Vertical food cabinet
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vertical food cabinets struggle to maintain food at temperatures above 200°F without causing overcooking, as they often rely on heating methods that either fail to achieve or sustain such high temperatures effectively.
Innovation Solution
A vertical food cabinet design incorporating a closed fluid flow system with a pressure-activated heat transfer medium, where a water/glycol mixture is circulated through metal shelves, utilizing a primary and auxiliary tank with a radiator-type cap to manage pressure and maintain a consistent temperature between 200°F and 250°F, preventing overcooking and ensuring efficient heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If electrically heated air or steam is used to heat food, then the food temperature can be raised above 140°F, but the food becomes overcooked due to excessive heat transfer
Solution Approach 1:
The patent introduces a heat transfer fluid (water/glycol mixture) as an intermediary between the heat source and the food. This fluid circulates through metal shelves that contact the food, providing controlled heat transfer. The intermediary fluid allows precise temperature regulation above 140°F without causing overcooking, as it transfers heat more gently and uniformly compared to direct air heating or steam injection.
Solution Approach 2:
The system changes the physical parameters of heat transfer by using a liquid heat transfer medium instead of gas (air) or vapor (steam). The heat transfer fluid circulates through conduits in the shelves, allowing precise control of temperature parameters. This enables maintaining food at temperatures above 140°F (specifically 140-200°F) without exceeding the threshold that causes overcooking, resolving the contradiction between achieving sufficient heating temperature and preventing harmful overcooking effects.
2Productivity
If the heat transfer medium temperature is increased to cook food faster, then cooking speed increases, but the risk of overcooking increases
Solution Approach 1:
The patent incorporates temperature sensors that continuously monitor the heat transfer medium temperature and provide feedback to the heating control system. This feedback mechanism allows the system to maintain the heat transfer fluid within an optimal temperature range (corresponding to 140-200°F food temperature) and automatically adjust heating to prevent overcooking while enabling faster cooking when needed. The feedback control resolves the contradiction by allowing high productivity operation without exceeding safe temperature thresholds.
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
This design allows for efficient and flexible temperature control, enabling faster cooking and precise holding of food at desired temperatures, while preventing overcooking and ensuring the system remains operational by maintaining the heat transfer medium at optimal levels.
Implementation Method 1
a water/glycol mixture is circulated through metal shelves, utilizing a primary and auxiliary tank with a radiator-type cap to manage pressure and maintain a consistent temperature
Implementation Method 2
a primary and auxiliary tank with a radiator-type cap to manage pressure
Data Source
AI summary
A food cabinet is provided that includes an enclosure with an access door, shelves carried by and vertically arranged within the enclosure, and a heat transfer arrangement. The heat transfer arrangement includes a pump, fluid conduits coupled with the pump and associated with the shelves of the enclosure, a primary tank, and an auxiliary tank. The primary tank is fluidly connected to the pump and contains a heat transfer medium. The auxiliary tank is coupled with the primary tank and provides make-up heat transfer medium to the primary tank. Also provided is a method of warming food using such a food cabinet that includes the steps of placing a food item on one of the shelves, heating the heat transfer medium to a temperature between 200° F. and 250° F., and pumping the heat transfer medium through the shelf.