A steel tank contains water at ? = 1.00 MPa and ℎ = 3100 kJ/kg.
Determine the following:
a. State of the water; ie whether the water is compressed water
or saturated water or superheated vapour? (Hint: Use Saturated
water—Pressure table to compare ℎ at ? = 1.00 MPa)
b. Estimate the temperature of the water. (Hint: Use Saturated
water—Pressure table or Superheated water, depending on the state
you find in a)
c. Other properties of water in the tank...
Water at 700 oC has a specific volume of 0.02600m3/kg. Determine
the pressure of the water based on a) ideal gas equation, b) the
generalized compressibility chart and c)the steam tables. (d)
Determine the error involved in cases (a) & (b).
Determine the activation energy in kJ/mol for a first order
reaction if its specific rate constant 8.30e-05 s-1 at
350.0 K and 3.25e+01 s-1 at 560.0 K.
Ea = ______ kJ/mol
A) What is the specific internal energy of water at 50 kPa and
190°C? Use data from the steam tables. The specific internal energy
of water is ___ kJ/kg.
B) What is the specific volume of R-134a at 20°C and 730 kPa?
What is the internal energy at that state? Use data from the steam
tables.
The specific volume is ___m3/kg.
The internal energy is ___kJ/kg.
Determine
how much
energy in kJ would be transferred if 300.0 grams
of steam (gaseous
water) at 150.0
̊C
is cooled to ice
(solid water)
at -20.0
̊C.
The specific
heat
of steam is
1.86
J/(g∙ ̊C),
the
specific heat
of ice is 2.06
J/(g∙ ̊C),
the heat of fusion of water
is 333
J/g, and
the heat
of vaporization is 2256 J/g.
Determine the lower heating value, in kJ per kmol of fuel and in
kJ per kg of fuel, at 25 oC, 1 atm for \
(a) Gaseous ethane (C2H6).
(b) Liquid ethanol (C2H5OH).