Refrigeration Cycle Superheater for Enthalpy Difference Control
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Solution Overview
Problem
In refrigeration cycle devices with an accumulator, it is difficult to achieve a large enthalpy difference in the evaporator due to uncontrolled superheat of the refrigerant at the evaporator outlet, which limits cycle performance improvement.
Innovation Solution
The refrigeration cycle device includes a superheater that superheats the gas-phase refrigerant discharged from the accumulator by exchanging heat with a medium hotter than the refrigerant, thereby increasing the enthalpy difference at the low pressure in the evaporator and superheater.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an accumulator is used to separate refrigerant into gas and liquid phases, then refrigerant management is improved, but the enthalpy difference in the evaporator cannot be increased due to uncontrolled superheat
Solution Approach 1:
The device segments the refrigerant flow path by introducing a superheater as a separate component between the accumulator and evaporator. This allows independent control of superheat conditions while maintaining the accumulator's refrigerant management function, thereby resolving the contradiction between reliable refrigerant management and sufficient enthalpy difference in the evaporator.
Solution Approach 2:
The superheater acts as an intermediary device that mediates between the accumulator and evaporator. It controls the superheat of refrigerant before it enters the evaporator, enabling the system to maintain both reliable refrigerant management (through the accumulator) and adequate enthalpy difference (by regulating superheat levels).
2Device complexity
If superheat of refrigerant at evaporator outlet is uncontrolled, then system simplicity is maintained, but cycle performance improvement is limited
Solution Approach 1:
The superheater performs preliminary action by controlling the superheat of refrigerant before it enters the evaporator. This advance control optimizes the refrigerant state for evaporation, thereby improving cycle performance without significantly complicating the overall system architecture.
Solution Approach 2:
The invention changes the thermal parameter (superheat level) of the refrigerant through the superheater before it enters the evaporator. By adjusting this parameter, the system achieves improved cycle performance while maintaining relatively simple system structure, as the superheater integrates into the existing refrigerant flow path.
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 implementation of the superheater in the refrigeration cycle device enhances the cycle performance (COP) by increasing the enthalpy difference, thereby improving the overall efficiency of the refrigeration cycle.
Implementation Method 1
a superheater that superheats the gas-phase refrigerant discharged from the accumulator by exchanging heat with a medium hotter than the refrigerant
Implementation Method 2
An evaporator subsequently evaporates the refrigerant after decompression
Implementation Method 3
The evaporator performs heat exchange with the heat medium to evaporate the refrigerant after it has been decompressed by the decompressor
Implementation Method 4
A radiator dissipates heat from the discharged refrigerant
Implementation Method 5
A decompressor then reduces the pressure of the refrigerant after it has passed through the radiator
Data Source
AI summary
A refrigeration cycle device includes components that manage refrigerant. It has a compressor that draws in and compresses refrigerant, which then passes through a radiator to dissipate heat. A decompressor reduces the refrigerant's pressure before it enters an evaporator, where it evaporates. An accumulator separates the refrigerant into gas and liquid phases and discharges the gas-phase refrigerant. A superheater then superheats this gas-phase refrigerant using a hotter heat medium. The device also features a cooling heat exchanger that cools an object via heat exchange with the heat medium. A heat medium circuit ensures the medium circulates through the evaporator, superheater, and cooling heat exchanger. The evaporator uses the heat medium to evaporate the decompressed refrigerant.