Copper-coated, epoxy-filled fiberglass circuit boards are treated by heating a stack of them under high pressure, as shown in the sketch. The purpose of the pressing—heating operation is to cure the epoxy that bonds the fiberglass sheets, imparting stiffness to the boards. The stack, referred to as a book, is comprised of 10 boards and 11 pressing plates, which prevent epoxy from flowing between the boards and impart a smooth finish to the cured boards. In order to perform simplified thermal analyses, it is reasonable to approximate the book as having an effective thermal conductivity (k) and an effective thermal capacitance ρ c p . Calculate the effective properties if each of the boards and plates has a thickness of 2.36 mm and the following thermophysical properties: board (b) ρ = 1000 k g / m 3 , c p , b = 1500 J / k g ⋅ K , k b = 0.30 W / m ⋅ K ; plate ( p ) ρ p = 8000 k g / m 3 , c p , p = 480 J / k g ⋅ K , k p = 12 W / m ⋅ K .
Copper-coated, epoxy-filled fiberglass circuit boards are treated by heating a stack of them under high pressure, as shown in the sketch. The purpose of the pressing—heating operation is to cure the epoxy that bonds the fiberglass sheets, imparting stiffness to the boards. The stack, referred to as a book, is comprised of 10 boards and 11 pressing plates, which prevent epoxy from flowing between the boards and impart a smooth finish to the cured boards. In order to perform simplified thermal analyses, it is reasonable to approximate the book as having an effective thermal conductivity (k) and an effective thermal capacitance ρ c p . Calculate the effective properties if each of the boards and plates has a thickness of 2.36 mm and the following thermophysical properties: board (b) ρ = 1000 k g / m 3 , c p , b = 1500 J / k g ⋅ K , k b = 0.30 W / m ⋅ K ; plate ( p ) ρ p = 8000 k g / m 3 , c p , p = 480 J / k g ⋅ K , k p = 12 W / m ⋅ K .
Solution Summary: The author explains the temperature at the midpoint of the shell thickness.
Copper-coated, epoxy-filled fiberglass circuit boards are treated by heating a stack of them under high pressure, as shown in the sketch. The purpose of the pressing—heating operation is to cure the epoxy that bonds the fiberglass sheets, imparting stiffness to the boards. The stack, referred to as a book, is comprised of 10 boards and 11 pressing plates, which prevent epoxy from flowing between the boards and impart a smooth finish to the cured boards. In order to perform simplified thermal analyses, it is reasonable to approximate the book as having an effective thermal conductivity (k) and an effective thermal capacitance
ρ
c
p
. Calculate the effective properties if each of the boards and plates has a thickness of 2.36 mm and the following thermophysical properties: board (b)
ρ
=
1000
k
g
/
m
3
,
c
p
,
b
=
1500
J
/
k
g
⋅
K
,
k
b
=
0.30
W
/
m
⋅
K
; plate (p )
ρ
p
=
8000
k
g
/
m
3
,
c
p
,
p
=
480
J
/
k
g
⋅
K
,
k
p
=
12
W
/
m
⋅
K
.
The cartel dimensions of a vehicle are 0.6m long, 0.2m wide and 0.1m high, and the crankcase surface temperature is 350K. Calculate the heat loss flow rate from the crankcase to the atmosphere where the ambient air temperature is 276K while this vehicle is traveling at 30km/h.
It is aimed to produce frozen potatoes in a newly established business. The entry temperature of the cleaned potato to the system is -16 °C, and the desired temperature to reach 10 °C. For this purpose, a refrigerant at -25 °C will be used. In the freezing process, potatoes of certain sizes are placed in the ice cream basket, the basket is immersed in the tank containing the refrigerant and kept during freezing. A cooling system is designed around the tank and 1M Joule per hour removes heat from the tank to keep the temperature of the tank constant at -25 °C. It is desirable to produce potatoes of different shapes. These shapes are spheres with a diameter of 20 mm, a cube with dimensions of 16x16x16 mm and a rectangular prism with a diameter of 12x12x25 mm. In such a process,a. What should be used as refrigerant?b. What is the daily production capacity for each product?c. What would you recommend to increase production capacity?
In a solar collector 1 m wide by 4 m long, the glass cover plate at an average temperature of 29°C is spaced 40 mm from the absorber plate at an average temperature of 75°C. Estimate the convection heat loss coefficient from the absorber plate to the glass when the collector is positioned horizontally. What is the convection heat loss coefficient if the spacing reduced to 10 mm?
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