Heat pump for a vehicle
Solution Overview
Problem
Existing vehicle heat pumps face inefficiencies in heat exchange and refrigerant management, particularly in deicing and cooling modes, due to the complexity of refrigerant loops and the need for precise control of heat exchangers and valves.
Innovation Solution
A heat pump system with a refrigerant loop that includes a compressor, vapor generator, accumulator, expansion valves, and three-way valves, which thermally interacts with a coolant loop to optimize heat exchange and fluid flow, allowing for efficient deicing, cooling, and heating modes by directing heat exchange fluids through specific paths and heat exchangers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex refrigerant loop with multiple heat exchangers and valves is used to achieve precise heat exchange control in different modes, then the heat pump can perform multiple functions (heating, cooling, deicing), but the device complexity increases
Solution Approach 1:
The refrigerant loop is designed with multiple heat exchangers (first heat exchanger, first region of second heat exchanger, third heat exchanger, fourth heat exchanger) and control valves (first three-way valve, second three-way valve) that can be configured through different flow paths to perform heating, cooling, and deicing functions. The system uses a single integrated refrigerant loop that can serve multiple thermal management needs by redirecting refrigerant flow between different components based on operational mode.
2Productivity
If multiple expansion valves and three-way valves are positioned at specific locations to optimize heat exchange fluid flow, then the efficiency of heat exchange processes improves, but the device complexity increases
Solution Approach 1:
The system employs dynamically controllable three-way valves (first three-way valve positioned immediately downstream of the first expansion valve and immediately upstream of the accumulator, second three-way valve positioned downstream of the outlet of the compressor and upstream of an inlet of the first heat exchanger) that can redirect refrigerant flow in real-time based on operational requirements. This dynamic flow control allows the system to optimize heat exchange efficiency for different modes (heating, cooling, deicing) by adjusting which heat exchangers receive refrigerant and in what sequence.
Solution Approach 2:
The accumulator is positioned immediately upstream of the compressor to pre-separate liquid refrigerant before compression, preventing liquid slugging and ensuring only vapor enters the compressor. The expansion valves are positioned upstream of heat exchangers to pre-cool and expand refrigerant before it enters the heat exchange process, optimizing the thermodynamic conditions for efficient heat transfer.
3Productivity
If the vapor generator is positioned downstream of the compressor outlet and upstream of both low-pressure and mid-pressure inlets with thermal interaction between its regions, then the heat exchange performance improves, but the device complexity increases
Solution Approach 1:
The vapor generator is configured with a first region and a second region that thermally interact with one another, creating a nested thermal exchange arrangement. The vapor generator is positioned downstream of the compressor outlet and upstream of both the low-pressure inlet and mid-pressure inlet of the compressor, effectively nesting multiple functional zones within a single component structure to maximize space utilization and thermal efficiency.
Solution Approach 2:
The vapor generator acts as an intermediary component between the compressor outlet and the heat exchangers, with its first and second regions providing thermal interaction to condition the refrigerant before it enters different parts of the system. This intermediary positioning allows the vapor generator to mediate the thermal state of the refrigerant, ensuring optimal conditions for subsequent heat exchange processes.
4Productivity
If the first three-way valve directs heat exchange fluid from the expansion valve outlet to the accumulator inlet during deicing mode, then the deicing performance improves, but the control system complexity increases
Solution Approach 1:
The first three-way valve is positioned immediately downstream of the first expansion valve and immediately upstream of the accumulator, enabling dynamic redirection of refrigerant flow during deicing mode. The valve can switch between different flow paths to direct expanded refrigerant directly to the accumulator for rapid vaporization and compression, optimizing the deicing process by controlling the timing and path of refrigerant flow based on real-time thermal demands.
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 system enhances the efficiency and performance of heat exchange processes, improving the heat pump's ability to manage heat in various modes, such as deicing and cabin cooling, by optimizing fluid flow and thermal interactions within the refrigerant and coolant loops.
Implementation Method 1
The vapor generator includes a first region and a second region that thermally interact with one another
Implementation Method 2
The refrigerant loop includes a first heat exchanger, a first region of a second heat exchanger, a third heat exchanger, and a fourth heat exchanger
Implementation Method 3
The first expansion valve is positioned upstream of the accumulator. The first expansion valve includes an inlet and an outlet
Implementation Method 4
The 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 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 vapor generator includes a first region and a second region. 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.