Question

Draw and label a temperature distribution diagram for a liquid‐to‐liquid, counter flow heat exchanger. What advantage(s) does this type of heat exchanger provide? What disadvantage(s)?

Answer #1

Cold water enters a counter flow heat exchanger at 20ºC at a
rate of 10 kg/s, where it is heated by a hot water stream that
enters the heat exchanger at 80ºC at a rate of 2 kg/s. Assuming the
specific heat of water to remain constant at Cp=4.18 kJ/(kg.ºC),
determine the maximum heat transfer rate and the outlet
temperatures of the cold and the hot water streams.

A thin-walled double pipe counter flow heat exchanger is to be
used to cool oil (cp = 2200 j/kg*K) from 150 ℃ to 30 ℃ at a rate of
2.1 kg/s by water (cp= 4180 J/kg*K) that enters at 20 ℃ at a rate
of 1.2 kg/s. The diameter of the tube is 2.5 cm, and its length is
10 m.
Using Excel (a) Determine the overall heat transfer coefficient
of this heat exchanger. (b) Investigate the effects of oil...

Hot water enters a counter-flow double-pipe heat exchanger at
180F with a velocity of 5 ft/s. Cold water at 80F flows at 3 ft/s
in the outer section of the exchanger. The diameter of the inner
pipe is 1 inch, the pipe wall thickness is 1/8", and the outer pipe
diameter is 2 inches. The overall heat transfer coefficient times
area per unit length UA/L = 150 Btu/hr-ft-F. If the exchanger is 16
feet long, what is the exit temperature...

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...

If it wasn't possible to change flow direction in a
heat exchanger, what would you need to do instead to produce a
parallel flow that produces a smaller heat transfer than that of
the counter flow?

A counter current double pipe heat exchanger is used to boil but
not superheat water at 100 DegreeC at rate of about 0.1 kg/s. This
is achieved by flowing hot oil at 400 DegreeC through the inner
pipe at a rate of 5 kg/s.
Latent heat of water: 2265 kJ/kg
Heat capacity of water: 4180 J/kgK
Heat capacity of the oil: 1800 J/kgK
What is the temperature of he hot oil leaving the heat
exchanger?
What is the overall 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...

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...

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