Definitions - t

A strut that holds the tail (Vane) to the wind generator frame.

A substance capable of causing birth defects.

A material of low heat conductance used to reduce the flow of heat. For example, the vinyl separating the interior and exterior frames in some metal windows.

The appropriate combination of temperatures, warm or cool, combined with air flow and humidity, which allows one to be comfortable within the confines of a building. This comfort is not usually achieved by the fixed setting of thermostats but through careful design and planning.

Thermal conduction is the transfer of heat (internal energy) by microscopic collisions of particles and movement of electrons within a body. In the building context this action is most often encountered when assessing how well a building can maintain its internal temperature in relation to the external temperature.

In heat transfer analysis, thermal diffusivity is the ratio of thermal conductivity to volumetric heat capacity.

Original Wikipedia entry

Carbon is the chemical element with symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. There are three naturally occurring isotopes, with 12C and 13C being stable, while 14C is radioactive, decaying with a half-life of about 5730 years. Carbon is one of the few elements known since antiquity. The name "carbon" comes from Latin language carbo, coal.

See the full entry on wikipedia

Thermal Performance refers to how well a structure responds to changes in external temperature during the daily and seasonal cycles. Typically this is in relation to the thermal conductivity of materials or the assemblies of materials.

You want a property to maintain a steady comfortable temperature inside whilst incurring as little energy costs as possible; this is often best achieved by first improving the thermal performance of the property by providing high levels of insulation (high R-Value, low U-Value) on all surfaces and adopting passive solar techniques.

•  decreasing the oxygen supply, and,
•  affecting the ecosystem composition.

Also by increasing the temperature of water that is normally cold it can increase the likelihood of water born diseases.

Urban runoff, such as storm water discharged to surface waters from roads and parking lots, can also be a source of elevated water temperatures.

A facility that produces electricity by using a heat engine to power an electric generator. The heat may be supplied by the combustion of coal, oil, natural gas, biomass, or other fuels, including nuclear fission, solar, or geothermal resources.

Global warming is the name given to the theory that there is increase in the average temperature of the Earth surface air and oceans since the mid-20th century and its projected continuation.

The exact mechanism of warming is not precisely understood, although it is strongly suspected that Greenhouse gases are to blame, as increasing concentrations of such gases help trap heat in the atmosphere and so raise mean temperatures.

Wikipedia Entry

Thermosiphon (alt. thermosyphon) refers to a method of passive heat exchange based on natural convection which circulates liquid without the necessity of a mechanical pump. This circulation can either be open-loop, as when liquid in a holding tank is passed in one direction via a heated transfer tube mounted at the bottom of the tank to a distribution point - even one mounted above the originating tank - or it can be a vertical closed-loop circuit with return to the original vessel. Its intended purpose is to simplify the pumping of liquid and/or heat transfer, by avoiding the cost and complexity of a conventional liquid pump.

The ratio of how much faster than the wind speed that the blade tips are moving. Abbreviation TSR.

A cogeneration system in which electric power is produced first. The reject heat from power production is then used to produce useful process heat.

Chemical that causes adverse health effects in domestic water supplies and is toxic to fresh water and marine aquatic life.

A current of warm ocean water that flows from the Gulf of Mexico to the coasts of Europe, providing heat that keeps Europe warmer in winter than regions of North America at the same latitude.

Wastewater that has been subjected to one or more physical, chemical, and biological processes to reduce its potential of being health hazard.

Papers made from sources other than trees; such as flax, eucalyptus, hemp, java, bananas, cotton and more.

Method in which water drips to the soil from perforated tubes or emitters.

A calculation of financial, environmental, and social performance. Often referred to as “profits, planet, and people.” This calculation method contrasts with the traditional business bottom line, which only considers profits.

Trisodium Nitrilotriacetate (NTA) can be found in laundry detergents, stain removers and soap scum removers. Prolonged inhalation may cause respiratory irritation. Ingestion may cause nausea, vomiting, and diarrhea. NTA also causes irritation of skin and eyes. Major US detergent manufacturers voluntarily agreed in 1970 to discontinue the use and manufacture of NTA.

NTA is listed as a possible human carcinogen (IARC 2B) by the International Agency for Research on Cancer. It can disrupt the elimination of metals in wastewater treatment facilities.

A Trombe wall is a very thick, south-facing wall, which is painted black and made of a material that absorbs a lot of heat (such as brick or concrete). A pane of glass or plastic glazing, installed a few inches in front of the wall, helps hold in the heat. The wall heats up slowly during the day. Then as it cools gradually during the night, it gives off its heat inside the building.

A Trombe wall is typically used in passive solar design to help improve energy efficiency of the building.

This article goes into more detail on how to use a Trombe wall and heat your home for free.

A functional classification of species that is based on feeding relationships. The number of steps an organism is from the start of the food chain is a measure of its trophic level. Food chains start at trophic level 1 with primary producers such as plants, move to herbivores at level 2, predators at level 3 and usually finish with carnivores or apex predators at level 4 or 5.

Tropical storms generally form in the eastern portion of tropical oceans and track westward. Hurricanes and typhoons all start out as weak low pressure areas that form over warm tropical waters (e.g., surface water temperature of at least 80 ^oF). Initially winds and cloud formations over the warm tropical waters are minimal. Both intensify with time. Formation of tropical storms also requires a significant Coriolis effect to induce proper spin in the wind formation. As the storm begins to organize itself into a coherent pattern, it will experience increased activity and intensity.

When a storm develops a clearly recognizable pattern, it is referred to as a tropical depression. When wind speeds reach 35 knots (40.3 mph), it is called a tropical storm and is given a name. When wind speed equals or exceeds 74 mph, the storm is called a hurricane. In the western Pacific, a hurricane is referred to as a typhoon. In waters around Australia it is called a cyclone or willy-willy.

Hurricanes intensify when moving over areas of increased water temperatures, and weaken over colder water surfaces. Upper atmosphere wind shear (different wind direction and speeds at different elevations) will frequently prevent or slow intensification of tropical storms by "spreading out" the storm horizontally and preventing the formation of strong updrafts of warm, humid air. Movement over a land-mass will weaken hurricane winds but will result in large-scale rain that can result in serious flooding. When encountering a strong frontal system (such as a polar front) the hurricane will curve and track along the leading edge of the front or become implanted in it.

Satellite infrared imagery can identify surface water temperatures that will cause tropical storm development.

Global warming is the name given to the theory that there is increase in the average temperature of the Earth surface air and oceans since the mid-20th century and its projected continuation.

The exact mechanism of warming is not precisely understood, although it is strongly suspected that Greenhouse gases are to blame, as increasing concentrations of such gases help trap heat in the atmosphere and so raise mean temperatures.

Wikipedia Entry

Development or formation of small mounds of corrosion products on the inside of iron pipe. These tubercules roughen the inside of the pipe, increasing its resistance to water flow.

Global warming is the name given to the theory that there is increase in the average temperature of the Earth surface air and oceans since the mid-20th century and its projected continuation.

The exact mechanism of warming is not precisely understood, although it is strongly suspected that Greenhouse gases are to blame, as increasing concentrations of such gases help trap heat in the atmosphere and so raise mean temperatures.

Wikipedia Entry

The visible transmittance is the fraction of visible light transmitted through a window.

A photovoltaic array tracking system capable of rotating independently about two axes (e.g., vertical and horizontal).