Refrigerating apparatus
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Solution Overview
Problem
Current refrigeration systems lack the ability to dynamically adapt to varying compressor working capacities, leading to suboptimal cooling performance and instability in refrigeration cycles.
Innovation Solution
A refrigeration apparatus with a variable capacity compressor and a configurable expansion device, controlled by a controller that adjusts resistance based on compressor working capacity, ensures a stable refrigeration cycle by maintaining desired evaporating and condensing temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a variable capacity compressor is used to improve cooling performance and adaptability, then the refrigeration system can better adapt to varying cooling demands, but the system becomes more complex and requires dynamic adjustment of the expansion device to maintain stability
Solution Approach 1:
The expansion device is designed with dynamically adjustable resistance that can be modified in real-time based on the compressor's working capacity. The controller continuously monitors compressor capacity and adjusts the expansion device resistance accordingly, transforming a static system into a dynamic one that adapts to varying operating conditions, thereby resolving the contradiction between adaptability and complexity.
Solution Approach 2:
A feedback control mechanism is implemented where the controller receives information about the compressor's working capacity and uses this feedback to adjust the expansion device resistance. This closed-loop control ensures that the expansion device is optimally adapted to the compressor's current state, maintaining system stability while enabling variable capacity operation.
2Device complexity
If the expansion device resistance is fixed, then the device structure is simpler, but the refrigeration cycle becomes unstable when compressor working capacity varies
Solution Approach 1:
The expansion device transitions from a fixed resistance structure to a dynamic resistance structure that can be adjusted in real-time. The resistance value changes based on the compressor's working capacity, ensuring that the refrigeration cycle maintains stability across different operating conditions without requiring an overly complex mechanical structure.
Solution Approach 2:
The resistance parameter of the expansion device is made variable rather than fixed. By changing the resistance parameter dynamically based on compressor capacity, the system maintains refrigeration cycle stability while avoiding the need for complex mechanical adjustments, thus resolving the contradiction between structural simplicity and operational reliability.
3Productivity
If the compressor working capacity is increased to improve cooling output, then more refrigerant is circulated, but the evaporating and condensing temperatures become difficult to maintain at desired levels
Solution Approach 1:
The controller uses feedback from temperature sensors to monitor evaporating and condensing temperatures. When the compressor working capacity is increased, the controller adjusts the expansion device resistance to maintain the desired temperature levels, ensuring that higher cooling output does not compromise temperature control precision.
Solution Approach 2:
The expansion device resistance parameter is dynamically adjusted in response to changes in compressor working capacity. This parameter change allows the system to accommodate higher refrigerant circulation rates while maintaining stable evaporating and condensing temperatures, thus enabling increased productivity without sacrificing temperature control.
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 allows for finer control of the refrigeration cycle, ensuring consistent cooling performance across different compressor capacities and temperatures, enhancing overall cooling efficiency.
Implementation Method 1
the expansion device has a configurable resistance with respect to the refrigerant passing through the expansion device
Implementation Method 2
a compressor, a condenser, an expansion device, and an evaporator, fluidly connected to form a refrigeration cycle for a refrigerant
Implementation Method 3
a condenser... forming a refrigeration cycle for a refrigerant
Implementation Method 4
an evaporator... for refrigerating a fluid
Data Source
AI summary
A refrigeration apparatus including a compressor (301), a condenser (302), an expansion device (304), and an evaporator (305), fluidly connected to form a refrigeration cycle for a refrigerant, wherein the compressor (301) has a variable working capacity, and wherein the expansion device (304) has a configurable flow resistance with respect to the refrigerant passing through the expansion device. The apparatus further includes a controller (300) which is configured to determine a current working capacity of the compressor (301) and to control the resistance of the expansion device (304) in dependence on the current working capacity of the compressor (301). The controller (300) is further configured to control the resistance of the expansion device (304) in order to achieve a mass flow of the refrigerant through the expansion device (304), which mass flow corresponds to a mass flow of the refrigerant through the compressor (301).