AMCA InMotion - September 2019 - 19

FIGURE 6. Side view of the experimental setup in
the wind tunnel.

Outside pressure test

Compressed air coming in

Exhaust fan

θ

Inside pressure test

of 0 degrees and 20 degrees provided good protection

for 8 min before the spaces are sealed and loss differ-

against 787-fpm (4 m/s) wind, which was consistent with

ences are measured.

the large-scale-chamber test results (Figure 7).

■

Static environmental chamber-in what is intended to

The study found the worst wind attack angle to be

be a simplified version of the dynamic-environmental-

0 degrees. Increasing wind angle did not affect air-curtain

chamber procedure, hot and cold spaces separated by

performance until an angle of 90 degrees was reached. When

an air curtain are exposed for only a minute and there
is no attempt to maintain temperature.

a person was in the doorway either directly under or in
front of the air curtain, air-curtain performance generally

■

Aerodynamic infiltration model-based on a study
completed in November 2018,9 it relates the aerodynamic-

improved, as the person blocked flow from both directions.

performance test methods in ANSI/AMCA Standard 220

Next Steps

and ISO 27327-1:2009, Fans-Air Curtain Units-Part 1:

What faces the air-curtain industry next is preparation

Laboratory Methods of Testing for Aerodynamic Performance

for regulation. Similar to the fan industry, the air-curtain

Rating, to an air curtain's ability to reduce infiltration/

industry has been faced with regulatory challenges, at

exfiltration rates.

times as serious as potential elimination from the market.

In 2019, ISO was expected to publish a technical paper

Such was the case in the United States in 2015, when the

on the dynamic-environmental-chamber method citing

DOE was investigating regulating fans and included air

Z

curtains in the scope, or in Europe before 2011, when

Y

X

a research project8 utilizing dynamic climate chambers
9.5

provided a methodology and test data proving air curtains

8.5
80

When regulatory bodies have a need to consider airefficiency. An air curtain should be rated based on its

Z (min)

curtain performance, they have a tendency to look at

energy consumption) compared with the energy loss that

0

Since 2015, International Organization for Standardization (ISO) has been evaluating test methodologies. Three
have been proposed:
■

Dynamic environmental chamber-maintenance of hot
and cold spaces separated by an air curtain is attempted

w w w. a m c a .o r g

4.5
3.5

20

it converts electrical power to airflow.

5.5

40

application or effectiveness in reducing infiltration (and
would be experienced without an air curtain, not how well

7.5
6.5

60

2.5
1.5
150
100

Y(

mi

100

n) 50

50
0

X (m

i n)

0

FIGURE 7. Three-dimensional flow streamlines of
1,969-fpm (10 m/s), 60-degree-angle wind against
1,890-fpm (9.6 m/s) discharge velocity and
0-degree discharge angle.

20 19 A M CA i n m o t i o n

19

0.5

m/s

reduce energy loss.


http://www.amca.org

AMCA InMotion - September 2019

Table of Contents for the Digital Edition of AMCA InMotion - September 2019

Contents
AMCA InMotion - September 2019 - BB1
AMCA InMotion - September 2019 - BB2
AMCA InMotion - September 2019 - Cover1
AMCA InMotion - September 2019 - Cover2
AMCA InMotion - September 2019 - Contents
AMCA InMotion - September 2019 - 2
AMCA InMotion - September 2019 - 3
AMCA InMotion - September 2019 - 4
AMCA InMotion - September 2019 - 5
AMCA InMotion - September 2019 - 6
AMCA InMotion - September 2019 - 7
AMCA InMotion - September 2019 - 8
AMCA InMotion - September 2019 - 9
AMCA InMotion - September 2019 - 10
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AMCA InMotion - September 2019 - 16
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AMCA InMotion - September 2019 - 18
AMCA InMotion - September 2019 - 19
AMCA InMotion - September 2019 - 20
AMCA InMotion - September 2019 - 21
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AMCA InMotion - September 2019 - Cover3
AMCA InMotion - September 2019 - Cover4
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