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3 years ago

Match the word with the definition:

Engineering

2 answers:

aksik [14]3 years ago

7 0

1. Renewable Resources = (Renewable means you can keep making it) = resources that can be replenished (such as trees)

2. Nonrenewable Resources = ( Nonrenewable means it can't be made once it is used up) = resources that are gone once they are used (such as fossil fuels)

3. Producer = ( produces something) = person who makes goods or provides services

4. Consumer = ( uses something) = person whose wants are satisfied by using goods and services

5. Allocate = ( put someplace) = distribute

6. Choice = option

Pachacha [2.7K]3 years ago

3 0

Answer:

Those are by definition so I do not have any explanation.

Explanation:

person whose wants are satisfied by using goods and services

4. Consumer

resources that can be replenished (such as trees)

1. Renewable Resources

option

6. Choice

person who makes goods or provides services

3. Producer

resources that are gone once they are used (such as fossil fuels)

2. Nonrenewable Resources

distribute

5. Allocate

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Answer:

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b) The highest component surface is 132.22°C

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Explanation:

a) The properties of the air at 35°C:

p = density = 1.145 kg/m³

v = 1.655x10⁻⁵m²/s

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$m=\rho *V = 1.145*0.65=0.7443kg/min=0.0124kg/s$

The exit temperature is:

$T=T_{i} +\frac{Q}{m*c_{p} } =27+\frac{0.85*180}{0.0124*1007} =39.25$ °C

b) The mean fluid velocity is:

$V_{m} =\frac{V}{A} =\frac{0.65}{0.16*0.16} =25.4m/min=0.4232m/s$

The hydraulic diameter is:

$D_{h} =\frac{4A}{p} =\frac{4*0.16*0.16}{4*0.16} =0.16m$

The Reynold´s number is:

$Re=\frac{VD_{h} }{v} =\frac{0.4232*0.16}{1.655x10^{-5} } =4091.36$

Assuming fully developed turbulent flow, the Nusselt number is:

$Nu=0.023Re^{0.8} *Pr^{0.4} =0.023*4091.36^{0.8} *0.7268^{0.4} =15.69$

$h=\frac{k*Nu}{D_{h} } =\frac{0.02625*15.69}{0.16} =2.57W/m^{2} C$

The highest component surface temperature is:

$T=T_{e} +\frac{\frac{Q}{A} }{h} =39.2+\frac{0.85*\frac{180}{4*0.16*1} }{2.57} =132.22$ °C

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Answer:

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