Thermal measuring and testing – Calorimetry
Patent
1997-03-14
1998-12-08
Bennett, G. Bradley
Thermal measuring and testing
Calorimetry
374147, 7320423, G01K 1706
Patent
active
058480943
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a heat transfer monitoring and/or measuring device, especially a flow indicator and/or flow measuring device for flowing media, with a housing, a heating element and at least one temperature measuring element.
2. Description of Related Art
Initially it was stated that the invention relates to a heat transfer monitoring device and/or a heat transfer measuring device. Heat transfer monitoring device here means an embodiment in which heat transfer is simply monitored, in which therefore the presence or absence of a certain heat transfer is ascertained. Conversely, heat transfer measuring device stands for an embodiment in which heat transfer is measured; therefore an analog measured value corresponding to the heat transfer is obtained which can also be converted into a digitized measured value. In other words, a heat transfer monitoring device delivers a qualitative result "heat transfer present" or "heat transfer absent", while a heat transfer measuring device delivers a quantitative result with reference to heat transfer.
Heat transfer monitoring devices and/or heat transfer measuring devices of the type addressed here and indicated in differentiated form above are used especially for acquisition of heat transport by flowing media. Then they are flow indicators or flow measuring devices, in the sense of the aforementioned differentiation flow indicators corresponding to heat transfer monitoring devices and flow measuring devices to heat transfer measuring devices.
Heat transfer monitoring devices or heat transfer measuring devices as well as flow indicators or flow measuring devices of the type under discussion here operate according to the calorimetric principle. Generally differential temperature measurement is used. A first temperature measuring element measures the actual measurement temperature, the measurement temperature resulting from the heat output of the heating element, the temperature of the flowing medium and the flow-dependent heat transport capacity of the flowing medium. Furthermore generally a second temperature measuring element measures a reference temperature. For the teaching of the invention measurement of the reference temperature is not absolutely essential; it can be omitted for example when the temperature of the flowing medium is known.
It was stated at the start that the subject of the invention includes a heating element and at least one temperature measuring element. Here the heating element can also assume the function of the above explained second temperature measuring element; it is then a heating and temperature measuring element.
In the prior art heat transfer monitoring and/or measuring devices which operate according to the calorimetric principle, especially also flow indicators or flow measuring devices are known in several forms (compare German patent disclosure documents 24 47 617, 26 29 051, 32 13 902, 32 22 046, 37 13 981, 38 11 728, 38 25 059, 39 11 008 and 39 43 437, furthermore not yet published patent application 195 04 496.7). It is common to all known embodiments that they have only relatively low sensitivity and relatively low reaction speed; here reaction speed means the ability to react relatively quickly during rapid changes of temperature and/or flow velocity of the medium and to deliver relatively accurate measured values.
SUMMARY OF THE INVENTION
Consequently, the object of the invention is to devise a heat transfer monitoring and/or measuring device, especially a flow indicator and/or flow measuring device with relatively high sensitivity and relatively high reaction speed.
The heat transfer monitoring and/or measuring device according to the invention, in which the aforementioned object is achieved is characterized first of all and essentially in that the heating element and the temperature measuring element are made in the form of pins. In doing so the heating element, as explained above, can be a heating and temperature measuring element.
The heat transfer monitoring
REFERENCES:
patent: 3400582 (1968-09-01), Warner
patent: 3852570 (1974-12-01), Tyler
patent: 4319483 (1982-03-01), Durham, Jr. et al.
patent: 4618266 (1986-10-01), Feller
patent: 4850717 (1989-07-01), Clark et al.
patent: 4972708 (1990-11-01), Wiegleb et al.
patent: 5108193 (1992-04-01), Furubayashi
patent: 5119674 (1992-06-01), Nielsen
patent: 5428994 (1995-07-01), Wenzel et al.
patent: 5632556 (1997-05-01), Sivyer
Moderne Stromungs-Sensoren Nach Einem Kalorimetrischen Prinzip, R. Lauer, 118 Messen & Prufen Automatisieren 29 (1993) Mar. No. 1/2, Kaufering, Germany pp. 4-7.
A Thermal Mass Flow Monitor For Continuous Emissions Monitoring Systems (CEMS), J.G. Olin, 8131 Advances in Instrumentation and Control, vol. 48 (1993) Part 3, Research Triangle Park, NC, US, pp. 1637-1648, 1651-1653.
Buhl Peter
Geiger Clemens
Reichart Walter
Bennett G. Bradley
i f m Electronic GmbH
Safran David S.
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