Determining the heat flow emanating from a heat transporting fluid
AssigneeBelimo Holding AG
InventorsMats Lindgren, Carl Carlander, Philip Holoch
Life of this patent
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Abstract
The invention relates to a method for determining the heat flow (dQ/dt) emanating from a heat transporting fluid (12), which is a mixture of at least two different fluids, and which flows through a flow space (11) from a first position, where it has a first temperature (T1), to a second position, where it has, due to that heat flow (dQ/dt), a second temperature (T2), which is lower than said first temperature (T1), whereby the density and specific heat of said heat transporting fluid (12) is determined by measuring the speed of sound (vs) in said fluid, and said density and specific heat of said heat transporting fluid (12) is used to determine the heat flow (dQ/dt).
Claims20
A method for determining heat flow (dQ/dt) emanating from a heat transporting fluid (12), which is a mixture of at least two different fluids, and which flows through a flow space (11) from a first position, where said heat transporting fluid (12) has a first temperature (T1), to a second position, where said heat transporting fluid (12) has, due to said heat flow (dQ/dt), a second temperature (T2), which is lower than said first temperature (T1), said method comprising the steps of:
- a) measuring a differential temperature (ΔT) between said first temperature (T1) and said second temperature (T2);
- b) measuring a speed of sound (vs) within said heat transporting fluid (12) at a predetermined location of said flow space (11) in a vicinity of said first and/or second position;
- c) measuring an absolute temperature (T) of the heat transporting fluid (12) at said predetermined location;
- d) measuring a volume flow (dV/dt) at said predetermined location;
- e) determining from said measured absolute temperature (T) and said measured speed of sound (vs) a mixing ratio of said heat transporting fluid (12);
- f) determining from said measured absolute temperature (T) and said determined mixing ratio of said heat transporting fluid (12) a density and a specific heat of said heat transporting fluid (12);
- and
- g) determining from said measured differential temperature (ΔT), said measured volume flow (dV/dt), said determined density and said determined specific heat the heat flow (dQ/dt) emanating from said heat transporting fluid (12).
Dependencies are inferred from the claim text.