Daylight and Comfort in the Indoor Environment. Myriam Aries - Laurens Zonneveldt

Transcription

1 Daylight and Comfort in the Indoor Environment Myriam Aries - Laurens Zonneveldt

2 Daylight and Comfort Comfort is a pre-requisite for energy efficiency Discomfort leads to extra energy consumption 2

3 Conclusions Boundary between comfort, discomfort, and health is not well defined Comfort is a dynamic state, depending on time and other factors Daylight is important, but comfort cannot be achieved by good lighting only State of mind of the user is often dominant in perception of (dis)comfort 3

4 Daylight comfort assessment Model and assessment scale user organisation Comfort time workspace 4

5 What is comfort? A state of physical ease and freedom from pain or constraint The absence of discomfort Depends on Climate and environment Social aspects and culture Mood/motivation Timing Perception 5

6 Visual comfort Theory Lighting quantities (illuminance and luminance values) Information given by daylight (weather, time of day) Outside view (window) Surroundings Prior experience State of mind (adapted after Vink, 2004) 6

7 Daylight and (dis)comfort Individually determined People are creative with measures and solutions 7

8 Daylight and (dis)comfort Architectural solutions 8

9 Daylight and (dis)comfort Man-made architectural solutions People are creative with measures and solutions 9

10 Comfort in the indoor environment Model user organisation Comfort e.g. time Workspace 10

11 How to assess comfort? Comfort Discomfort Illness Comfort scale Absence of discomfort A state of physical ease and freedom from pain or constraint 11

12 Comfort scale Comfort Inconvenience Discomfort Comfort scale Actual tasks, perception, and performance not limited, slightly more effort Illness 12

13 Comfort scale Comfort Inconvenience Discomfort Comfort scale A situation with clear opportunities for physical disability Illness 13

14 Comfort scale Comfort Inconvenience Discomfort Unhealthy Comfort scale Conditions cause a serious health risk and damage Illness 14

15 Complete scale Comfort Inconvenience Poor task performance Discomfort Unhealthy Comfort scale Physical disability Potential damage Illness 15

16 Ranking comfort Inconvenience Lighting Cooling Comfort Inconvenience 16

17 Ranking comfort Discomfort Lighting Ergonomic Physiological Comfort Discomfort 17

18 Ranking comfort Unhealthy Lighting Psychological Physiological Comfort Unhealthy 18

19 Practical conditions Comfort Inconvenience Discomfort Unhealthy Comfort scale Duration: short Illness Importance: high 19

20 Method comfort assessment Model user organisation Comfort Performance time space 20

21 Method assessment comfort Match between preferences and tasks TNO Office Field Lab: concentration 30 years Modern interior Short stay Concentration Cool color temperature Direct bright lighting 21

22 Method assessment comfort Match between preferences and tasks TNO Office Field Lab: conversation Different ages Informal interior One hour Conversation Warm color temperature Indirect lighting 22

23 Daylight and comfort Comfort cannot be achieved by good lighting only! Indoor air quality Acoustics Ventilation Motivation State of mind TNO Office Field Lab 23

24 Conclusions Boundary between comfort, discomfort, and health is not well defined Comfort is a dynamic state, depending on time and other factors Daylight is important, but comfort cannot be achieved by good lighting only State of mind of the user is often dominant in perception of (dis)comfort 24

25 Thank you