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Marcet boiler experiment, Lab Reports of Thermofluid Systems

University of Zambia Thermofluid Systems

This lab report contains information about marcet boilers

Typology: Lab Reports

2020/2021

Uploaded on 05/30/2022

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DEPARTMENT OF MECHANICAL ENGINEERING TECHNOLOGY

Faculty of Engineering and Built Environment

UNIVERSITY OF JOHANNESBURG

Doornfontein Campus

Title: Marcet Boiler Experiment

Mbatha MC

(219007543)

A Semester Report submitted

in partial fulfilment of the requirements for the module

STEAM PLANT (SPLM1B2)

B. ENG TECH (BENG(TECH))

Engineering: Mechanical

LECTURER: Mr Bakaya-Kyahuwa

Date: 06 October 2020

Discover Lab Reports of Thermofluid Systems University of Zambia

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DEPARTMENT OF MECHANICAL ENGINEERING TECHNOLOGY

Faculty of Engineering and Built Environment

UNIVERSITY OF JOHANNESBURG

Doornfontein Campus

Title: Marcet Boiler Experiment

By

Mbatha MC

A Semester Report submitted

in partial fulfilment of the requirements for the module

STEAM PLANT (SPLM1B2)

B. ENG TECH (BENG(TECH))

Engineering: Mechanical

LECTURER: Mr Bakaya-Kyahuwa

Date: 06 October 2020

I Mbali Christabel Mbatha (Student number: 219007543 ) am a student registered for BEngTech in Mechanical

Engineering in the year 2020. I hereby declare the following:

I am aware that plagiarism (the use of someone else’s work without their permission and/or without acknowledging the original source) is wrong.
I confirm that ALL the work submitted for assessment for the above course is my own unaided work except where I have explicitly indicated otherwise.
I have followed the required conventions in referencing the thoughts and ideas of others.
I understand that the University of Johannesburg may take disciplinary action against me if there is a belief that this is not my own unaided work or that I have failed to acknowledge the source of the ideas or words in my writing.

Signature: _________________________ Date: 06 /10/

Objective:

The objective of this experiment is to obtain the slope of temperature and pressure of saturated

steam for water between 0 and 10 bars and to compare the values calculated to those found on

the published steam tables.

Introduction:

Thermodynamics is the study of the effect of work, heat and energy on a system and its

surroundings, and the relationship between heat and other forms of energy. It is concerned with

change in the properties of fluids.

An ideal gas obeys the general gas equation that relates the pressure, specific volume or density,

and absolute temperature with mass of molecule and the gas constant, R. The equation is based

on the assumptions that: the gas particles are constantly moving and they collide with container

walls to cause pressure, they have a negligible volume in comparison to the gas molecules,

there is no interaction between the particles and average kinetic energy between them is

proportional to the temperature. The equation is therefore interpreted as,

M

mRT PV =

SAT h

dT  = 

f g

SAT h h

T v v

−

and hf + hfg = hg  hfg = hg - hf

f g

SAT h

T v v

dT

where, vf = specific volume of water

vg = specific volume of steam

hf = enthalpy of water

hg = enthalpy of steam

hfg = latent heat of vaporization

A Marcet Boiler is an experimental apparatus that is used to determine the relationship between

pressure and temperature, and it can be used to verify the Antoine Equation.

Apparatus

Figure 1: A picture of a marcet boiler

Marcet Boiler:

▪ Safety Valve

▪ Boiler with insulating jacket

▪ Bourdon tube pressure gauge

▪ Switch cabinet with temperature display

▪ Drain Valve

▪ Heater

▪ Overflow

▪ Temperature sensor

Procedures:

Opened the level valve and switched on the power supply.
Set the temperature 'setpoint' to 180^0 C.
Ensured that there was no air trapped in the boiler.
Switched off the level valve and heated until the maximum gauge pressure reached 8 bars.
When the device is pressurized, the filler must not be removed or open level valve..
Reduced the temperature 'setpoint' to room temperature.
Recorded all temperature readings at different pressure settings of the boiler when the boiler

was heated and cooled.

