DOOR PROPORTIONS

Post 690 –by Gautam Shah

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1 Geometrie Proportion Portal

2 Door Geometrical Divisions

A door has some fundamental significance, Proportion (of Width vs Height aspects), Size (anthropometrics) and Scale (relative size to things around it). And all these imply different meaning on the exterior and interior faces. The door size, proportion and scale, relate to the architectural schema, fore-space and contours, interior of room, and functional passage requirements.

3 Door Portal 6871718107_ca75c3be89_z

Doors have shutters, gates, frames, portals, surrounds, heads, thresholds, and other architectural adjuncts. These elements affect the form of the door. The doors could be really or perceptively narrow, wide, tall, short, small, large, thin or deep. But proportion is one character that remains consistent in all scales.

18 Chapel Door by Sigurd Lewerentz httpswww.flickr.comphotosseier2340686947

PROPORTIONS

Most common set of proportions (Width : Height) have been: Two squares 1: 2, and Golden proportion 1:1.61. Other shapes include Square (Le Corbusier’s Ronchamp Doors), Horizontal Rectangle (Air hanger’s shutters). Sliding doors have a horizontal rectangle form. For twin shutters, each is of square shape. Multi panelled shutters have to maintain the horizontal bias for ease of movement. The real proportion of a door is seen when the shutter is open. A mid-pivot shutter may divide the opening in equal or unequal gaps. A door opening is more prominent if it is deep-set in the portal, or has contrasting colour+texture from its surround structure.

5 Square Ronchamp door by Le Corbusier httpswww.flickr.comphotosyellowbookltd3648223450

4 Entry Gate to Assembly Building Capitol Complex Chandigarh India Wikipedia Image by Lillottama

The vertical rectangular form makes the opening taller then its width. Small-width doors are technologically more efficient to construct and operate it ergonomically. Such narrow widths reduce the load on the hanging devices such as hinges and so are easy to open. Horizontal sliding doors, for easier movement, need to be wider then their height. Square doors are favourite with designers, but cannot be hung on side-end hinges. A square gap mislays its form when opened on mid or offset pivots. Very wide doors use vertical or horizontal pivots (garage doors) or sliding mechanisms (Japanese doors, Shop Rolling shutters).

Lincon Main Entrance

Historically Door Goal Portal Input Gate

22 Notre Dame Paris Multiple entrances httpswww.flickr.comphotos27398485@N0825558255261

Instead of a wide door, multiple (ganged) doors used at railway station are multiple units in a row. Similar effect occurs for multiple folding or stacking shutters for verandahs. Multiple doors and shutters provide spaced control for simultaneity, location, orientation. Where multiple tracks are not, feasible, shutters are joined together like the bellows of an accordion to form a sliding and folding stack. Folding or collapsible doors were first used in cabinets and cupboards, and diffuse the exchange over a wider zone.

7 Multiple Doors httpspixabay.comendoors-open-series-input-3798125

 

9 Olympic Park Railway Station Ticket Barriers

SIZE

A door is primarily sized for passage of humans, but often designed for mix of purposes. Some doors are exclusively for passage of goods and animals (hoppers, trap or flap doors), and so may not have any size relevance for human passage. Doors are functional elements of optimal size yet economics and technology govern its size and details. The critical aspect of door design is its width aspect. An insufficient width retards the speed, or even makes it difficult or impossible to transit through. But small width enforces discipline on chaotic traffic of entrants. Narrow width openings increase the integrity of the load-bearing structure. A very generous width fails to. Such wide openings need extra dividing barricades to channelize the traffic, or multiple narrower sub-gate systems. Bunker doors must be carefully small sized for increasing resistance to blast pressures.

Médinet-Abou. Porte du Grand Temple (Égypte) _

Door portal size and the size of the shutter, are two different things. Doors of extra ordinarily large sizes or monumental proportions have been used through ages. A large door metaphorically denotes unrestricted transit, grand reception, fearlessness or power, affluence, and dominance. Technologically a door shutter cannot be very large, so doors placed in large portals and with adjunct structures.

