FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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number 1 A food product containing 82% moisture content is being frozen. Estimate the specific heat of the product at -8 ° C when 82% of the water is frozen. The specific heat of the dry product is 2.5 kJ / (kg ° C). It is assumed that the specific heat of water at -10 ° C is the same as the specific heat of water at 0 ° C, and that the specific heat of ice follows the function Cp es = 0.0062 T Frozen + 2.0649.
Cp of frozen product = kJ / kg ° C.
(b) An experimental balloon filled with helium is equipped with meteorological
instruments is released to the atmosphere from sea level. Measurement data was
analysed to derive the linear temperature lapse rate up to high altitudes above sea
level. The lapse rate was found to be equal to 0.0065 K/m. Estimate the altitude of the
balloon above sea level when the atmospheric pressure is equal to 60 kPa.
Atmospheric temperature and pressure at sea level may be assumed to be equal to
15°C and 101 kPa. Characteristic gas constant is 287J/kgK.
Air (its gas constant is 287 J/kg.k)
escapes from a tank at a temperature of 55
C and specific internal energy of u= 7508
J/kg, what will be its enthalpy (J/kg)?
Select one:
a. 101644.00
b. 21644.00
c. 61644.00
d. 41644.00
e. 81644.00
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