Results

Attachments:

Atmospheric pressure : 742 mmHg

Atmospheric temperature : 15 (^0 C)

Slopemea=

𝑑𝑇 𝑑𝑃

Slopecal =

𝑇𝑣𝑔

ℎ𝑓𝑔

5 − 420. 5 ( 5 − 4. 5 )∗ 100

( 424. 5 )( 0. 3748 )

2109

Analysis of results

Figure 2: A graph showing the relationship between the absolute pressure and temperature

Discussion

Having air in the boiler could affect the accuracy of the results. Thus, it is

necessary to ensure that air is removed from the boiler. In the experiment,

sources of error might be caused by the measurement and reading accuracy and

calculations. The liquid absorbs heat energy causes it to change to vapour.

There will be an increase in pressure and temperature as the steam is not

allowed to exit the boiler. Industrial applications of Marcet Boiler include, hot

water boiler, gasifier, power generation and cooking utilities.

Conclusion

From the experiment, the relationship between the absolute pressure and

temperature is directly proportional. When comparing the theoretical slope and

the experimental slope, there seems to be a small variation in the values which

might have been caused by certain error during the experiment or calculations.

100

120

140

160

180

200

2 2,5 3 3,5 4 4,5 5 5,5 6 6,5 7 7,5 8 8,5 9

Temperature (oC)

Absolute pressure (bar)

Graph representing the relationship between absolute pressure and temperature

The percentage error between the calculated and measured slope ranges

between 1.83% to 22.9%. Apart from the variation in the values, the experiment

can be considered successful as all the objectives were achieved. Although,

repeating the experiment could improve the reliability and accuracy of the

results.

References

sarkawtn (2014). Marcet boiler. [online] Available at:

https://www.slideshare.net/ShwanSarwan/marcet-boiler [Accessed 27 Aug. 2020].

www.gunt.de. (n.d.). GUNT Gerätebau. [online] Available at:

https://www.gunt.de/en/?option=com_gunt&task=gunt.list.category&product_id=

9&Itemid=0.

Scribd. (2011). Marcet Boiler experiment. [online] Available at:

https://www.scribd.com/document/346891882/Marcet-Boiler-experiment [Accessed

27 Aug. 2020].

uj.blackboard.com. (n.d.). Blackboard Learn. [online] Available at:

https://uj.blackboard.com/ultra/courses/_33300_1/cl/outline [Accessed 27 Aug. 2020].

TecQuipment. (2018). SATURATED STEAM - THE MARCET BOILER -

SATURATED STEAM - THE MARCET BOILER. [online] Available at:

https://www.tecquipment.com/saturated-steam-the-marcet-boiler.

Marcet boiler experiment, Lab Reports of Thermofluid Systems

Related documents

Partial preview of the text

Download Marcet boiler experiment and more Lab Reports Thermofluid Systems in PDF only on Docsity!

DEPARTMENT OF MECHANICAL ENGINEERING TECHNOLOGY

Faculty of Engineering and Built Environment

UNIVERSITY OF JOHANNESBURG

Doornfontein Campus

Title: Marcet Boiler Experiment

By

Mbatha MC

A Semester Report submitted

in partial fulfilment of the requirements for the module

STEAM PLANT (SPLM1B2)

B. ENG TECH (BENG(TECH))

Engineering: Mechanical

LECTURER: Mr Bakaya-Kyahuwa

Date: 06 October 2020

Objective:

Introduction:

M

and hf + hfg = hg  hfg = hg - hf

dT

Apparatus

▪ Safety Valve

▪ Boiler with insulating jacket

▪ Bourdon tube pressure gauge

▪ Switch cabinet with temperature display

▪ Drain Valve

▪ Heater

▪ Overflow

▪ Temperature sensor

Procedures:

Results

Analysis of results

Discussion

Having air in the boiler could affect the accuracy of the results. Thus, it is

necessary to ensure that air is removed from the boiler. In the experiment,

sources of error might be caused by the measurement and reading accuracy and

calculations. The liquid absorbs heat energy causes it to change to vapour.

There will be an increase in pressure and temperature as the steam is not

allowed to exit the boiler. Industrial applications of Marcet Boiler include, hot

water boiler, gasifier, power generation and cooking utilities.

Conclusion

From the experiment, the relationship between the absolute pressure and

temperature is directly proportional. When comparing the theoretical slope and

the experimental slope, there seems to be a small variation in the values which

might have been caused by certain error during the experiment or calculations.

The percentage error between the calculated and measured slope ranges

between 1.83% to 22.9%. Apart from the variation in the values, the experiment

can be considered successful as all the objectives were achieved. Although,

repeating the experiment could improve the reliability and accuracy of the

results.

References