Outdoor unit and control method thereof
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Solution Overview
Problem
The existing refrigeration systems face challenges in reducing discharge temperature without increasing the bypass of refrigerant through the supercooler, which can lead to reduced refrigerating performance and efficiency, especially under high outdoor temperatures.
Innovation Solution
An outdoor unit with a low pressure side compressor, a high pressure side compressor, a heat recovery unit, and a supercooler, along with bypass and injection valves, which measure discharge temperatures to control the flow of refrigerant and reduce discharge temperatures by guiding expanded refrigerant back to the compressors through sensors and valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the supercooling performance of the supercooler is increased under high outdoor temperature, then the discharge temperature is reduced, but the bypass amount of refrigerant through the supercooler becomes larger, reducing refrigerating performance and system efficiency
Solution Approach 1:
The patent divides the single compressor function into two separate compressors: a first compressor for basic compression and a second compressor for re-compression of the refrigerant. This segmentation allows independent control of compression stages, enabling discharge temperature reduction without excessive refrigerant bypass, thereby resolving the contradiction between temperature control and system efficiency
Solution Approach 2:
The patent introduces a supercooler as an intermediary component between the first and second compressors. The supercooler cools the refrigerant before it enters the second compressor, allowing the second compressor to handle the refrigerant at lower temperatures. This intermediary approach enables effective discharge temperature control while maintaining proper refrigerant flow distribution, preventing the need for excessive bypass that would reduce system efficiency
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 solution effectively reduces discharge temperatures of both compressors without reducing the refrigerant flow into the refrigerator, improving cycle efficiency and refrigerating performance even under high outdoor temperatures.
Implementation Method 1
a low pressure side compressor for compressing a refrigerant
Implementation Method 2
a high pressure side compressor for compressing the refrigerant compressed by the low pressure side compressor
Implementation Method 3
an outdoor heat exchanger for condensing the refrigerant compressed by the high pressure side compressor
Implementation Method 4
a heat recovery unit for cooling the refrigerant condensed in the outdoor heat exchanger by exchanging heat with the refrigerant evaporated in the air conditioner
Implementation Method 5
a supercooling expansion valve for expanding a part of the refrigerant cooled in the heat recovery unit
Implementation Method 6
a supercooling heat exchanger for cooling another part of the refrigerant cooled in the heat recovery unit by exchanging heat with the refrigerant expanded in the supercooling expansion valve
Data Source
AI summary
An outdoor unit is connected to a refrigerator and has two compressors that are connected in series, and a control method thereof. The outdoor unit according to an embodiment of the present invention includes a low pressure side compressor for compressing a refrigerant; a high pressure side compressor for compressing the refrigerant compressed by the low pressure side compressor; an outdoor heat exchanger for condensing the refrigerant compressed by the high pressure side compressor; a heat recovery unit for cooling the refrigerant condensed in the outdoor heat exchanger by exchanging heat with the refrigerant evaporated in the air conditioner; and a supercooler for expanding a part of the refrigerant cooled in the heat recovery unit to cool another part of the refrigerant cooled in the heat recovery unit, so that the discharge temperature of the low pressure side compressor and/or the high pressure side compressor can be reduced.