Air-Conditioner Bypass Flow for Heating During Defrost
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Solution Overview
Problem
Conventional air-conditioning systems face efficiency and heating capacity issues during simultaneous heating and defrosting operations due to the need to raise refrigerant pressure for both functions, leading to decreased performance.
Innovation Solution
The system incorporates a main pipe connecting indoor and outdoor units with parallel outdoor heat exchangers, bypass pipes, and flow switching devices, allowing refrigerant to bypass the injection compressor during defrosting, thus maintaining high-pressure refrigerant flow for heating without lowering suction pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the injection compressor raises the pressure of both heating refrigerant and defrosting refrigerant, then both functions can be performed, but the energy efficiency decreases
Solution Approach 1:
The patent divides the outdoor heat exchangers into multiple units connected in parallel, allowing independent control of heating and defrosting operations. The refrigerant flow is segmented into separate paths: one path maintains high-pressure refrigerant for heating through the main outdoor heat exchanger, while another path provides defrosting to a specific outdoor heat exchanger without requiring pressure reduction for the entire system. This segmentation enables simultaneous heating and defrosting while maintaining overall system efficiency.
2Object-affected harmful factors
If a large amount of high-temperature and high-pressure refrigerant flows into the bypass pipe for defrosting, then frost can be melted, but the heating capacity decreases
Solution Approach 1:
The patent applies local quality by providing defrosting function only to the specific outdoor heat exchanger that requires it, rather than reducing the pressure and temperature of refrigerant for the entire system. The bypass pipe is configured to supply defrosting refrigerant locally to the targeted heat exchanger, while the main refrigerant flow continues at high pressure and temperature for heating. This localized approach ensures that heating capacity is maintained in non-defrosting units while frost is effectively removed from the required unit.
3Object-affected harmful factors
If the refrigerant pressure is lowered for defrosting operation, then frost can be removed, but the suction pressure for the injection compressor decreases
Solution Approach 1:
The patent segments the refrigerant circulation system into multiple parallel paths, allowing the defrosting operation to be performed on a specific outdoor heat exchanger without affecting the suction pressure of the injection compressor. The bypass pipe creates a separate circulation loop for defrosting that draws refrigerant locally, while the main refrigerant circulation continues to maintain adequate suction pressure for compressor operation.
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 configuration reduces the workload of the injection compressor, improves energy efficiency, and enhances heating capacity by allowing the refrigerant to maintain high pressure for heating while defrosting, thereby improving overall system performance.
Implementation Method 1
an injection compressor (1), a four-way valve (3) connected to a discharge side of the injection compressor (1)
Implementation Method 2
outdoor heat exchangers (9a, 9b) connected in parallel... an outdoor heat exchanger (9b) heating the inside of a room
Implementation Method 3
a defrosting operation of removing frost in the outdoor heat exchangers (9a, 9b)... melt frost
Data Source
AI summary
A first flow switching device causes part of a refrigerant discharged from an injection compressor to flow through a first bypass pipe and be supplied to an outdoor heat exchanger targeting for defrosting. A second flow switching device causes part of the refrigerant supplied to the outdoor heat exchanger targeting for defrosting to enter a second bypass pipe.