The ___________of the product is the extent to which the product meets the performance criteria.
Fill in the blank(s) with the appropriate word(s).
value
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Determine the heat transfer area requirements of Problem 10.40 if (a) 1-2 shell and tube, (b) an unmixed crossflow, and (c) a parallel flow heat exchanger are used, respectively.
GIVEN
• An air-to-gas heat exchanger
• Entering temperatures
? Ta,in = 350°C
? Tg,in = 700°C
• Mass flow rates: ma = mg = 5 kg/s
• Specific heats: cpa = cpg = 1.05 kJ/(kg K) = 1050 J/(kg K)
• Overall heat transfer coefficient (U) = 75 W/(m2 K)
FIND
The heat transfer area (A) as a function of the effectiveness (e) for (a) A 1-2 shell and tube heat exchanger (b) An unmixed crossflow heat exchanger (c) A parallel flow heat exchanger
ASSUMPTIONS
• For case (a) the air is in the tubes
SKETCH
Of the possible statements that parallel rays are brought to a focus by a 1)concave mirror,2)convex mirror,3)converging lens,4)diverging lens,the correct answer is
A. 1 and 2. B. 3 and 4. C. 1 and 3. D. 2 and 3. E. 2 and 4.
The theory that the collapse of a massive star's iron core produces neutrinos was supported by
a. the size and structure of the Crab nebula. b. laboratory measurements of the mass of the neutrino. c. the brightening of supernovae a few days after they are first visible d. underground counts from solar neutrinos. e. the detection of neutrinos from the supernova of 1987.
Which of the following contributes to Venus being so hot?
A) It is closer than Earth to the Sun. B) Its atmosphere is much denser than the Earth's. C) Its atmosphere is made chiefly of carbon dioxide. D) It has very little axial tilt so the equator is always directly exposed to the Sun. E) All of the above are factors.