ASHRAE Journal - April 2020 - 2

CONTENTS

April 2020

FEATURES

STANDING COLUMNS

Stack Pressure-Created
Airﬂows in Insulation
Envelopes, Part 1: Buildings
By Douglas S. Walkinshaw,
Ph.D., P.Eng.; Raymond H.
Horstman, P.E.

62 HVAC Applications
Evidence Shows Need to
Address Pathogenic Bacteria
In U.S. Drinking Water Systems

Impact of HVLS Fans
On Airplane Hangar Air
Destratiﬁcation
By Christian Taber;
Brandon A. Steele

12

By Daryn Cline; Sarah Ferrari

Design Parameters to Consider

By Nathan Ho, P.E.

26
34

76 Building Sciences
Rain Control: Drained, Barrier
And Mass
By Joseph W. Lstiburek, Ph.D., P.Eng.

Reducing Air Stratiﬁcation

Displacement Ventilation Key to
Lab Renovation
By Michael McDermott

M&V Underlies University
Building's Low Energy Use
By Henry Johnstone, P.E.

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ASHRAE Celebrating 125 Years

54

First Prototype Compressor

2

6

Commentary

Industry News

10 Meetings and Shows

91 People

93 Special Products

94 InfoCenter

95 Classiﬁed Advertising

96 Advertisers Index

APRI L 2020

ashrae.org

ASHRAE JOURNAL

By Lan Chi Nguyen Weekes, P.Eng.

By Andy Pearson, Ph.D., C.Eng.

ENR2 Building

DEPARTMENTS

88 IEQ Applications
ASHRAE's Discussions on
Health and Wellness
90 Refrigeration Applications
Mixed Messages on Mixed
Refrigerants

46

Variable Speed Oil-Free
Magnetic Bearing Centrifugal
Compressors
By Scott Moorhouse; Edward
Rodriguez; Drew Turner

82 Solving Problems
Load Calculations for
Cannabis Grow Facilities
By Mary Kate McGowan,
Associate Editor, News

Materials Research Laboratory

4

68 Engineers Notebook
Optimizing Campus Chilled
Water Connections

8

Letters

92 Products

PUBLICATION DISCLAIMER | ASHRAE has compiled this publication
with care, but ASHRAE has not investigated and ASHRAE
expressly disclaims any duty to investigate any product,
service, process, procedure, design or the like which may
be described herein. The appearance of any technical data,
editorial material or advertisement in this publication does not
constitute endorsement, warranty or guarantee by ASHRAE
of any product, service, process, procedure, design or the like.
ASHRAE does not warrant that the information in this publication
is free of errors and ASHRAE does not necessarily agree with
any statement or opinion in this publication. The entire risk of the
use of any information in this publication and its supplement is
assumed by the user.

VO LU M E 62, N O.4
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ASHRAE Journal - April 2020

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