Vehicle Heat Pump Airflow Redirection for Cold-Start Defrost
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Solution Overview
Problem
Vehicle air condition arrangements with heat pump systems experience reduced performance in cold weather due to low efficiency at startup.
Innovation Solution
A method involving redirecting the air flow from the condenser to the evaporator in the heat pump system, increasing energy transfer to the low-pressure side and defrosting the evaporator, while using a control unit to manage airflow through separate ducts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the heat pump system operates in cold weather at startup, then the air condition arrangement can provide heating and cooling functions, but the system performance is low due to insufficient pressure and temperature buildup on the low-pressure side
Solution Approach 1:
The patent applies preliminary action by using the condenser to preheat air that is then directed to the evaporator before the heat pump system starts normal operation. This preliminary heating action builds up pressure and temperature on the low-pressure side in advance, enabling the system to reach nominal power faster and improving overall performance in cold weather startup conditions
2Productivity
If the evaporator operates at sub-zero temperatures for a period of time, then the air condition arrangement can provide cooling function, but the evaporator accumulates frost reducing its efficiency
Solution Approach 1:
The patent converts the harmful frost accumulation on the evaporator into a beneficial defrosting process by redirecting hot air from the condenser to the evaporator. The warm air from the condenser, which would otherwise be wasted, is used to melt frost on the evaporator, transforming a harmful condition into a self-cleaning mechanism that restores evaporator efficiency
3Productivity
If additional equipment is added to redirect air flow from the condenser to the evaporator, then the system performance in cold weather is improved, but the device complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing the air distribution unit to serve multiple purposes: it distributes air to the vehicle compartment for climate control, and also redirects air from the condenser to the evaporator for system performance optimization and defrosting. This universal design allows existing components to perform multiple functions without adding significant complexity
Solution Approach 2:
The patent merges the airflow paths by integrating the defrosting function into the existing air distribution system. The air distribution unit combines the climate control function with the defrosting function, merging multiple operations into a single coordinated system that uses the same airflow infrastructure for both purposes
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
Enhances the performance of the air condition arrangement in cold weather by improving the heat pump system's efficiency and defrosting the evaporator, allowing it to operate at nominal power sooner.
Implementation Method 1
directing a flow of air heated by the condenser by work from the compressor
Implementation Method 2
transferring energy to a low-pressure side of the heat pump system via the evaporator by directing the air flow to the evaporator
Implementation Method 3
increasing the temperature of the evaporator by directing the air flow to the evaporator
Data Source
AI summary
A method for controlling an air condition arrangement of a vehicle. The air condition arrangement includes a heat pump system having a compressor, a condenser, and an evaporator. An air distribution unit is arranged in the vehicle for providing air to a vehicle compartment of the vehicle. The method includes directing a flow of air heated by the condenser by work from the compressor to the evaporator.