Projector Cooling via Heat Pipe and Peltier Device
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Solution Overview
Problem
Existing projector cooling systems face inefficiencies in heat transfer from the thermoelectric conversion unit to the heat sink, leading to inadequate cooling of optical devices, and are plagued by noise issues due to increased fan speed and the inefficiency of upsizing the heat sink.
Innovation Solution
The projector incorporates a heat pipe with a hydraulic fluid that transfers heat through evaporation and condensation, combined with a thermoelectric conversion element and a heat sink with a stacking and projecting configuration, allowing efficient heat transfer and reduced noise through the use of a smaller cooling fan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the heat sink is upsized to transfer heat more efficiently, then heat transfer performance improves, but device complexity and size increase
Solution Approach 1:
A heat pipe is introduced as an intermediary component between the thermoelectric conversion element and the heat sink. The heat pipe efficiently transfers heat from the heat generating part to the heat sink through phase change of hydraulic fluid, eliminating the need to enlarge the heat sink while maintaining effective heat dissipation
Solution Approach 2:
The heat pipe utilizes phase transitions (evaporation and condensation) of hydraulic fluid to transfer heat. The hydraulic fluid evaporates at the heat generating part, absorbs latent heat, condenses at the heat sink, and releases heat, creating an efficient heat transfer cycle without requiring a large heat sink structure
2Loss of energy
If the cooling fan wind speed is increased to dissipate heat more effectively, then heat dissipation performance improves, but noise increases
Solution Approach 1:
The heat pipe acts as an intermediary that enhances heat transfer efficiency, allowing the system to achieve effective heat dissipation without relying on high fan speeds. This reduces the harmful noise effect while maintaining adequate cooling performance
Solution Approach 2:
The system changes the heat transfer parameter by introducing phase change heat transfer in the heat pipe, which has higher heat transfer coefficients than forced convection alone. This allows reduction of fan speed while maintaining heat dissipation efficiency
3Reliability
If the thermoelectric conversion unit is used to cool the optical device, then cooling function is provided, but heat transfer efficiency to the heat sink is insufficient
Solution Approach 1:
The heat pipe serves as an intermediary that bridges the thermoelectric conversion element and the heat sink, significantly improving heat transfer efficiency. It efficiently conducts heat from the heat generating part of the thermoelectric element to the heat sink through phase change mechanisms
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 ensures effective cooling of optical devices, enabling better image quality over a longer period while minimizing projector size and noise by efficiently dissipating heat and allowing for flexible projector positioning.
Implementation Method 1
heat is transferred by reception of heat of the heat generation part and convection of the hydraulic fluid
Implementation Method 2
The hydraulic fluid is evaporated in an evaporation part and the vapor moves to a condensation part and condensed into a liquid in the condensation part
Implementation Method 3
heat is transferred by reception of heat of the heat generation part and convection of the hydraulic fluid
Implementation Method 4
a thermoelectric conversion element having a heat absorbing part that absorbs the heat of the heat receiving part and a heat generating part that generates heat when the absorbing part absorbs heat
Data Source
AI summary
A projector includes a cooling device cooling a liquid crystal panel. The cooling device includes a heat receiving part receiving heat of the liquid crystal panel, a Peltier device having a heat absorbing part that absorbs the heat of the heat receiving part and a heat generating part that generates heat when the absorbing part absorbs heat, a heat sink provided so that heat may be transferred to the heat generating part, and a heat pipe containing a hydraulic fluid inside, in which heat is transferred by convection of the hydraulic fluid. The heat sink has a stacking part superimposed on the Peltier device and a projecting part projecting from the Peltier device as seen from the Peltier device side, and the heat pipe has an interior part located between the Peltier device and the stacking part and an extending part extending along the projecting part.