ASHRAE Journal - January 2020 - 26

TECHNICAL FEATURE

FIGURE 3 ADPI for heating, example.

C1
Warm Supply Air
100

C1

1.1 m, 20.9°C

60

0.6 m, 20.7°C
0.1 m, 20.2°C

40

* RP-1546 developed ADPI values for product currently being selected.
* RP-1546 developed ADPI for heating .
* Additional work by researcher Liu showed that it
ashrae.org

JAN UARY 2020

High
Thermal
Stratification

C2

Conclusion

ASHRAE JOURNAL

1.7 m, 21.6°C

80

TE = exhaust air temperature
20
o = average temperature in occupied space.
All the parameters for the calculation
0
0
1
of eT can be easily obtained together with
the measurement of ADPI. Per ASHRAE
Standard 62.1, the air distribution effectiveness for all mixing systems at heating
mode is no less than 0.8. The heating mode ADPI requires
a designer/practitioner to avoid possible low temperature
effectiveness, typically smaller than 0.8.
In summary, the ADPI calculation at heating mode is
more complex than cooling mode because of possibly
elevated thermal stratification and poor air distribution effectiveness. Besides the criteria of effective draft
temperature and limit of air speed, the heating ADPI
needs also to consider vertical air temperature difference
between 4 in (0.1 m) and 43 in (1.1 m) of a test position
and temperature effectiveness as an indicator of air distribution effectiveness specified in ASHRAE Standard 62.1.
The results showed that too low of a discharge velocity
can result in heating conditioned air stratifying at the
ceiling level with the resulting ventilation effectiveness
as low as 0.3 (Figure 3). Novoselac presented the seminar
"Air Distribution and Ventilation Effectiveness with AllAir Heating Systems," at the ASHRAE 2016 conference in
St. Louis, which details the results of this study.

26

2.3 m, 25.7°C
C2

ADPI (%)

Overall Air Change Effectiveness (E [-])

FIGURE 2 The correlation of temperature effectiveness
and overall air change effectiveness.
1.4
1.3
1.2
1.1
0.9
0.8
0.7
0.6
R2 = 0.8
0.5
0.4
0.3
0.2
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4
Temperature Effectiveness (eT [-])

2.3 m, 23.7°C
Round Ceiling Diffuser

2
T50 /L

1.7 m, 23.9°C

3

Warm Supply
Air

1.1 m, 23.7°C
0.6 m, 23.2°C

Low
Thermal
Stratification

0.1 m, 22.5°C

is critical to select outlets with high enough discharge
velocities in heating to obtain Ev at or above 0.8.
* Additional research to investigate overhead heating
and Ev is recommended.

References

1. Houghten, F.C., C.P. Yaglou. 1923. "Determining lines of
equal comfort and determination of the comfort zone." ASHVE
Transactions, 30.
2. Houghten, F.C., C.P. Yaglou. 1924. "Cooling effect on human
beings produced by various air velocities." ASHVE Transactions, 30.
3. Rydberg, J., P. Norback. 1949. Air distribution and draft."
ASHVE Transactions 55:225.
4. Koestel, A., G.L. Tuve. 1955. "Performance and evaluation of
room air distribution systems." ASHAE Transactions 61:533.
5. Miller, P.L., R.G. Nevins. 1972. "An analysis of the performance
of room air distribution systems." ASHRAE Transactions 78(2):191.
6. Liu, S., A. Novoselac. 2015. "Air Diffusion Performance Index
(ADPI) of diffusers for heating mode." Building and Environment
87:215-223.
7. ANSI/ASHRAE Standard 55-2017, Thermal Environmental
Conditions for Human Occupancy.
8. ANSI/ASHRAE Standard 129-1997(RA 2002), Measuring air change
effectiveness.
9. ANSI/ASHRAE Standard 62.1-2016, Ventilation for Acceptable
Indoor Air Quality.
10. Amai, H., A. Novoselac. 2016. "Experimental study on air
change effectiveness in mixing ventilation." Building and Environment
109:101-111.
11. Amai, H., Liu, S., A. Novoselac. 2017. "Experimental study on
air change effectiveness: Improving air distribution with all-air
heating systems." Building and Environment 125: 515-527.


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ASHRAE Journal - January 2020

Table of Contents for the Digital Edition of ASHRAE Journal - January 2020

Contents
ASHRAE Journal - January 2020 - Cover1
ASHRAE Journal - January 2020 - Cover2
ASHRAE Journal - January 2020 - Cover2a
ASHRAE Journal - January 2020 - Cover2b
ASHRAE Journal - January 2020 - Cover2c
ASHRAE Journal - January 2020 - 2
ASHRAE Journal - January 2020 - Contents
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