Thermal measuring and testing – Calorimetry – Gain or loss of heat by heat utilizing load in path of heat...
Patent
1996-07-02
1999-05-11
Gutierrez, Diego
Thermal measuring and testing
Calorimetry
Gain or loss of heat by heat utilizing load in path of heat...
374 33, 374 1, G01K17/08;19/00
Patent
active
059020431
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention concerns heat metering, and in particular the invention concerns a method of measuring heat power consumed in a region from heat delivered thereto by a heat containing fluid and also concerns a heat meter to measure the heat power consumed in the region from heat delivered thereto by the fluid.
2. Discussion of the Background
The fluid may be a liquid, for example water. For example, in the case of water, the water may be the output from a heater such as a boiler, or be coolant bearing heat from apparatus it has been used to cool, or may be condensed steam, for example condensate subsequent to using the steam to drive a turbine.
The region comprises one or more heat exchangers. The region may be of any size. For example, the region may have single heat exchanger, for example a space heating radiator in a room. Or the region may comprise a plurality of heat exchangers forming, for example, a heat providing system for, for example a dwelling, a factory, a commercial office or public building, or a public amenity, or a plurality or combination of any of the aforesaid forming, for example, a community, village, town, suburb, district, or a commercial or industrial zone or district.
SUMMARY OF THE INVENTION
According to a first aspect of the invention, there is provided a method of measuring heat power consumed in a region from heat delivered thereto by a heat containing fluid passing along an input path to said region from which the fluid leaves along an output path from said region, the method comprising measuring a temperature difference value Dd between the temperature of the fluid at a first position in one of said paths and the temperature of the fluid at a second position in the other of said paths, adding heat of a heat power value Ph to the fluid at a location in a said path, said location being with respect to the direction of fluid flow in said paths and region downstream of one of said positions and upstream of the other of said positions, measuring a temperature difference value Dh between the temperature of the fluid adjacent to upstream and downstream extremities of said location which temperature difference Dh is a consequence of adding heat power of said value Ph to the fluid at said location, and calculating the heat power of a value Pd consumed by said region according to the expression: ##EQU1## According to a second aspect of the invention, there is provided a heat meter to measure heat consumed in a region from heat delivered thereto by a heat containing fluid, said heat meter comprising a first or input path for passage of fluid therealong into said region when the region is connected to said input path, a second or output path for passage therealong of the fluid leaving said region when the region is connected to said output path, temperature difference observing means to observe a temperature difference value Dd between the temperature of the fluid at a first position in one of said paths and the temperature of the fluid at a second position in the other of said paths, heat adding means to add heat of a heat power value Ph to fluid in a said path at a location which, with respect to the direction of fluid flow in said paths and region when the paths are connected to the region, is downstream of one of said positions and upstream of the other of said positions, temperature difference observing means to observe a temperature difference value Dh between the temperature of the fluid adjacent to upstream and downstream extremities of said location and which temperature difference Dh is a consequence of adding heat power of said value Ph to the fluid at said location when the heat meter is in use, and calculating means to calculate the heat power Pd consumed by said region according to the expression: ##EQU2## Heat power of the value Ph may be added to the fluid in one of said paths at a location which may be upstream or downstream of the region; i.e. the heat power of value Ph may be added to the fluid, either before th
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English Language Translation of German Unexamined Application No. 2,330,498 published Jan. 9, 1975.
Price Barry Leonard
Roberts Graham Richard
Wightman David Richard
British Gas plc
Gutierrez Diego
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