English Glossary

Since 02.06.2017

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on a tilted surface

tamper proof valve

A valve which is lockable or requires a special key to open to prevent operation by mistake


Generally a duty or tax on imports (charged/ levied based on a percentage of cost or specific amount per unit), but can also mean charge/payment for a service as in 'feed-in-tariff'.

tariff degression

Automatic (annual or monthly) reduction of feed-in tariff payment levels in order to anticipate technology improvements.


transmission Code 2007


total cost of ownership


transparent conductive oxide

temperature gauge

A device that gives a visual indication of the temperature in a system

temperature sensor

A device that senses the temperature in a system

temperature sensor pocket

A pocket or sleeve installed in the fluid flow of a system into which the temperature sensor is inserted


In loan finance, the number of years a loan is outstanding (i.e., the final maturity or term).

term sheet

A non-binding agreement setting forth the basic terms and conditions under which an investment will be made. A term sheet serves as a template to develop more detailed legal documents. Once the parties involved reach an agreement on the details, a binding agreement or contract is drawn up.

terminal voltage

Voltage level at the connection terminal of a certain electrical unit to the power system

tertiary control

Third grid control mechanism that has to be available within 15 minutes. It involves a manual or automatic change in the dispatching of power, e.g. changing power output of certain generators participating in secondary control. It is also known as tertiary frequency control, tertiary reserve is also known as minute reserve.

tertiary reserve

Reserve available after 15 min. (Syn. minute reserve)

thermal bridges

Area of an object (frequently a building) which has a significantly higher heat transfer than the surrounding materials, resulting in an overall reduction in the thermal insulation of the object or building.

thermal insulation

Material or construction that reduces the transfer of heat from one objects to another or to the outside environment.

thermal oil

Thermal oil is the most commonly used heat transfer fluid in parabolic trough CSP arrays. Its composition is 26.5% biphenyl, 73.5% diphenyl oxide. It operates in the temperature range 12-392C. It is non-corrosive but it is toxic.


(bio.) Thermophilic digestion process is an anaerobic digestion which takes place optimally around 50°C-52°C but also at elevated temperatures of up to 70°C, where thermophiles are the primary micro-organisms (bacteria) present.

thermosiphon system

A heating system in which the fluid circulates by natural convection due to the different densities of the fluid at different temperatures

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