Vehicle HVAC Temperature Channel Layout for Vent Air Separation
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Solution Overview
Problem
Conventional vehicle air conditioners experience unintended vertical temperature inversions and excessive discharge of cold or warm air through specific vents, leading to inadequate temperature control and discomfort for passengers.
Innovation Solution
The air conditioner features a temperature channel with separate cold and warm air guides within the air conditioning case, directing cold air to the defrost vent and warm air to the face vent, and includes partitions and baffles to control airflow, ensuring balanced temperature distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the defrost vent and face vent face the warm air passage in a conventional air conditioner, then the structure is simple and easy to manufacture, but unintended vertical temperature inversion occurs and excessive cold or warm air is discharged through specific vents
Solution Approach 1:
The patent divides the air passage into separate cold air passage and warm air passage sections, with dedicated discharge ports for each temperature zone. The defrost vent is positioned to face the cold air passage while the face vent faces the warm air passage, segmenting the airflow paths to prevent temperature mixing and vertical inversion.
Solution Approach 2:
Different regions of the air conditioning case are assigned different thermal characteristics. The upper portion (face vent area) is designed to discharge warm air while the lower portion (defrost vent area) discharges cold air, creating localized temperature zones that match the functional requirements of each vent.
2Device complexity
If the temperature door is designed in a sliding type with a rail-shaped guide groove, then the temperature control mechanism is simple, but the discharge temperature through defrost vent becomes excessively hot and vertical temperature difference increases
Solution Approach 1:
The patent pre-positioned the defrost vent to face the cold air passage and the face vent to face the warm air passage before the temperature door operation. This preliminary arrangement ensures that regardless of the temperature door position, the defrost vent receives predominantly cold air and the face vent receives predominantly warm air, preventing excessive temperature discharge.
3Productivity
If the discharge ports are positioned to facilitate warm air flow, then warm air discharge is improved, but cold air is excessively discharged through face vent and vertical temperature difference increases
Solution Approach 1:
The patent employs asymmetric positioning of discharge ports relative to the heat exchangers. The defrost vent is positioned asymmetrically to face the cold air passage outlet, while the face vent is positioned asymmetrically to face the warm air passage outlet. This asymmetric arrangement optimizes each vent's discharge efficiency for its intended temperature while maintaining overall temperature uniformity.
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 design reduces the temperature of air discharged through the defrost vent, increases the temperature of air discharged through the face vent, and enhances vertical temperature difference performance, providing improved comfort and temperature control.
Implementation Method 1
an evaporator 20 which is a cooling heat exchanger
Implementation Method 2
an indoor condenser 30 which is a heating heat exchanger
Data Source
AI summary
Disclosed is an air conditioner for a vehicle which can include: an air conditioning case in which an air passage and a plurality of air discharge ports are formed; and a cooling heat exchanger and a heating heat exchanger sequentially arranged in the air passage of the air conditioning case in an airflow direction, the air discharge ports include a defrost vent and a face vent, and a temperature channel is provided in an air passage inside the air conditioning case to guide cold air passing through the cooling heat exchanger to direct the discharge port of the defrost vent and guide warm air passing through the heating heat exchanger to direct the discharge port of the face vent.