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Questions and Answers
What is the maximum allowed floor temperature in winter according to the additional requirement n° 4?
What is the maximum allowed floor temperature in winter according to the additional requirement n° 4?
10°C
In case of cool/warm wall risk, what is the maximum allowed plane radiant temperature asymmetry in summer?
In case of cool/warm wall risk, what is the maximum allowed plane radiant temperature asymmetry in summer?
23°C
What is the category with a PPD % of less than 6% and a radiant asymmetry of less than 5%?
What is the category with a PPD % of less than 6% and a radiant asymmetry of less than 5%?
A
What is the maximum allowed high radiant temperature asymmetry in winter according to the additional requirement n° 4?
What is the maximum allowed high radiant temperature asymmetry in winter according to the additional requirement n° 4?
What is the local discomfort factor related to air temperature?
What is the local discomfort factor related to air temperature?
What is the category with a PPD % of less than 15% and a radiant asymmetry of less than 10%?
What is the category with a PPD % of less than 15% and a radiant asymmetry of less than 10%?
What is the maximum allowed high vertical air temperature difference in winter according to the additional requirement n° 4?
What is the maximum allowed high vertical air temperature difference in winter according to the additional requirement n° 4?
What is the significance of 35°C in the context of indoor environmental quality?
What is the significance of 35°C in the context of indoor environmental quality?
What is the purpose of the additional requirement n° 4?
What is the purpose of the additional requirement n° 4?
What is the category with a PPD % of less than 10% and a radiant asymmetry of less than 5%?
What is the category with a PPD % of less than 10% and a radiant asymmetry of less than 5%?
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Study Notes
Local Discomfort
- High vertical air temperature difference, floor temperature, draught, and high radiant temperature asymmetry are types of local discomfort.
Additional Requirement 1: Vertical Air Temperature Difference
- The vertical air temperature difference between head and ankles should be:
- 3°C for category B
- 2.1°C for category A
- Categories and corresponding PPD% and PD (vertical Dt) are:
- A: < 6% and < 3%
- B: < 10% and < 5%
- C: < 15% and < 10%
Additional Requirement 2: Floor Temperature
- The floor temperature should be between 19°C and 26°C.
- Specific temperatures are:
- 20°C in winter
- 26°C in summer
- Categories and corresponding PPD% and PD (floor temp.) are:
- A: < 6% and < 10%
- B: < 10% and < 10%
- C: < 15% and < 15%
Additional Requirement 3: Draught Rate
- The Draught Rate depends on:
- Air temperature
- Mean air velocity
- Turbulence intensity
- Categories and corresponding PPD% and PD (DR) are:
- A: < 6% and < 15%
- B: < 10% and < 20%
- C: < 15% and < 25%
- UNI 10339 Standard requires:
- va,max,winter ≤ 0.15 m/s
- va,max,summer ≤ 0.25 m/s
Additional Requirement 4: Radiant Temperature Asymmetry
- The plane radiant temperature asymmetry should be less than:
- 10°C in winter
- 23°C in summer
- Categories and corresponding PPD% and PD (Radiant asymmetry) are:
- A: < 6% and < 5%
- B: < 10% and < 5%
- C: < 15% and < 10%
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