HVAC Controller Temperature Compensation for Internal Heat Rise
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Solution Overview
Problem
Existing HVAC system controllers fail to accurately compensate for internal heat generated by electronic components, leading to inaccurate temperature measurements and inefficient building temperature control.
Innovation Solution
A HVAC controller with a temperature compensation module that detects heat-generating components, calculates steady-state temperature gains, and applies a temperature offset to correct for internal heat, using a first-order low pass filter and empirically determined correction factors to determine the actual ambient temperature.
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 assumes constant heat generation rate regardless of actual component usage
Solution Approach 1:
The patent segments the heat-generating components into distinct categories (processor, display, backlight, relays) and tracks the operational state of each component separately. This allows the temperature compensation to account for the actual heat contribution of each active component rather than using a single aggregate time-based model, thereby improving temperature measurement precision while maintaining implementation feasibility through modular tracking of component states.
2Device complexity
If the controller assumes constant heat generation rate, then the compensation calculation is computationally simple, but the adaptability deteriorates because it cannot account for variable heat generation based on actual component activity
Solution Approach 1:
The patent implements a dynamic temperature compensation model that continuously adapts to the actual operational state of heat-generating components. By monitoring and responding to real-time component activity (processor loading, display updates, backlight intensity, relay switching), the system dynamically adjusts the compensation amount, enabling it to adapt to variable heat generation patterns while maintaining reasonable computational complexity through event-driven updates.
3Device complexity
If the controller does not compensate for internal heat, then the device complexity is low, but the temperature control reliability deteriorates leading to overcooling or overheating
Solution Approach 1:
The patent implements a feedback-based temperature compensation mechanism where the controller continuously monitors the operational states of heat-generating components and adjusts the temperature reading accordingly. The system uses feedback from component status (processor activity, display state, backlight level, relay positions) to calculate and apply appropriate compensation values, thereby improving temperature control reliability without requiring complex hardware modifications beyond the existing temperature sensor and component state detection capabilities.
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 allows for precise temperature control, reducing the risk of overheating or overcooling by accurately accounting for internal heat sources within the controller, thereby improving the performance and efficiency of the HVAC system.
Implementation Method 1
Electronic components within a zone controller (e.g., a wall-mounted thermostat) can generate heat during operation.
Implementation Method 2
The temperature compensation module is configured to identify a steady-state temperature gain associated with each of the detected controller events, to calculate a temperature offset using a summation of the steady-state temperature gains, and to determine the temperature of the building zone outside the housing by subtracting the temperature offset from the temperature measured inside 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 each 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 each of the detected controller events, to calculate a temperature offset using a summation of the steady-state temperature gains, and to determine the temperature of the building zone outside the housing by subtracting the temperature offset from the temperature measured inside the housing.