Refrigerator Hot-Gas Heating Tube for Cold Ambient Operation
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Solution Overview
Problem
In low ambient temperatures, refrigerators often struggle to prevent the fresh food compartment from freezing, leading to increased energy consumption as both cooling and heating are required, with existing solutions either inefficient or not effectively addressing the issue.
Innovation Solution
A heating tube connected to the refrigerant line in the fresh food compartment, controlled by a solenoid valve and temperature sensor, directs hot gas refrigerant to heat the compartment, preventing freezing and optimizing energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an electrical heater is operated in the fresh food compartment to prevent freezing, then the foodstuff is protected from freezing, but energy consumption increases due to simultaneous cooling and heating operations
Solution Approach 1:
The high-temperature hot gas refrigerant leaving the compressor, which would otherwise be wasted heat, is redirected through a heating tube in the fresh food compartment via a solenoid valve and branch line. This converts the harmful excess heat into a useful heating source to prevent freezing, eliminating the need for separate electric heaters and reducing energy consumption.
Solution Approach 2:
The refrigeration system itself provides the heating function by utilizing its own hot gas refrigerant to heat the fresh food compartment when needed. The solenoid valve enables the system to self-regulate by directing refrigerant flow to either the evaporator or heating tube based on ambient temperature conditions, making the system self-sufficient without external heating devices.
2Temperature
If the refrigerant is directed through the evaporator in the fresh food compartment to cool it, then the refrigeration system functions normally, but in cold environments the fresh food compartment requires additional heating
Solution Approach 1:
The refrigerant line serves multiple functions: it cools the freezer compartment through the evaporator, cools the fresh food compartment through the second evaporator when needed, and heats the fresh food compartment through the heating tube when ambient temperature is low. The solenoid valve enables this multi-functionality by directing refrigerant flow to different paths based on operating conditions, eliminating the need for separate heating infrastructure.
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
Effectively maintains the fresh food compartment at a stable temperature, reducing the need for electric heating and lowering energy consumption by efficiently managing refrigerant flow in response to ambient conditions.
Implementation Method 1
through which the refrigerant fluid which is in gas form and at high temperature leaving the compressor and separated partially from refrigerant line by means of a solenoid valve and a branch line flows, and which enables the fresh food compartment to be heated
Data Source
Figure 1
Figure 2
AI summary
Refrigerator (1) comprising a fresh food compartment (2) wherein the foodstuff is cooled and stored, a freezer compartment (3) in which the foodstuff is frozen and stored, a compressor (4) performing the refrigeration cycle, a condenser (5), a first evaporator (6) which cools the freezer compartment (3), a second evaporator (7) which cools the fresh food compartment (2), an expansion member (8) provided between the condenser (5) and the first evaporator (6), a refrigerant line (9) which enables the refrigerant fluid to be transferred, and a heating tube (10) enabling the fresh food compartment (2) to be heated at low ambient temperatures.