Vehicle HVAC Refrigerant Loop With Segmented Valve Distribution
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Solution Overview
Problem
Existing heating, ventilation, and air conditioning (HVAC) installations for vehicles, particularly hybrid or electric vehicles, face challenges in reducing manufacturing costs due to the complexity and expense of multi-way distributors used in air conditioning loops, which are necessary for reversible operation.
Innovation Solution
The design incorporates a simpler distribution system using single-channel, unidirectional refrigerant circulation pipes controlled by valves, allowing the same functions as multi-channel distributors with inexpensive components, and includes direct connections between the compressor and condenser, and optional expansion/bypass modules for variable pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-way distributor is used in the air conditioning loop to enable reversible operation, then the system can operate in multiple modes (cooling, heat pump, dehumidification), but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent divides the refrigerant circulation path into multiple separate single-channel pipes instead of using one complex multi-way distributor. Each pipe is controlled by its own valve, allowing independent control of refrigerant flow to different components (evaporator, condenser, heat exchanger). This segmentation transforms a single complex switching device into multiple simple controlled pathways.
Solution Approach 2:
The reversible heat exchanger serves multiple functions depending on the operating mode: it acts as a condenser in cooling mode, an evaporator in heat pump mode, and can be bypassed in dehumidification mode. This multi-functional component reduces the need for dedicated components for each mode, simplifying the overall system architecture.
2Adaptability or versatility
If a multi-way distributor with bidirectional valve capacity is used, then reversible operation is enabled, but the manufacturing cost increases due to the number of valves and their capacity requirements
Solution Approach 1:
Instead of using expensive bidirectional valves with high capacity requirements in a multi-way distributor, the patent segments the flow control into multiple unidirectional valves. Each valve only needs to handle flow in one direction with lower capacity requirements, making them cheaper and easier to manufacture while achieving the same reversible operation capability.
Solution Approach 2:
The patent employs multiple simpler, cheaper unidirectional valves rather than fewer expensive bidirectional valves. The cumulative cost of multiple low-cost unidirectional valves is lower than that of high-capacity bidirectional valves required for a multi-way distributor, reducing overall manufacturing cost.
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 solution reduces manufacturing costs while maintaining the ability to operate in various modes (cooling, dehumidification, heat pump, and recovery) by using cost-effective components and configurations, enhancing the efficiency and reversibility of the HVAC system.
Implementation Method 1
a compressor, advantageously controlled by a control unit
Implementation Method 2
a condenser
Implementation Method 3
an evaporator, for the dehumidification and/or the cooling of the internal air flow
Implementation Method 4
a reversible heat exchanger, preferably adapted to operate either as an evaporator or as a condenser
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to an air-conditioning loop (200) for a heating, ventilation and/or air-conditioning system, in particular for a cabin of a motor vehicle, in which a refrigerating fluid circulates, and which includes at least one compressor (210), a main outlet duct (20) arranged downstream of the compressor (210), a main return duct (21) arranged upstream of the compressor (210), a condenser (220), an evaporator (230), a reversible heat exchanger (240), and the distribution means (22) adjusted to selectively or simultaneously supply the evaporator (230) and/or the reversible heat exchanged (240). The distribution means (22) include at least one circulation duct (23, 24, 25, 26, 27) for a refrigerating fluid, which is controlled by a control valve (VA1, VA2, VA3, VR1, VR2) through which the refrigerating fluid flows in a single direction of circulation.