Tidal stream generators (TSGs) make use of the kinetic energy of moving water to power turbines, in a similar way to wind turbines that use moving air.
A TSG is a machine that extracts energy from moving masses of water, or tides.
Energy can be captured from tidal streams using two methods,
Tidal fences and Tidal turbines.
Dynamic tidal power or DTP is a new an
tidal energy and so on are researched with activity by scientists. Among them, hydrogen energy system supremely comes into the spotlight. Hydrogen energy system bases an ideal principle which hydrogen is produced from water and returns to the original substance; water after being used. We can expect that after 2010, the cost of hydrogen as one of the resources should be lower than that of fossil
method of cooling for chip, but it
reflects the uneven power distribution, and also may result in over
Cooling of large areas, leading to excessive package cost.
• Active cooling technologies have shed new light on this matter.
And Thermoelectric cooler(TEC) has been the most accessible one.
Not discrete, thick bulk materials.
• Some of literature describe about thin-film
flux와 convection heat flux를 적용하면,
Fin의 형상이 직사각형이고, 횡단면적이 일정하므로 , (횡단면적의 둘레의 길이)이다. 위 식을 다시 간단히 정리하여 나타내면 다음과 같다.
여기서 초과온도(excess temperature) 를 로 정의하여 식을 정리하면, 위의 2nd order Nonhomogeneous ODE를 2nd order Homogeneous ODE로
1. Plot the 1-D temperature profile with analytical solution
(temperature vs fin length)
1) Analytical Solution
Fin의 미소면적에 대해 대류에 의한 열의 손실을 고려하여 열전달식을 세워 보면,
---------- (1)
한편 미소변화량은 다음과 같이 나타낼 수 있다.
---------- (2)
(1), (2)에서