HVAC Controller Heat Rise Compensation for Accurate Zone Sensing
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Solution Overview
Problem
Existing HVAC system controllers fail to accurately compensate for the heat generated by internal electronic components, leading to incorrect temperature readings and inefficient building climate control.
Innovation Solution
The implementation of a temperature compensation module within the HVAC controller that detects specific heat-generating components and calculates a temperature offset using steady-state temperature gains, allowing for precise adjustment of temperature readings to reflect actual ambient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the controller uses the time since power-up as the basis for temperature compensation, then the compensation method is simple to implement, but the temperature measurement precision deteriorates because it cannot account for variable heat generation from different components
Solution Approach 1:
The patent segments the heat generation source into individual components (display, processor, relays, communication modules) rather than treating the controller as a single unit. Each component's heat contribution is measured and stored separately, allowing the system to calculate temperature offset based on which specific components are active, thereby improving measurement precision while maintaining implementation feasibility through modular data collection.
Solution Approach 2:
The patent applies local quality by assigning different heat generation characteristics to different components within the controller. Instead of using a uniform compensation approach, the system identifies and compensates for heat from specific localized sources (e.g., display during daytime, relays during nighttime) based on their operational status, enabling more precise temperature measurement.
2Reliability
If the controller compensates for heat from all components uniformly, then the temperature compensation is comprehensive, but the adaptability deteriorates because it cannot adjust to variable operational states of different components
Solution Approach 1:
The patent implements dynamics by making the temperature compensation adaptive to the real-time operational state of components. The system dynamically determines which components are active (e.g., display on/off, relays open/closed, communication in progress) and adjusts the temperature offset calculation accordingly, allowing the compensation to evolve with changing operational conditions rather than remaining static.
Solution Approach 2:
The patent uses feedback mechanisms to monitor the operational state of each component and adjust the temperature compensation in real-time. The controller detects whether components are active or inactive and uses this feedback information to modify the heat generation estimate, creating a closed-loop system that continuously adapts to current operational conditions.
3Measurement precision
If the controller uses a detailed component-based heat generation model, then the temperature measurement precision improves, but the device complexity increases due to multiple sensors and data collection requirements
Solution Approach 1:
The patent applies self-service by having the controller's existing control logic and component status information serve the dual purpose of both controlling the HVAC system and providing data for temperature compensation. The controller already tracks which components are active for operational purposes; this same information is reused to calculate heat generation, eliminating the need for separate sensing systems and reducing overall device complexity.
Solution Approach 2:
The patent implements universality by making the component status tracking system serve multiple functions: it controls the operational state of HVAC components and simultaneously provides the data needed for temperature compensation calculations. This multi-functionality eliminates redundant systems and reduces overall controller complexity while maintaining high measurement precision.
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 solution enables more accurate temperature and humidity readings, improving the efficiency and effectiveness of HVAC system operations by accounting for variable heat generation within the controller, thereby enhancing climate control precision and reducing energy wastage.
Implementation Method 1
a temperature sensor configured to measure the temperature of the building zone inside the housing
Implementation Method 2
one or more heat-generating components contained within the housing. The heat-generating components cause a temperature inside the housing to exceed a temperature of the building zone outside the housing
Data Source
AI summary
A HVAC controller includes a housing and one or more heat-generating components contained within the housing. The heat-generating components cause a temperature inside the housing to exceed a temperature outside the housing. The controller includes a temperature sensor configured to measure the temperature inside the housing and a controller event detector configured to detect, for at least one of the heat-generating components, a controller event that generates heat inside the housing. The controller further includes a temperature compensation module configured to identify a steady-state temperature gain associated with the detected controller event, to calculate a temperature offset using a summation of the steady-state temperature gain, to determine the temperature of the building zone outside the housing by subtracting the temperature offset from the temperature measured inside the housing, and to store the temperature offset.