Refrigerant Charge Judgment Under Controlled Room Temperature
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional air conditioners face errors in refrigerant quantity judgment due to temperature differences in target spaces, and existing compensation methods are inadequate, requiring a more effective approach to reduce judgment errors.
Innovation Solution
The air conditioner adjusts the target space temperature to a predetermined criterion before judging the refrigerant quantity, using a refrigerant quantity judging means that considers operation state quantities and adjusts the temperature to stabilize refrigerant circulation, and performs heating operations if necessary to ensure accurate judgment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If refrigerant quantity judging is performed using predetermined target low pressure, then the refrigerant quantity can be assessed, but judgment errors increase when target space temperature varies
Solution Approach 1:
The patent applies preliminary action by adjusting the target space temperature to a predetermined criterion temperature before performing refrigerant quantity judgment. This preparatory step ensures that the temperature condition is standardized in advance, eliminating temperature variability as a source of judgment error. The temperature adjustment occurs prior to the actual measurement process, creating consistent conditions for accurate assessment.
Solution Approach 2:
The patent changes the temperature parameter from a variable state to a fixed criterion temperature state before measurement. By controlling the target space temperature to satisfy a predetermined criterion temperature condition, the system transforms the operating parameters to ensure consistent measurement conditions, thereby improving judgment accuracy regardless of initial temperature variations.
2Measurement precision
If multiple regression equations are provided for different target low pressures, then judgment accuracy improves, but data requirements and system complexity increase enormously
Solution Approach 1:
Instead of preparing multiple regression equations in advance, the patent uses preliminary temperature adjustment to a single criterion temperature. This approach eliminates the need for multiple pre-prepared equations by ensuring that the measurement always occurs under standardized conditions, thereby maintaining accuracy while dramatically reducing system complexity.
Solution Approach 2:
The patent creates a universal measurement condition by using a single criterion temperature that works for all refrigerant quantity judgments. This universal approach replaces the need for multiple specialized regression equations, allowing one standardized process to handle all measurement scenarios regardless of initial temperature conditions.
3Measurement precision
If compensation calculation is performed with multiple target low pressures, then some judgment errors are reduced, but errors increase when discrepancy between target and actual operation is large
Solution Approach 1:
The patent performs preliminary temperature adjustment to a criterion temperature before measurement, ensuring that the actual operating conditions match the predetermined measurement conditions. This eliminates the discrepancy between target and actual operation that causes reliability issues in compensation calculation methods.
Solution Approach 2:
The patent creates equipotential measurement conditions by controlling the target space temperature to satisfy a predetermined criterion temperature condition. This ensures that all measurements are performed under equivalent temperature conditions, eliminating the variability and reliability issues that arise when target and actual operating conditions differ.
Data Source
AI summary
An air conditioner that adjusts the temperature in a target space includes a refrigerant circuit and a controller. The refrigerant circuit is configured by the interconnection of a compressor, an outdoor heat exchanger, indoor expansion valves, and indoor heat exchangers. The controller adjusts the temperature such that predetermined temperature is reached in a target space. In addition, the controller judges the refrigerant quantity in the refrigerant circuit based on at least one value of operation state quantity of constituent equipment or refrigerant flowing in the refrigerant circuit. The controller achieves a state in which the target space temperature satisfies a predetermined temperature condition.