Vehicle Heat Pump Vapor Injection for Multi-Mode Refrigerant Flow
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Solution Overview
Problem
Current vehicle heat pumps face inefficiencies in heat exchange and refrigerant management, particularly in varying operational modes such as cabin cooling, battery cooling, and deicing, which affect performance and energy efficiency.
Innovation Solution
The heat pump system incorporates a refrigerant loop with a vapor generator that performs phase separation and injects a gaseous component into the compressor's mid-pressure inlet, along with an accumulator and expansion valves, to optimize heat exchange and refrigerant flow, enhancing efficiency across different modes of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional refrigerant loop is used without phase separation, then the system structure is simpler, but heat exchange efficiency and refrigerant management deteriorate
Solution Approach 1:
The refrigerant loop is segmented into multiple functional zones including a vapor generator with first and second regions, an accumulator, and multiple heat exchangers. This segmentation allows independent optimization of each zone for phase separation, heat exchange, and refrigerant management, resolving the contradiction between efficiency and complexity by organizing complexity functionally
Solution Approach 2:
The vapor generator acts as an intermediary component between the compressor and heat exchangers, performing phase separation and gaseous component removal. This intermediary function improves heat exchange efficiency by ensuring proper refrigerant state while containing the complexity within a dedicated component rather than throughout the entire system
2Productivity
If the compressor operates without mid-pressure inlet injection, then the compressor structure is simpler, but the load on the compressor increases and efficiency decreases
Solution Approach 1:
The compressor is designed with dynamic pressure management through a mid-pressure inlet that receives gaseous refrigerant from the vapor generator. This allows the compressor to operate across varying pressure conditions and optimize its loading, improving efficiency by adapting to different operational demands rather than operating at fixed conditions
Solution Approach 2:
The mid-pressure inlet enables parameter changes in the compressor operation by accepting refrigerant at intermediate pressure levels. This allows optimization of compression ratios and loading conditions, improving productivity while the parameter flexibility contains the complexity within the control and routing system
3Loss of energy
If expansion valves are positioned without three-way valve control, then the valve system is simpler, but refrigerant flow management and heat exchange optimization deteriorate
Solution Approach 1:
The three-way valve serves multiple functions: directing refrigerant flow to different heat exchangers, controlling expansion valve operation, and enabling various operational modes (cabin cooling, battery cooling, deicing). This multi-functionality improves refrigerant flow efficiency across different modes while containing the complexity within a single versatile component
Solution Approach 2:
The three-way valve provides dynamic flow routing that adapts to different operational requirements. By dynamically directing refrigerant to different paths and heat exchangers based on demand, the system optimizes heat exchange efficiency while the valve's ability to handle multiple configurations reduces the need for separate dedicated components
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 improves the heat pump's efficiency and heat exchange capacity, reduces the compressor's load, and expands its ambient temperature operating range, leading to better performance in various vehicle cooling and heating modes.
Implementation Method 1
The vapor generator removes at least a portion of a gaseous component of a first heat exchange fluid and provides the at least a portion of the gaseous component of the first heat exchange fluid to the mid-pressure inlet of the compressor
Implementation Method 2
The first expansion valve is positioned upstream of the accumulator. The first expansion valve includes an inlet and an outlet
Implementation Method 3
The refrigerant loop includes a first heat exchanger, a first region of a second heat exchanger, a third heat exchanger, a fourth heat exchanger
Data Source
AI summary
A heat pump includes a refrigerant loop. The refrigerant loop includes a first heat exchanger, a first region of a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a compressor, a vapor generator, an accumulator, a first expansion valve, and a first three-way valve. The compressor includes a low-pressure inlet, a mid-pressure inlet, and an outlet. The vapor generator is positioned downstream of the outlet of the compressor and upstream of both the low-pressure inlet and the mid-pressure inlet. The accumulator is positioned immediately upstream of the compressor. The accumulator includes an inlet and an outlet. The first expansion valve is positioned upstream of the accumulator. The first expansion valve includes an inlet and an outlet. The first three-way valve is positioned immediately downstream of the first expansion valve and immediately upstream of the accumulator.