To overcome this issue a typology of architecture has been selected; the library.

Because of its particular function libraries have a very peculiar relation with the daylight. They require both a functional light and aestethic light. Functional light have to be both very high to allow the readers to read and very dim to protect the books that are stored in the library. Aesthetic light must celebrate the function of “storage of culture” and at the same time “exposer of culture”, that library contains in its definition.

The way of approaching the daylight in libraries has known numerous design solution throughout the years. The architectural panorama is vast, and hence the selection of cases study takes count to represent all the mains configurations. This imply libraries that seeks the light from the top, libraries that seeks the light from the sides, and the mix of this one. The cases study are situated in different locations at different latitudes. This choice allow to understand which is the influence of latitude in the daylighting desing.

Talking about daylight means firstly talking about feelings, humans perceptions and human health. Therefore the first part of this thesis will be dedicated to these issues. In which way the daylight is connected with the concept of comfort and how this creates requirements, that a well studied lighting design must take in consideration.

Secondly the concept of climate will be taken in review in order to better understand what will constitute the main tool of this thesis.

In fact, the daylighting analyses that will support the architectural design analyes will be based on a set contemporary powerful tools that bring information both in terms of quantity of daylight and both in terms of quality .The most innovative tool is the climate-based-approach. This predict in a statistical approach the daylighting behavirour of an architecture throughout an year. This type of approach will be passed in review and will be compared to the other approaches that allow to understand the quantity of light in a space.

The quantitative analyses will be matched to the qualitative analyses of the solar path in order to have a complete view of the problem of daylight.

One time collected all of these datas, the libraries will be analysed singularly in a first moment and compared altogether in a second moment.

This approach will allow to understand the relation between every analysed architectural configurations and the daylighting behaviours of that specific design.

In which manner the daylight can be used in libraries to emphazised its functions and which are the paths that a conscious daylight design could follow.

1.3 The concept of comfort

2. CLIMATE

2.1 Climate fundamentals

2.2 The variability of daylight

2.3 The luminance distribution of sky

3. COLLECTING DAYLIGHT

3.1 From the sky to the desk features buildings that characterized the quality of daylight

3.2 The concept of transmittance

3.3 Glazing transmittance

4. LIBRARIES AND DAYLIGHT

4.1 The basis of a conscious X lighting design in libraries

5. ANALYSING DAYLIGHT

5.1 Daylight factor

5.2 Advantages and limits of the daylight factor approach

5.3 The basis of the climate-based daylighting approach

5.4 Dynamic daylight metrics

5.5 Metrics comparison

5.6 Simulating daylight

SECOND PART: LIBRARIES

6. SIMULATION PROGRAMS

6.1 How to construct a 3D model

6.2 Working with daysim

SELECTED LIBRARIES:

7.VIIPURI LIBRARY

7.1 The library QG

7.2 A pure diffuse light

7.3 Simulation’s results

7.4 Daysim analysis

7.5 Solar path analysis

7.6 Conclusions

8. ROVANIEMI PUBLIC LIBRARY

8.1 Daylight factor

8.2 Stealing light from the North

8.3 An example of perimetral light

8.4 Simulation’s results

MAIN READING ROOM

8.5 Daysim analysis

8.6 Solar path analysis

8.7 Conclusions

PRESS ROOM

8.8 Daysim analysis

8.9 Solar path analysis

8.10 Conclusions

9. PHILLIPS EXETER LIBRARY

9.1 The library

9.2 The lighting carrels

9.3 Simulation’s results

9.4 Daysim analysis

9.6 Conclusions

10. KANAZAWA UMIMIRAI LIBRARY, Kanazawa JAPAN

10.1 The library

10.2 Light through nature

10.3 Simulation’s results

10.4 Daysim analysis

10.5 Solar path analysis

10.6 Conclusions

11. LIYUAN LIBRARY, Beijing CHINA

11.1 The library

11.2 Thousands of punctual lights

11.3 Simulation’s results

11.4 Daysim analysis

11.5 Solar path analysis

11.6 Conclusions

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SITES:

-http://climate-based-davliahtina.com

-http://apps1 .eere.enerav.aov/buildings/eneravplus/weatherdata_about.cfm?CFID=1321787&CFTOKEN=7e-699f93ad1695b5-8668A109-E935-5D67-C86AA3313495B038&fsessionid=566F10021D1CDC3D7C55DD-DE2862D68E.eere