Modular Compact Chiller Control for Precise Temperature Sequencing
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Solution Overview
Problem
Conventional refrigeration systems using a single refrigeration cycle are inefficient and lack precise control for modular compact chiller units, leading to suboptimal performance in maintaining temperature setpoints and managing startup and shutdown operations.
Innovation Solution
A controller system for modular compact chiller units that includes a processing circuit for startup, operational, and shutdown control, along with expansion valve and compressor interfaces, allowing for coordinated control of multiple chiller units to meet chilled fluid temperature setpoints and optimize energy usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single refrigeration cycle is used, then the system structure is simple, but the temperature control precision and operational efficiency deteriorate
Solution Approach 1:
The patent divides the single refrigeration cycle into multiple independent modular compact chiller units, each capable of independent operation with its own controller. This segmentation enables precise temperature control for each module while maintaining overall system simplicity through standardized modular design.
2Productivity
If conventional control methods are used, then the device complexity is low, but the startup and shutdown control efficiency deteriorates
Solution Approach 1:
The controller executes preliminary actions during startup by opening the expansion valve to a predetermined position before compressor activation, and performs preliminary shutdown preparation by closing valves in a specific sequence. This preliminary control approach optimizes startup/shutdown efficiency while managing controller complexity through automated sequences.
Solution Approach 2:
The controller dynamically adjusts expansion valve positions during different operational phases (startup, operation, shutdown) rather than using fixed positions. This dynamic control improves startup and shutdown efficiency by adapting valve positions to real-time system conditions.
3Measurement precision
If multiple modular chiller units are used, then the temperature control precision improves, but the coordination control complexity increases
Solution Approach 1:
Each modular compact chiller unit is designed with universal functionality, including identical controllers that can operate independently or in coordination with other modules. This universality simplifies coordination control by ensuring all modules respond similarly to control signals while achieving precise temperature control through collective operation.
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 enables efficient startup and operation of modular compact chiller units, ensuring precise temperature control and reducing energy consumption by activating units sequentially and managing valve positions to maintain optimal refrigerant flow and pressure.
Implementation Method 1
providing a control signal to the expansion valve causing the expansion valve to open to a predetermined position
Implementation Method 2
providing a control signal to a compressor causing the compressor to activate
Implementation Method 3
The heat exchanger is configured to transfer heat from a process fluid
Implementation Method 4
The evaporator portion is configured to transfer heat from the process fluid and evaporate the refrigerant
Data Source
AI summary
A controller for a modular compact chiller unit configured for integration into a refrigeration system utilizing a plurality of modular compact chiller units is shown and described. The controller includes a processing circuit configured to provide startup control, operational control, and shutdown control for the modular compact chiller unit.