Editing Passive solar building design (section)

==As a science==
The [[scientific]] basis for passive solar building design has been developed from a combination of [[climatology]], [[thermodynamics]] (particularly [[heat transfer]]: [[conduction (heat)]], [[convection]], and [[electromagnetic radiation]]), [[fluid mechanics]]/[[natural convection]] (passive movement of air and water without the use of electricity, fans or pumps), and human [[thermal comfort]] based on [[heat index]], [[psychrometrics]] and [[enthalpy]] control for buildings to be inhabited by humans or animals, [[sunroom]]s, solariums, and [[greenhouse]]s for raising plants.

Specific attention is divided into: the site, location and solar orientation of the building, local [[sun path]], the prevailing level of [[insolation]] ([[latitude]]/sunshine/clouds/[[precipitation (meteorology)|precipitation]]), design and construction quality/materials, placement/size/type of windows and walls, and incorporation of solar-energy-storing [[thermal mass]] with [[heat capacity]].[[Image:Illust passive solar d1.gif|thumb|upright=1.5|right|Elements of passive solar design, shown in a direct gain application]]While these considerations may be directed toward any building, achieving an ideal optimized cost/performance solution requires careful, [[holistic]], [[system integration]] [[engineering]] of these scientific principles. [[History of passive solar building design|Modern refinements]] through computer modeling (such as the comprehensive U.S. Department of Energy "Energy Plus"<ref>{{cite web | title = U.S. Department of Energy – Energy Efficiency and Renewable Energy – Energy Plus Energy Simulation Software | url = http://apps1.eere.energy.gov/buildings/energyplus/ | access-date = 2011-03-27 | archive-date = 2011-02-05 | archive-url = https://web.archive.org/web/20110205015437/http://apps1.eere.energy.gov/buildings/energyplus/ | url-status = dead }}</ref> [[building energy simulation]] software), and application of decades of lessons learned (since the [[1970s energy crisis]]) can achieve significant energy savings and reduction of environmental damage, without sacrificing functionality or aesthetics.<ref name="fs110">{{cite web
 | url = http://www.yourhome.gov.au/technical/fs15.html
 | title = Rating tools
 | access-date = 2011-11-03
 | archive-url = https://web.archive.org/web/20070930015551/http://www.greenhouse.gov.au/yourhome/technical/fs110.htm
 | archive-date = September 30, 2007
}}</ref> In fact, passive-solar design features such as a greenhouse/sunroom/solarium can greatly enhance the livability, daylight, views, and value of a home, at a low cost per unit of space.

Much has been learned about passive solar building design since the 1970s energy crisis. Many unscientific, intuition-based expensive construction experiments have attempted and failed to achieve [[zero energy building|zero energy]] – the total elimination of heating-and-cooling energy bills.

Passive solar building construction may not be difficult or expensive (using off-the-shelf existing materials and technology), but the scientific passive solar building design is a non-trivial engineering effort that requires significant study of previous counter-intuitive lessons learned, and time to enter, evaluate, and iteratively refine the [[building energy simulation|simulation]] input and output.

One of the most useful post-construction evaluation tools has been the use of [[thermography]] using digital [[Thermographic camera|thermal imaging cameras]] for a formal quantitative scientific [[energy audit]]. Thermal imaging can be used to document areas of poor thermal performance such as the negative thermal impact of roof-angled glass or a skylight on a cold winter night or hot summer day.

The scientific lessons learned over the last three decades have been captured in sophisticated comprehensive [[building energy simulation]] computer software systems (like U.S. DOE Energy Plus).

Scientific passive solar building design with quantitative [[cost benefit]] [[product optimization]] is not easy for a novice. The level of complexity has resulted in ongoing bad-architecture, and many intuition-based, unscientific construction experiments that disappoint their designers and waste a significant portion of their construction budget on inappropriate ideas.<ref name=":1">{{Cite web|url=http://occ.governee.cere.net/2013/08/passive-solar-design-in-architecture-new-trend/|title=Passive Solar Design in Architecture – New Trend?|last=Talamon|first=Attila|date=7 Aug 2013|website=Governee}}</ref>

The economic motivation for scientific design and engineering is significant. If it had been applied comprehensively to new building construction beginning in 1980 (based on 1970s lessons learned), The United States could be saving over $250,000,000 per year on expensive energy and related pollution today.<ref name=":1" />

Since 1979, Passive Solar Building Design has been a critical element of achieving [[zero energy building|zero energy]] by educational institution experiments, and governments around the world, including the U.S. Department of Energy, and the energy research scientists that they have supported for decades. The [[cost effective]] [[proof of concept]] was established decades ago, but [[cultural change]] in architecture, the construction trades, and building-owner [[decision making]] has been very slow and difficult.<ref name=":1" />

The new subjects such as ''architectural science'' and ''architectural technology'' are being added to some schools of architecture, with a future goal of teaching the above scientific and energy-engineering principles.{{Citation needed|date=March 2011}}