Written by Donald P. Gatley,
P.E., Fellow/Life Member ASHRAE,
this ASHRAE Journal article, this article looks at the
state-of-the-art of psychrometrics prior to 1904 when Willis H.
Carrier produced the first chart and then traces the developments from
1904 to 2004.
A SIMPLE TOOL
At first glance a
psychrometric chart appears ominous with its myriad of tiny lines
crisscrossing in every direction. Actually, once understood, this
apparent complexity is readily dismissed and the psych chart can
become a relatively simple and invaluable design tool. (Circa 1950)
Julian R. Fellows, emeritus professor of mechanical engineering,
University of Illinois.
Written by Dr. S.A. Sherif,
this ASHRAE Journal article clearly defines psychrometric properties
and describes several psychrometric processes. Psychrometric
processes presented include Sensible Heating or Cooling,
Humidification (with heating or cooling), Cooling and
Dehumidification, Heating and Dehumidification and Mixing of
Airstreams. Psychrometric analysis examples are provided
including Summer Hot - Humid Mode, Summer Hot - Dry Mode and Winter
Cold - Dry Mode.
A proper knowledge of
psychrometrics is invaluable to any meteorologist, HVAC engineer or
system designer, yet many new engineers have little or no training in
this fundamental discipline. This text provides a complete education
in psychrometrics, in the form of a four-hour learning module that is
comprehensive and easy-to-use. It includes definitions of basic
psychrometric terms, all algorithms required for psychrometric
calculations, conversion factors, and comparative data for ideal gas
calculations and Hyland and Wexler NIST formulations. The algorithms
can also be input into computers or hand-held programmable calculators
to aid engineers in their work. This book is useful to meteorologists,
HVAC engineers or system designers as well as to engineering or design
firms wishing to train employees on how to use psychrometrics in their
work. It functions as both a lifetime reference manual for those new
to the field and as a refresher course for those who use
psychrometrics on a recurring basis.
Updated after a critical
review of over 500 publications on the subject. Includes latest
equations, charts and tables for thermodynamic properties of moist
air. Covers various types of hygrometers and psychrometers with
selection guidelines for different applications.
This 4-color, hardback book
is an easy-to-read, user-friendly manual aimed at HVAC designers
concerned with humidity control. It helps to define the purpose of
a humidity control project,
and provides information on the effects of humidity on mold, mildew,
bacteria, viruses and overall human health and comfort. The text also
discusses how humidity control equipment works and the importance of
managing air pressure in a building. Schools, office buildings,
nursing homes and laboratories are discussed in depth along with other
types of buildings. The book provides checklists to help architects,
owners, contractors and building and HVAC system designers get the job
done quickly and accurately.
