Cascade Heat Pump Compressor Bypass for Higher Compression Ratio
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Solution Overview
Problem
Cascade heat pumps face reduced efficiency due to decreased compression ratio when using a single compressor for both refrigerant cycles, leading to increased power consumption.
Innovation Solution
Implementing a cascade heat pump system with a first and second refrigerant cycle, where the second refrigerant is compressed in two stages using both the second compressor and the first compressor, with a flow rate regulating part to control the flow direction and bypass the first compressor, allowing for high compression ratios and improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one compressor is used to compress the refrigerant circulating in the refrigerant cycle, then the device complexity is reduced, but the compression ratio decreases and efficiency is reduced
Solution Approach 1:
The patent divides the compression function into two separate compressors: a first compressor for the first refrigerant cycle and a second compressor for the second refrigerant cycle. This segmentation allows each compressor to be optimized for its specific refrigerant and operating conditions, thereby improving compression ratio and efficiency while maintaining manageable system complexity through modular architecture.
2Device complexity
If one compressor is used to compress the refrigerant circulating in the refrigerant cycle, then the device complexity is reduced, but the power consumption increases
Solution Approach 1:
The patent segments the compression system into two independent compressors, each optimized for specific refrigerant cycles. This allows for more efficient compression processes tailored to each refrigerant's properties, reducing overall power consumption compared to a single通用 compressor that must handle both cycles with compromised efficiency.
Solution Approach 2:
The first compressor is designed with multi-functionality to handle both the first refrigerant cycle and assist in compressing the second refrigerant. This universal capability allows the system to optimize power consumption by routing refrigerant flows dynamically, ensuring that each compressor operates in its most efficient range under different operating conditions.
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 enhances the compression ratio and reduces power consumption by optimizing refrigerant flow and compression, especially during high external temperatures, thereby improving the overall efficiency of the heat pump system.
Implementation Method 1
a first refrigerant cycle in which a first refrigerant circulates and a second refrigerant cycle in which a second refrigerant circulates to heat-exchange the first refrigerant with the second refrigerant through a refrigerant heat exchanger
Implementation Method 2
an evaporator for evaporating the refrigerant expanded by the expander
Implementation Method 3
a condenser for condensing the refrigerant discharged from the compressor
Data Source
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AI summary
Provided is a cascade heat pump. The cascade heat pump includes a first refrigerant cycle including a first compressor and a first indoor heat exchanger, a second refrigerant cycle including a second compressor and a second indoor heat exchanger, an outdoor heat exchanger in which a refrigerant compressed in the first compressor or the second compressor is condensed, a bypass tube allowing the refrigerant compressed in the second compressor to bypass the first compressor, thereby flowing into a discharge side of the first compressor, and a first flow rate regulating part disposed on a discharge side of the second compressor to introduce the refrigerant discharged from the second compressor into one of the first compressor and the bypass tube.