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heat reservoir

noun, Thermodynamics
a hypothetical body of infinitely large mass capable of absorbing or rejecting unlimited quantities of heat without undergoing appreciable changes in temperature, pressure, or density. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for heat reservoir
  • Economical geothermal heat requires that the heat reservoir be close to the surface.
  • Hot water is piped throughout the plant as part of a recirculating heat reservoir system.
  • The sane bed acts as a large heat reservoir which minimizes the amount of fuel required to reheat the system following shutdown.

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