Answer: heat loss through wall is 16.58034kW
Temperature of inside wall surface is 47°c
Temperature of outside wall surface is -2.7°c
Explanation:detailed calculation and explanation is shown in the image below.
Answer:
Explanation:
First we compute the characteristic length and the Biot number to see if the lumped parameter
analysis is applicable.
Since the Biot number is less than 0.1, we can use the lumped parameter analysis. In such an
analysis, the time to reach a certain temperature is given by the following
From the data in the problem we can compute the parameter, b, and then compute the time for
the ratio (T – T)/(Ti
– T)
La altura es de 169.4 metros.
Dado que las dos torres que sostienen un puente colgante tienen una separación de 240m y una altura de 110m a partir de la carretera, si el cable tensor más corto mide 10m, para determinar cuál es altura de un cable que se encuentra a 100m de distancia del centro se debe realizar los siguientes cálculos, aplicando la ecuación parabólica:
- (240)² = 4P x (110-10)
- 57600 = 4P x 100
- 57600 = 400P
- 57600/400 = P
- 144 = P
- 200 x 200 = 4 x 144 x (Altura - 100)
- 40000 = 576Altura - 57600
- 40000 + 57600 / 576 = Altura
-
169.4 metros = Altura
Por lo tanto, la altura es de 169.4 metros.
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Answer:
No.
Explanation:
The Coefficient of Performance of the reversible heat pump is determined by the Carnot's cycle:
The power required to make the heat pump working is:
The heat absorbed from the exterior air is:
According to the Second Law of Thermodynamics, the entropy generation rate in a reversible cycle must be zero. The formula for the heat pump is:
Which contradicts the reversibility criterion according to the Second Law of Thermodynamics.
