Rehva guidebook

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

• 
  the operative room temperature as hourly value _o,c
  

• 
  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.