Multi-Air Conditioner Heat Exchanger Layout for Continuous Heating
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Solution Overview
Problem
Conventional multi-air conditioners face challenges in efficiently managing refrigerant flow and pressure, leading to issues such as refrigerant remaining in high-pressure gas pipelines, inadequate continuous heating or cooling operations, and potential freezing of indoor units due to temperature imbalances.
Innovation Solution
A multi-layered heat exchanger structure within a single outdoor unit, comprising a first, second, and third heat exchanger, with varying flow path lengths and capacities, and a controller to selectively couple or decouple these heat exchangers based on indoor and outdoor conditions, optimizing refrigerant distribution and preventing excessive refrigerant leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional multi-air conditioner uses a single outdoor unit with standard heat exchanger configuration, then the system structure is simple, but refrigerant remains in high-pressure gas pipelines when all rooms need cooling, reducing system efficiency
Solution Approach 1:
The outdoor heat exchanger is divided into multiple independent heat exchangers (first heat exchanger, second heat exchanger, third heat exchanger) with different flow path lengths and capacities. This segmentation allows selective operation of individual heat exchangers based on cooling load requirements, enabling the system to efficiently handle full-cooling scenarios by operating multiple heat exchangers in parallel while maintaining simple overall system architecture.
2Ease of operation
If the air conditioner uses fixed heat exchanger configuration, then the system is easy to operate, but it cannot perform continuous heating or cooling operations under varying temperature and load conditions
Solution Approach 1:
The system incorporates a controller that dynamically selects and couples specific heat exchangers based on real-time operating conditions including indoor/outdoor temperatures and cooling/heating loads. This dynamic configuration allows the system to adapt to varying conditions and perform continuous operations, while the automated control maintains ease of operation without requiring manual intervention.
Solution Approach 2:
The outdoor unit is designed with multiple heat exchangers that can be selectively coupled to serve different functions: the first heat exchanger for high-capacity cooling, the second heat exchanger for low-capacity cooling, and the third heat exchanger for heating operations. This multi-functionality enables continuous operation under various conditions while the unified control system maintains operational simplicity.
3Productivity
If refrigerant temperature is dropped too low for cooling operation, then cooling efficiency is improved, but the indoor unit may freeze
Solution Approach 1:
The system provides different refrigerant temperatures to different indoor units by selectively coupling heat exchangers based on specific conditions. When outdoor temperature is low and cooling load is high, the first heat exchanger is coupled to provide adequate refrigerant temperature. When outdoor temperature is high and cooling load is low, the second heat exchanger is coupled to provide lower refrigerant temperature for improved efficiency. This local quality approach ensures each indoor unit receives appropriately temperature-adjusted refrigerant, improving cooling efficiency while preventing freezing.
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 solution enables efficient operation by optimizing heat exchange based on load and temperature conditions, minimizing refrigerant leakage, and ensuring continuous heating or cooling operations, even under varying temperature and humidity conditions.
Implementation Method 1
an outdoor heat exchanger that exchanges circulating refrigerant with outdoor air
Implementation Method 2
an indoor heat exchanger that exchanges heat between circulating refrigerant and indoor air
Implementation Method 3
a compressor that compresses a low-temperature, low-pressure gas refrigerant into a high temperature and high pressure
Implementation Method 4
Refrigerant expanded in the expansion mechanism is introduced into the indoor heat exchanger and evaporates as it absorbs heat from indoor air
Implementation Method 5
refrigerant passing through the outdoor heat exchanger is condensed through heat exchange with ambient air
Data Source
AI summary
A multi-air conditioner for heating and cooling may include at least one indoor unit for both cooling and heating including an indoor heat exchanger, an outdoor unit, and a distributor disposed between the outdoor unit and the at least one indoor unit. The outdoor unit may include a compressor, a plurality of outdoor heat exchangers, and a switching unit disposed on a discharge side of the compressor to switch a flow of refrigerant. The plurality of outdoor heat exchangers may include a first heat exchanger, a second heat exchanger disposed under the first heat exchanger, and a third heat exchanger disposed under the second heat exchanger. A first end of the third heat exchanger may be connected to the discharge side of the compressor, and a second end of the third heat exchanger may be connected to the indoor unit.