Air Conditioner Defrost Control Using Refrigerant Pressure Sensing
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Solution Overview
Problem
Current air conditioner defrosting control methods, such as time-based and temperature-based controls, often result in energy waste and incorrect defrosting judgments due to dust jams, especially in cold regions like north China.
Innovation Solution
An intelligent defrosting control method that uses high- and low-pressure sensors to measure refrigerant pressure and compare it to a preset standard value, triggering defrosting mode only when necessary, and adjusts refrigerant pressure through a jet steam system to optimize heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time-based or temperature-based defrosting control is used, then defrosting can be performed regularly, but unnecessary defrosting occurs in cold regions causing energy waste
Solution Approach 1:
The patent changes the control parameter from time or surface temperature to high-pressure refrigerant pressure. By monitoring the pressure parameter of the refrigerant in the outdoor heat exchanger, the system can accurately determine whether frosting actually occurs, thereby avoiding unnecessary defrosting operations and reducing energy consumption.
Solution Approach 2:
The patent replaces the mechanical/thermal measurement approach (surface temperature sensors) with a pressure-based detection system. By using pressure sensors to monitor refrigerant pressure changes, the system achieves more reliable frost detection without the drawbacks of temperature-based methods.
2Reliability
If defrosting is controlled by measuring surface temperature of finned tube, then defrosting can be triggered, but false judgment occurs due to dust jams
Solution Approach 1:
The patent introduces refrigerant pressure as an intermediary parameter to indirectly detect frosting conditions. Instead of directly measuring the finned tube surface temperature which is susceptible to dust interference, the system uses pressure changes in the refrigerant flow as a mediator to infer the presence of frost, thereby eliminating false judgments caused by dust jams.
Solution Approach 2:
The patent extracts the detection function from the surface temperature measurement system and relocates it to the refrigerant pressure monitoring system. By separating the detection mechanism from the directly affected component (finned tube surface), the system becomes immune to dust interference that plagues surface temperature measurements.
3Power
If jet steam system injects refrigerant gas, then heating effect is improved, but refrigerant pressure needs precise control
Solution Approach 1:
The patent implements a feedback control mechanism where the high-pressure sensor continuously monitors refrigerant pressure and feeds this information back to the control system. During jet steam injection, the system adjusts the refrigerant flow based on real-time pressure feedback, ensuring precise pressure control while maintaining optimal heating effect.
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 method reduces unnecessary defrosting cycles, enhances heating efficiency, and conserves energy by accurately determining frost conditions and optimizing refrigerant pressure.
Implementation Method 1
placing a high-pressure sensor on the exhaust pipe of the compressor of the air conditioner to measure the pressure of the high pressure refrigerant
Implementation Method 2
putting a low-pressure sensor into the suction pipe of the compressor to measure gas pressure value
Implementation Method 3
turn on the jet steam system of the air conditioner to inject refrigerant gas for the compressor
Data Source
AI summary
An intelligent defrosting control for an air conditioner is disclosed, which comprises the following steps: setting a standard air pressure value; placing a high-pressure sensor on the exhaust pipe of the compressor of the air conditioner to measure the air pressure; When the air pressure measured by the high-pressure sensor is lower than the standard air pressure value, said air conditioner begins to come into the defrosting mode; otherwise, said air conditioner working in previous mode.