In the course of a study on the behaviour of coupled heat-pipes, perfect agreement has been obtained for the first time between measurements on the immersion characteristics in a mercury heat-pipe and the Clausius- Clapeyron profile. This result opens the perspective of using coupled heat- pipes to relate thermodynamically two different temperature ranges, with the possibility of redefining one temperature range in terms of another. As a consequence, using sodium for the second heat-pipe, the very high reproducibility of standard platinum resistance thermometers(SPRTs) below 400 °C can be transferred to the temperature range above 660 °C, surpassing the characteristics of high-temperature platinum resistance thermometers (HTSPRTs).
Towards new temperature standards for contact thermometry above 6600C
2002
Abstract
In the course of a study on the behaviour of coupled heat-pipes, perfect agreement has been obtained for the first time between measurements on the immersion characteristics in a mercury heat-pipe and the Clausius- Clapeyron profile. This result opens the perspective of using coupled heat- pipes to relate thermodynamically two different temperature ranges, with the possibility of redefining one temperature range in terms of another. As a consequence, using sodium for the second heat-pipe, the very high reproducibility of standard platinum resistance thermometers(SPRTs) below 400 °C can be transferred to the temperature range above 660 °C, surpassing the characteristics of high-temperature platinum resistance thermometers (HTSPRTs).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
