Rehva guidebook



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Table 2 Summary of standards and guidelines of thermal comfort.







STANDARD

SEASON

REFERENCE

SETPOINTS FOR OPERATIVE ROOM TEMPERATURE

CONSTRAINT

COMFORT CLASSES

I

II

III

static comfort approach

DIN 1946-2:1994-01 (former guideline, substituted by DIN 13779)

S

e





non





W






DIN 13779:2004-09

no (comparable) comfort evaluation.

ISO 7730:2003-10

S

clo-value



clo < 0.5


±1 K

±1.5 K

±2.5 K

W



clo > 1.0

±1 K

±2 K

±3 K

VDI 4706-1:2009 (draft)

S











±1 K

±2 K

±3 K

W











adaptive comfort approach

ISSO-74


S











±2.5 

±3.5 

±4.2 

W








±1.25 K

±2.0 K

±2.5 K

ASHRAE 55


e,month

o,c = 17,8°C + 0,31∙e,month





2.5 K

3.5 K

-

DIN EN 15251:2007-08


running mean ambient air temperature e,rm

o,c = 18,8°C + 0,33∙e,rm





2 K

3 K

4 K

Reference value for thermal comfort throughout the comfort model is

Guidelines and standards differ by the value of ambient air temperature:

  • hourly ambient air temperature e

  • average ambient air temperature over the last three days e ,rm,2.4

  • monthly mean of ambient air temperature

  • running mean ambint air temperature Mittel der Außentemperatur e ,rm

  • monthly mean ambient air temperature Außentemperatur e,m

  • seasonal ambient air temperature e Sommer/Winter.

  • insulation level of clothing (clo-value)

Figure 4 Thermal comfort footprint: Exceedance of both (top), upper (middle) and lower (bottom) comfort boundaries during the time of occupancy in summer for the buildings allocated to the proposed building categories. The adaptive comfort approach according EN 15251:2007-08 is used for the buildings with passive, air-based mechanical, water-based mechanical and mixed-mode cooling. The PMV comfort approach is considered for the two buildings with air-conditioning.



DKa / JPt rev. 01/02/2017 /
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