Vapor injection heat pump
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Solution Overview
Problem
Current heat pump systems for vehicles face inefficiencies in heat exchange and refrigerant management, particularly in distributing refrigerant flow effectively across multiple heat exchangers and modes of operation, which affects performance and energy efficiency.
Innovation Solution
The proposed heat pump system incorporates a refrigerant loop with a compressor, multiple heat exchangers, branching points, shutoff valves, and a vapor generator, allowing for split paths and modes of operation that optimize refrigerant flow and heat exchange by injecting a gaseous component into the compressor's mid-pressure inlet, enhancing condensing capacity and reducing compressor load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If refrigerant flow is distributed across multiple heat exchangers, then heat exchange capacity is improved, but refrigerant management complexity increases
Solution Approach 1:
The refrigerant loop is divided into multiple paths with separate heat exchangers (first heat exchanger, second heat exchanger, vapor generator) that can operate independently or in combination. Each heat exchanger handles specific thermal loads (cabin heating/cooling, battery thermal management), allowing distributed heat exchange while maintaining manageable complexity through modular architecture.
Solution Approach 2:
The system employs dynamic flow control using shutoff valves (first shutoff valve, second shutoff valve, third shutoff valve, fourth shutoff valve) that can adjust refrigerant distribution in real-time based on operating conditions. This dynamic routing enables the system to adapt to different modes of operation (heating, cooling, dehumidification) and optimize heat exchange capacity while simplifying refrigerant management for each specific mode.
2Productivity
If vapor injection is implemented, then condensing capacity and compressor efficiency are improved, but system complexity increases
Solution Approach 1:
A vapor generator is introduced as an intermediary component that produces gaseous refrigerant for injection into the compressor's mid-pressure inlet. This intermediary device enables vapor injection functionality without requiring major modifications to the compressor itself, thereby improving condensing capacity and compressor efficiency while limiting the increase in overall system complexity through a dedicated, modular component.
3Adaptability or versatility
If multiple modes of operation are supported, then versatility is improved, but control complexity increases
Solution Approach 1:
The refrigerant loop is designed with universal components that can serve multiple functions across different operating modes. The first heat exchanger can function as a condenser or evaporator, the second heat exchanger handles both heating and cooling loads, and the vapor generator provides vapor injection for both compression efficiency improvement and defrosting. This multi-functionality enables versatile operation (heating, cooling, dehumidification, defrosting) without proportionally increasing control complexity.
Solution Approach 2:
The system uses dynamic control of shutoff valves to route refrigerant flow differently based on the desired mode of operation. During heating mode, refrigerant flows through specific paths; during cooling mode, different paths are activated; during dehumidification, yet another configuration is used. This dynamic reconfiguration allows the system to support multiple modes of operation while keeping control complexity manageable through a standardized valve control architecture.
4Use of energy by moving object
If compressor load is reduced, then energy efficiency is improved, but cooling capacity may be compromised
Solution Approach 1:
The system changes the physical parameters of the refrigerant by injecting gaseous refrigerant vapor into the compressor's mid-pressure inlet. This vapor injection modifies the refrigerant's pressure and temperature characteristics during compression, reducing the work required by the compressor and improving energy efficiency. Simultaneously, the injected vapor increases the overall refrigerant mass flow and enhances heat exchange capacity, thereby maintaining or even improving cooling capacity despite the reduced compressor load.
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, increases its heat exchange capacity, and expands its operating temperature range, leading to better performance across various modes of operation, including cooling and heating for both cabin and battery applications.
Implementation Method 1
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
second heat exchanger positioned downstream of the first heat exchanger
Implementation Method 3
compressor includes a low-pressure inlet, a mid-pressure inlet, and an outlet
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, a first branching point, a first shutoff valve, a second shutoff valve, and a second heat exchanger. The compressor includes a low-pressure inlet, a mid-pressure inlet, and an outlet. The first heat exchanger is positioned immediately downstream of the outlet of the compressor. The first branching point is positioned immediately downstream of the first region of the first heat exchanger. The refrigerant loop splits into a first path and a second path at the first branching point. The first shutoff valve is positioned along the first path and immediately downstream of the first branching point. The second shutoff valve is positioned along the second path and immediately downstream of the first branching point. The second heat exchanger is downstream of the first heat exchanger.