Milk Cooling Compressor Control Using Dual-Temperature Feedback
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Solution Overview
Problem
Existing milk cooling systems react slowly to variations in milk flow, leading to inefficient cooling and increased wear on compressors due to delayed adjustments in cooling capacity.
Innovation Solution
A method and apparatus that measure both the incoming and outgoing coolant temperatures to adjust the number of active compressors in real-time, allowing for faster adaptation to changes in milk flow, thereby optimizing cooling efficiency and reducing compressor wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of compressors is increased based on outgoing coolant temperature, then cooling capacity is improved, but the system reacts slowly to milk flow variations causing delayed cooling response
Solution Approach 1:
The control system performs preliminary action by detecting changes in milk flow rate before the outgoing coolant temperature rises. When an increase in milk flow is detected, the system proactively increases compressor capacity in advance, preventing temperature peaks rather than reacting after they occur. This anticipatory control resolves the contradiction by eliminating the time delay inherent in traditional temperature-based feedback control.
2Productivity
If compressors are frequently activated to maintain cooling temperature, then cooling efficiency is improved, but compressor wear increases
Solution Approach 1:
The system uses dual feedback loops: primary feedback from outgoing coolant temperature ensures cooling efficiency by maintaining appropriate compressor operation, while secondary feedback from incoming milk flow rate provides predictive adjustment. This layered feedback mechanism allows the system to maintain cooling efficiency while reducing unnecessary compressor activations, thereby extending compressor lifespan through more stable operation patterns.
3Speed
If the cooling system operates at full capacity, then cooling speed is improved, but energy consumption increases
Solution Approach 1:
The cooling system implements dynamic capacity adjustment by continuously monitoring incoming milk flow rate and adapting compressor operation accordingly. Instead of operating at fixed full capacity, the system dynamically scales compressor power output to match actual cooling demand, enabling fast cooling when needed while conserving energy during lower flow periods. This dynamic adaptation resolves the contradiction between cooling speed and energy consumption.
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 efficiently adapts to milk flow variations, minimizing temperature peaks and reducing compressor activation frequency, thus enhancing cooling performance and extending compressor lifespan.
Implementation Method 1
a coolant-cooling heat exchanger configured for heat exchange between a refrigerant and the coolant
Implementation Method 2
a milk-cooling heat exchanger configured for heat exchange between milk and the coolant
Implementation Method 3
one or more compressors arranged for compressing the refrigerant in a cool down process of the refrigerant
Data Source
AI summary
An apparatus and method for cooling down milk in a milk cooling apparatus, where the milk cooling apparatus includes a coolant circuit with a milk cooling heat exchanger for heat exchange between milk and the coolant, and also includes a chiller with a refrigerant circuit for heat exchange between a refrigerant and the coolant, where the method includes measuring an OUT-temperature of the coolant upstream of the milk cooling heat exchanger and downstream a coolant cooling heat exchanger, and operating one or more compressors based on the measured OUT-temperature to minimize a difference between the measured OUT-temperature and a desired OUT-temperature, and also measuring an IN-temperature of the coolant upstream the coolant cooling heat exchanger and downstream the milk cooling heat exchanger, where the method configures how many compressors of the one or more compressors being active at a certain OUT-temperature based on the measured IN-temperature.