Refrigerator system
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Solution Overview
Problem
In refrigeration systems, achieving effective operation to reduce energy consumption is challenging, particularly in systems with multiple refrigerators connected in series, where optimal control of refrigerant flow and compressor speeds is needed to manage varying load factors efficiently.
Innovation Solution
A refrigeration system comprising an upstream refrigerator with a variable-speed compressor and a downstream refrigerator with a constant-speed compressor, controlled by a higher-level device that adjusts operational modes and load factors based on equipment load thresholds, ensuring efficient operation by optimizing the use of both refrigerators and adjusting their loads to minimize energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If both refrigerators are operated to handle high load factors, then the system can meet high cooling demands, but energy consumption increases
Solution Approach 1:
The upstream refrigerator uses a variable-speed compressor that dynamically adjusts its operation based on the equipment load factor, allowing the system to optimize energy consumption while meeting varying cooling demands. The compressor speed is controlled to match the actual load requirements rather than operating at constant speed.
Solution Approach 2:
The refrigeration system is divided into two independent refrigerators (upstream and downstream) that can operate independently or together. The control device segments the load handling by deciding when to operate only the upstream refrigerator versus when to activate both refrigerators based on the equipment load factor thresholds.
2Use of energy by moving object
If only the upstream refrigerator is operated to reduce energy consumption, then energy efficiency improves, but the system cannot meet high cooling demands
Solution Approach 1:
The variable-speed compressor in the upstream refrigerator can dynamically increase its capacity to handle higher loads when needed, reducing the need to activate the downstream refrigerator for moderate load conditions and thereby optimizing energy consumption while maintaining cooling capacity.
3Device complexity
If the upstream refrigerator handles all loads independently, then system complexity is reduced, but load distribution efficiency decreases
Solution Approach 1:
The system is segmented into two refrigerators with a higher-level control device that independently manages each unit. This segmentation allows efficient load distribution by activating only the necessary refrigerator(s) based on load conditions, improving productivity while keeping control logic relatively simple through threshold-based decision making.
4Productivity
If the downstream refrigerator is activated at low load factors, then cooling capacity is ensured, but energy consumption increases unnecessarily
Solution Approach 1:
The variable-speed compressor in the upstream refrigerator dynamically adjusts its capacity to meet cooling demands at low to moderate load factors, eliminating the need to activate the downstream refrigerator unnecessarily and thereby reducing energy consumption while ensuring adequate cooling capacity.
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 effectively reduces power consumption and operational costs by dynamically managing the operation and load distribution between the upstream and downstream refrigerators, improving efficiency and reducing energy usage based on changing load conditions.
Implementation Method 1
a first compressor which compresses a refrigerant
Implementation Method 2
a first condenser which condenses the refrigerant compressed by the first compressor
Implementation Method 3
the first condenser performs heat exchange between the cooling water which passes through the second condenser and the refrigerant
Implementation Method 4
a first evaporator which evaporates the refrigerant condensed by the first condenser to cool cold water
Implementation Method 5
a first evaporator which evaporates the refrigerant condensed by the first condenser to cool cold water
Implementation Method 6
a second compressor which compresses a refrigerant
Implementation Method 7
a second condenser which condenses the refrigerant compressed by the second compressor
Implementation Method 8
the second condenser performs heat exchange between supplied cooling water and the refrigerant
Implementation Method 9
a second evaporator which evaporates the refrigerant condensed by the second condenser to cool cold water which passes through the first evaporator
Implementation Method 10
a second evaporator which evaporates the refrigerant condensed by the second condenser to cool cold water which passes through the first evaporator
Data Source
AI summary
Provided is a refrigerator system with which refrigerators can be operated efficiently. This refrigerator system has: an upstream refrigerator having a first compressor that compresses a refrigerant, a first condenser that condenses the refrigerant compressed by the first compressor, and a first evaporator that evaporates the refrigerant condensed by the first condenser and cools cold water; a downstream refrigerator having a second compressor that compresses a refrigerant, a second condenser that condenses the refrigerant compressed by the second compressor, and a second evaporator that evaporates the refrigerant condensed by the second condenser and cools the cold water that has passed through the first evaporator; and a higher-level control device that controls the operation of the upstream refrigerator and the downstream refrigerator. The first compressor is a variable-speed device, and the second compressor is a constant-speed device.