18 False Door dawn of civilization Egypt and Chaldaea

As a social concern in modern times, it is essential to provide doors widths suitable for disabled persons, using walking stick, crutch walkers, a wheel chair, stretcher or assisted by others. Widths of doors for, toilet, elevators, closets, store rooms, change rooms, and such other lone user utilities are considered more critical for such users.

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Some famous doors > Treasury of Atreus, Mycenae 9′-0” x 18′-0″, Parthenon, Rome 0′-0″ x 24′-2″, Erechtheion, Athens 8′-0″ x 17′-2″, S. Martin, Worms 5′-8″ x 11′-3″, Palazzo Pietro Massimi, Rome, main entrance door 6′-10″ x 13′-8″, National Archives in Washington, DC, Constitution Avenue bronze doors 37′-7″ x 10′ (and 11″thick), Vehicle Assembly Building VAB of NASA door height 456′.

10 Vehicle Assembly Building VAB of NASA door height 456'

Simple sliding doors allow variable and exact control over the width of opening. Automatic sliding doors such as for elevators and for entrances of public buildings open to width governed by the density and frequency of traffic. Revolving doors have optimum opening size to maintain the air lock and prevent anyone forcing a reverse movement. Folding shutter doors allow incremental width of the opening. Garage doors sliding up were devised to get a maximum width of opening.

11 Shutting-Opening-Pushing a hinged, pivoted or sliding Door if large sized, can be a technological issue

Height of a door is checked for three parameters: the height available within the opening, the height of the door head, and the height of the threshold. The actual passage height of a door is affected by the level of terrain immediately inside and outside the door. Low level doors have been used to reduce the heat gain or loss (e.g. igloos), the storm water (e.g. sea front warehouses in America).

12 Multiple stacked doors for floors of West India Quay Canary Wharf Warehouse served by single pulley lift httpswww.flickr.comphotosell-r-brown6455291621

SCALE

The scale of a door is governed by the architectural scheme, impinging built mass and the surrounding terrain. The scale of a door is also referential. Proportionately a door or gate opening seems smaller, if the adjacent wall or barrier system is very evident. On the same scale a large or multiple openings make barriers less effective. The exchange occurring across a small opening is very intense, compared to a large gateway.

13 Door and Portal Buland Darwaza Fatehpur Sikri India Wikipedia Image by Diego Delso, delso.photo, License CC-BY-SA

14 Adjunct structures Gwalior Fort Entry Gate Wikipedia Image by Divyarthsuryavanshi httpscommons.wikimedia.orgwikiFileGwalior_Fort_Entry_Gate

Adjunct structures enhance the perceived scale and significance of the door. Fort gates and other gateways have not only very large doors but also have elaborate adjunct structures like portals, abutments, ramparts, bulwarks, bastions, Bastille, battlements, belvederes (Chhatri), buttress, campaniles (bell towers). Historically, very large (wide and tall) doors have been a necessity, for functional passage as well as for splendour. Doors are intentionally made smaller, if these are insignificant (backdoor, servant door, supply door), or need to be concealed, such as the secret or escape doors. Mid town gates are designed as multiple (three or five) openings to serve different levels of traffic. Doors are added with side and top lites, pediment, surrounds, free columns or half-pilasters to enhance the scale.

20 Hypostyle Hall of the Hathor Temple at Dendera (XI) httpswww.flickr.comphotosisawnyu8390823916

Egyptian temples had very tall openings, the lower section was shuttered and the upper section was a left over gap, which allowed entry of early morning Sun God Ra. Gothic churches had upper section of the door converted into a Rose window. Very tall doors, unless required for passage, are turned into transom lites. Very tall doors require a visual correction. Romans constructed tall doors with a wider base and narrower top. For very tall doors, the construction of strong shutter and relevant opening control mechanisms have been the greatest deterrent. Tall opening like effects are created with architectural door portals and alcoves where the functional door is very much smaller.

15 Pantheon Entrance Wikipedia Image by daryl_mitchell from Saskatoon, Saskatchewan, Canada

Low level doors have been used to reduce the heat gain or loss (e.g. igloos), the storm water seepage (e.g. sea front warehouses in America). Romans constructed tall doors that were wider at the base than at the top to correct the visual perspective.

