A heat exchanger manufacturer has provided us a quote on a specific heat exchanger. The design characteristics of this H-X are: A = Heat transfer surface area (ft²) h = Heat transfer coefficients (Btu/hr- ft2°F) n Surface efficiency Gas Side 23,000 15.0 0.88 Air Side 15,000 45 0.78 a. Calculate the H-X effectiveness using the & -NTU method, assuming unmixed cross flow. Neglect wall resistance in calculation of U. Also calculate the leaving gas and air temperatures. b. Does the design meet the required value of = 0.75? c. Briefly outline the procedure to show how to do the rating problem using the LMTD method. Show the necessary equations Assume constant properties and use the properties given in the first table for problem

A heat exchanger manufacturer has provided us a quote on a specific heat exchanger. The design characteristics of this H-X are: A = Heat transfer surface area (ft²) h = Heat transfer coefficients (Btu/hr- ft2°F) n Surface efficiency Gas Side 23,000 15.0 0.88 Air Side 15,000 45 0.78 a. Calculate the H-X effectiveness using the & -NTU method, assuming unmixed cross flow. Neglect wall resistance in calculation of U. Also calculate the leaving gas and air temperatures. b. Does the design meet the required value of = 0.75? c. Briefly outline the procedure to show how to do the rating problem using the LMTD method. Show the necessary equations Assume constant properties and use the properties given in the first table for problem

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Heat Exchangers

Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.

Heat Exchanger

The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.

Question

. The gas turbine operating conditions are:
Turbine Exhaust
805
Temperature (°F)
Pressure (psia)
Flow rate (lbm/hr)
Density (lbm/ft³)
Specific heat (Btu/lbm °F)
0.259
A cross flow plate fin compact heat exchanger is to be used for this heat recovery
application.
16.1
196,000
Compressor Discharge
0.0316
347
132
193,000
0.4380
0.251

A heat exchanger manufacturer has provided us a quote on a specific heat exchanger.
The design characteristics of this H-X are:
A Heat transfer surface area (ft²)
h = Heat transfer coefficients (Btu/hr-
ft2°F)
n = Surface efficiency
Gas Side
23,000
15.0
0.88
Air Side
15,000
45
0.78
a. Calculate the H-X effectiveness using the & -NTU method, assuming unmixed cross flow.
Neglect wall resistance in calculation of U. Also calculate the leaving gas and air temperatures.
b. Does the design meet the required value of = 0.75?
c. Briefly outline the procedure to show how to do the rating problem using the LMTD
method. Show the necessary equations
Assume constant properties and use the properties given in the first table for
problem

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Step 4: Heat transfer area and area correction factor

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A dairy farm needs to chill the milk from 39°C (extraction temperature is the same as the cow's body temperature) to at least 12°C for storage by using an existing 4-m long concentric-tube heat exchanger. The inner tube of the heat exchanger is 4 cm in diameter. The milk (density: 1035 kg/m³, specific heat: 3860 J/kg.K) flows into the heat exchanger at a rate of 270 liters per hour. On the cold side, there is a supply of water at 2°C at a rate of 0.23 kg/s. The estimated overall heat transfer coefficient of the heat exchanger is 1084.2 W/m².K. It was measured that the water comes out of the heat exchanger at 11°C. Is the milk indeed being cooled down to at least 12°C by heat exchanger as required by the farm? Looking at the temperatures obtained from your calculation, put an argument whether the heat exchanger is a parallel-flow or a counter-flow heat exchanger. Approximate specific heat of water is 4200 J/kg.K. Neglect radiation.
Below data was obtained from an experimental activity for a parallel pipe heat exchanger. Arrangement: counterflow (cold fluid in annular and hot fluid in tube). Mass flow rate: - Hot fluid: 1.03 kg/s - Cold fluid: 0.91 kg/s Temperatures: - Hot fluid inlet (Th.1): 80.5 +/- 10% °C - Hot fluid outlet (Th2): 64.0 +/- 10% °C - Cold fluid inlet (Te1): 20.0 +/- 10% °C - Cold fluid outlet (Tc2): 41.0 +/- 10% °C Assume cp constant and equal to 4.2 kJ/kg-K. 1. State assumptions (at least 9 unique ones) and include references. 2. What is the log mean temperature difference in °C? 3. What is the heat transfer rate on the cold side in kW? Heat added or lost on cold side? 4. What is the heat transfer rate on the hot side in kW? Heat added or lost on hot side? 5. What is the effectiveness of the heat exchanger for the given conditions? 6. Calculate the propagation of uncertaintv in kW for part 3 (heat transfer rate on the cold side) and part 4 (heat transfer rate on the hot side).