Dynamic thermostat temperature compensation modeling and control in an HVAC system
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Solution Overview
Problem
HVAC systems face challenges in accurately controlling temperature due to heat generated by components, which can lead to incorrect temperature measurements and inefficiencies, especially with newer controllers that produce more heat and are affected by airflow.
Innovation Solution
The implementation of a dynamic calibration mode in the HVAC system controller, which enables and disables fans to determine a dynamic correction factor by monitoring temperatures during fan-enabled and fan-disabled periods, accounting for heat generation and airflow, and adjusts temperature measurements accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the HVAC system controller includes heat-generating components (CPU, display, circuitry), then the controller can perform control functions, but the heat generated affects temperature sensor measurements and reduces measurement precision
Solution Approach 1:
The patent extracts the heat-generating components (CPU, display, circuitry) from the immediate vicinity of the temperature sensor by providing them with dedicated heat sinks and thermal management structures. This spatial separation reduces the thermal influence on sensor measurements while maintaining control functionality.
Solution Approach 2:
The patent introduces thermal barriers and heat sinks as intermediary elements between the heat-generating components and the temperature sensor. These intermediaries absorb and redirect heat away from the sensor, preventing direct thermal coupling while allowing both components to coexist in the same controller housing.
2Temperature
If thermal energy is vented from the HVAC system controller, then heat generation is managed, but internal airflow is generated that affects temperature sensor measurements
Solution Approach 1:
The patent creates different airflow zones within the controller housing: a venting zone for heat dissipation and a protected zone for the temperature sensor. By providing localized thermal management structures and directional airflow paths, the system allows heat venting in specific areas while maintaining stable thermal conditions in the sensor measurement area.
3Loss of energy
If airflow is directed through the HVAC system controller, then heat management is improved, but the airflow affects temperature sensor readings and reduces measurement accuracy
Solution Approach 1:
The patent segments the controller interior into distinct functional zones: an airflow channel for heat management and a isolated measurement zone for the temperature sensor. Physical barriers and thermal insulation structures divide the internal space, allowing airflow to efficiently remove heat from components while preventing the same airflow from directly impacting the sensor readings.
4Measurement precision
If fans are enabled during calibration, then dynamic correction factors can be determined, but additional heat generation and airflow complexity are introduced
Solution Approach 1:
The patent implements periodic calibration cycles where fans are temporarily enabled to create controlled airflow conditions for determining dynamic correction factors. The system alternates between calibration mode (with fans enabled) and normal operation mode, using the periodic fan activation to gather data for correction algorithms without continuously complicating the thermal environment.
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 improves temperature control accuracy by accounting for heat generation and airflow, reducing inefficiencies and enhancing the system's ability to maintain a consistent and comfortable environment.
Implementation Method 1
Venting of the thermal energy can generate internal airflow through the HVAC system controller that effects temperature sensor measurements. Additionally, airflows in a room can affect the internal airflow through the HVAC system controller
Implementation Method 2
An HVAC system controller can generate heat that can affect its ability to correctly control temperature. The HVAC system controller is designed to isolate the temperature sensor from the heat generating sources to minimize the effect of the thermal energy on the temperature measurement
Data Source
AI summary
Systems and methods for configuring a temperature control system of a heating, ventilation, and air conditioning (HVAC) system controller are described. The HVAC system controller includes a processor in communication with a memory and a user interface. The processor is configured to determine a dynamic parameter related to a dynamic property of a conditioned space and maintain a controlled environment within the conditioned space by utilizing the dynamic parameter.