The temperature controller for a clothes dryer consists of a bimetallic switch mounted on an electrical heater attached to a wall-mounted insulation pad. The switch is set to on at 70°C, the maximum dryer air temperature. To operate the dryer at a lower air temperature, sufficient power is supplied to the heater such that the switch reaches 70°C ( T s e t ) when the air temperature Tis less than T s e t . If the convection heat transfer coefficient between the air and the exposed switch surface of 3 0 mm 2 is 25 W/m 2 ⋅ K , how much heater power P e is required when the desired dryer air temperature is T ∞ = 50 ° C ?
The temperature controller for a clothes dryer consists of a bimetallic switch mounted on an electrical heater attached to a wall-mounted insulation pad. The switch is set to on at 70°C, the maximum dryer air temperature. To operate the dryer at a lower air temperature, sufficient power is supplied to the heater such that the switch reaches 70°C ( T s e t ) when the air temperature Tis less than T s e t . If the convection heat transfer coefficient between the air and the exposed switch surface of 3 0 mm 2 is 25 W/m 2 ⋅ K , how much heater power P e is required when the desired dryer air temperature is T ∞ = 50 ° C ?
The temperature controller for a clothes dryer consists of a bimetallic switch mounted on an electrical heater attached to a wall-mounted insulation pad.
The switch is set to on at 70°C, the maximum dryer air temperature. To operate the dryer at a lower air temperature, sufficient power is supplied to the heater such that the switch reaches 70°C
(
T
s
e
t
)
when the air temperature Tis less than
T
s
e
t
. If the convection heat transfer coefficient between the air and the exposed switch surface of
3
0
mm
2
is
25
W/m
2
⋅
K
, how much heater power
P
e
is required when the desired dryer air temperature is
T
∞
=
50
°
C
?
Discuss briefly the different types of heat loads which have to be taken into account in order to estimate the total heat load of a large restaurant for summer air conditioning?
Which of the three air-conditioning possible systems listed below should be used to maintain the indoor temperature of a house at 20°C while resulting in a daily lower operating cost when the outdoor temperature is -2°C. Based on the construction of the house you estimate that under the given indoor and outdoor temperatures the rate of heat loss to the surroundings is 17 kJ/s. Which system would you recommend as a feasible alternative? Support your answer for each one of the cases below with convincing computations that show which one of the systems is requires the minimum electrical power while being in compliance with the first and second law of thermodynamics. a. Electrical heating b. A heat pump with COPHP = 3.0 c. A heat pump with COP = 14.0
Answer this ASAP,thx
Furnace walls are lined with 3 layers of firebrick with a thickness of 6 in (k=0.95 Btu/h.ft.°F), insulating brick (k-0.4 Btu/h.ft.°F) and common brick (k=0.8 Btu /h.ft.°F) Firebrick inlet temperature, T₁ = 1800°F, maximum insulating brick temperature, T₂ = 1720°F and T3 = 280°F.
1. Calculate the thickness of the insulating brick layer.
2. If the common brick is 9 in., calculate the exit temperature.
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