Question

A stream of water vapor flowing at a rate of 260.0 mol/h is brought from 600.0°C and 10 bar to 400.0°C and 1 atm.

Estimate the required cooling rate (a positive number in kW) three ways.

Use five significant figures in your calculations.

(i) from the steam tables

Entry field with incorrect answer

kW

(ii) using heat capacity data in Table B.2

Entry field with incorrect answer

kW

(iii) using the enthalpy function of APEx (or Table B.8)

Entry field with incorrect answer

kW

Answer #1

A stream of water vapor flowing at a rate of 240.0 mol/h is
brought from 700.0 °C and 10 bar to 100.0 °C and 1 atm.
Find
Estimate the required cooling rate (a positive number in kW)
three ways.
Use five significant figures in your calculations.
(i) from the steam tables
____ kW
(ii) using heat capacity data in Table B.2
____ kW
(iii) using the enthalpy function of APEx (or Table
B.8)
____ kW

A stream of water vapor flowing at a rate of 425 mol/h is
brought from 700.0 °C and 10 bar to 400.0 °C and 1 atm. Using Steam
Tables, Estimate the required cooling rate (in kW). Use five
significant figures in your calculations.

A stream of water vapor flowing at a rate of 250 mol/h is
brought from 600C to 100C. Estimate the required cooling rate (kW)
using heat capacity data in Table B.2

saturated steam at 300 C is used to heat countercurrently
flowing stream of methanol vapor from 65C to 260 C in and adiabatic
heat exchanger. The flow rate of the methanol is 5500 standard
liters per minute, and the steam condenses and leaves the heat
exchanger as liquid water at 90 C.
A) calculate the required flow rate of the entering steam in
m^3/min.
B) Calculate the rate of heat transfer from the water to the
methanol (kW).

An oil stream flowing at a rate of 60 m3 /h (?oil = 952.9 kg/m3
), at temperature of 10°C is to be heated to 175°C+/-0.5°C in a
heat exchanger using high pressure saturated steam. (a) With the
aid of the steam tables appended to this paper determine the
minimum pressure required of a saturated steam stream to achieve
this result? [5%] (b) If the actual temperature of the condensing
steam is to be 15°C?0.5°C above the minimum what is...

1) A nozzle is a device for increasing the velocity of a
steadily flowing stream of fluid. At the inlet to a certain nozzle
the enthalpy of the fluid is 3025 kJ/kg and the velocity is 60 m/s.
At the exit from the nozzle the enthalpy is 2790 kJ/kg. The nozzle
is horizontal and there is negligible heat loss from
it.
(i) Find the velocity at the nozzle exit.
(ii) If the inlet area is 0.1 m2 and specific volume...

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