Two-stage compression air conditioning system and method of controlling gas replenishment thereof
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Solution Overview
Problem
Current two-stage compression air conditioning systems face reliability and performance issues due to backflow of replenished gas, which reduces heating capacity and energy efficiency, and is not effectively controlled.
Innovation Solution
A method to control gas replenishment in a two-stage compression air conditioning system by using temperature and pressure sensors to determine the operation state of gas flow and control a stop valve, preventing backflow by opening or closing the valve based on superheat degree and temperature differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gas replenishment is performed in a two-stage compression system, then heating capacity and energy efficiency are improved, but backflow of replenished gas occurs reducing reliability and performance
Solution Approach 1:
The control method monitors the temperature difference across the stop valve and uses this feedback to determine the flow direction. When backflow is detected (abnormal temperature difference pattern), the system automatically closes the stop valve to prevent harmful effects, thus maintaining reliability while allowing gas replenishment to improve heating capacity during normal operation.
Solution Approach 2:
The stop valve is dynamically controlled based on real-time temperature difference measurements. The valve transitions between open and closed states according to the detected flow direction, enabling the system to adaptively prevent backflow while maintaining gas replenishment benefits during normal conditions.
2Productivity
If gas replenishment is performed in a two-stage compression system, then compression efficiency is improved, but backflow causes oil starvation and compressor wear
Solution Approach 1:
The control method continuously monitors temperature parameters to detect backflow conditions. When backflow is detected through abnormal temperature difference patterns, the stop valve is closed to prevent high-temperature exhaust gas from entering the flash evaporator, thereby preventing oil starvation and compressor wear while maintaining compression efficiency during normal operation.
3Productivity
If gas replenishment is performed in a two-stage compression system, then heating capacity is improved, but backflow reduces energy efficiency
Solution Approach 1:
The stop valve is dynamically adjusted based on real-time temperature difference measurements across the valve. During normal gas replenishment, the valve remains open to maintain heating capacity. When backflow is detected through abnormal temperature patterns, the valve closes to prevent energy loss, thus maintaining energy efficiency while preserving heating capacity benefits.
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
Effectively reduces backflow of replenished gas, ensuring reliable and efficient operation of the compressor, extending its service life and maintaining stable energy efficiency.
Implementation Method 1
obtaining a first temperature value Tm1 and an intermediate pressure value Pm in the first pipeline, and a second temperature value Tm2 in the second pipeline; and controlling the stop valve according to the first temperature value Tm1, the intermediate pressure value Pm and the second temperature value Tm2
Implementation Method 2
obtaining a first temperature value Tm1 and an intermediate pressure value Pm in the first pipeline, and a second temperature value Tm2 in the second pipeline; and controlling the stop valve according to the first temperature value Tm1, the intermediate pressure value Pm and the second temperature value Tm2
Data Source
AI summary
Described is a two-stage compression air conditioning system and a method of controlling gas replenishment thereof. The two-stage compression air conditioning system includes a two-stage compressor and a flash evaporator, wherein a first port of the flash evaporator is connected to one end of a stop valve by a first pipeline and the other end of the stop valve is connected to a first gas intake of the two-stage compressor by a second pipeline. The method of controlling gas replenishment includes: obtaining a first temperature value and an intermediate pressure value in the first pipeline, and a second temperature value in the second pipeline; and controlling the stop valve according to the first temperature value, the intermediate pressure value and the second temperature value.