ASHRAE Journal - July 2019 - 19

TECHNICAL FEATURE

FIGURE 5 Nurses PMV for slightly warm, neutral, and slightly cool operative temperatures, under a combination of

metabolic rates and clothing insulation levels (basic uniform 0.57 clo, add vest = 0.93 clo).

PMV

10
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
-0.8
-0.9
-1

20

Air Speed (fpm)
30

40

50

Toperative = 23.5°C (74°F), 2.0 met, 0.57 clo
Toperative = 23.5°C (74°F), 1.8 met, 0.57 clo
Toperative = 21.5°C (71°F), 2.0 met, 0.57 clo
Toperative = 21.5°C (71°F), 1.8 met, 0.57 clo
Toperative = 20.5°C (69°F), 1.6 met, 0.93 clo
Toperative = 20.5°C (69°F), 1.4 met, 0.93 clo
Toperative = 20.5°C (69°F), 1.6 met, 0.57 clo
Toperative = 20.5°C (69°F), 1.4 met, 0.57 clo

0.05

0.10

0.15
Air Speed (m/s)

0.20

0.25

FIGURE 6 Nurses PMV for slightly warm, neutral, and slightly cool operative temperatures, under a combination of
metabolic rates and clothing insulation levels (basic uniform 0.50 clo, add vest = 0.86 clo).

Air Speed (fpm)

PMV

10

20

30

40

50

1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
-0.8
-0.9
-1

Toperative = 23.5°C (74°F), 2.0 met, 0.50 clo
Toperative = 23.5°C (74°F), 1.8 met, 0.50 clo
Toperative = 21.5°C (71°F), 2.0 met, 0.50 clo
Toperative = 21.5°C (71°F), 1.8 met, 0.50 clo
Toperative = 20.5°C (69°F), 1.6 met, 0.86 clo
Toperative = 20.5°C (69°F), 1.4 met, 0.86 clo
Toperative = 20.5°C (69°F), 1.6 met, 0.50 clo
Toperative = 20.5°C (69°F), 1.4 met, 0.50 clo

0.05

References

0.10

0.15
Air Speed (m/s)

0.20

1. ASHRAE. 2013. HVAC Design Manual for
Hospitals and Clinics. Second edition. Atlanta:
ASHRAE.
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