Vehicle air-conditioning system
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Solution Overview
Problem
In vehicle air-conditioning systems, connecting multiple evaporators to a single expansion valve complicates the structure and leads to temperature deviations in air discharged from each evaporator.
Innovation Solution
A vehicle air-conditioning system with a two-row evaporation unit structure, where one expansion valve supplies refrigerant to both evaporators, allowing the refrigerant to circulate through both units in a sequential manner to minimize temperature deviations and reduce the number of expansion valves and parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one expansion valve supplies refrigerant to multiple evaporators, then the number of parts is reduced and cost is lowered, but temperature deviation in discharged air increases
Solution Approach 1:
The evaporator is divided into multiple independent evaporation units, each with its own flow control capability. This segmentation allows each unit to independently regulate refrigerant flow while sharing a common expansion valve, thus reducing part count while maintaining temperature uniformity across all units.
Solution Approach 2:
Each evaporation unit is equipped with a flow control valve that can dynamically adjust refrigerant flow based on individual unit requirements. This dynamic control compensates for the shared expansion valve configuration, enabling each unit to maintain optimal temperature and minimize temperature deviation in discharged air.
2Quantity of substance
If one expansion valve supplies refrigerant to two evaporators, then cost is lowered, but temperature uniformity deteriorates
Solution Approach 1:
The evaporator is segmented into multiple independent evaporation units, each capable of independent refrigerant flow control. This segmentation allows each unit to maintain consistent temperature characteristics despite sharing a common expansion valve, thereby preserving temperature uniformity in discharged air while reducing the number of expansion valves.
Solution Approach 2:
Each evaporation unit employs a flow control valve that can adjust refrigerant flow parameters independently. By dynamically changing flow parameters based on individual unit conditions, the system maintains temperature uniformity across all units while using a single expansion valve, thus lowering cost without sacrificing temperature consistency.
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 minimizes temperature deviations in the discharged air, reduces costs by fewer expansion valves, and simplifies the evaporator inlet configuration, enhancing cooling efficiency and reducing complexity.
Implementation Method 1
the liquid refrigerant sent out from the condenser 2 in the high-temperature and high-pressure state is rapidly expanded by the throttling operation of the expansion valve 3
Implementation Method 2
the evaporator 4 heat-exchanges the refrigerant with the air blown into the vehicle interior by a blower (not shown)
Implementation Method 3
the evaporator 4 for cooling the air discharged into an interior by a heat absorption operation due to latent heat of evaporation of the refrigerant
Implementation Method 4
the compressor 1 is driven by the power of an engine or a motor to suction and compress a low-temperature and low-pressure gaseous refrigerant to send out the refrigerant to the condenser 2 in a high-temperature and high-pressure gaseous state
Implementation Method 5
the condenser 2 heat-exchanges the gaseous refrigerant with external air to condense the refrigerant into a high-temperature and high-pressure liquid
Implementation Method 6
the condenser 2 for condensing the high-pressure refrigerant sent out from the compressor 1
Data Source
AI summary
The present invention provides a vehicle air-conditioning system comprising: a pair of evaporation units which cause heat exchange between a refrigerant and air, and which are arranged to be spaced apart from each other so as to discharge cold air in different directions; one expansion valve, which expands a low-temperature and high-pressure refrigerant so as to supply same to the evaporation unit; an inlet pipe in which the refrigerant of the expansion valve moves to a first evaporation unit; a first moving pipe in which the refrigerant having circulated through one region of the first evaporation unit moves to a second evaporation unit; a second moving pipe in which the refrigerant having circulated through the second evaporation unit moves to the first evaporation unit; and an outlet pipe through which the refrigerant having circulated through the first evaporation unit flows out.