Food Holding Cabinet Control for Temperature and Humidity Stability
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Solution Overview
Problem
Existing food holding cabinets suffer from inadequate control of environmental conditions such as temperature, humidity, and airflow, leading to rapid degradation of food quality, bacterial growth, and moisture loss, which limits the holding time and affects the texture, taste, and appearance of food products.
Innovation Solution
A holding cabinet equipped with environmental sensors and controllers that adjust temperature, humidity, and airflow based on real-time readings to maintain specific environmental conditions within predetermined ranges, using a combination of radiant, conduction, and convection heaters, as well as a steam generator, to extend the holding time of food products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high airflow is used to maintain temperature uniformity, then temperature distribution is improved, but moisture content decreases and evaporative cooling increases
Solution Approach 1:
The system dynamically adjusts airflow parameters (velocity, direction, distribution pattern) based on real-time sensor feedback about temperature and humidity conditions. By changing airflow parameters rather than maintaining constant high airflow, the system achieves temperature uniformity while reducing excessive moisture loss and evaporative cooling.
Solution Approach 2:
Environmental sensors continuously monitor temperature and humidity levels, feeding this data back to the controller. The controller then adjusts airflow parameters in response to these measurements, creating a closed-loop system that maintains temperature uniformity while preventing excessive moisture loss by reducing airflow when humidity is adequate.
2Stability of the object's composition
If temperature is maintained at higher levels to preserve food texture, then food quality is improved, but bacterial growth increases
Solution Approach 1:
The system dynamically adjusts temperature levels based on the type of food product being held and the duration of holding. Rather than maintaining a static high temperature, the controller modifies temperature parameters over time - initially higher to preserve texture, then gradually reduced to inhibit bacterial growth as holding time progresses.
Solution Approach 2:
The controller changes temperature parameters in response to sensor feedback and pre-programmed holding schedules. For different food types, the system applies different temperature profiles that balance texture preservation with bacterial growth inhibition, adjusting parameters such as temperature level, humidity, and holding duration.
3Stability of the object's composition
If door openings are minimized to maintain storage conditions, then environmental stability is improved, but operational flexibility decreases
Solution Approach 1:
Environmental sensors detect changes in temperature and humidity caused by door openings and immediately feed this information to the controller. The controller then activates heating or humidifying elements to restore the original environmental conditions, allowing door openings to occur without permanent degradation of storage stability.
Solution Approach 2:
The system anticipates environmental disturbances from door openings by maintaining a buffer of thermal and humidity stability. The controller monitors environmental parameters continuously and prepares compensatory actions (heating, humidifying) that are activated immediately upon detecting door opening events, cushioning against the destabilizing effect of door openings.
4Duration of action of moving object
If multiple environmental parameters are controlled to extend holding time, then food quality is improved, but device complexity increases
Solution Approach 1:
A single controller unit performs multiple functions: it receives input from various environmental sensors (temperature, humidity), processes this information, and controls multiple output devices (heating elements, humidifying elements, airflow controllers). This multi-functional approach extends holding time through coordinated environmental control while minimizing the addition of separate control systems.
Solution Approach 2:
The system combines temperature control, humidity control, and airflow control into an integrated environmental management system. Rather than operating these functions independently, the controller merges their operation, using sensor feedback from all parameters to coordinate adjustments across all control elements, thereby extending holding time while managing overall system complexity.
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 maintains food quality by optimizing environmental conditions, extending the holding time before significant degradation occurs, and allowing for customized settings for different food products, thereby reducing waste and improving profitability.
Implementation Method 1
a radiant heater disposed above the holding compartment
Implementation Method 2
a conduction heater disposed below the holding compartment
Implementation Method 3
a convection heater disposed at an end of the holding compartment
Implementation Method 4
a steam generator in atmospheric communication with the holding compartment and configured to generate steam
Data Source
AI summary
A holding cabinet includes a body defining a holding space and a holding compartment disposed within the holding space for holding a product therein. The holding cabinet further includes a heating source, a steam generator, a temperature sensor, a humidity sensor, a product detector, and a controller. The controller is configured to regulate environmental conditions of the holding compartment according to a determined setpoint, which corresponds to a predetermined temperature and relative humidity. The controller regulates such environmental conditions by acquiring the sensed air temperature, relative humidity, and the detected type of product, and activating and deactivating the heating source and the steam generator in accordance with the acquired air temperature, relative humidity, and the determined setpoint corresponding to the type of product detected and a holding time of the product, to maintain the air temperature and the relative humidity within a predetermined range based on the determined setpoint.