Heated display cabinet
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Solution Overview
Problem
Existing food display cabinets lack efficient temperature control and air circulation systems, leading to inconsistent product preservation and exposure to external contaminants.
Innovation Solution
A heated display cabinet with a housing that includes shelves with conduction heaters and a heating assembly comprising a fan, heating element, and sensors, where air flows through a roof with apertures directing air downward to create an air curtain for temperature control and contamination prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional display cabinets are used without advanced heating systems, then the device complexity is low, but the temperature control consistency deteriorates
Solution Approach 1:
The heating system is divided into multiple independent heating zones, each with its own heating element and temperature control. Each shelf or section can be heated independently, allowing precise temperature control in different areas of the cabinet while maintaining overall system manageability
Solution Approach 2:
Different regions of the cabinet are equipped with heating elements tailored to their specific requirements. The heating intensity and control parameters are optimized for each local zone, ensuring consistent temperature control throughout the cabinet while avoiding uniform overheating or underheating
2Ease of operation
If open front design is used for customer access, then the ease of operation is improved, but the exposure to external contaminants worsens
Solution Approach 1:
An air curtain generated by the fan system acts as an intermediary barrier between the cabinet interior and the external environment. This visible air flow prevents contaminants from entering while allowing customers to freely access products through the open front, maintaining both protection and accessibility
Solution Approach 2:
The cabinet uses pressurized air flow from the fan system to create a protective barrier. The pneumatic air curtain dynamically seals the open front area, preventing contaminant intrusion while maintaining customer access capability
3Temperature
If conduction heaters are added to each shelf, then the temperature distribution is improved, but the energy consumption increases
Solution Approach 1:
Heating is applied locally at each shelf level where it is actually needed, rather than heating the entire cabinet volume uniformly. This localized approach improves temperature distribution across different shelf levels while minimizing energy consumption by avoiding heating of empty or already-warm zones
Solution Approach 2:
The heating system dynamically adjusts the operation of individual heating elements based on real-time temperature sensor feedback. Each heating zone can be independently activated or deactivated, optimizing energy consumption by applying heat only where and when required to maintain target temperatures
4Object-affected harmful factors
If fan and heating element are added for air circulation, then the contamination prevention is improved, but the device complexity worsens
Solution Approach 1:
The fan system serves multiple functions simultaneously: it generates the air curtain for contamination prevention, provides air circulation for temperature uniformity, and supports the operation of heating elements by distributing heated air. This multi-functionality reduces the need for separate dedicated systems for each function
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
Maintains consistent temperature and prevents external contaminants, ensuring optimal product preservation and display.
Implementation Method 1
a conduction heater disposed on the shelf that adds heat to a top surface of the shelf
Implementation Method 2
a heating element... that directs heated air onto the shelf
Implementation Method 3
a fan... that draws air through the air flow path and directs the air flow onto the shelf
Implementation Method 4
a fan... that draws air through the air flow path and directs the air flow onto the shelf
Data Source
AI summary
A cabinet to hold and display a plurality of food items is provided. The cabinet includes a plurality of shelves that each include holding volumes that are accessible via an open front of the cabinet. The cabinet establishes a separate and dedicated air curtain across the opening into each holding volume and the temperature of the air forming each holding volume is separately controlled. Each shelf includes a digital display that can be controlled to display various parameters of the contents of the specific shelves or other material.