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Law Incorporation [45]
3 years ago
14

A heat engine receives 1000kJ/s of heat from a high temperature source at 600◦C and rejects heat to a cold temperature sink at 2

0◦C a. What is the thermal efficiency of this engine? b. What is the power delivered by the engine in watts? c. At what rate is heat rejected to the cold temperature sink?
Engineering
1 answer:
scoray [572]3 years ago
5 0

Answer:

(A)  the thermal efficiency of this engine is 66.44 %

(B)  the power delivered by the engine in watts is 664,400 W

(C) The rate at which heat is rejected to the cold temperature sink is 335.6 kJ/s.

Explanation:

Given;

Input Heat received by the engine, P_{in} = 1000 kJ/s

hot temperature, T_H = 600 ⁰C = 600 + 273 = 873 K

cold temperature, T_C = 20 ⁰C = 20 + 273 = 293 K

(A)  the thermal efficiency of this engine;

\eta = 1 - \frac{T_C}{T_H} \\\\\eta = 1 - \frac{293}{873} \\\\\eta = 1 - 0.3356\\\\\eta = 0.6644 = 66.44 \%

(B) the power delivered by the engine in watts;

P = \eta P_{in}\\\\P = 0.6644 \times \ 1000kJ/s \ \times \ \frac{1\ kW}{1\ kJ/s} \\\\P = 664.4 \ kW \\\\P = 664,400 \ W

(C)  The rate at which heat is rejected to the cold temperature sink;

Q_C = Q_H(1-\eta)\\\\Q_C = 1000\ kJ/s(1-0.6644)\\\\Q_C = 335.6 \ kJ/s

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The project is going to scope if the situation happens. Option A is correct.

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Hence option A is correct.

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2 years ago
A 600 MW power plant has an efficiency of 36 percent with 15
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Answer:

401.3 kg/s

Explanation:

The power plant has an efficiency of 36%. This means 64% of the heat form the source (q1) will become waste heat. Of the waste heat, 85% will be taken away by water (qw).

qw = 0.85 * q2

q2 = 0.64 * q1

p = 0.36 * q1

q1 = p /0.36

q2 = 0.64/0.36 * p

qw = 0.85 *0.64/0.36 * p

qw = 0.85 *0.64/0.36 * 600 = 907 MW

In evaporation water becomes vapor absorbing heat without going to the boiling point (similar to how sweating takes heat from the human body)

The latent heat for the vaporization of water is:

SLH = 2.26 MJ/kg

So, to dissipate 907 MW

G = qw * SLH = 907 / 2.26 = 401.3 kg/s

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Answer:

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Explanation:

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For each of the stages of product life cycle, those 4p should be use appropriately.

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The growth stage:

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the Mature stage:

At this stage, the consumer are fully aware of the product. wide range of location are reach. the pricing has reach its peak. Profit have been maximized. And, competitors of the product are in the market. Corporate social responsibility (CSR) will be the promotional value at this stage.

The Declining stage:

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