ASHRAE Journal - April 2021 - 2

CONTENTS

April 2021

FEATURES

STANDING COLUMNS

Virus Transmission Modes and
Mitigation Strategies, Part 2:
Airborne Transmission and
Distribution
By Jonathan Burkett, P.E.

10

Airborne Transmission & Distribution

Increasing Efﬁciency By Using
Four-Pipe Water Source
Heat Pumps
By Nabil Nassif, Ph.D., P.E.

24
38

Mobile Modular

Technology Award
Medical Ofﬁce Building
Thrives With Advanced Control
Sequences
By Reece Kiriu, P.E.;
Jeff Stein, P.E.

62

High-Performance Controls

DEPARTMENTS
4 Commentary

2

6 Industry News

69 Special Products

69 Products

71 Classiﬁed Advertisers

72 Advertisers Index

APRI L 2021

ashrae.org

Interviews by Mary Kate McGowan

32 Engineer's Notebook
How U.N. Sustainable
Development Goals Apply to
HVAC Engineers
By Erin McConahey, P.E.

Using Four-Pipe WSHPs

Using a Mobile Modular Energy
Unit With PV Panels for Heating
By Raimonds Bogdanovics;
Anatolijs Borodinecs; Jurgis
Zemitis; Aleksandrs Zajacs

18 Solving Problems
Exploring Challenges in
Existing Building Automation
Systems

ASHRAE JOURNAL

8 Meetings and Shows
70 InfoCenter

48 Building Sciences
A Good Insulation Always
Knows Its Limitations
By Joseph W. Lstiburek, Ph.D., P.Eng.

56 IEQ Applications
Reviewing How Bedroom
Ventilation Affects IAQ And
Sleep Quality
By Mizuho Akimoto;
Chandra Sekhar, Ph.D.; Mariya
P. Bivolarova, Ph.D.; Chenxi Liao;
Xiaojun Fan; Jelle Laverge, Ph.D.
Li Lan, Ph.D.; Pawel Wargocki, Ph.D.

68 Refrigeration Applications
The Art of Not Constructing
By Andy Pearson, Ph.D., C.Eng.
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ASHRAE Journal - April 2021

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