Refrigeration System and Refrigerated Storage
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Solution Overview
Problem
Current refrigeration systems face issues with high compressor pressure ratio, reduced refrigeration coefficient, and high exhaust temperature, leading to low energy efficiency in refrigerated storage, particularly in low-temperature applications.
Innovation Solution
A refrigeration system with at least two sets of refrigerant compression devices and a flow path switching valve set that allows for alternative or series supply of refrigerants to the evaporation device, enabling different compression ratios and operation modes to optimize compressor efficiency and energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a low-temperature compressor is used to refrigerate the freezing room, then the refrigeration temperature can be reduced to -18°C, but the compressor pressure ratio increases, leading to reduced volume efficiency and high exhaust temperature
Solution Approach 1:
The single-stage compression process is divided into two stages: a first compressor performs low-temperature compression to achieve -18°C refrigeration, and a second compressor performs intermediate-temperature compression. This segmentation allows each compressor to operate at optimized pressure ratios, improving overall volume efficiency while achieving the required low temperature
Solution Approach 2:
A liquid-suction heat exchanger is introduced as an intermediary component between the two compressors. It recovers heat from the high-temperature discharge of the first compressor and uses it to pre-cool the suction gas of the second compressor, thereby reducing the second compressor's discharge temperature and improving system efficiency
2Temperature
If a low-temperature compressor operates at high pressure ratio, then low-temperature refrigeration is achieved, but the refrigeration coefficient decreases and energy efficiency is reduced
Solution Approach 1:
The compression process is segmented into two stages with different pressure ratios. The first compressor handles the high-pressure-ratio low-temperature compression, while the second compressor handles intermediate-temperature compression with a lower pressure ratio. This segmentation optimizes the refrigeration coefficient by avoiding excessive pressure ratios in a single stage
Solution Approach 2:
The liquid-suction heat exchanger acts as a thermal intermediary that recovers waste heat from the first compressor's discharge and transfers it to the second compressor's suction line, reducing the energy input required by the second compressor and improving overall refrigeration coefficient
3Device complexity
If fixed compression ratio compressors are used, then system structure is simple, but the system cannot adapt to different storage temperature requirements
Solution Approach 1:
The system incorporates dynamic control through electronic expansion valves and a control unit that can adjust the operation of different compressors based on real-time temperature requirements. This allows the system to adapt between freezing and refrigeration modes while maintaining a relatively simple physical structure
Solution Approach 2:
The dual-compressor configuration with shared heat exchangers and evaporators creates a multi-functional system that can operate in different modes (freezing, refrigeration, or combined) by controlling which compressors are active, thereby achieving temperature adaptability without proportionally increasing structural complexity
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 improves volume efficiency and energy efficiency by reducing pressure ratios and allowing for flexible operation based on storage temperatures, achieving double-temperature high-efficiency refrigeration.
Implementation Method 1
each of the refrigerant compression devices is configured to compress a refrigerant
Implementation Method 2
supply a refrigerant to the refrigerant evaporation device
Data Source
AI summary
The present disclosure provides a refrigeration system and a refrigerated storage including the same, relating to the technical field of refrigeration equipment, and solving the technical problems of a high compressor pressure ratio, a reduced refrigeration coefficient and a high exhaust temperature in a refrigerated storage. The refrigeration system includes at least two sets of refrigerant compression devices, a refrigerant evaporation device and a flow path switching valve set, wherein all the refrigerant compression devices are fluidly connected to the flow path switching valve set; the flow path switching valve set is configured to control the refrigerant compression devices by switching the flow path switching valve set to supply a refrigerant to a refrigerant evaporation in an alternative manner or in series. According to the technical solution provided by the present disclosure, double-temperature high-efficiency refrigeration is achieved, and the energy efficiency of the refrigeration system is improved.