Question

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 the operating pressure of the steam supply? [5%] (c) If the specific heat capacity of the oil is given by the following relationship,Cp=1.8+2.5x10^-3T+3x10^-6T^2 kJ/kg T is in degrees Celsius determine the heat requirements to raise the temperature of the oil. [30%] (d) If the exiting steam from the heat exchanger at the operating pressure of (b) above is made up of 25% steam and the balance is liquid water, determine the steam mass and volumetric flow rates to the heat exchanger. [40%] (e) If the exchanger was designed to bring about complete condensation of the steam how much steam would now be required?

Answer #1

Methane enters a heat e xchanger at a volumetric flow rate of
145.0 m 3 /min, at an absolute pressure of 1.013 bar and
temperature of 15.0°C. At these conditions, the specific enthalpy
of methane is - 23.181 kJ/kg. The methane leaves the heat exchanger
at an absolute pressure of 1.0 13 bar and temperature of 60.0°C.
The corresponding specific enthalpy at these conditions is 78.656
kJ/kg. The methane is heated by a stream of saturated steam
entering the heat...

Oil enters a counterflow heat exchanger at 600 K with a mass
flow rate of 10 kg/s and exits at 350 K. A separate stream of
liquid water enters at 20°C, 5 bar. Each stream experiences no
significant change in pressure. Stray heat transfer with the
surroundings of the heat exchanger and kinetic and potential energy
effects can be ignored. The specific heat of the oil is constant,
c = 2 kJ/kg · K.
If the designer wants to ensure...

Oil enters a counterflow heat exchanger at 525 K with a mass
flow rate of 10 kg/s and exits at 275 K. A separate stream of
liquid water enters at 20°C, 5 bar. Each stream experiences no
significant change in pressure. Stray heat transfer with the
surroundings of the heat exchanger and kinetic and potential energy
effects can be ignored. The specific heat of the oil is constant, c
= 2 kJ/kg · K. If the designer wants to ensure...

Oil enters a counterflow heat exchanger at 525 K with a mass
flow rate of 10 kg/s and exits at 275 K. A separate stream of
liquid water enters at 20°C, 5 bar. Each stream experiences no
significant change in pressure. Stray heat transfer with the
surroundings of the heat exchanger and kinetic and potential energy
effects can be ignored. The specific heat of the oil is constant, c
= 2 kJ/kg · K. If the designer wants to ensure...

Problem #1
Saturated steam at 300°C is used to heat a counter-currently
flowing stream of methanol vapor from 65°C to 260°C in an adiabatic
heat exchanger. The flow rate of the methanol is 5500 standard
liters per minute (at STP), and the steam condenses and leaves the
heat exchanger as liquid water at 90°C.
a) Draw a diagram of the process.
b) Calculate the required flow rate of the entering steam in
m3/min.
c) Calculate the rate of heat transfer...

1) Water is heated by steam in a heat exchanger. The water comes
in at .4 MPa and 10°C and leaves at 110°C. flow rate of the water
is 2 kg/s. 0.5 kg of steam comes in at a pressure of 0.6 MPa at
300°C, determine the exit temperature and state of the steam and
rate of condensation if any

A heat exchanger uses oil
(cp = 1880 J kg-1 K-1) at an
initial temperature of 205°C to heat up water with heat capacity of
1 kcal kg-1 K-1, and density = 0.998 g
cm-3, flowing at 0.00376 m3 min-1
from 16°C to 44°C. The configuration of the heat exchanger is in
countercurrent. The oil mass flow rate is 270 kg
h-1.
(1 cal = 4.18 J)
(i) What is the heat
transfer area required for an overall heat transfer...

Saturated water vapor leaves a steam turbine at a flow rate of
1.47 kg/s and a pressure of 0.51 bar. The vapor is to be completely
condensed to saturated liquid in a shell-and-tube heat exchanger
that uses city water as the cold fluid. The water enters the
thin-walled tubes at 17oC and is to leave at 57.6
oC. Assuming an overall heat transfer coefficient of
2000 W/m2K, determine the required heat exchanger
surface area and the water flow rate. cp,c...

Saturated steam at a gauge pressure of 3.00 bar is to be used to
heat a stream of ethane. The ethane enters a heat exchanger at 16°C
and 1.5 bar gauge pressure at a rate of 895 m3/min and
is heated at constant pressure to 93°C. The steam condenses and
leaves the exchanger as a liquid at 24.0°C. The specific enthalpy
of ethane at the given pressure is 941 kJ/kg at 16°C and 1073 kJ/kg
at 93°C.
You may take...

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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