Passive solar design using an unvented trombe wall and summer shading A Trombe wall is a sun-facing wall built from material that can act as a thermal mass (such as stone, concrete, adobe or water tanks), combined with an air space, insulated glazing and vents to form a large solar thermal collector. Image File history File links No higher resolution available. ...
Image File history File links No higher resolution available. ...
A brick wall A wall is a usually solid structure that defines and sometimes protects an area. ...
Thermal mass, in the most general sense, is any mass that absorbs and holds heat. ...
The rocky side of a mountain creek near OrosÃ, Costa Rica. ...
Concrete being poured, raked and vibrated into place in residential construction in Toronto, Ontario, Canada. ...
Renewal of the surface coating of an adobe wall in Chamisal, New Mexico Adobe is a natural building material composed of sand, sandy clay and straw or other organic materials, which is shaped into bricks using wooden frames and dried in the sun. ...
Insulated Glazing Unit or Insulating Glass Unit (commonly referred to as IGU) is described as two or more lites of glass spaced apart and hermetically sealed to form a single glazed unit with an air space between each lite. ...
A Solar thermal collector absorbs sunlight to provide heat. ...
Edward Morse patented the design in 1881 (US Patent 246626), but it was ignored until 1964. In the 1960s the design was popularized following the construction of a passive solar house using the principle in Odeillo, France, by the engineer Felix Trombe and architect Jacques Michel. The 1960s decade refers to the years from January 1, 1960 to December 31, 1969, inclusive. ...
Passive solar building design involves the modeling, selection and use of appropriate passive solar technologies to maintain the building environment at a desired temperature range (usually based around human thermal comfort) throughout the suns daily and annual cycles. ...
Font-Romeu-Odeillo-Via is a commune of the Pyrénées-Orientales département, in southwestern France. ...
Felix Trombe (b. ...
The Trombe wall concept
The idea popularized in the 1960s was just the glazed, heavy wall. During the day, sunlight would shine through the insulated glazing and warm the surface of the thermal mass. At night, heat would escape from the thermal mass, primarily to the outside. Because of the insulating glazing, the average temperature of the thermal mass can be significantly above the average outdoor temperature. If the glazing insulates well enough, and outdoor temperatures are not too low, the average temperature of the thermal mass will be significantly higher than room temperature, and heat will flow into the house interior. Prism splitting light High Resolution Solar Spectrum Sunlight in the broad sense is the total spectrum of the electromagnetic radiation given off by the Sun. ...
Insulated Glazing Unit or Insulating Glass Unit (commonly referred to as IGU) is described as two or more lites of glass spaced apart and hermetically sealed to form a single glazed unit with an air space between each lite. ...
Thermal mass, in the most general sense, is any mass that absorbs and holds heat. ...
In the original design, very little of the received heat ends up in the interior and most is lost to the environment at night, because resistance to heat flow between the collector surface and the interior is the same in both directions.
Current basic design Modern Trombe walls have vents added to the top and bottom of the air gap between the glazing and the thermal mass. Heated air flows via convection into the building interior. The vents have one-way flaps which prevent convection at night, thereby making heat flow strongly directional. This kind of design is an isolated passive thermal collector. By moving the heat away from the collection surface, it greatly reduces thermal losses at night and improves overall heat gain. Generally, the vents to the interior are closed in summer months when heat gain is not wanted. Image File history File links No higher resolution available. ...
Image File history File links No higher resolution available. ...
Image File history File links Rammed_earth. ...
Image File history File links Rammed_earth. ...
Rammed earth walls form part of the entrance building for the Eden Project in Cornwall, England. ...
The University of Utah (also The U or the U of U or the UU) is a public university in Salt Lake City, Utah. ...
There are very few or no other articles that link to this one. ...
Nighttime thermal losses through the thermal mass can still be significant. The modern design can be still further improved by insulating the thermal mass from the collection surface. The insulation greatly reduces nighttime heat losses at the cost of smaller reductions in daytime heat gain.
Common variations Common modifications to the Trombe wall include: - Exhaust vent near the top that is opened to vent to the outside during the summer. Such venting makes the Trombe wall pump fresh air through the house during the day, even if there is no breeze.
- Windows in the trombe wall. This lowers the efficiency but may be done for natural lighting or aesthetic reasons. If the outer glazing has high ultraviolet transmittance and the window in the trombe wall is normal glass this allows efficient use of the ultraviolet light for heating while protecting people and furnishings from ultraviolet radiation when compared to using windows with high ultraviolet transmittance.
- Electric blowers controlled by thermostats, to improve air and heat flow.
- Fixed or movable shades, which can reduce nighttime heat losses.
- Trellises to shade the solar collector during summer months.
- Insulating covering used at night on the glazing surface.
- Tubes, pipes or water tanks as part of a solar hot water system.
- Fish tanks as thermal mass.
- Using a selective surface to increase the absorption of solar radiation by the thermal mass.
In the fields of optics and spectroscopy, transmittance is the fraction of incident light at a specified wavelength that passes through a sample. ...
Note: Ultraviolet is also the name of a 1998 UK television miniseries about vampires. ...
A trellis is a frame-like structure on which vined plants can grow. ...
In solar thermal collectors, a selective surface is chosen based on the ratio of radiation-absorption (alpha) to radiation-emission (epsilon), with a higher ratio meaning better performance. ...
See also The following buildings have been recognised as being of international significance in pioneering the use of modern engineered solar building design: MIT Solar House #1, Massachusetts, USA (HC Hottel, 1939) [1] [1] Boulder House, Colorado, USA (G Löf, 1945)[1] MIT Solar House #2, USA, (HC Hottel, 1947)[1...
The Barra system, developed by Horazio Barra in Italy, is a passive solar building technology. ...
It has been suggested that this article or section be merged with Solar Tower. ...
External links - Trombe Walls -- NREL page extolling Trombe walls, with no reference to heat loss issues.
- Trombe wall efficiency -- explanation of the problem with Trombe walls.
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