HVAC Sensor Calibration Using Saturation Parameter for Drift Reduction
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Solution Overview
Problem
HVAC systems are susceptible to undesirable variations in sensor readings due to sensor drift and inaccuracies, which affect the efficiency and accuracy of temperature and pressure detection in working fluids.
Innovation Solution
A method for sensor calibration in HVAC systems involves determining a saturation parameter of the working fluid during an idle state, calculating deviations from detected parameters, and adjusting these readings to compensate for sensor drift, thereby improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional sensors are used in HVAC systems, then the system structure remains simple, but sensor drift causes undesirable variations in temperature readings
Solution Approach 1:
The patent changes the parameter being measured by sensors from absolute temperature to temperature differential. By measuring the difference between evaporator and condenser temperatures rather than absolute values, the system becomes insensitive to sensor drift and calibration errors, thereby improving measurement precision and reliability
Solution Approach 2:
The patent introduces an intermediary calculation method that uses saturation temperature relationships and temperature differentials as mediators. Instead of directly using raw sensor readings for control decisions, the system processes them through thermodynamic relationships to derive more reliable parameters for system control
2Measurement precision
If sensor calibration is performed continuously, then measurement accuracy improves, but system complexity and energy consumption increase
Solution Approach 1:
The patent performs sensor calibration preliminarily during system startup or idle periods when the refrigerant is in saturation state. By establishing baseline saturation temperature relationships in advance, the system eliminates the need for continuous calibration mechanisms, reducing device complexity while maintaining measurement precision
Solution Approach 2:
The system uses its own operating conditions (saturation states during startup or idle periods) to perform self-calibration. The refrigerant's natural saturation behavior provides the reference conditions needed for calibration, eliminating the need for external calibration equipment or complex calibration systems
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
The method reduces sensor drift and enhances the accuracy of temperature and pressure readings, leading to more efficient operation and control of HVAC systems.
Implementation Method 1
determining a saturation parameter of the working fluid with a controller of the HVAC system based on the detected calibration parameter and saturation parameter data
Implementation Method 2
one or more sensors disposed along the working fluid circuit, where the one or more sensors are configured to detected one or more parameters of the working fluid
Data Source
AI summary
A method for sensor calibration in a heating, ventilation, and air-conditioning system (HVAC system) includes receiving data indicative of a detected calibration parameter of a working fluid of the HVAC system in an idle state and determining a saturation parameter of the working fluid with a controller of the HVAC system based on the detected calibration parameter and saturation parameter data. The method further includes receiving a first detected parameter from a sensor of the HVAC system, comparing the saturation parameter to the first detected parameter and determining a deviation between the saturation parameter and the first detected parameter. The method further includes receiving a second detected parameter of the working fluid from the sensor of the HVAC system with the HVAC system in an operating state and adjusting the second detected parameter using the deviation to determine an adjusted second detected parameter of the working fluid.