Door Icemaker Heat Exchanger Layout for Low-Energy Refrigerator Cooling
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Solution Overview
Problem
In 'bottom freezer' type refrigerators, providing adequate cooling to the icemaker sub-compartment on the door for the fresh food compartment while minimizing energy consumption and manufacturing costs is challenging due to the need for ducts or liquid coolant circulation, which complicates maintenance and increases energy usage.
Innovation Solution
A refrigerator design featuring a heat exchanger with a serpentine portion of the refrigeration system embedded in the sidewall of the fresh food compartment, coupled with a heat-exchanging plate and gasket to seal the sub-compartment, allowing efficient cooling of the icemaker without the need for extensive ducts or liquid coolant circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a duct loop is used to circulate cold air from the freezer compartment to cool the icemaker sub-compartment, then the icemaker can be maintained at freezing temperature, but the duct reduces insulation thickness and increases energy consumption
Solution Approach 1:
The invention extracts the cooling function from the main freezer compartment by providing a dedicated cooling source (evaporator) within the icemaker sub-compartment itself. This eliminates the need for duct loops that would otherwise be required to transport cold air from the freezer, thereby preserving insulation integrity and reducing energy consumption while maintaining the necessary freezing temperature for ice formation.
Solution Approach 2:
The invention introduces a thermal insulation barrier (vacuum insulator) as an intermediary between the icemaker sub-compartment and the external environment. This vacuum barrier minimizes heat transfer into the sub-compartment, reducing the cooling load and energy consumption while maintaining the freezing temperature required for the icemaker.
2Temperature
If a liquid coolant circulation system is used to cool the icemaker, then effective cooling is achieved, but the system becomes complex and difficult to maintain
Solution Approach 1:
The invention extracts the coolant circulation system entirely from the icemaker sub-compartment design. Instead of using liquid coolant that would require pumps, seals, and complex circulation loops, the patent employs direct evaporative cooling with a solid-state evaporator and vacuum insulation. This eliminates maintenance difficulties associated with liquid coolant systems while achieving effective cooling.
Solution Approach 2:
The invention replaces the mechanical liquid coolant circulation system with a passive thermal management system based on phase change (evaporation) and vacuum insulation. This substitution eliminates moving parts, pumps, and sealed fluid systems, thereby dramatically improving ease of repair and reliability while maintaining effective cooling performance.
3Object-affected harmful factors
If heaters are added to prevent condensation on the main body, then condensation is prevented, but manufacturing cost increases
Solution Approach 1:
The invention introduces a vacuum insulator as a thermal intermediary between the cold interior surfaces and the external environment. This vacuum barrier prevents heat transfer that would otherwise cause condensation on the main body surfaces, eliminating the need for additional heaters while preventing condensation formation.
Solution Approach 2:
The invention converts the potential harm of heat transfer (which causes condensation) into a benefit by using vacuum insulation to block heat flow. The vacuum barrier transforms the thermal challenge into an opportunity for energy efficiency and condensation prevention without requiring active heating systems, thereby reducing manufacturing costs.
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 solution reduces energy consumption and manufacturing costs by providing effective cooling to the icemaker sub-compartment while simplifying maintenance by eliminating complex ducts and liquid coolant circulation systems.
Implementation Method 1
a heat exchanger supported by the first wall and positioned so that when the door is closed the heat exchanger is exposed to an interior of the sub-compartment through the opening
Implementation Method 2
one or more segments of the refrigeration system attached to a heat exchanging plate
Data Source
AI summary
A refrigerator includes a main body defining a compartment, the compartment having an access opening and a first wall, a door supported by the main body for selectively closing at least part of the access opening, a sub-compartment on the door, the sub-compartment comprising a second wall having an opening, a heat exchanger supported by the first wall and positioned so that when the door is closed the heat exchanger is exposed to an interior of the sub-compartment through the opening, and a refrigeration system having a working medium for cooling the heat exchanger, where the heat exchanger further includes one or more segments of the refrigeration system attached to a heat exchanging plate.