Thermal-Break Doorframe Cover for Refrigerated Display Cases
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Solution Overview
Problem
Refrigerated display cases often experience condensation on the doorframe and glass due to temperature differences, requiring the doorframe to be maintained at a temperature greater than 58 degrees Fahrenheit, which necessitates significant power usage for heating elements.
Innovation Solution
A refrigerated display case design incorporating a non-metallic frame cover coupled to the doorframe to create a thermal break between the doorframe and the interior volume, reducing heat conduction and migration into the refrigerated space, thereby minimizing condensation and potentially reducing heating element power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If heating elements are used to maintain the doorframe temperature above 58 degrees Fahrenheit, then condensation on the doorframe and glass is reduced, but power consumption increases significantly
Solution Approach 1:
A thermal break material is introduced as an intermediary between the doorframe and the interior volume to reduce heat conduction. This mediator prevents direct thermal contact, allowing the doorframe to be maintained at a higher temperature with less heating power while still preventing condensation.
Solution Approach 2:
The thermal break extracts or removes the direct thermal pathway between the interior cold environment and the doorframe. By taking out the direct conductive connection, the system reduces the heating power needed to maintain doorframe temperature above the dew point.
2Object-affected harmful factors
If the doorframe is maintained at a temperature greater than 58 degrees Fahrenheit, then condensation is minimized, but heat is dissipated into the interior volume increasing energy loss
Solution Approach 1:
The thermal break acts as an intermediary barrier that allows the doorframe to be maintained at a warmer temperature to prevent condensation, while simultaneously blocking the direct heat pathway to the interior volume, thus reducing energy loss.
Solution Approach 2:
The thermal break provides localized thermal insulation at the critical doorframe area. This local quality change allows different parts of the system to have different thermal characteristics - the doorframe remains warm to prevent condensation while the interior remains cold for product storage.
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 thermal break effectively keeps the doorframe warmer without dissipating heat into the interior, reducing condensation and allowing for either reduced power usage or less condensation at existing power settings, enhancing energy efficiency.
Implementation Method 1
a frame cover formed from a non-metallic material and coupled to the bottom member of the doorframe to form a thermal break between the bottom member of the doorframe and the interior volume
Data Source
AI summary
In a refrigerated display case having an interior volume that is accessed through a door panel being opened from a doorframe, a frame cover is included that may reduce condensation or the power required to avoid condensation on a door panel. The frame cover is formed of a non-metallic material that provides a thermal break. The frame cover may also be formed with air pockets to further enhance the thermal break. Moreover, it may be formed to attach with an interference fit and thereby avoid fasteners. Other embodiments and features are presented.