16 Lateral stiffening of Dam Gates in Matsumoto city, Nagano prefecture, Japan. Wikipedia Image by Qurren

Large door shutters require lateral stiffening, as the usual thin shutter leaf construction is insufficient against buckling forces such as the wind, blasts, and often sonic boom pressures. Aircraft hangers’ and spaceships’ assembly workshops (Apollo, Columbia, USA) have very large doors with additional lateral framing. Hanger doors are designed to be sliding from top, bottom or both. Similarly dams and canal gates have to resist not only the pressure of retained water but dynamic pressures of waves and eddy currents. Such doors are designed as 3D entities. Stadia and such public spaces where people are likely to push against the gates, extra lateral stability is required.

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ARCHITECTURAL vs COMPUTER WINDOWS

Post 668 by Gautam Shah

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The first independent version of Microsoft Windows, version 1.0, was released on 20 November 1985. It was originally going to be called Interface Manager, but Rowland Hanson, the head of marketing at Microsoft, convinced the company that the name, Windows was more appropriate.

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And this was the beginning of unlimited harassment to all architects (and even lay persons), first from the Encyclopaedias and later by search engines. This happened when a nominal word of day to day use, became almost an exclusive intellectual property. Many of the Microsoft ‘windows’ features were already tried out by Apple computers.

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The ‘Windows’ was (or ‘were’, no grammar Nazis have raised the issue) was an opening to look into data. There was earlier a nearly invisible dot as the command ‘prompt’ to interact in dBase and other programme, and it never prompted anything except that the entered command is not right.

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Windows 3

But here the ‘computer industry’ (Microsoft, Macintosh or some less known entity) was offering an Icon like a door within a door. The icons or windows were displayed as tiled on the screen, that is, they could not overlap or overlie another, but icons interacted with others in time and space. There were active and latent icons in terms of time reference. ‘Spatially the icons on a screen were more relevant then others that were not seen’. The icons were perceived to be windows or peep holes that allowed one to see through it.

BackSlash-Linux-Anna

For many, the icons are still like the 36th Chamber of Shaolin. One is aware that there is something of higher order inside, but too scared to cross over. The unceasing efforts are to form 36th chamber where ordinary people can enter and learn the “art of self-defense.

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In the movie 36th Chamber of Shaolin, “San Te wants to create a new chamber where he can train ordinary people in the basics of Kung fu so they can defend themselves against their oppressors, the temple officially banishes him in a surreptitious way to allow him to carry out his mission. He returns to the outside world, namely to his hometown, and assists the people.”

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This was a view in a window (like a shop front display), but, it was destined to become (with internet) an architectural entity for viewing out, whatever is happening in the world. The earlier version of Windows was little better than dBase like programmes where the software creator and user both were instilled with unspecified fear ‘do not push a wrong key’. The user was perceived to be an alien, and better remain outside.

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The computers gradually became Janus’s gateway (Janus -a dual headed God of antiquity) with an interior world and an exterior cosmos. This was a virtual window or rather an entire building of its own, which could be shifted around, pushed away to obscurity, shrunk or enlarged.

Statue_of_Janus_傑纳士像_-_panoramio

Some of the basic functions of a computer system have been storage, processing power and programmes. Now one more is added, the communication or linkage. With live linkage one can source storage (cloud), computing power (parallel server processing) and dynamic programmes (in place of static loads). These make for a ‘home’ out of an architectural ‘house’, where the opening systems (‘windows’ or any other) make connections. So Microsoft windows may need to be renamed “Doors”, as doors are more functional (for passage, delivery and dispatch) than any other openings’ systems.

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The smart ‘Home’ (computer or such devices) will need lot more individualization not through configuration efforts but through commonly shared (floating around) intelligence. These include the languages, intonation, choices, history of preferences, behavioural characteristics, biological patterns and capacities.

Multi-level ghorfas, as seen at Ksar Ouled Soltane in southern Tunisia..

MANIFESTATIONS of DOOR

Post 663 –by Gautam Shah

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Sequence of Doors Temple of Ramses III

A gap, portal or doorway, door-frame and the shutter, have an individual as well as combinative presence. Presence of one or many in physical, hyper-real or allegorical sense manifests the opening system.

