Ground cherry seeds need to be planted at a depth of 1-cm below the surface and will only germinate if their surrounding soil is at a temperature of 24-30°C. Farmer Joe wants to know whether adding straw mulch (mulch = 0.05 W/m K, Lmulch = 10 cm) on top of his soil will increase the odds of germination. The topsoil in Deleware is sandy loam (soil = 0.5 W/m K), with a thickness of 1 m. Immediately beneath the topsoil is the subsoil, which is at a constant temperature of Tsubsoil = 10°C. You can assume that the air in Deleware is fairly calm, with a heat transfer coefficient of h = 10 W/m².K. deleware (a) Sketch the system (with and without mulch), labeling all temperatures, dimensions, and proportionality constants. You may assume that the subsoil, topsoil, mulch, and air are at steady state. You should have two sketches. On separate graphs, sketch the heat flux and temperature as a function of position (from the air to the subsoil), with and without mulch. Make sure that your sketches reflect that the system is at steady-state and account for the relative magnitudes of the thermal conductivities and heat transfer coefficient. You don't need to calculate any temperatures for these graphs. T Should Farmer Joe use mulch when he plants his seeds? [Hint: Find the lowest air (d) temperature needed in for the seeds to germinate with and without mulch. As a first step, find the temperature at the air-topsoil interface necessary for germination. Then calculate the corresponding temperature of the air in Deleware Deleware
Ground cherry seeds need to be planted at a depth of 1-cm below the surface and will only germinate if their surrounding soil is at a temperature of 24-30°C. Farmer Joe wants to know whether adding straw mulch (mulch = 0.05 W/m K, Lmulch = 10 cm) on top of his soil will increase the odds of germination. The topsoil in Deleware is sandy loam (soil = 0.5 W/m K), with a thickness of 1 m. Immediately beneath the topsoil is the subsoil, which is at a constant temperature of Tsubsoil = 10°C. You can assume that the air in Deleware is fairly calm, with a heat transfer coefficient of h = 10 W/m².K. deleware (a) Sketch the system (with and without mulch), labeling all temperatures, dimensions, and proportionality constants. You may assume that the subsoil, topsoil, mulch, and air are at steady state. You should have two sketches. On separate graphs, sketch the heat flux and temperature as a function of position (from the air to the subsoil), with and without mulch. Make sure that your sketches reflect that the system is at steady-state and account for the relative magnitudes of the thermal conductivities and heat transfer coefficient. You don't need to calculate any temperatures for these graphs. T Should Farmer Joe use mulch when he plants his seeds? [Hint: Find the lowest air (d) temperature needed in for the seeds to germinate with and without mulch. As a first step, find the temperature at the air-topsoil interface necessary for germination. Then calculate the corresponding temperature of the air in Deleware Deleware
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Ground cherry seeds need to be planted at a depth of 1-cm below the surface and will only
germinate if their surrounding soil is at a temperature of 24-30°C. Farmer Joe wants to know
whether adding straw mulch (mulch = 0.05 W/m K, Lmulch = 10 cm) on top of his soil will
increase the odds of germination.
The topsoil in
Deleware
is sandy loam (soil = 0.5 W/m K), with a thickness of 1 m.
Immediately beneath the topsoil is the subsoil, which is at a constant temperature of Tsubsoil =
10°C. You can assume that the air in Deleware is fairly calm, with a heat transfer coefficient
of h
= 10 W/m².K.
deleware
(a) Sketch the system (with and without mulch), labeling all temperatures, dimensions, and
proportionality constants. You may assume that the subsoil, topsoil, mulch, and air are at
steady state. You should have two sketches.
On separate graphs, sketch the heat flux and temperature as a function of position (from
the air to the subsoil), with and without mulch. Make sure that your sketches reflect that
the system is at steady-state and account for the relative magnitudes of the thermal
conductivities and heat transfer coefficient. You don't need to calculate any
temperatures for these graphs.
T
Should Farmer Joe use mulch when he plants his seeds? [Hint: Find the lowest air (d)
temperature needed in
for the seeds to germinate with and without mulch. As
a first step, find the temperature at the air-topsoil interface necessary for germination.
Then calculate the corresponding temperature of the air in
Deleware
Deleware
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