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Vanyuwa [196]
3 years ago
11

A colorful design for a product meant to appeal to a preschool audience reflects which of the following points in industrial des

ign?
usability
appeal to emotion
maintenance
effective use of resources
Engineering
1 answer:
lord [1]3 years ago
6 0
Appeal to emotion

the product doesn’t need to be colorful to function but it would be more appealing to the intended audience if it was
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A freezer is maintained at 20°F by removing heat from it at a rate of 75 Btu/min. The power input to the freezer is 0.70 hp, and
Igoryamba

Answer:

Explanation:

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TL = low temperature of freezer = 20 °F

TH = temperature of air around = 75 °F

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W actual, power input = 0.7 hp

conversion on F to kelvin = (T (°F) + 460 ) × 5 / 9

COP ( coefficient of performance) reversible = (20 + 460) × 5/9 / (5/9 ( ( 75 +460) - (20 + 460) ))

COP reversible = 480 / 55 = 8.73

irreversibility expression, I = W actual - W rev

COP r = QL / Wrev

W rev = QL /  COP r  where 75 Btu/min = 1.76856651 hp  where W actual = 0.70 hp

a) W rev =  1.76856651 hp  /  8.73  = 0.20258 hp is reversible power

I = W actual - W rev

b) I = 0.7 hp - 0.20258 hp = 0.4974 hp

c) the second-law efficiency of this freezer = W rev / W actual =  0.20258 hp / 0.7 hp = 0.2894 × 100 = 28.94 %

8 0
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Consider a fully developed flow in a circular pipe (negligible entrance effects), how does the convective heat transfer coeffici
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8 0
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