water-flow pyrheliometer

water-flow pyrheliometer

[′wȯd·ər ¦flō ¦pir‚hē·lē′äm·əd·ər]
(engineering)
An absolute pyrheliometer, in which the radiation-sensing element is a blackened, water calorimeter; it consists of a cylinder, blackened on the interior, and surrounded by a special chamber through which water flows at a constant rate; the temperatures of the incoming and outgoing water, which are monitored continuously by thermometers, are used to compute the intensity of the radiation.
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