Vapor Injection Heat Pump with Dynamic Vapor Generator Positioning
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Solution Overview
Problem
Existing heat pump systems for vehicles face inefficiencies in heat exchange and operational flexibility, particularly in managing refrigerant flow and heat exchanger configurations, which affect performance and efficiency across different modes of operation.
Innovation Solution
The heat pump system incorporates a refrigerant loop with a compressor, multiple heat exchangers, a vapor generator, and branching points with shutoff and expansion valves, allowing for flexible positioning of components to optimize refrigerant flow and heat exchange in various modes of operation, including cabin cooling, battery cooling, and heating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional heat pump system uses a standard refrigerant loop configuration, then the system structure is simple, but the heat exchange capacity and operational flexibility are limited
Solution Approach 1:
The patent implements dynamic operational flexibility by enabling the vapor generator to switch positions upstream or downstream of the second heat exchanger based on operational mode, and by providing multiple branching points with shutoff valves that allow dynamic routing of refrigerant flow through different paths in the refrigerant loop
Solution Approach 2:
The patent applies multi-functionality by designing the refrigerant loop to support multiple operational modes (cabin cooling, battery cooling, heating) using the same core components, where the vapor generator can deliver gaseous refrigerant to either the low-pressure inlet or mid-pressure inlet of the compressor depending on requirements
2Productivity
If the heat pump system uses fixed component positioning, then the device complexity is reduced, but the heat exchange capacity and efficiency are compromised
Solution Approach 1:
The patent enables dynamic component positioning where the vapor generator can be positioned upstream or downstream of the second heat exchanger based on operational mode, allowing the system to optimize heat exchange capacity for different conditions without requiring multiple fixed configurations
3Productivity
If the compressor operates without vapor injection, then the device complexity is lower, but the efficiency and condensing capacity are reduced
Solution Approach 1:
The patent introduces the vapor generator as an intermediary component that produces gaseous refrigerant and delivers it to the compressor inlet, acting as a mediator that improves compressor efficiency and condensing capacity by controlling the state and timing of vapor injection into the compression process
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 configuration enhances the heat exchange capacity, improves efficiency, and expands the operating range of the heat pump by injecting a gaseous component into the compressor, reducing the load on the compressor and improving condensing capacity, thereby improving overall performance and flexibility across different operational conditions.
Implementation Method 1
The vapor generator delivers at least a portion of a gaseous component of a first heat exchange fluid to the mid-pressure inlet of the compressor
Implementation Method 2
A first region of the first heat exchanger is positioned immediately downstream of the outlet of the compressor. The second heat exchanger is positioned downstream of the first heat exchanger
Implementation Method 3
The refrigerant loop includes a first expansion valve positioned downstream of the third branching point
Data Source
AI summary
A heat pump includes a refrigerant loop. The refrigerant loop includes a compressor, a first region of a first heat exchanger. The first heat exchanger is positioned immediately downstream of an outlet of the compressor. A second heat exchanger is positioned downstream of the first heat exchanger. A vapor generator is positioned downstream of the first heat exchanger. The vapor generator is positioned upstream of the second heat exchanger in a first mode of operation. The vapor generator is positioned downstream of the second heat exchanger in a second mode of operation. A first branching point is positioned immediately downstream of the first region of the first heat exchanger.