A thermal energy storage unit consists of a large rectangular channel, which is well insulated on its outer surface and encloses alternating layers of the storage material and the flow passage. Each layer of the storage material is an aluminum slab of width W = 0.05 m , which is at an initial temperature of 25°C. Consider conditions for which the storage unit is charged by passing a hot gas through the passages, with the gas temperature and the convection coefficient assumed to have constant values of T ∞ = 600 ° C and h = 100 W / m 2 ⋅ K throughout the channel. How long will it take to achieve 75% of the maximum possible energy storage? What is the temperature of the aluminum at this time?
A thermal energy storage unit consists of a large rectangular channel, which is well insulated on its outer surface and encloses alternating layers of the storage material and the flow passage. Each layer of the storage material is an aluminum slab of width W = 0.05 m , which is at an initial temperature of 25°C. Consider conditions for which the storage unit is charged by passing a hot gas through the passages, with the gas temperature and the convection coefficient assumed to have constant values of T ∞ = 600 ° C and h = 100 W / m 2 ⋅ K throughout the channel. How long will it take to achieve 75% of the maximum possible energy storage? What is the temperature of the aluminum at this time?
Solution Summary: The author explains the percentage increase in heat transfer associated with the attaching rectangular aluminium fins.
A thermal energy storage unit consists of a large rectangular channel, which is well insulated on its outer surface and encloses alternating layers of the storage material and the flow passage.
Each layer of the storage material is an aluminum slab of width
W
=
0.05
m
, which is at an initial temperature of 25°C. Consider conditions for which the storage unit is charged by passing a hot gas through the passages, with the gas temperature and the convection coefficient assumed to have constant values of
T
∞
=
600
°
C
and
h
=
100
W
/
m
2
⋅
K
throughout the channel. How long will it take to achieve 75% of the maximum possible energy storage? What is the temperature of the aluminum at this time?
A thermal energy storage unit consists of a large rectangular channel, which is wellinsulated on its outer surface and encloses alternating layers of the storage material andthe flow passage.Each layer of the storage material is an aluminum slab of width ? = 0.05 m, which is at aninitial temperature of 25°C. Consider conditions for which the storage unit is charged bypassing a hot gas through the passages, with the gas temperature and the convectioncoefficient assumed to have constant values of ?∞ = 600°C and ℎ = 100 W/m2– Kthroughout the channel. How long will it take to achieve 75% of the maximum possibleenergy storage? What is the temperature of the aluminum at this time?
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?
a 12.7cm diameter duct is maintained at a constant temperature of 245c by hot combustion gases flowing inside the duct. The duct is located horizontally in a warehouse area having an ambient temp of 15C. Calculate the length of the duct necessary to provide 36630W of convection heating. neglect heat transfer due to radiation. write assumptions and draw a sketch
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