Question
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500 kmol/h of an air stream at a pressure of 2 atm is to be heated...
500 kmol/h of an air stream at a pressure of 2 atm is to be heated from 15 celsius to 90 celsius in a heat exchanger with 600 kPa steam condensing in the shell side of the heat exchanger. Steam enters the exchanger as a saturated vapor and leaves as a saturated liquid.
A) How much steam would be required if a conventional heat
exchanger were used? what is the total entropy change during this
process?
B) How much steam would be required if the process of heating the
air was carried out by using the heat transferred from the steam to
drive a reversible carnot engine and by using the air stream as the
heat sink? what would be the total work output of this engine?
Solutions
Amanda K answered 2 years agoRelated Solutions
An air stream is saturated with a vapor (B) at 130F and 1 atm pressure. It...
An air stream is saturated with a vapor (B) at 130F and 1 atm
pressure. It is cooled down to 80F where some of the B is
condensed and separated from the vapor stream. The remaining vapor
stream is then reheated back to 130F.
a. What is the mole fraction of B in the air coming out of the
process?
b. For an inlet flow rate of 2000 ft3/min of air saturated
with B, what would be the flow rate...
As 2 moles of sirenite is heated under a constant pressure of 1 atm it undergoes...
As 2 moles of sirenite is heated under a constant pressure of 1
atm it undergoes a solid phase transition, at a temperature of 750
K, from α-sirenite to β-sirenite. The molar specific heat capacity
of sirenite varies with thermodynamic temperature, T, such that Cvm
= 2.50 x 10-6 T^2 Jmol-1K-1.
a) Calculate the entropy change of the sirenite between the
transition temperature of 750 K and room temperature (300 K).
b) By what factor does the number of accessible...
If a sample of A(g) at 2.10 atm is heated to 500K, what is the pressure...
If
a sample of A(g) at 2.10 atm is heated to 500K, what is the
pressure of B(g) at equilibrium?
2A(g)--> B(g)
Kp=8.74*10^-5 at 500 K
500 kgmol/h of a gas stream containing 2% of component A is to be purified using...
500 kgmol/h of a gas stream containing 2% of component A is to
be purified using gas absorption. The vent from the absorber can
contain no more than 0.5 kgmol/h of A. Two scrubbing liquids, P and
Q, are available.
a. For liquid Q, m=0.45. How many stages are required in the
scrubber for 1.5 times the minimum liquid rate? The incoming Q
contains no A. 2
b. For liquid P, m=0.25. If liquid P is used in the scrubber...
A stream of carbon dioxide flows at a rate of 15.0 kmol/h. Use the truncated-viralequation-of-state to...
A stream of carbon dioxide flows at a rate of 15.0 kmol/h. Use
the truncated-viralequation-of-state to find the volume flow-rate
at 60.0 atm and 70.0 oC.
A stream of carbon dioxide flows at a rate of 15.0 kmol/h. Use the truncated-viralequation-of-state to...
A stream of carbon dioxide flows at a rate of 15.0 kmol/h. Use
the truncated-viralequation-of-state to find the volume flow-rate
at 60.0 atm and 70.0 oC.
Air at 480Kpa is expanded adiabatically to a pressure of 94Kpa. It is then heated at...
Air at 480Kpa is expanded adiabatically to a pressure of 94Kpa.
It is then heated at constant volume until it again attains its
temperature, when the pressure is found to be 150KPa. it then
undergoes an isothermal compression to return the air to its
original state. Using this information sketch the p-v diagram and
calculate the value of γ. If the initial temperature of air is
190oC determine the work done per kg during the
adiabatic expansion and teh isotherman...
A mixture of isobutylene (0.350 atm partial pressure at 500 K) and HCl(0.550 atm partial pressure...
A mixture of isobutylene (0.350 atm partial pressure at 500 K)
and HCl(0.550 atm partial pressure at 500 K) is allowed to reach
equilibrium at 500 K. What are the equilibrium partial pressures of
tert-butyl chloride, isobutylene, and HCl?
The equilibrium constant KpKp for the gas-phase thermal
decomposition of tert-butyl chloride is 3.45 at 500
K:
(CH3)3CCl(g)⇌(CH3)2C=CH2(g)+HCl(g)
1 kmol/h of a feed stream containing 15, 45 and 40 mol% of nitrogen, n-butane and...
1 kmol/h of a feed stream containing 15, 45 and 40 mol% of
nitrogen, n-butane and n-pentane at 500 ºC and an unknown pressure,
is cooled isobarically to a temperature of 105 ºC and fed into a
flash drum operating at the same temperature (105 ºC) and pressure.
If the vapor fraction V/F in the drum is equal to 0.5, determine
the pressure at which the flash drum operates, and the flow rates
and composition of both streams leaving the...
A process stream flowing at 35 kmol/h contains 15 mole% H2 and the remainder 1-butene. The...
A process stream flowing at 35 kmol/h contains 15 mole% H2 and
the remainder 1-butene. The stream pressure is 10.0 atm absolute,
the temperature is 50 oC and the velocity is 150 m/min. Determine
the diameter (cm) of the pipe transporting this stream, using Kay’s
rule in your calculations.
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