Mobile Heated Cabinet Air Circulation for Uniform Food Holding
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Solution Overview
Problem
Heated cabinets used in the food service industry face temperature stratification issues when moved from a stationary location, as existing fans do not uniformly distribute heat, leading to heat loss and potential food safety and quality issues due to the disconnection from external power sources.
Innovation Solution
A mobile heated cabinet design that includes an electric-powered heating device and air circulating device, with a self-contained power source for the air circulating device, allowing continuous air circulation whether connected to or disconnected from an external power source, using a rechargeable battery to power the fan and temperature sensors to maintain uniform temperatures during transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fans are installed near electric heating elements to force air movement and heat the air, then heated air can be guided into the food storage area, but temperature stratification occurs and heated air is not uniformly distributed throughout the cabinet
Solution Approach 1:
The cabinet interior is divided into multiple air circulation zones with separate fans positioned at different locations (front, rear, and optionally side walls). Each fan serves a specific zone, ensuring comprehensive and uniform air distribution throughout the entire food storage area, eliminating temperature stratification.
Solution Approach 2:
Fans are strategically positioned at specific locations within the cabinet (front wall, rear wall, and optionally side walls) to create localized air circulation patterns. Each fan is optimized for its specific zone, with adjustable speeds to achieve uniform temperature distribution across different regions of the cabinet.
2Reliability
If electric heating elements and fans are used to maintain temperature, then food can be kept at certain temperatures, but the cabinet requires continuous connection to external power sources
Solution Approach 1:
A rechargeable battery pack is integrated into the cabinet to store electrical energy in advance. This allows the heating elements and fans to operate continuously during transportation without requiring connection to external power sources, maintaining temperature reliability while enabling mobile operation.
3Adaptability or versatility
If the cabinet is moved from a stationary location to transport food, then mobility is achieved, but power supply is disconnected causing heat loss and temperature stratification
Solution Approach 1:
The rechargeable battery is charged in advance at the stationary location before transport. During movement, the battery automatically powers the heating elements and fans to maintain temperature stability, ensuring continuous operation regardless of external power availability.
Solution Approach 2:
The system dynamically adapts its power source based on operational mode: external power supply is used during stationary operation, while the rechargeable battery automatically takes over during transportation. This dynamic power switching ensures temperature stability across different operational states.
4Temperature
If multiple fans are installed to improve air circulation, then temperature distribution improves, but power consumption and device complexity increase
Solution Approach 1:
The system uses multiple fans operating at adjustable speeds, allowing partial operation when full circulation is not needed. During transportation or when temperature uniformity requirements are lower, fans can operate at reduced speeds or with fewer units active, reducing power consumption while maintaining adequate temperature distribution.
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 solution effectively mitigates temperature stratification within the cabinet, ensuring food safety and quality by maintaining uniform temperatures during both stationary storage and transportation, preventing heat accumulation at the top of the cabinet.
Implementation Method 1
Electric heating elements are provided in heated cabinets to warm food stored therein
Implementation Method 2
fans can be installed near an electric heating element. The fans are provided to force air to move over the electric heating element in order to heat the air and guide the heated air into a food storage area
Implementation Method 3
providing a self-contained source of electrical power associated with the cabinet for the air circulating device for use when the cabinet is performing the storing and transporting function
Data Source
AI summary
A mobile heated cabinet and method of mitigating stratification of temperature within the interior of the mobile heated cabinet are disclosed, wherein the mobile heated cabinet can be used to both (a) store food at a stationary location and (b) store and transport food when moved from the stationary location. The disclosed mobile heated cabinet and method mitigate stratification of temperature by providing a heating device, an air circulating device, an external power source, and a self-contained power source.