Big Data Internet Virtual Reality Future

Door symbolism: A symbolic door is a representation of the nominal door or its important components or essential qualities. Door symbols are abstracted as well as scaled versions. Metaphors are also used to present the physical characteristics, crucial functions, essential qualities and historical associations of the doors. Doors denote a break and so the symbolic presentations are used to indicate the breach-able points or weak spots. In electrical circuit diagrams and pipe layout drawings the door symbols are used to denote a break, open-position or a switch. In communication field a door stands for connectivity with the world so a ‘gateway’ is where traffic converges and redistributes.

space vehicle assembly area

A physical door requires a real gap and a real shutter. The shutters open, close or take up many intermediate positions. Physical doors, however have abstract adornments or attachments that give a deceptive character to the door and belie their reality.

Nara Narayana panel on the eastern wall of the Vishnu temple

A nonphysical door may not have an opening to transit, though the portals distinctively mark the place of opening. A nonphysical door could be unreal or metaphoric. Communication gateways are such doors.

Technology Antenna Radio Satellite Communication

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Notional doors: Over the years, in our minds, a shutter has become so strongly associated as the door that its presence or even notional indication suffices for the opening to be evident. ‘A shutter like configuration, over a barrier satisfies our expectation that there is a way out or in.’ The notional or representational doors, such as the painted doors on Egyptian tomb walls do not take one anywhere, but do satisfy the spiritual needs as an entryway to the other world. Such doors, drawn or carved are of real-functional size as well as of debased scale.

This blind door at Banteay Srei is flanked by colonettes.

A pseudo door exists with inadequate or no opening system. The door has no real gap for transit, no perceptible doorway, or there is inadequate shutter system. The prehensions for a door are at many levels including: functional, perception, size and scale. Such doors also exist without any apparent barrier system.

Invisible Gate that trigger a Door

Louvre the interior of the the door, places monuments.

A virtual door does not reveal itself physically, but otherwise it is functionally as effective. Modern industrial plants, estates and institutional campuses have ‘open’ gaps or invisible doors with control systems that activate a ‘shutter’ (a control system) when required. Few make-believe door frames or markers are placed to indicate the position and presence of such monitoring devices. Metal detectors’ door frames at airports and public spaces, colour coded markings on the floors, are examples of these.

Many invisible security gate features -Gatehouses to the Deep Water Harbour Wikipedia Image by CaribDigita

Make-believe doors are created to denote an entrance or boundary of an ethereal world. Stage side-wings become exit-entry points. An actor, to enact a departure from the realm, at a certain point on the stage, ceases to act or shows the backside of the body. Door frames standing in a wide terrain or the gate structure such as the Japanese Torii gates standing in wide stretch of water is an entrance.

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Heritage Symbol Great Torii Of Miyajima Boundary

Metaphoric doors: Metaphoric doors manifest through signs and symbols. Such doors may not have a functional size, scale and other physical characteristics or functional utility of a nominal door.

Ent to mountain shrine

These allegorical forms are used to mark and enhance the essence of a door:

  •       variations in barriers (representing an overlap or a gap or aperture),
  •       a scaled or functionally sized gap,
  •       a passageway (indicating a pathway to or from somewhere),
  •       signs, symbols and graphics to mark linearity (a lead to some place),
  •       frames (to enclose a view and other sensual perceptions),
  •       miniature or micro-cosm frames around the deity.
  •     mythological associations with doors or openings such as: Janus -Roman, Re -Egyptian, Ganesha, Dwarpal or Kshetrapal (the Indian keepers of the gate or estate), Shen Tu and Yu Lei (Chinese guardians -two brothers of the passageway).

Symbolic Door Chinatown San Francisco gateway arch 2010 California Wikipedia Image by chensiyuan

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DEPTH of OPENINGS

Post 636 –by Gautam Shah

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Woman_sitting_in_a_window

We are more concerned with the width and height of openings. Width and Height are primarily functional derivative, and secondarily a matter of proportioning. The proportioning works intrinsically with width versus height, but more importantly with the schema of the building. The schema also takes of aura or grandeur of the openings like doors, gates, etc. Over-engagement with width and height of the opening can be reduced by use of surrogate like shadows (Sciography from Greek σκιά ‘shadow’). This technique creates a metaphoric depth of very high contrasts. In this the contrast is between black and white (or presence and absence of certain colour).  Such contrasts are difficult to fully visualize in scale models, as the subduing effects of reflections from surroundings or floors, or counter balancing by internal illumination.

