High Pressure Vessel Temperature Control via Adiabatic Compensation
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Solution Overview
Problem
High pressure processing systems face limitations in achieving desired temperature ranges for products, particularly for applications requiring higher temperatures than the traditional low-temperature processing, which can affect microbial inactivation and compliance with regulatory heat treatment requirements.
Innovation Solution
Incorporating heating and cooling systems within the pressure vessel, controlled by temperature sensors and a controller, to manage adiabatic temperature rises and maintain processing temperatures within specific ranges, allowing for both high-pressure and controlled temperature treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high pressure processing is used to reduce microbial load, then microbial inactivation is achieved, but temperature control becomes difficult due to adiabatic temperature rise
Solution Approach 1:
The system pre-cools the pressure media before high-pressure processing to compensate for the anticipated adiabatic temperature rise. Temperature sensors continuously monitor the media temperature, and the system adjusts the pre-cooling level based on predicted temperature changes during pressurization, ensuring the temperature remains within the desired range throughout the process.
Solution Approach 2:
Temperature sensors are installed within the pressure vessel to provide real-time feedback on the temperature of the pressure media and processed materials. This feedback is fed to a controller that automatically adjusts the heating or cooling systems to maintain the temperature within the specified range, counteracting the adiabatic temperature rise during high-pressure processing.
2Reliability
If higher temperatures are applied for regulatory compliance, then heat treatment requirements are met, but product quality may deteriorate
Solution Approach 1:
The system precisely controls temperature as a process parameter, maintaining it within a narrow optimal range that satisfies regulatory heat treatment requirements while preventing excessive temperature that would degrade product quality. The controller adjusts heating and cooling based on real-time sensor feedback to achieve this precise parameter control.
Solution Approach 2:
The temperature control systems (heating and cooling) operate continuously throughout the high-pressure processing cycle, ensuring that the temperature remains constantly within the desired range. This continuous control prevents temperature excursions that could compromise product quality while maintaining regulatory compliance throughout the entire processing duration.
3Stability of the object's composition
If traditional low temperature processing is used, then product quality is preserved, but regulatory heat treatment requirements are not met
Solution Approach 1:
The pressure vessel system is designed with multi-functional temperature control capabilities, incorporating both heating and cooling systems that can operate in conjunction with high-pressure processing. This allows the same system to maintain low temperatures for quality preservation while also achieving the heat treatment temperatures required for regulatory compliance, making the system universally applicable to different processing requirements.
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
Enables precise temperature control during high-pressure processing, achieving microbial inactivation while maintaining product quality and compliance with temperature regulations, as demonstrated in applications like dairy products and sterilization processes.
Implementation Method 1
When applying such pressure the water experiences an adiabatic temperature rise of about 3° C. per 1,000 bar
Implementation Method 2
the pressure vessel is equipped with one or more heating and cooling systems in order to control the temperature range
Implementation Method 3
the pressure vessel is equipped with one or more heating and cooling systems in order to control the temperature range
Data Source
AI summary
A high pressure processing system includes a pressure vessel configured to receive a basket or container, a high pressure pump configured to pump a pressure media to the pressure vessel to raise pressure in the pressure vessel, and a heater or cooler system, such as thermal jacket surrounding the pressure vessel, and the thermal jacket contains heat transfer media that is heated and cooled. The high pressure processing system, in addition to processing food stuff at a very high pressure of at least 2,000 bar also processes the food stuff at any high temperature of about 40° C. or greater.