Vapor Injection Compressor Mode Switching for Low-Vibration HVAC
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Solution Overview
Problem
Conventional air conditioning systems face limitations in achieving high power output and low vibration due to single-rotor compressors' noise and vibration issues, and double-rotor compressors' poor performance at ultra-high and ultra-low temperatures, leading to energy inefficiency and reduced capacity.
Innovation Solution
An air conditioning system with an enhanced vapor injection compressor that can switch between single-rotor and double-rotor operation modes using a variable capacity compressor, combined with a direction switching assembly and throttling elements, allowing for adaptive operation based on temperature conditions to optimize power and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-rotor compressor is adopted, then the cost is reduced, but the vibration and noise are large especially at low frequency
Solution Approach 1:
The compressor is divided into two independent rotors (first rotor and second rotor) that can operate independently or together. This segmentation allows the system to use only one rotor when low power is needed, reducing vibration and noise, while maintaining the cost advantage of a simpler design compared to traditional double-rotor systems.
2Productivity
If a common double-rotor compressor is adopted, then the refrigeration and heating capacity is improved, but the energy efficiency deteriorates due to increased leakage
Solution Approach 1:
The compressor dynamically adjusts its operating mode based on system demands. The control system can switch between single-rotor mode, double-rotor mode, and variable capacity modes, optimizing energy efficiency by using only the necessary compression capacity rather than always operating both rotors at full capacity.
3Object-generated harmful factors
If a common double-rotor compressor with double modes is adopted, then some vibration issues are solved, but the system performance sharply degrades at ultra-high temperature refrigeration and ultra-low temperature heating due to increased compression ratio
Solution Approach 1:
The compression task is segmented between two rotors that can operate independently. When ultra-high compression ratios are needed, only one rotor operates at high capacity, avoiding the performance degradation that occurs when both rotors operate simultaneously at extreme compression ratios. This segmentation maintains vibration control while preserving system performance.
4Productivity
If the air conditioning system needs large power output for refrigeration at high temperature and heating at low temperature, then the refrigeration and heating speed is improved, but the power consumption increases
Solution Approach 1:
The system merges the output of two rotors to achieve large power output when needed for rapid refrigeration or heating. The vapor injection mechanism combines refrigerant from both rotors, allowing the system to deliver high capacity when required while maintaining the option to use only one rotor for lower power demands, thus optimizing the balance between speed and power consumption.
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 system achieves high power output at high frequencies and low power and vibration at low frequencies, ensuring efficient refrigeration and heating while maintaining stability and energy efficiency across varying temperature conditions.
Implementation Method 1
a first throttling element connected in series between the first port and the first heat exchanger, and a second throttling element connected in series between the second port and the second heat exchanger
Implementation Method 2
a flash evaporator having an air outlet, a first port and a second port, in which the air outlet is connected to the air supplement port
Implementation Method 3
a first heat exchanger having a first end connected with the second valve port and a second end; a second heat exchanger having a first end connected with the third valve port and a second end
Data Source
AI summary
An air conditioning system and a method for controlling the same are provided. The air conditioning system includes an enhanced vapor injection compressor, first and second direction switching assemblies, first and second heat exchangers and a flash evaporator. The enhanced vapor injection compressor has an air discharge port, an air supplement port, first and second air suction ports, and an air return port. Pressure in a sliding vane chamber of an air cylinder corresponding to the second air suction port is equal to a discharge pressure at the air discharge port. A first pipe port of the first direction switching assembly is connected with the second air suction port, a second pipe port thereof is connected with the air discharge port and a third pipe port thereof is connected with the liquid accumulator, and the first pipe port is communicated with one of the second and third pipe ports.