Term
| the ideal building from a shading point of view prioritizes what? |
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Definition
| north and south fenestration only |
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Term
| Tier 1: Basic Building Design |
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Definition
shading
thermal comfort + heat avoidance |
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Term
| two kinds of exterior shading devices |
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Definition
1. fixed shading device
2. movable device |
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Term
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Definition
| building design is simplified; take note of different shading strategies for different orientations |
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Term
| from a shading point of view, _____________ windows are best avoided |
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Definition
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Term
| shading is improved when a combination of ________ and ________ elements is used |
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Definition
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Term
| shading response to overheating period |
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Definition
| any fixed shading device that is designed to fully shade until the end of the overheated period will also shade the window at the end of the underheated period, when full sun exposure is still needed. |
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Term
| solar year vs. thermal year |
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Definition
larger upper bar: annual climate
smaller lower bar: time period when a fixed shading device fully shades a window |
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Term
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Definition
| by far the best because it allows much more winter sun to enter (windows become energy assets rather than energy liabilities) |
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Term
| why exterior shading is preferred to interior shading |
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Definition
| because they are much more effective in keeping the sun out |
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Term
| envelope dominated (residences, etc.) |
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Definition
| low internal heat gain; yes to use of passive solar heating except in very hot climates |
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Term
| internally dominated (large office, etc) |
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Definition
| high internal heat gain; no to use of passive solar heating except in very cold climates |
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Term
overheated if avg. daily outdoor temp is greater than 60oF
underheated if avg. daily outdoor temp is under 50oF |
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Definition
| internally dominated (thresholds are lower) |
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Term
overheated if avg. daily outdoor temp is greater than 70oF
underheated if avg. daily outdoor temp is under 60oF
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Definition
| envelope dominated (thresholds are higher) |
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Term
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Definition
| vent hot air and minimize show and wind loads; smaller scale appearance is often desirable |
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Term
| shading is the main concern, not passive heating |
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Definition
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Term
| both shading and passive heating are the concern |
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Definition
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Term
| a fixed overhang designed to shade a window during the whole overheated period will also shade part of the windowd during the underheated period |
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Definition
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Term
| what determines the maximum allowable projection of an overhang during the winter period? |
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Definition
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Term
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Definition
| 90% of the incident solar radiation (transmitted and reradiated components) ends up as heat gain |
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Term
| glazing: tinted/heat-absorbing |
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Definition
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Term
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Definition
| 50% heat gain (effectively blocks solar radiation without color distortion) |
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Term
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Definition
| skylights (horizontal glazing) should usually be avoided because they face the summer sun; clerestory windows should be used instead because they allow the sun to enter in a controlled manner |
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