Cold Compartment Lining for Refrigerator Temperature Stabilization
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Solution Overview
Problem
Conventional refrigerators and freezers with intermittently operated refrigeration systems experience significant temperature gradients within cold compartments, leading to non-uniform temperatures that can be detrimental for storing temperature-sensitive materials, especially in low-volume, high-value applications like pharmaceuticals and industrial products.
Innovation Solution
A lining made of materials with high thermal conductivity and mass is placed along the interior walls of the cold compartment, absorbing heat during the 'OFF' periods and conducting heat during the 'ON' periods to stabilize the temperature, ensuring uniformity without major structural changes or increased energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fans and airflow systems are used to reduce temperature gradients, then temperature uniformity is improved, but device complexity and energy consumption increase
Solution Approach 1:
A thermal mass element is introduced as an intermediary between the refrigeration system and the stored materials. This thermal mass acts as a buffer that absorbs excess heat during cooling cycles and releases it during warming cycles, thereby reducing temperature gradients without requiring fans or complex airflow systems.
Solution Approach 2:
The thermal properties of the compartment walls are modified by adding a thermal mass layer with specific heat capacity. This changes the thermal response characteristics of the compartment, allowing it to maintain more uniform temperatures during the intermittent operation of the refrigeration system.
2Temperature
If fans are added to improve air circulation, then temperature gradients are reduced, but reliability decreases due to additional failure points
Solution Approach 1:
The thermal mass element serves as a passive intermediary that stabilizes temperatures without requiring active mechanical components. By storing and releasing thermal energy, it reduces temperature gradients while avoiding the reliability issues associated with fan motors and control systems.
Solution Approach 2:
The thermal mass element automatically regulates temperature fluctuations through its inherent thermal properties, without requiring external control systems, sensors, or moving parts. The system self-regulates by absorbing heat when temperatures rise and releasing heat when temperatures fall.
3Temperature
If the refrigeration system operates continuously to maintain uniform temperature, then temperature stability is improved, but energy consumption increases
Solution Approach 1:
The thermal mass element is pre-charged with cooling during the OFF periods of the refrigeration system, storing thermal energy that is then released during the ON periods. This preliminary action allows the system to maintain temperature stability without continuous operation of the refrigeration compressor.
Solution Approach 2:
By changing the thermal capacity parameters of the compartment through the addition of thermal mass, the system can tolerate longer OFF periods without excessive temperature rise, thereby reducing the duty cycle and energy consumption of the refrigeration system.
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 achieves a more uniform temperature throughout the cold compartment, independent of content location or volume, maintaining desired temperatures in scientific, laboratory, and industrial settings without increasing energy use or mechanical complexity, ensuring reliable performance over extended periods.
Implementation Method 1
the lining being constructed of a material having a combination of thermal conductivity and thermal mass for absorbing heat from the interior of the cold compartment during the OFF periods
Implementation Method 2
conducting heat into the interior of the cold compartment during the ON periods
Implementation Method 3
a refrigeration system operated intermittently, in cycles of operation between ON periods and OFF periods
Data Source
AI summary
A selected temperature is stabilized within the interior of a cold compartment of a refrigerator or freezer wherein the selected temperature is effected by a refrigeration system operated in cycles of operation comprised of ON periods and OFF periods. A lining is extended along the perimeter of the interior of the compartment, exposed to the interior, the lining being constructed of a material having a combination of thermal conductivity and thermal mass enabling the conduct of heat into the interior of the compartment during the ON periods and the absorption of heat from the interior of the compartment during the OFF periods, whereby the temperature within the interior of the compartment essentially is stabilized at the selected temperature during cyclical operation of the refrigeration system.