAL SUPPLY MAINS The horizontal mains supplying the risers at the top of a down-feed' system must be liberally sized unless the house tank is set at a much higher elevation than usual.

Heating.

RICHARDSON!

tl ) Air Hygiene Foundation of America, Inc., 4400 Fifth Avenue, Pittsburgh, Pa.

Confidential Mellon Institute of Industrial Research University of Pittsburgh PROGRESS REPORT for the weekended Marsh 11. 1939 AIR KTCIZIiZ RCUID-TIONIndustrial Fellowship No.

242 CHAPTER 12 s *T954!

1930 CHAPTER 40 1956 Guide winding.'

2S8 Twenty-third Annual Safety Camjrcss--National Safety Couucil atmosphere firr 14 t 15 h< <nrs. during which ihcy arc thoroughly dried.

INDUSTRIAL Published by the Illinois Manufacture 120 S.

-39- VI.

326 29lh .Votional Safety Congress cm ifcjintrd out that comprritensive jolt aialj'< have oiten been made &< a method of establishing equitable wage rales: Ixn an men more important devrlopuwm of (lior ftwiw if the study of job Itaxard*.