Thermoelectric Air Conditioning With Mode-Based Airflow Control
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Solution Overview
Problem
Air-conditioning apparatuses using thermoelectric devices are inefficient due to the same air flow rate being supplied to both heat generating and absorbing surfaces, leading to suboptimal utilization of the device's performance.
Innovation Solution
An air-conditioning system with separate fluid lines for each surface of the thermoelectric device, where the flow rate and voltage are controlled by a unit to optimize heat exchange, with higher flow rates in cooling mode and controlled fan operation to enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same flow rate of air is supplied to both heat generating and absorbing surfaces, then the structure is simple, but the thermoelectric device performance is not fully utilized
Solution Approach 1:
The patent divides the single air flow system into two separate fluid lines: a first fluid line for the heat absorbing surface and a second fluid line for the heat generating surface. This segmentation allows independent control of flow rates to each surface, enabling optimal heat exchange efficiency without requiring complex integrated control systems.
Solution Approach 2:
The patent implements dynamic flow rate control where the control unit adjusts the flow rate of the second fluid (higher in cooling mode) and first fluid (higher in heating mode) based on operational mode. This dynamic adjustment optimizes thermoelectric device performance utilization while maintaining manageable system complexity through mode-based control strategies.
2Temperature
If more air is supplied to the heat absorbing surface, then heat absorption improves, but energy waste increases due to excessive air flow
Solution Approach 1:
The patent changes the flow rate parameter of the second fluid to be higher in cooling mode when the heat absorbing surface requires maximum heat absorption. This parameter adjustment ensures efficient heat transfer while minimizing energy waste by matching fluid flow rates to actual thermal demands of each operational mode.
3Productivity
If the flow rate of the second fluid is increased in cooling mode, then heat exchange efficiency improves, but the system requires more complex flow control
Solution Approach 1:
The patent implements dynamic flow rate control where the control unit adjusts the flow rate of the second fluid to be higher in cooling mode than in heating mode. This dynamic adjustment optimizes heat exchange efficiency during cooling operations while maintaining simpler control requirements through mode-based flow rate strategies.
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
The system efficiently utilizes the thermoelectric device for both cooling and heating modes by optimizing fluid flow and voltage control, improving performance and efficiency.
Implementation Method 1
A thermoelectric device has one surface that generates heat, and one surface that absorbs heat, when electricity is supplied to the device
Implementation Method 2
A first line with a first fluid therein. The first line is configured such that the first fluid can exchange heat with a first surface of the thermoelectric device
Implementation Method 3
A second line has a second fluid therein. The second line is configured such that the second fluid can exchange heat with a second surface of the thermoelectric device, and pass through a heat sink to further exchange heat
Data Source
AI summary
An air conditioner includes a thermoelectric device, and a first line with a first fluid therein. The first line is configured such that the first fluid can exchange heat with a first surface of the thermoelectric device, and configured to discharge the fluid to a space. A second line has a second fluid therein. The second line is configured such that the second fluid can exchange heat with a second surface of the thermoelectric device, and pass through a heat sink to further exchange heat. A control unit supplies electricity to the thermoelectric device such that the first surface absorbs heat in a cooling mode and the second surface absorbs heat in a heating mode. The control unit also controls a flow rate of the second fluid, such that the flow rate is higher in the cooling mode than in the heating mode.