Dual-Compartment Refrigerator Control for Balanced Cooling
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Solution Overview
Problem
Existing cooling devices with separate fresh food and freezing compartments face inefficiencies in energy consumption and temperature control, as the compressor's operation is often referenced to one compartment's temperature, leading to excessive heating or cooling in the other, and inefficient fan operation.
Innovation Solution
A control unit is introduced to manage the compressor and fan activation/deactivation based on predetermined temperature settings for both compartments, allowing the fan to operate independently at specific intervals and adjust speed, and a heater can be activated to maintain optimal conditions, ensuring homogeneous air distribution and reducing energy waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the compressor operation is referenced to one compartment's temperature, then that compartment's temperature control is maintained, but the other compartment experiences excessive heating or cooling
Solution Approach 1:
The control system is segmented to independently manage each compartment's temperature requirements. The processor evaluates temperature conditions for both the refrigerating compartment and freezing compartment separately, allowing customized control strategies for each zone rather than using a single reference temperature.
Solution Approach 2:
The control system dynamically adjusts compressor operation based on real-time temperature conditions in both compartments. The processor continuously monitors and adapts the compressor control decisions according to the specific thermal state of each compartment, enabling flexible and responsive temperature management.
2Temperature
If the fan operates simultaneously with the compressor, then the compartment temperature can be maintained, but energy is consumed unnecessarily
Solution Approach 1:
The fan operates periodically rather than continuously, with its operation timed to coincide with compressor cycles and temperature requirements. The processor controls the fan to run only when necessary for temperature maintenance, creating a periodic operation pattern that reduces energy consumption while preserving temperature stability.
Solution Approach 2:
The control system uses temperature feedback from both compartments to determine fan operation timing. The processor monitors temperature conditions and activates the fan only when temperature deviations occur, creating a feedback-based control mechanism that optimizes energy usage while maintaining thermal stability.
3Use of energy by moving object
If the fan operation is determined by compartment temperature reaching cut-in values, then energy saving is achieved, but homogeneous air distribution cannot be ensured in low-temperature environments
Solution Approach 1:
The fan control system serves multiple functions: it maintains energy efficiency by operating based on temperature thresholds while simultaneously ensuring homogeneous air distribution through coordinated operation with the compressor. The processor integrates both objectives into a unified control strategy that achieves dual benefits.
Solution Approach 2:
The fan is activated in advance of temperature deviations occurring, based on predictive control logic that considers compressor operation cycles and anticipated thermal changes. This preliminary action prevents temperature fluctuations before they occur, maintaining both energy efficiency and air distribution homogeneity.
4Temperature
If the compressor is deactivated based on one compartment reaching its temperature, then that compartment is maintained, but the other compartment may require continued cooling
Solution Approach 1:
The control system continuously monitors temperature feedback from both compartments and uses this information to make informed compressor control decisions. The processor evaluates the thermal state of both the refrigerating and freezing compartments simultaneously, ensuring reliable temperature maintenance in both zones before deactivating the compressor.
Solution Approach 2:
The compressor control is dynamically adjusted based on the specific thermal requirements of each compartment. The processor adapts the compressor deactivation timing to account for the different thermal masses and cooling requirements of the two compartments, ensuring that neither compartment experiences temperature deviations.
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 enhances cooling efficiency by preventing excessive cooling, maintaining optimal temperatures, and reducing energy consumption through intelligent control of the compressor, fan, and heater, ensuring effective and efficient temperature management in both compartments.
Implementation Method 1
the refrigeration process is performed by means of evaporators disposed in the compartments
Implementation Method 2
both refrigeration circuits are connected to a single compressor
Implementation Method 3
the fan located in the fresh food compartment and providing the air activation is activated
Data Source
Figure 1
AI summary
The present invention relates to a cooling device (1) comprising a fresh food compartment (2) wherein the foodstuff is placed to be cooled, a freezing compartment (3) wherein the foodstuff is placed to be frozen, kept at temperatures lower than that of the fresh food compartment (2), a compressor (4) compressing and circulating the refrigerant in the refrigeration cycle, a fresh food compartment temperature sensor (5) measuring the fresh food compartment (2) temperature for controlling the cooling process, a freezing compartment temperature sensor (6) measuring the freezing compartment (3) temperature for controlling the freezing process, a fan (7) providing the air circulation in the fresh food compartment (2) and a control unit (8) that determines the activation and deactivation times of the compressor (4) and the fan (7) by controlling the data received from the temperature sensors (5, 6).