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The openings gain a third dimension due to the shadows, and shadows occur due to differences in depths. But depth of a door or window regulates the field of view and amount of illumination. It governs the changes occurring in transit through the opening. These include disciplining the passage of goods and people. Depth forms an intervening space and time for mechanisms like filtration, funneling, release, mixing, direction, etc. of air and illumination.

Two_doors_of_the_tomb_(inside)The depth of an opening derives from the structures like walls, partitions, domes, etc. but in few cases it is achieved through architectural manipulation. External walls of the buildings, till about the Gothic period, were heavy offering two choices for showing the depth on the external face or internal side. Both of these were done in several ways. A chamferred edge on outside, enlarges the size of the opening, view of outside worlds, net illumination gain for the interior and weather protection. A chamferred edge on inside cut the glare, diffused the illumination, reduced the wall surface requiring mural or other treatments.

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Gothic buildings’ thinner walls, however, did not allow such a play. So instead the Windows were elaborately segmented. The mullions, muntins and traceries did not divide the story line running through. Gothic glass unlike modern glass was opaque so did not allow interiors to be visible, but during daytime the segments and colours both compensated lack of wall murals and mosaics (of an earlier era). The third dimension of the opening was completely eliminated with glass curtain wall buildings. Mies van der Rohe was yet criticized for using very emphatic mullions.

8714804380_857c6eb75a_z(1)The Depth of openings enhanced the dual character of inside and outside. The architectural depths of the openings are, however, changed by bevelled edges, chamferred sides, introduction of pilasters, intrados, extrados, sloped sills and opening heads. A bottom taper brings the light to the floor, and a sloped interior head illuminates the ceiling.

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One of the most fascinating aspects of openings is the threshold. It may be informal, just a marked significance by small change of elevation, colour or texture. The greater depth of the opening bestows a formal change of a domain, due to marked elevation, changes of treatments and side treatments like seating place, alcoves and chambers. A threshold has two distinct worlds on either of the sides, one or both of which could be real or notional. Such elaborated depths of the door elements become resting zones, zone for transition, point of decision making, celebration, welcome or separation.

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BLOG LINKS on OPENINGS SYSTEMS

Post 633 –by Gautam Shah

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ANTI-LIGATURE https://interiordesignassist.wordpress.com/2014/04/04/anti-ligature/

LOCKS https://interiordesignassist.wordpress.com/2014/08/15/locks/

ANTI LIGATURE > https://interiordesignassist.wordpress.com/2016/06/28/anti-ligature-issues-for-design-8/

SAFETY ASPECTS of DESIGN > https://interiordesignassist.wordpress.com/2016/04/15/safety-aspects-of-design/

ALMIRAH-1 > https://interiordesignassist.wordpress.com/2015/09/11/almirah-1/

STORAGE CABINETS > https://interiordesignassist.wordpress.com/2015/08/11/storage-cabinets/

DOORS-SECONDARY HARDWARE > http://talking-interior-design.blogspot.in/2016/02/doors-secondary-hardware-latches-stays.html

DOORS – BASIC HARDWARE > http://talking-interior-design.blogspot.in/2016/01/door-basic-hardware.html

ANCIENT DOORS > http://talking-interior-design.blogspot.in/2014/05/ancient-doors.html

DOOR HINGES > https://interiordesignassist.wordpress.com/2015/03/03/door-hinges/

SLIDING DOORS > https://interiordesignassist.wordpress.com/2015/02/02/sliding-doors/

 WIDE DOORS and MULTIPLE DOORS > https://interiordesignassist.wordpress.com/2014/09/06/wide-doors-and-multiple-doors/

REACH in SPACE > https://interiordesignassist.wordpress.com/2015/10/18/reach-in-space/

