No spacecraft has landed on a Jovian planet moon
Indicate whether the statement is true or false
FALSE
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The Greeks abandoned their earliest cosmological theory (planets moving in simple circles around Earth) because
A) it did not agree with their observations of the planets. B) it seemed messy and unsatisfying. C) they came to believe that Earth should be at the center of things. D) they came to believe that the sun should be at the center of things. E) Actually, they never did abandon or revise their earliest theory--it was not altered until the time of Copernicus.
Hot water is to be heated from 10 to 30°C, at the rate of 300 kg/s by atmospheric pressure steam in a single-pass shell-and-tube heat exchanger consisting of 1-in. schedule 40 steel pipe. The surface coefficient on the steam side is estimated to be 11,350 W/(m2 K). An available pump can deliver the desired quantity of water provided the pressure drop through the pipes does not exceed 15 psi. Calculate the number of tubes in parallel and the length of each tube necessary to operate the heat exchanger with the available pump.
GIVEN
Single-pass shell-and-tube heat exchanger Water is heated by atmosphere steam Water temperatures
? Tw,in = 10°C
? Tw,out = 30°C Water flow rate ( m w)= 300 kg/s Inner tube: 1 in. schedule 40 steel pipe Maximum water pressure drop (?p) = 15 psi = 103,422 N/m2 Steam side heat transfer coefficient ( oh ) = 11,350 W/(m2 K)
FIND
(a) The number of tubes in parallel (N)
(b) The length of each tube (L)
ASSUMPTIONS The tube is smooth The tube is 1% carbon steel Uniform pipe surface temperature Fully developed flow in pipe Water flow is turbulent to insure good heat transfer
SKETCH
PROPERTIES AND CONSTANTS
for 1 in. schedule 40 pipe
Inside diameter (Di) = 1.049 in. = 0.0266 m
Outside diameter (Do) = 1.315 in. = 0.0334 m
the saturation temperature of steam at 1 atm = 100°C
for water at the average temperature of 20°C
Absolute viscosity (?) = 993 × 10–6 Ns/m2
Density (?) = 998.2 kg/m3 Specific heat (cpw) = 4182 J/(kg K)
Thermal conductivity (kw) = 0.597 W/(m K)
Prandtl number (Pr) = 7.0,
the thermal conductivity of 1% carbon steel (ks) = 43 W/(m K).
The name of the transuranium element commonly used in smoke detectors is ______________
Fill in the blank(s) with correct word
The _____________ is 18 years and 11 1/3 days long
a. sidereal period b. synodic period c. eclipse season d. saros cycle e. eclipse year