Refrigeration system and a method for regulating a refrigeration system
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Solution Overview
Problem
Conventional refrigeration systems lack efficiency in controlling evaporation temperature and pressure, which affects the overall performance of the refrigeration circuit, particularly in maintaining optimal operating states for maximum ejector efficiency.
Innovation Solution
A refrigeration system with a control device that regulates the refrigerant's state in the collection tank based on a predetermined pressure or temperature ratio between the tank and the evaporator, optimizing the ejector's operation by adjusting the compressor's output and mass flow to achieve maximum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional controllers track evaporation temperature and pressure with upper limits, then the refrigeration point temperature can be achieved, but the ejector efficiency is not maximized and overall system efficiency is reduced
Solution Approach 1:
The control device changes the control parameter from simple evaporation temperature/pressure tracking to a predetermined pressure ratio relationship between the collecting tank and evaporator. This parameter transformation allows the system to simultaneously achieve reliable refrigeration temperatures while maximizing ejector efficiency, as the pressure ratio directly influences ejector performance
Solution Approach 2:
The control device implements a feedback mechanism that continuously monitors the pressure ratio between the collecting tank and evaporator, and adjusts the refrigeration circuit operation accordingly. This closed-loop control ensures that the predetermined pressure ratio relationship is maintained, optimizing ejector efficiency while achieving the required refrigeration temperatures
2Ease of operation
If the evaporation temperature is strictly limited by upper limit controllers, then temperature control is simple, but the system cannot achieve optimal operating states for maximum ejector work
Solution Approach 1:
The invention transforms the control approach by changing from direct temperature control to pressure ratio control. The predetermined pressure ratio relationship serves as a new control parameter that inherently guides the system toward optimal ejector operating conditions, maintaining ease of operation while maximizing ejector work output
Solution Approach 2:
The control device pre-establishes the optimal pressure ratio relationship between the collecting tank and evaporator before operation begins. This preliminary configuration ensures that the system operates in the optimal state for ejector work from the start, eliminating the need for complex real-time temperature adjustments
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 approach allows for stable and efficient control of the refrigeration circuit, maximizing ejector work and overall system efficiency by maintaining optimal refrigerant conditions, thereby improving the refrigeration process.
Implementation Method 1
at least one evaporator (12), which is designed in such a way that it vaporizes a liquid portion of the refrigerant in the collecting tank (11) that is fed to it
Implementation Method 2
at least one evaporator (12), which is designed in such a way that it vaporizes a liquid portion of the refrigerant
Implementation Method 3
at least one first compressor (13), which is designed in such a way that it sucks in and compresses a gaseous portion of the refrigerant in the collection container
Implementation Method 4
at least one ejector (15) downstream of the condenser or gas cooler (14) with a respective suction connection (16) which is connected to an outlet of the at least one evaporator (12)
Data Source
Figure 1~2
AI summary
A refrigeration system for operating a refrigeration circuit with a refrigerant comprises a collecting tank for collecting refrigerant, at least one evaporator, which is designed in such a way that it evaporates a liquid portion of the refrigerant in the collecting tank that is supplied to it, at least a first compressor, which is designed in such a way that it sucks in and compresses a gaseous portion of the refrigerant in the collection container, a condenser or gas cooler downstream of the at least one first compressor, at least one ejector downstream of the condenser or gas cooler with a respective suction connection which is connected to an outlet of the at least one evaporator, wherein the at least one ejector is designed in such a way that it supplies the coolant obtained from the condenser or gas cooler and the coolant sucked in by the at least one evaporator via the suction connection to the collection container, and a controller direction for regulating the operation of the refrigeration circuit. The control device is designed in such a way that it controls the operation of the refrigeration circuit on the basis of a predetermined relationship between the state of the refrigerant in the collection container and the state of the refrigerant downstream of the at least one evaporator.