Fresh Food Ice Maker Valve Control for Refrigerant Temperature Stability
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Solution Overview
Problem
Conventional ice making assemblies in refrigerators often inefficiently control refrigerant temperature and flow, leading to suboptimal ice production and energy usage, as they lack precise control mechanisms to adjust valve openings based on real-time refrigerant temperature and slope changes.
Innovation Solution
A method and system for controlling a refrigeration system that involves sensing refrigerant temperature and slope changes to adjust the opening of a valve before the ice maker evaporator, using a variable duty cycle to maintain optimal refrigerant loading and temperature control, allowing for independent operation of the ice maker and fresh food compartments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional ice making assemblies use fixed valve openings and lack real-time temperature control, then the system structure is simple, but ice production efficiency is low and energy usage is suboptimal
Solution Approach 1:
The patent applies dynamics by transitioning from fixed valve openings to dynamically adjustable valve positions based on real-time refrigerant temperature feedback. The control system continuously modifies valve opening degree to optimize refrigerant flow, enabling adaptive ice production that responds to changing thermal conditions rather than operating with static parameters.
Solution Approach 2:
The patent implements feedback control by sensing refrigerant temperature at the evaporator outlet and using this information to adjust the expansion valve opening. This closed-loop control system continuously monitors thermal conditions and modifies valve position accordingly, creating a self-regulating mechanism that optimizes ice production efficiency while managing system complexity through intelligent control algorithms.
2Measurement precision
If the refrigeration system uses separate control for ice maker and fresh food compartments, then temperature control precision is improved, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the refrigeration system into two independent control zones: the ice maker compartment with its dedicated evaporator and temperature control, and the fresh food compartment with its own evaporator and control system. This segmentation allows each compartment to be optimized independently for its specific temperature requirements, achieving precise temperature control while managing overall system complexity through modular design.
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 approach enables efficient ice production by ensuring the refrigerant reaches the desired temperature and pressure, improving energy usage and maintaining the desired temperature in both the ice maker and fresh food compartments, thus enhancing the overall performance of the refrigeration system.
Implementation Method 1
Air movers, such as fans for example, circulate the air in the freezer compartment for the purpose of bringing the cold air into contact with all sections of the freezer compartment
Implementation Method 2
manufactures ice by the freezing of water by convection as the cold circulating air in the freezer compartment comes into contact with the water and by conduction as that same cold air cools the ice molds in which the water is held
Data Source
AI summary
A refrigeration system is provided with an ice maker chamber within a fresh food compartment. The refrigeration system includes a refrigeration path and an ice maker path. The ice maker path includes an electronic expansion valve for controlling the refrigerant entering an ice maker evaporator and an evaporator pressure regulator. Controlling the refrigeration system includes the steps of sensing a first refrigerant temperature at an exit of the ice maker evaporator and controlling a first control of the electronic expansion valve until the temperature reaches a temperature target. The method of controlling can further include comparing a slope of the temperature to at least one of a minimum, a target, or a maximum setting to adjust the control. Subsequently, a second control for the electronic expansion valve can be repeatedly adjusted by evaluating the first refrigerant temperature and the slope.