Baffled Airflow Holding Cabinet for Uniform Food Heating
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Solution Overview
Problem
Existing holding cabinets for cooked food lack efficient air flow and heat distribution mechanisms, leading to inconsistent warming and energy inefficiency in maintaining food at the desired temperature before presentation or further processing.
Innovation Solution
A holding cabinet with a vertically stacked arrangement of receiving cavities and an air flow compartment that includes a heat treatment portion, inlet portion, and return portion, utilizing baffles to direct air flow and heating pads for conduction, convection, and radiant heat transfer, ensuring uniform heating and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heating mechanisms are used in holding cabinets, then food can be warmed, but heat distribution is inconsistent and energy efficiency is poor
Solution Approach 1:
The holding cabinet is divided into multiple receiving cavities (first and second cavities) with separate heating zones. Each cavity has its own heating elements and air flow paths, allowing independent temperature control and optimization for different food types, thereby improving both temperature uniformity and energy efficiency.
Solution Approach 2:
Different regions of the holding cabinet are equipped with different heating mechanisms tailored to their specific needs. The first cavity uses convection heating with overhead elements, while the second cavity uses conduction heating with floor-mounted elements. This localized approach ensures optimal temperature distribution in each zone while minimizing energy waste.
2Use of energy by stationary object
If simple heating elements are used, then the device structure remains simple, but air flow and heat distribution are inefficient
Solution Approach 1:
The patent employs forced air convection using fans to circulate heated air through the receiving cavities. The air flow system includes supply ducts, return ducts, and adjustable air distribution outlets that direct hot air onto the food surfaces. This pneumatic approach significantly enhances heating efficiency compared to simple radiant heaters while the modular duct design keeps the overall structure manageable.
Solution Approach 2:
The patent introduces air as an intermediary medium to transfer heat from the heating elements to the food. The forced air circulation system acts as a mediator that distributes thermal energy uniformly throughout the cavities, improving heating efficiency without requiring direct contact between heating elements and food, thus maintaining reasonable structural complexity.
3Reliability
If multiple heating zones are implemented, then temperature control is improved, but the device structure becomes more complex
Solution Approach 1:
The holding cabinet design incorporates multiple receiving cavities that can serve different functions - one optimized for hot holding with convection heating and another for warm holding with conduction heating. Each cavity is a self-contained module with its own heating elements, air flow system, and insulation, allowing independent operation and maintenance. This modular universal design improves temperature control reliability while managing structural complexity through standardization.
4Power
If forced air convection is used, then heat transfer efficiency is improved, but energy loss increases
Solution Approach 1:
The holding cabinet employs composite insulation materials with high thermal resistance values in the walls, ceiling, and floor of the receiving cavities. The insulation layers are designed with multiple materials having different thermal properties to minimize heat loss while maintaining structural integrity. This composite insulation approach reduces energy loss from forced air convection by maintaining higher internal temperatures with less energy input.
Solution Approach 2:
The patent incorporates heat recovery mechanisms where exhaust air from the receiving cavities is redirected through heat exchangers to pre-heat the incoming fresh air or to maintain temperature in less active zones. This recovery system captures waste thermal energy and reintroduces it to the system, significantly reducing overall energy loss while maintaining high heat transfer efficiency in the active heating zones.
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 provides consistent and efficient warming of food through balanced air flow and multi-modal heat transfer, maintaining food at the desired temperature while optimizing energy use and promoting heat transfer efficiency.
Implementation Method 1
heating pads for conduction, convection, and radiant heat transfer
Implementation Method 2
heating pads for conduction, convection, and radiant heat transfer
Implementation Method 3
heating pads for conduction, convection, and radiant heat transfer
Data Source
AI summary
An holding cabinet is provided. The cabinet encloses first and second cavities and an includes an airflow system for convection heating. The cabinet also includes conductive and radiant heating of food therein. The cabinet includes a baffled flow path to provide even heated air flow through each of the first and second cavities.