MEANING of a WINDOW SILL > https://interiordesignassist.wordpress.com/2015/12/24/meaning-of-a-window-sill/

SHOP WINDOWS > https://interiordesignassist.wordpress.com/2015/12/12/shop-windows/

EVOLVING ARCHITECTURAL WINDOWS > https://interiordesignassist.wordpress.com/2015/02/04/evolving-architectural-windows/

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CLASSICAL WINDOW FORMS > https://interiordesignassist.wordpress.com/2015/01/27/classical-window-forms/

WITCH WINDOW > https://interiordesignassist.wordpress.com/2014/09/16/witch-window/

WINDOW TAX > https://interiordesignassist.wordpress.com/2014/08/08/window-tax/

MASKING of OPENINGS Part -III -Framing https://interiordesignassist.wordpress.com/2016/01/25/masking-of-opening-part-iii-framing/

MASKING of OPENINGS Part -II https://interiordesignassist.wordpress.com/2015/09/23/masking-of-openings-part-ii/

 MASKING of OPENINGS Part -I https://interiordesignassist.wordpress.com/2015/08/30/masking-of-openings-part-I/

 

FRAMING of OPENINGS https://interiordesignassist.wordpress.com/2015/08/04/framing-of-openings/

 

ARCHITECTURAL WINDOWS and VISION in-out

https://interiordesignassist.wordpress.com/2014/11/17/architectural-windows-and-vision-in-out/

 

ARCHITECTURAL WINDOWS and the MEANING

https://interiordesignassist.wordpress.com/2014/11/16/architectural-windows-and-the-meaning/

 

FRAMING of OPENINGS > https://interiordesignassist.wordpress.com/2015/08/04/framing-of-openings/

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DAYTIME INTERIOR ILLUMINATION -REALITY and PERCEPTION > https://interiordesignassist.wordpress.com/2015/07/30/daytime-interior-illumination-reality-and-perception/

 

LANTERNS in ARCHITECTURE > https://interiordesignassist.wordpress.com/2015/06/10/lanterns-in-architecture/

 

LEGENDS of OPENINGS-1 > https://interiordesignassist.wordpress.com/2015/06/04/legends-of-openings-1/

 

NATURE of OPENINGS > https://interiordesignassist.wordpress.com/2015/04/12/nature-of-openings/

 

OPENINGS in COLONIAL PERIOD of INDIA > https://interiordesignassist.wordpress.com/2015/03/24/openings-in-colonial-period-of-india/

 

ARCHITECTURAL WINDOWS and MECHANICS of VISION https://interiordesignassist.wordpress.com/2014/11/18/architectural-windows-and-mechanics-of-vision/

 

GLASS and PERCEPTION https://interiordesignassist.wordpress.com/2014/08/31/glass-and-perception/

 

LEVEL of OPENINGS https://interiordesignassist.wordpress.com/2014/06/07/level-of-openings/

 

DESIGNING OPENINGS https://interiordesignassist.wordpress.com/2014/05/17/designing-openings/

 

CLASSICAL WINDOW FORMS https://interiordesignassist.wordpress.com/2015/01/27/classical-window-forms/

 

GLASS IN WINDOWS Part-II

https://interiordesignassist.wordpress.com/2014/10/02/glass-in-windows-part-%e2%80%a2-ii/

 

GLASS IN WINDOWS Part-I

https://interiordesignassist.wordpress.com/2014/09/28/glass-in-windows-part-%e2%80%a2-I/

 

CONTRAST EFFECT PERCEPTION

https://interiordesignassist.wordpress.com/2014/08/25/contrast-effect-perception/

 

THIRD DIMENSION of OPENINGS

https://interiordesignassist.wordpress.com/2014/04/10/third-dimension-of-openings/

 

SKY LIGHTS https://interiordesignassist.wordpress.com/2016/07/15/sky-lights/

 

ARCHITECTURAL OPENINGS in LITERATURE > https://interiordesignassist.wordpress.com/2016/05/29/architectural-openings-in-literature/

 

DESIGN CONSIDERATIONS for DAY-LIGHTING > https://interiordesignassist.wordpress.com/2016/03/24/design-considerations-for-daylighting/

