Heat pump system with electromagnetic-induction heating and control method therefor
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Solution Overview
Problem
Heat pump systems face inefficiencies in heating mode, particularly at low outdoor temperatures, leading to reduced indoor heating capacity, frequent defrosting needs, and potential safety hazards due to reliance on electrical heating without adequate support from indoor unit configurations.
Innovation Solution
Incorporation of an electromagnetic heating assembly with an induction heating sheet, insulation plate, and electromagnetic induction wire coil attached to the outdoor heat exchanger, which raises the temperature of the outdoor heat exchanger for improved defrosting and heating efficiency, enhancing the system's starting capacity and safety through magnetic field heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heat pump system operates in heating mode at low outdoor temperatures, then the refrigerant absorbs heat from outdoor air, but the heating effect deteriorates and frosting occurs on the outdoor heat exchanger
Solution Approach 1:
The electromagnetic heating assembly performs preliminary heating of the outdoor heat exchanger before the refrigerant arrives, preventing frosting in advance. The controller activates the heating assembly when outdoor temperature drops below a preset threshold, ensuring the heat exchanger surface remains above freezing point before heat absorption begins
Solution Approach 2:
The electromagnetic heating assembly acts as an intermediary heating device between the refrigerant and the outdoor heat exchanger. It provides supplemental heat to the heat exchanger surface, mediating the temperature difference between the cold refrigerant and the ambient air, thereby preventing frosting while maintaining heat transfer efficiency
2Reliability
If defrosting is performed by absorbing heat from the indoor side, then the outdoor heat exchanger is defrosted, but the indoor temperature decreases for 10 minutes
Solution Approach 1:
The electromagnetic heating assembly serves as an external intermediary heat source for defrosting, eliminating the need to draw heat from the indoor environment. The heating assembly is activated during defrosting cycles to melt frost on the outdoor heat exchanger, while the indoor unit continues providing heating without temperature drop
Solution Approach 2:
The patent replaces the traditional mechanical defrosting method (reversing heat flow from indoor to outdoor) with an electromagnetic heating system. This substitution allows defrosting to occur independently of the indoor heating system, using electromagnetic induction to generate heat directly at the outdoor heat exchanger
3Reliability
If the compressor operates in preheat mode for a long time to raise refrigerant temperature, then the compressor reliability is maintained, but the heating response time is extended
Solution Approach 1:
The electromagnetic heating assembly performs preliminary heating of the refrigerant in the outdoor heat exchanger before the compressor starts operating. By pre-warming the refrigerant and heat exchanger when outdoor temperature is low, the system reduces the preheat time required for the compressor, enabling faster heating response while maintaining compressor reliability
Solution Approach 2:
The heating assembly operates continuously or periodically to maintain the outdoor heat exchanger temperature above freezing point, ensuring uninterrupted heat transfer. This continuous heating action eliminates the need for extended preheat cycles and maintains steady-state operation, reducing overall heating response time
4Power
If electrical heating is used in the indoor unit, then the heating capacity is sufficient, but safety hazards occur due to inadequate wire configuration
Solution Approach 1:
The patent replaces resistive electrical heating with electromagnetic induction heating in the outdoor unit. The induction heating assembly uses electromagnetic fields to generate heat directly in the heat exchanger, eliminating the need for high-power electrical wiring in the indoor unit and associated safety hazards, while providing sufficient heating capacity
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
The electromagnetic heating assembly enhances defrosting and heating efficiency, improves system reliability, and ensures high safety with quick heating and precise control, reducing the need for frequent defrosting and electrical heating, thus improving overall usability and comfort.
Implementation Method 1
the electromagnetic induction wire coil is attached to the insulation plate... the induction heating sheet is coupled with the electromagnetic induction wire coil by communication
Implementation Method 2
the electromagnetic heating assembly can heat the outdoor heat exchanger to raise its temperature... the electromagnetic induction wire coil
Data Source
AI summary
A heat pump system and a control method therefor are provided. The heat pump system includes an outdoor heat exchanger and an electromagnetic heating assembly. The electromagnetic heating assembly includes an induction heating sheet, an insulation plate, and an electromagnetic induction wire coil. The induction heating sheet is in contact with the outdoor heat exchanger, the electromagnetic induction wire coil is attached to the insulation plate, the insulation plate is connected to the outdoor heat exchanger or the induction heating sheet, the induction heating sheet is coupled with the electromagnetic induction wire coil by communication.