Outdoor Unit Bypass Piping for Balanced Heating Refrigerant Flow
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Solution Overview
Problem
In a multi-chamber air conditioner system, using a triple-pipe outdoor unit as a double-pipe outdoor unit can lead to refrigerant accumulation in stopped units during heating operations, causing a lack of refrigerant in operating units and potential compressor oil issues when restarted.
Innovation Solution
Incorporating a bypass pipe with a check valve or solenoid valve in the outdoor unit to redirect refrigerant flow during heating operations, preventing accumulation in stopped units by allowing refrigerant to flow out via the bypass pipe and ensuring adequate refrigerant circulation between operating units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a triple-pipe outdoor unit is used as a double-pipe outdoor unit, then the existing outdoor unit can be utilized without adding new components, but refrigerant accumulates in stopped units during heating operations causing insufficient refrigerant in operating units
Solution Approach 1:
A bypass pipe is introduced as an intermediary component to redirect refrigerant flow. The bypass pipe connects the discharge side and intake side of the outdoor unit, allowing refrigerant to bypass stopped units and maintain proper circulation in operating units during heating operations.
Solution Approach 2:
A flow control valve is installed on the bypass pipe to dynamically adjust refrigerant flow distribution. The valve opens during heating operations to allow bypass flow and closes during cooling operations, enabling adaptive refrigerant circulation based on operational mode.
2Device complexity
If refrigerant flows through stopped outdoor units during heating operations, then the existing pipe configuration is maintained, but compressor oil becomes insufficient when units are restarted
Solution Approach 1:
The bypass pipe serves as a mediator that prevents refrigerant from flowing through stopped units, thereby preventing compressor oil dilution and ensuring reliable compressor operation when units are restarted.
Solution Approach 2:
The bypass pipe is pre-configured to redirect refrigerant flow before it can enter stopped units, preventing the harmful effect of refrigerant accumulation and oil dilution in advance.
3Productivity
If multiple outdoor units are operated in a multi-chamber system, then cooling capacity is sufficient for all indoor units, but refrigerant distribution becomes unbalanced during heating operations
Solution Approach 1:
The bypass pipe acts as a mediator that redistributes refrigerant flow in the heating mode, ensuring adequate refrigerant supply to operating outdoor units while preventing accumulation in stopped units, thus maintaining balanced refrigerant distribution across the multi-chamber system.
Solution Approach 2:
The flow control valve dynamically adjusts refrigerant distribution based on the operational status of outdoor units, ensuring optimal refrigerant flow to operating units while blocking flow to stopped units during heating operations.
Data Source
AI summary
An outdoor unit of an air conditioner coupled to an indoor unit by a liquid pipe and a gas pipe, includes: a compressor; an outdoor heat exchanger; a discharge pipe coupled to a refrigerant discharge side of the compressor; an intake pipe coupled to a refrigerant intake side of the compressor; an outdoor-unit high-pressure gas pipe coupled to the discharge pipe; an outdoor-unit low-pressure gas pipe coupled to the intake pipe; an outdoor-unit liquid pipe that couples a first refrigerant entry/exit opening of the outdoor heat exchanger and the liquid pipe together; a bypass pipe coupled to the outdoor-unit liquid pipe; a first flow-passage switcher coupled to a second refrigerant entry/exit opening of the outdoor heat exchanger, the discharge pipe, the intake pipe, and the bypass pipe; and a second flow-passage switcher coupled to the gas pipe, the outdoor-unit high-pressure gas pipe, and the outdoor-unit low-pressure gas pipe.