Question

A hot fluid of specific heat 4100 J/kg K flows through a parallel flow heat exchanger at the rate of 3.5 kg/min with an inlet temp. of 105C. A cold fluid of specific heat 2350 J/kg K flows in at a rate of 9 kg/min and with inlet temperature 25C. Make calculations for maximum possible effectiveness if the fluid flow conforms to parallel flow arrangement.

Answer #1

A process fluid having a specific heat of 3500 J/kg?K and
flowing at 2 kg/s is to be cooled from 80 °C to 40 °C with chilled
water, which is supplied at a temperature of 15 °C and a flow rate
of 2.5 kg/s. Assuming an overall heat transfer coefficient of 2000
W/m2?K, calculate the required heat transfer areas for the
following exchanger configurations: (a) Parallel flow; (b) Counter
flow; (c) a 1-2 shell and tube exchanger with the water...

A parallel flow heat exchanger is used to transfer heat from hot
water at 80oC, flowing at 5 L/min to cold water at
15oC which is flowing at a rate of 15 L/min. The overall
heat transfer coefficient is 2000 W/m2oC and the area is
0.2m2.
Calculate the heat transfer rate, the outlet temperature of the
cold water.

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) Fluid at a mass flow rate of 0.352 kg/s flows through a tube
with a diameter of 15 mm and a length of 25 m. The inner surface of
the tube is heated with a uniform heat flux of 1000 W/m2.
Measurements shown that the inlet temperature of the fluid is 30
˚C. Assume the outer surface of the tube is perfectly insulated.
Consider the thermophysical properties of the fluid are as follows:
density ρ = 1000 kg/m3, specific...

A heat recovery unit in a factory uses a shell-in-tube counter
flow type unit to recover heat from a flow of hot fluid to preheat
water for the factory. The hot fluid enters at 88°C and a flow rate
of 25 kg/minute, and exits at 55°C. The cold water will enter the
heat exchanger at 15°C and exit at 55°C. Take cHot-fluid = 3000
J/kg.K, cwater = 4200 J/kg.K.
PART (b)
An air to water heat exchanger with an effectiveness...

1. Calculate the thermoeconomic cost of the produced electricity
using the internal combustion device described in homework 7. with
and without the heat exchanger. Use the results you calculated to
answer this question. This question is focusing on the
thermoeconomic costs. The electricity is produced for 10 hours a
day, five days per week during a one year cycle.
The following cost information is given for the internal
combustion device. The cost of the device is $125,000 and it has...

Assuming the specific heat of water is 4200 J/kg/K and the
specific heat of aluminum is 900 J/Kg/K, what is the increase of
the system's entropy by the time it will reach equilibrium in
temperature if it is 160 grams of aluminum at 370 deg. K in a cup
of 1.3 kg of water at 281 deg. K

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...

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...

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