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US 10,481,019 B2Granted
Method and device for determining the heat loss coefficient of a premises
AssigneeSaint-Gobain Isover
InventorsGuillaume Pandraud, Florent Alzetto
Life of this patent
Estimating the term…
Abstract
A method for determining a heat loss coefficient of a premises includes undertaking application of first and second heating powers, respectively, in the premises over two successive time periods, selecting for each of the first and second time periods, a time interval for which the evolution is substantially linear, determining the slope of the tangent to the curve (Tik(t))k=1 or 2 over each time interval; and deducing the value of the heat loss coefficient of the premises on the basis of the slopes.
Claims23
A method for reducing a value Kcalc of a heat loss coefficient K of a premises, comprising:
- undertaking, in the premises, over two successive time periods D1 and D2 :
- i. over the first time period D1, an application of a first heating power P1 of the premises, a campaign of measurements of at least one temperature inside the premises Ti1 at closely-spaced time intervals, and a determination of the temperature of an outside air Te1 at closely-spaced time intervals, the first heating power P1 being such that a parameter
- α
- =
- 1
- -
- Δ
-
-
- T
- 1
-
- (
- 0
- )
-
- K
- ref
- P
- 1
-
- is less than or equal to 0.8 with ΔT1(0)=Ti1(t=0)−Tem, where t=0 is a starting point of the first time period D1, Tem is an average temperature of the outside air over all of the time periods D1 and D2 and Kref is a reference value of a heat loss coefficient K of the premises, and then
- ii. over the second time period D2, the application of a substantially zero second heating power P2 of the premises, the campaign of measurements of at least one temperature inside the premises Ti2 at closely-spaced time intervals, and the determination of the temperature of the outside air Te2 at closely-spaced time intervals;
- selecting for each of the first and second time periods D1 and D2, a time interval Δt1 or Δt2 for which an evolution Ti1(t) or Ti2(t) is substantially linear, where the time intervals Δt1 and Δt2 are such that the time interval Δt1 extends up to an end of the first period D1 of application of the first heating power P1 and such that, when the starting points of the first period D1 and of the second period D2 are superimposed, the time intervals Δt1 and Δt2 have a same end point;
- determining a slope a1 or a2 of a tangent to a curve (Tik(t))k=1 or 2 over each time interval Δt1 or Δt2;
- determining the value Kcalc of the heat loss coefficient K of the premises based on the slopes a1 and a2;
- controlling the error in the value Kcalc of the heat loss coefficient K of the premises by controlling the parameter α less than or equal to 0.8;
- and
- reducing the value Kcalc of the heat loss coefficient K of the premises based on the controlled error, the value Kcalc of the heat loss coefficient K of the premises being greater than or equal to 80% of the heat loss coefficient K of the premises and less than or equal to 120% of the heat loss coefficient K of the premises.
26 more elements
An information recording medium including instructions for implementation of a method for reducing the heat loss coefficient K of a premises when the instructions are executed by an electronic computation unit, the method comprising:
- determining a first heating power P1 to be applied over a first time period D1 based on values of α, ΔT1(0) and Kref, the first heating power P1 being such that a parameter
- α
- =
- 1
- -
- Δ
-
-
- T
- 1
-
- (
- 0
- )
-
- K
- ref
- P
- 1
-
- is less than or equal to 0.8 with ΔT1(0)=Ti1(t=0)−Tem, where t=0 is a starting point of the first time period D1, Tem is an average temperature of the outside air over all of the time periods D1 and D2 and Kref is a reference value of a heat loss coefficient K of the premises;
- applying the first heating power P1 of the premises, campaigning measurements of at least one temperature inside the premises Ti1 at closely-spaced time intervals, and determining the temperature of an outside air Te1 at closely-spaced time intervals, over the first time period D1;
- determining, over each time interval Δt1 or Δt2, the slope a1 or a2 based on the measurements of the temperature inside the premises Ti1 or Ti2;
- applying a substantially zero second heating power P2 of the premises, campaigning measurements of at least one temperature inside the premises Ti2 at closely-spaced time intervals, and determining the temperature of the outside air Te2 at closely-spaced time intervals, over the second time period D2;
- selecting for each of the first and second time periods D1 and D2, a time interval Δt1 or Δt2 for which an evolution Ti1(t) or Ti2(t) is substantially linear, the time interval Δt1 extending up to an end of the first period D1 of application of the first heating power P1, and when the starting points of the first period D1 and of the second period D2 are superimposed, the time intervals Δt1 and Δt2 have a same end point;
- determining a slope a1 or a2 of a tangent to a curve (Tik(t))k=1 or 2 over each time interval Δt1 or Δt2;
- determining the value Kcalc of the heat loss coefficient K of the premises based on the slopes a1 and a2;
- controlling the error in the value Kcalc of the heat loss coefficient K of the premises by controlling the parameter α less than or equal to 0.8;
- and
- reducing the value Kcalc of the heat loss coefficient K of the premises based on the controlled error, the value Kcalc of the heat loss coefficient K of the premises being greater than or equal to 80% of the heat loss coefficient K of the premises and less than or equal to 120% of the heat loss coefficient K of the premises.
27 more elements
A device for reducing a value Kcalc of a heat loss coefficient K of a premises, the device comprising:
- at least one heating element including a controlled power source;
- at least one temperature sensor measuring temperature inside the premises Tik and temperature of outside air Tek;
- at least one power sensor measuring a heating power Pk delivered in the premises;
- and
- Tik Pk Tek
- processing circuitry configured to
- determine a first heating power P1 to be applied over a first time period D1, based on values of α, ΔT1(0) and Kref, over the first time period D1, by applying the first heating power P1 of the premises, campaigning of measurements of at least one temperature inside the premises Ti1 at closely-spaced time intervals, and determining the temperature of the outside air Te1 at closely-spaced time intervals, the first heating power P1 being such that a parameter
- α
- =
- 1
- -
- Δ
-
-
- T
- 1
-
- (
- 0
- )
-
- K
- ref
- P
- 1
-
- is less than or equal to 0.8 with ΔT1(0)=Ti1(t=0)−Tem, where t=0 is a starting point of the first time period D1, Tem is an average temperature of the outside air over all of the time periods, and Kref is a reference value of a heat loss coefficient K of the premises,
- determine, over each time interval Δt1 or Δt2, a slope a1 or a2 based on the measurements of the temperature inside the premises Ti1 or Ti2, over a second time period D2, by applying a substantially zero second heating power P2 of the premises, campaigning measurements of at least one temperature inside the premises Ti2 at closely-spaced time intervals, and determining the temperature of the outside air Te2 at closely-spaced time intervals,
- determine the value Kcalc of the heat loss coefficient K of the premises based on the slopes a1 and a2,
- control the error in the value Kcalc of the heat loss coefficient K of the premises by controlling the parameter α less than or equal to 0.8, and
- reduce the value Kcalc of the heat loss coefficient K of the premises based on the controlled error, the value Kcalc of the heat loss coefficient K of the premises being greater than or equal to 80% of the heat loss coefficient K of the premises and less than or equal to 120% of the heat loss coefficient K of the premises.
28 more elements
Dependencies are inferred from the claim text.