# Definitions for thermal reservoirther·mal reser·voir

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1. Thermal reservoir

A thermal reservoir, also thermal energy reservoir or thermal bath, is a thermodynamic system with a heat capacity so large that the temperature of the reservoir changes relatively little when a much more significant amount of heat is added or extracted. As a conceptual simplification, it effectively functions as an infinite pool of thermal energy at a given, constant temperature. Since it can act as a source and sink of heat, it is often also referred to as a heat reservoir or heat bath. Lakes, oceans and rivers often serve as thermal reservoirs in geophysical processes, such as the weather. In atmospheric science, large air masses in the atmosphere often function as thermal reservoirs. Since the temperature of a thermal reservoir T does not change during the heat transfer, the change of entropy in the reservoir is d S R e s = δ Q T {\displaystyle dS_{Res}={\frac {\delta Q}{T}}} .The microcanonical partition sum Z ( E ) {\displaystyle Z(E)} of a heat bath of temperature T has the property Z ( E + Δ E ) = Z ( E ) e Δ E / k B T , {\displaystyle Z(E+\Delta E)=Z(E)e^{\Delta E/k_{B}T},} where k B {\displaystyle k_{B}} is the Boltzmann constant. It thus changes by the same factor when a given amount of energy is added. The exponential factor in this expression can be identified with the reciprocal of the Boltzmann factor. For an engineering application, see geothermal heat pump.

### WikidataRate this definition:3.0 / 4 votes

1. Thermal reservoir

A thermal reservoir, a short-form of thermal energy reservoir, or thermal bath is a thermodynamic system with a heat capacity that is large enough that when it is in thermal contact with another system of interest or its environment, its temperature remains effectively constant. It is an effectively infinite pool of thermal energy at a given, constant temperature. The temperature of the reservoir does not change irrespective of whether heat is added or extracted. As it can act as a source and sink of heat it is often also referred to a heat reservoir or heat bath. Lakes, oceans and rivers often serve as thermal reservoirs in geophysical processes, such as the weather. In atmospheric science, large air masses in the atmosphere often function as thermal reservoirs.

### Numerology

1. Chaldean Numerology

The numerical value of thermal reservoir in Chaldean Numerology is: 3

2. Pythagorean Numerology

The numerical value of thermal reservoir in Pythagorean Numerology is: 8

## Translations for thermal reservoir

### From our Multilingual Translation Dictionary

• خزان حراري
• reservoir termal
• تھرمل ذخائر

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"thermal reservoir." Definitions.net. STANDS4 LLC, 2024. Web. 7 Sep. 2024. <https://www.definitions.net/definition/thermal+reservoir>.

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