Systems and methods to operate HVAC system in variable operating mode
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Solution Overview
Problem
Existing HVAC systems are limited in their ability to operate in various modes due to incompatibility with certain thermostats that do not provide necessary signals for adjusting operating modes, leading to restricted performance.
Innovation Solution
The implementation of secondary control circuitry that determines the type of thermostat and provides additional data or operates in a calibration mode to enable the HVAC system to function in variable operating modes, using either calibrated or predetermined values to compensate for missing signals from conventional thermostats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the HVAC system uses primary control circuitry to operate in variable operating modes, then the system performance and efficiency are improved, but the compatibility with conventional thermostats deteriorates because they do not provide necessary signals
Solution Approach 1:
The patent introduces secondary control circuitry as an intermediary component that receives signals from conventional thermostats and translates them into appropriate control signals for the HVAC system's variable operating modes. This mediator enables compatibility between simple conventional thermostats and advanced HVAC systems that require more complex signaling.
Solution Approach 2:
The secondary control circuitry detects the thermostat type and dynamically changes control parameters, such as determining whether to use calibrated target temperatures or predetermined temperature reference values based on the thermostat's capabilities. This parameter adaptation allows the system to work with both communicating and non-communicating thermostats.
2Adaptability or versatility
If the HVAC system operates with conventional thermostats using predetermined temperature reference values, then the compatibility is improved, but the operational efficiency and precision deteriorate compared to using calibrated target temperatures
Solution Approach 1:
The system performs a calibration mode operation beforehand to determine calibrated target temperatures specific to the installation environment. These pre-determined calibrated values are then stored and used during normal operation, eliminating the need for continuous calibration while maintaining precision.
Solution Approach 2:
The secondary control circuitry automatically detects the thermostat type and self-adjusts the control strategy, selecting between calibrated target temperatures and predetermined reference values without requiring manual intervention. The system also performs automatic calibration routines to maintain accuracy.
3Measurement precision
If the system performs calibration mode operation to determine calibrated target temperature, then the operational precision is improved, but the time required for initial setup and the complexity of control increases
Solution Approach 1:
The calibration mode is executed as a one-time preliminary action during initial system setup or after significant changes. The calibrated target temperatures determined during this preliminary calibration are stored in memory and reused during all subsequent normal operations, avoiding repeated calibration time loss.
4Reliability
If the HVAC system monitors run time and switches between calibrated and predetermined temperature references, then the operational reliability is improved, but the device complexity increases
Solution Approach 1:
The secondary control circuitry continuously monitors the HVAC system's run time and feedback from the thermostat, using this information to dynamically switch between calibrated target temperatures and predetermined temperature reference values. This feedback mechanism ensures reliable operation by adapting to actual system conditions.
Data Source
AI summary
A heating, ventilation, and/or air conditioning (HVAC) system includes secondary control circuitry configured to communicatively couple to primary control circuitry of the HVAC system that is configured to operate the HVAC system in a variable operating mode. The secondary control circuitry is configured to cause operation of the HVAC system in a calibration mode to determine a calibrated target temperature and transmit the calibrated target temperature to the primary control circuitry to enable operation of the HVAC system in the variable operating mode via the primary control circuitry based on the calibrated target temperature.