 

CLERESTORY OPENINGS > https://interiordesignassist.wordpress.com/2014/09/01/clerestory-openings/

 

CLASSES of OPENINGS > https://interiordesignassist.wordpress.com/2014/08/18/classes-of-openings/

 

STRUCTURES over DOORS > https://interiordesignassist.wordpress.com/2014/08/07/structures-over-doors/

 

OTHER TYPES of DOORS > https://interiordesignassist.wordpress.com/2014/07/19/other-types-of-doors/

 

SIZE of a DOOR > https://interiordesignassist.wordpress.com/2014/07/14/size-of-a-door/

 

JALOUSIE > https://interiordesignassist.wordpress.com/2014/06/29/jalousie/

LEVEL of OPENINGS > https://interiordesignassist.wordpress.com/2014/06/07/level-of-openings/

 

INTERIOR ILLUMINATION through DOORS > https://interiordesignassist.wordpress.com/2014/05/21/interior-illumination-through-doors/

 

DESIGNING OPENINGS > https://interiordesignassist.wordpress.com/2014/05/17/designing-openings/

 

MULLION > https://interiordesignassist.wordpress.com/2014/04/09/mullion/

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LINKS for MECHANICS of VISION

Post 619 –by Gautam Shah

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MASKING of OPENINGS Part -III -Framing
https://interiordesignassist.wordpress.com/2016/01/25/masking-of-opening-part-iii-framing/

MASKING of OPENINGS Part -II
https://interiordesignassist.wordpress.com/2015/09/23/masking-of-openings-part-ii/

MASKING of OPENINGS Part -I
https://interiordesignassist.wordpress.com/2015/08/30/masking-of-openings-part-I/

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FRAMING of OPENINGS
https://interiordesignassist.wordpress.com/2015/08/04/framing-of-openings/

ARCHITECTURAL WINDOWS and VISION in-out
https://interiordesignassist.wordpress.com/2014/11/17/architectural-windows-and-vision-in-out/

ARCHITECTURAL WINDOWS and the MEANING
https://interiordesignassist.wordpress.com/2014/11/16/architectural-windows-and-the-meaning/

ARCHITECTURAL WINDOWS and MECHANICS of VISION https://interiordesignassist.wordpress.com/2014/11/18/architectural-windows-and-mechanics-of-vision/

GLASS and PERCEPTION

https://interiordesignassist.wordpress.com/2014/08/31/glass-and-perception/

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DESIGN CONSIDERATIONS for DAYLIGHTING

Post 593 by Gautam Shah

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Daylighting is illuminating the interiors of built spaces with the sunlight, as available during the sun up period. This is controlled entry of natural light and diffuse skylight into a building to reduce electric lighting and saving energy. The ‘direct’ daylight arrives through openings like doors, windows, skylights and other gaps. Indirect daylight is brought in as Diffused sky light from surface reflectors or Transmitted light through tubes and other devices.

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Haveli Courtyard, Near begum Samru’s palace > Flickr image by Varun Shiv Kapur

Daylighting depends on the external conditions, such as the season of the year, climate, dust, fog or cloud cover, time of the day, terrain or surroundings. Daylight can be designed through buildings, size (spread or massing, depth, floor heights), form or shape, orientation, scheduling and location of tasks, configurations of openings, etc. It is closely linked to saving energy used for lighting during daytime. Daylight is substantially dependent on openings like doors and windows, and this help creates stimulating and natural environment.

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Chhatrapati Shivaji International Airport Mumbai Departure area > Wikipedia image by Nancy Beaton

Daylighting is dependent on external conditions. The season of the year determines not only the ‘sunshine’ days and brightness, but the direction (solar inclination) of the light. The climatic conditions govern if fenestrations can be kept fully open or closed. Local atmospheric conditions like dust, fog, cloud cover and pollution affect the intensity of daylight. Activities must be scheduled according to the diurnal cycle and positioned as per the available exposure. The surroundings’ factors, such as the terrain slopes, colour (of white sand beach fronts, green lawns or foliage, water bodies), and reflective capacities determine the brightness level of illumination.

