Two-Period Heating Method for Fast Heat Loss Coefficient Determination
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Solution Overview
Problem
Existing methods for determining the heat loss coefficient of a premises are inefficient, requiring extended measurement times and resulting in increased errors as the measurement time decreases, making it challenging to accurately assess thermal insulation performance within a short period.
Innovation Solution
A method involving two successive time periods with distinct heating powers, where a first heating power is applied to generate a forced temperature evolution followed by a substantially zero second heating power to allow free temperature evolution, enabling the calculation of the heat loss coefficient based on measured temperature slopes, thereby reducing measurement time while maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement time is extended to improve accuracy of heat loss coefficient determination, then measurement precision improves, but loss of time increases
Solution Approach 1:
The patent applies periodic action by using two distinct heating phases (first heating power P1, then second heating power P2) to create controlled temperature variations that enable accurate heat loss coefficient determination over a short measurement period. This periodic heating approach allows the system to capture thermal response characteristics without requiring extended measurement times, thereby resolving the contradiction between measurement precision and time loss.
2Productivity
If measurement time is reduced to improve productivity, then loss of time decreases, but measurement precision deteriorates
Solution Approach 1:
The patent applies preliminary action by first applying a controlled heating power P1 to establish a known temperature rise, then switching to a second heating power P2 to create a measurable cooling phase. This preliminary heating action ensures that sufficient temperature variation is achieved within a short time frame, enabling accurate heat loss coefficient determination without extending measurement duration, thus improving productivity while maintaining precision.
3Speed
If controlled heating is applied to accelerate temperature evolution, then speed of measurement increases, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by varying the heating power between two distinct levels (P1 and P2) to control the temperature evolution rate. This parameter change approach allows the system to accelerate temperature changes for faster measurement while using a relatively simple heating control mechanism, thereby increasing speed without excessively complicating the device structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for the determination of the heat loss coefficient with good accuracy, typically within ±20% error, over a short time frame, such as a single night or a few hours, by applying a controlled thermal impulse and analyzing temperature changes within the premises.
Implementation Method 1
there is undertaken, in the premises, over two successive time periods D1 and D2: i. over the first time period D1, the application of a first heating power P1 of the premises
Implementation Method 2
a campaign of measurements of at least one temperature inside the premises Ti1 at closely-spaced time intervals
Data Source
AI summary
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.