Heat Cost Allocator Correction Variable for Sensitivity Stabilization
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Solution Overview
Problem
Current heat cost allocators, especially 2-sensor models, face inaccuracies in measuring heat output due to reliance on radiator surface temperature and room air temperature, leading to deviations in calculated heat emission, especially when operating points differ significantly within a heating system.
Innovation Solution
A method and device that utilize a radiator temperature sensor and a room air temperature sensor to calculate a temperature difference, which is then used to determine a corrected heat output by applying a correction variable that compensates for sensitivity fluctuations, ensuring accurate heat emission measurement across all operating points without requiring flow or return temperature sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If 2-sensor heat cost allocators are used to simplify device complexity, then ease of manufacture and installation are improved, but measurement precision deteriorates due to sensitivity fluctuations at different operating points
Solution Approach 1:
The patent applies dynamics by making the evaluation factor dynamic rather than static. The evaluation factor is determined as a function of the temperature difference between radiator and room air, allowing it to adapt and change based on operating conditions. This dynamic adjustment compensates for sensitivity fluctuations at different operating points, resolving the contradiction between simple device design and accurate measurement across varying conditions.
Solution Approach 2:
The patent changes the parameter of the evaluation factor from a constant value to a variable that depends on the temperature difference. By parameterizing the evaluation factor as a function of operating conditions (temperature difference), the system maintains measurement precision across different operating points while keeping the device structure simple. This parameter change allows the same simple 2-sensor device to achieve accurate measurements under varying conditions.
2Measurement precision
If correction variables dependent on temperature difference are applied to improve measurement precision, then measurement precision is improved, but device complexity increases due to additional computational requirements
Solution Approach 1:
The patent segments the correction approach by determining the evaluation factor based on discrete temperature difference ranges or through pre-calculated lookup tables. This segmentation allows the complex correction to be broken down into manageable segments, reducing the computational burden while maintaining measurement precision. The arithmetic unit only needs to identify the appropriate segment or interpolate between table values rather than performing complex real-time calculations.
3Measurement precision
If averaging of temperature differences is performed to determine correction variables, then measurement precision is improved, but loss of time increases due to additional measurement and calculation steps
Solution Approach 1:
The patent applies preliminary action by pre-determining and storing the evaluation factor as a function of temperature difference before actual heat measurement begins. The characteristic values are determined in advance through calibration or calculation and stored in the device memory. During operation, the arithmetic unit only needs to retrieve the appropriate evaluation factor based on the current temperature difference and apply it to the measured temperatures, eliminating the need for real-time averaging calculations and significantly reducing measurement time.
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 enhances the accuracy of heat output determination by stabilizing sensitivity across varying operating conditions, providing a consistent and precise measurement of heat emission, even in complex heating systems with diverse operating points.
Implementation Method 1
a radiator temperature sensor (2) for measuring a radiator temperature θHS and a room air temperature sensor (3) for measuring a room air temperature θRS
Implementation Method 2
The 2-sensor heat cost allocators measure a radiator temperature θHS on the radiator surface and a room air temperature θRS, which is representative of the actual radiator temperature and room temperature θspace but may contain measurement inaccuracies
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A method and a device for detecting the heat output (Q) of a radiator (10) are described, wherein a radiator temperature (ϑHS) and a room air temperature (ϑRS) are detected, and the heat output (Q) of the radiator (10) is determined using (a) the detected radiator temperature (ϑHS), (b) the detected room air temperature (ϑRS) and (c) one or more of the parameters radiator reference power (Q̇N), weighting factor (KQ), weighting factor (KC), weighting factor (KT), radiator exponent (n).It is intended that a raw consumption increment (ΔZroh(ΔEHKV)) is calculated as a functional relationship between the raw consumption increment (ΔZroh) and a temperature parameter (ΔEHKV) that takes into account at least the radiator temperature (ϑHS), that the raw consumption increment (ΔZroh(ΔEHKV)) is converted into a consumption increment (ΔZ = f1(ΔZroh(ΔEHKV),kkorr(ΔEHKV))) by means of a correction parameter (kkorr) through a computational link (f1) such that a sensitivity (E) defined as the ratio of consumption increment (ΔZ) to the actual heat output (Q · Δt = ΔQ) of the radiator (10) follows a target curve (EZiel), and that the correction parameter (kkorr(ΔEHKV)) is stored as a characteristic function depending on the temperature parameter (ΔEHKV).