Thermal measuring and testing – Temperature measurement – Mechanical
Patent
1980-11-17
1983-11-15
Goldstein, Herbert
Thermal measuring and testing
Temperature measurement
Mechanical
73204, G01F 168, G01K 1708
Patent
active
044152795
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method and a meter for measuring the quantity of heat abstracted from a circulating flow of liquid by a consumption unit based upon the indirect measurement of the volume flow rate of the liquid, while maintaining a sub heat flow from or to the main heat flow transported by the flow of liquid and measuring the temperature at some points by means of temperature sensors. Such a heat meter may for instance be provided in city-wide heating networks for consumption on small scale by the consumers. In the future, city heating networks will be used in a progressively increasing number of towns and districts in which each house will obtain a connection to a public heating network instead of its own boiler for central heating. From this connection the consumer will obtain the hot water for his home heating system and tap water supply either directly or indirectly by means of a heat exchange.
It has become evident that consumption by individual consumers (and thus total consumption) in such city heating system decreases when the amount of heat consumed by the individual consumer is measured. From the heat quantity meter the consumer will than have an idea of the cost of his heating. For this reason the installation of heat quantity meters for consumption on small scale is considered to be useful.
Existing meters such as, for instance evaporation meters, often have the drawback that they are not accurate enough. With respect to others, such as meters including turbine parts, the initial cost and/or maintenance cost are too high.
SUMMARY OF THE INVENTION
The object of the invention is to provide a method and a heat quantity meter not exhibiting the above mentioned drawbacks among other things by the complete absence of moving parts or measuring flanges in the flowing liquid so that there are no obstructions in the supply and return conduits. This will lead to a considerable decrease in maintainance of the meter.
In accordance with the invention this object is attained in that the volume flow rate of liquid is determined on the basis of the flow rate dependent heat transfer in the boundary layer of the flow of liquid at the location where the sub heat flow leaves or enters. The temperature differential across the boundary layer and the sub heat flow passing through said boundary layer is determined, while measuring at least one absolute temperature of the flow of liquid for correcting the temperature dependency of the material constants of the liquid involved in the determination of the volume flow rate.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be elucidated further with reference to the annexed drawings in which like numerals denote like elements:
FIG. 1a shows a basic sketch of the conduit sections including a thermal shunt connection of the heat quantity meter;
FIG. 1b shows a side elevation of a part of a conduit section having a bar shaped shunt connection according to FIG. 1a fastened thereto by means of an angular junction;
FIG. 1c discloses a diagrammatical view of the heat quantity meter including its temperature measuring points and the imaginary heat resistances R1 to R4, inclusive;
FIG. 1d discloses the relation between the measured volume flow rate and the measured temperatures;
FIG. 2 shows a side elevation of a production embodiment of the heat quantity meter;
FIGS. 3a, b, c, and d show a side elevation of four variants of the junction of the shunt connection to a conduit section; and
FIG. 4 shows a side elevation of a variant of the location of a temperature sensor.
DESCRIPTION OF A PREFERRED EXEMPLARY EMBODIMENT
The operation of the heat quantity meter in accordance with the present invention is based solely on the measurement of a number of temperatures. Use is made of the fact that the heat transfer between the heat carrier or flowing liquid and a body, in which or along which this liquid is transported, is dependent, among other things, on the flow rate of the liquid at the relevant locati
REFERENCES:
patent: 2633747 (1953-04-01), Lindstrom
patent: 4085613 (1978-04-01), Richard
Beuse Robert H. J.
Jansen Jan W.
van Iterson Han R.
Wichern Petrus H. M.
Goldstein Herbert
N.V. Tot Keuring van Elektrotechnische Materialen
LandOfFree
Method and a meter for measuring quantities of heat does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and a meter for measuring quantities of heat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and a meter for measuring quantities of heat will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-157282