Vehicle Heat Pump Coupling Layout for Compressor Inlet Flow
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Solution Overview
Problem
Existing vehicle heat pumps face inefficiencies in refrigerant loop design, leading to suboptimal performance in heating and cooling modes, and lack effective integration with coolant loops for comprehensive thermal management.
Innovation Solution
The proposed heat pump system incorporates a refrigerant loop with a specific configuration including an accumulator, compressor, heat exchangers, expansion valves, and coupling points, along with a coolant loop, to optimize heat exchange and fluid flow, enabling efficient operation in various modes such as cabin cooling, heating, and deicing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the refrigerant loop uses a conventional configuration with the accumulator directly connected to the compressor inlet, then the system structure is simple, but the heating and cooling performance is suboptimal
Solution Approach 1:
The refrigerant loop is segmented into multiple pathways with coupling points that allow independent optimization of different flow paths. The first coupling point divides the refrigerant flow between the accumulator and the first heat exchanger, enabling separate control of refrigerant conditioning and heat exchange processes, thereby improving overall system performance without excessive complexity.
Solution Approach 2:
The first heat exchanger acts as an intermediary component between the accumulator and the compressor. It conditions the refrigerant by exchanging heat with the heat exchange fluid, improving the refrigerant quality before it enters the compressor. This intermediary element enhances heating and cooling performance while maintaining manageable system complexity.
2Adaptability or versatility
If the heat pump system includes only a refrigerant loop, then the system is simpler, but thermal management capability is insufficient
Solution Approach 1:
The refrigerant loop and coolant loop are merged into a single integrated thermal management system. The heat exchangers serve dual purposes by facilitating heat transfer between the refrigerant and the heat exchange fluid, which is part of the coolant loop. This combination enables comprehensive thermal management including cabin climate control, battery thermal management, and component cooling/heating, significantly enhancing adaptability while managing system complexity through shared infrastructure.
Solution Approach 2:
The heat exchange fluid circuit serves multiple functions within the integrated system. It acts as a coolant for the refrigerant in the heat exchangers, as a heat transfer medium for cabin heating/cooling, and as a thermal management fluid for batteries and other vehicle components. This multi-functionality provides versatile thermal management capabilities while avoiding the need for separate dedicated systems for each function.
3Productivity
If the first heat exchange fluid bypasses the accumulator after the first heat exchanger, then the heat exchange efficiency is improved, but the refrigerant flow control becomes more complex
Solution Approach 1:
The system employs dynamic flow control through the first coupling point that can redirect refrigerant flow based on operational requirements. In certain modes, the heat exchange fluid bypasses the accumulator after passing through the first heat exchanger, allowing optimized heat exchange efficiency. The coupling point dynamically adjusts flow distribution between the accumulator and the bypass path, enabling the system to adapt to different operating conditions while managing flow control complexity.
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 pump's efficiency and flexibility, allowing for effective thermal management across different vehicle environments and operational modes, improving both heating and cooling performance.
Implementation Method 1
a first heat exchange fluid circulating through the refrigerant loop is directed to the low-pressure inlet of the compressor upon exiting the outlet of the first heat exchanger
Implementation Method 2
The low-pressure inlet is downstream of the outlet of the accumulator. The first coupling point is positioned immediately downstream of the outlet of the accumulator and immediately upstream of the low-pressure inlet of the compressor
Data Source
AI summary
A heat pump includes a refrigerant loop. The refrigerant loop includes an accumulator having an inlet and an outlet, a compressor, a first heat exchanger, and a first coupling point. The compressor includes a low-pressure inlet and an outlet. The low-pressure inlet is downstream of the outlet of the accumulator. The first heat exchanger includes an inlet and an outlet. The first coupling point is positioned immediately downstream of the outlet of the accumulator and immediately upstream of the low-pressure inlet of the compressor. The first coupling point is immediately downstream of the outlet of the first heat exchanger such that a first heat exchange fluid circulating through the refrigerant loop is directed to the low-pressure inlet of the compressor upon exiting the outlet of the first heat exchanger.