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Sahara Town Ghadames Libya > Wikipedia image by Luca Galuzzi http://www.galuzzi.it

Daylighting and building design, have mutual dependence. The exposure of the face, surface area, perimeter and form of the buildings can be advantageously exploited for better gain of daylight.

Daylighting for energy saving must be conceived with a view to reduce the artificial illumination requirements of deep-set spaces, low height spaces, isolated interior entities like vestibules and corridors. A synergetic system to calibrate the electric illumination can be created for task-need and occupancy of the space, compensative distribution (elimination of glare-contrasts) and low heat output.

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High sill windows Abbaye d’Acey Jura France > Wikipedia image by Arnaud 25

Fenestrations and Daylighting are linked. Fenestration location (wall, skylights), height, shape and construction affect the daylighting. Fenestrations also serve the purpose of comfort (ventilation requirements such as heat gain-loss, air-moisture control, interior pollutant dilution, air movements) and view in-out, so must incorporate these requirements.

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Daylight used for illuminating interior spaces, exploits the ever-changing quality in terms of intensity, colour and direction of the light. The daylight-design, scatters the light over a wider extent, diffuses its intensity and subdues the strong directionality, alters the colour quality, and shifts the location of the source.

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Screening for daylight and view Wikipedia image by Margaret Bourke-White

Light intensity is a function of season, orientation and fenestration design. These are important considerations for siting an activity. Light intensity is perceived against the brightness level of the background scene or the surfaces. It can also be altered by illumination from other directions or additional artificial sources.

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Tony Rich Training Centre Uni of Essex Consistent illumination by skylight and support by electric light> Wikipedia image by Rwendland

Colour of the daylight as reflected sky component have small colour variations, except the occasional colour scattering at sun rise and set periods. Daylight received from reflected surfaces such as terrain, near by buildings and plants has a colour tinge. The colour of the glazing material, colour of the opening cover systems like Venetian blinds, curtains, overlay films, etc. side-surfaces of fenestration systems.

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Colours of the surroundings > Flickr image by Darron Birgenheier

Direction of the light is an important consideration for ingress or avoidance direct sunlight. North light (South light in S-hemisphere), are designed to access best natural illumination for industrial plants. East side facing openings allow ‘cool’ brightness in comparison to West faces.

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Darker surface does not equalize the light > Pixabay image

Scattering the light over a wider area achieves equal brightness by avoiding high-low contrast or patchy areas. This is done by multiple openings or by masking the opening with diffuser screens. Scattering is avoided where dramatic effects are intentionally created such as vestibules, entrance halls, etc. Equalization of illumination in space is also achieved by electronic sensors that activate electric illumination in required intensity.

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Taliesin West drafting studio illumination > Wikipedia image by Steven C. Price

Diffusing the intensity of light is resorted to reduce the high level of brightness on summer or clear sky afternoon periods. This is done by automatic masking devices or by baffles or louvers with apertures attuned to non-bright exposure-directions and schedules. Diffusers are also used to reduce the level of brightness in areas that act as transition spaces to darker environments such as auditoriums.

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Strong light source and contrast > Pixabay image (of woman by window)

Calibrating a strong sense directionality with illumination is necessary to reduce the dynamism of direct natural illumination. Architectural openings like doors and windows bring in variations of brightness (movement of clouds), shadows of moving objects (trees, vehicles, other traffic), and variations of colours into the interior spaces. This changeability is often an irritant for work areas like laboratories, libraries, bedrooms, etc. By sourcing the daylight from multiple directions, the illumination can be made static and multilateral.

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Contrast reduced by additional illumination from side openings >Window at the East end of Choir in Month of Feb, Wells Cathedral Somerset > Wikipedia image by IDS.photos from Tiverton, UK

Altering the colour quality where colour perception is important such as in surgical and pathological areas of hospitals, colour and dye manufacturing plants, film and media editing rooms. Here not only the colour must be neutral but consistent. This is achieved by avoiding light reflected from external sources, such as pavings, walls and lawn or green foliage.

Shift the location of the source is important for space planning design at micro level. The available natural source may have strong left or right, up or down delineation and may need the shift of illumination location. This is done by external and internal reflecting surfaces or use of light transmission tubes.

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