Vehicle Air-Conditioning Device with Segmented Coolant Paths
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Solution Overview
Problem
The existing vehicle air-conditioning device suffers from energy efficiency deterioration due to reheating of engine coolant water after it has been cooled, as the cooled coolant water is circulated back to the heat-releasing side heat exchanger.
Innovation Solution
A vehicle air-conditioning device with a refrigeration cycle and a shutting off mechanism that separates the coolant-water circulation paths, allowing heat transfer via a cooling medium from one path to another, preventing reheating of coolant water by shutting off communication between the paths when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If coolant water is circulated between the engine and the vehicle-cabin radiator through a single communication path, then heat transfer is simplified, but energy efficiency deteriorates due to reheating of cooled coolant water
Solution Approach 1:
The single coolant-water circulation path is segmented into two separate paths: a first circulation path for the engine and a second circulation path for the vehicle-cabin radiator. This segmentation prevents cooled coolant from being reheated, thereby improving energy efficiency while maintaining manageable system complexity through structured separation.
Solution Approach 2:
A shutting off mechanism (three-way valve) is introduced as an intermediary component to control communication between the first and second circulation paths. This valve enables selective isolation of the paths, preventing harmful reheating of coolant while allowing heat transfer when needed, thus resolving the energy efficiency issue without permanently complicating the system structure.
2Loss of energy
If a shutting off mechanism is added to separate coolant-water circulation paths, then reheating of coolant water is prevented, but device complexity increases
Solution Approach 1:
The three-way valve serves multiple functions: it acts as a shutting off mechanism to separate circulation paths, a mixing valve to blend coolant streams when needed, and a flow distribution device. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity while achieving the energy efficiency improvement.
3Temperature
If coolant water flows continuously through both engine and radiator, then heat transfer is maintained, but temperature control precision deteriorates due to unwanted heat exchange
Solution Approach 1:
The shutting off mechanism dynamically adjusts the communication state between the first and second circulation paths based on operational requirements. By switching between connected and isolated states, the system optimizes temperature control precision and prevents unwanted heat exchange, thereby improving both temperature control and heat transfer efficiency without permanent structural 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 solution effectively suppresses energy efficiency deterioration by preventing reheating of coolant water, enhancing the overall energy efficiency of the air-conditioning system.
Implementation Method 1
a secondary evaporator in which the cooling medium absorbs heat from the coolant water in the first coolant-water circulation path
Implementation Method 2
a secondary condenser for releasing heat of the cooling medium that has absorbed the heat at the secondary evaporator to the coolant water in the second coolant-water circulation path
Implementation Method 3
a compressor for compressing cooling medium
Implementation Method 4
a secondary expander for decompressing the cooling medium that has passed through the secondary condenser
Data Source
AI summary
A vehicle air-conditioning device includes: a first coolant-water circulation path in which coolant water passes through an engine; a second coolant-water circulation path that is communicated with the first coolant-water circulation path and in which the coolant water passes through a vehicle-cabin radiator; a shutting off mechanism that shuts off, when switched to a shut-off state, the communication between the first coolant-water circulation path and the second coolant-water circulation path; and a refrigeration cycle. The refrigeration cycle has: a compressor for compressing cooling medium; a secondary evaporator in which the cooling medium absorbs heat from the coolant water in the first coolant-water circulation path; a secondary condenser that releases heat of the cooling medium that has absorbed the heat at the secondary evaporator to the coolant water in the second coolant-water circulation path; and a secondary expander that decompresses the cooling medium that has passed through the secondary condenser.