| Summary: | 碩士 === 國立成功大學 === 建築學系碩博士班 === 94 === In Taiwan, the traditional classroom much is natural ventilation space, and Taiwan located on in pan-tropical zone, the high angle of the sun is greater than the vertex angle of day for a long time. In summer most heat is got through roof ceiling, so classroom spaces of top floor have sultry phenomenon that air does not circulate often. And after 921 earthquakes, the government encourages inclined the pitched roofs design, so consult double layer roof design and related researches, choosing the best double layer roof structural form according to the previous experimental result, being numerical analysis of the actual size classroom by CFD. According to the discussion of the interior air field on different design, we could analyze the benefit of natural ventilation by increasing the outdoor air into the interior. At the meanwhile, we could keep the temperature in a comfortable zone by the air flow. Our goal is “Healthy and Comfortable”. And build up the local reference to provide some advices to future design of interior ventilation.
Purpose
1.Inquire into the benefit of natural ventilation in compared with double layer roof and single layer roof.
2.Inquire into the influence of roof ridge and window opening method on the indoor air field.
3.Construct Inspectional form for the influence of the indoor natural ventilation on difference double layer roof design.
Approach
1.The reference data collection and sorting
2.Numerical analysis of the classroom included Double layer roof with CRSO (covered ridge with sidewall openings) by CFD.
3.According to the result of CFD, inquire into the influence degree of natural ventilation benefit by different design.
Result
Closing window appearance study:
1.When the prototype classroom (single layer roof) increased to establish the CRSO (covered ridge with sidewall openings), it increase 0.65 ACH (about 2229%), and reduced 1 degree (reduce 3%).
2.When the prototype classroom (single layer roof) increased to establish the double layer roof with CRSO, it increase 0.75 ACH (about 2555%), and reduced 2.5 degree (reduce 7%).
3.When the single layer roof with CRSO increased to establish the double layer roof with CRSO, it increase 0.1 ACH (about 115%), and reduced 1.5 degrees (reduce 5%).
4.When the roof ridge open, it increase 0.73 ACH (about 1490%), and reduced 1 degree (reduce 3%).
The window opening method study of Double layer roof with CRSO:
(Add the result fruit study)
1.Opening the general window compared to closing the window increase 1.44 ACH (about 290%), and reduces 1.7 degrees (reduce 6%).
2.Opening the high-low window compared to closing the window increase 2.65 ACH (about 440%), and reduces 1.5 degrees (reduce 5%)
3.Opening the high-low window compared to opening the general window increase t 1.21 ACH (about 150%), and the temperature then has no influence more.( increases 1% a little bit).
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