DUBLIN INSTITUTE OF TECHNOLOGY
Marcet Boiler
Thermodynamics Lab
Name: Shiyas Basheer
No: D10119909
Date: 3/19/2012
Course: DT022/2
Table of Contents
Aim: ....................................................................................................................................................... 2
Apparatus:........................................................................................................................................... 2
Procedure:........................................................................................................................................... 2
Results: ................................................................................................................................................. 3
Conclusion: ......................................................................................................................................... 4
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Marcet Boiler
Aim: To show the connection between pressure and temperature of saturated steam.
Apparatus: A marcet boiler was used. It was provided with a pressure gauge, Digital
thermometer and a safety valve. The main elements of the WL 204 unit were: 
The stainless steel steam boiler with a mineral wool insulating jacket.

The filler opening to pour water into the boiler.

The overflow valve to ensure the vessel was filled to the correct level.

The drain valve to drain the vessel.

An electric heater bolted on to the floor of the boiler.

A manometer fitted on the lid of the boiler to provide a direct indication of the boiler
pressure.

A temperature sensor

A safety valve, a digital display, a master switch and a heater switch to switch the
heater on and off.
Schematic:
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Procedure: Before starting the experiment a quick inspection was performed to
ensure the unit is in proper operating condition. The boiler was filled before the unit
was run for the first time. The water was heated and brought to the boiling point with
the overflow valve opened. When the steam was seen coming from the overflow
valve it was closed. This was to ensure that there was no air in the boiler. With the
valve shut the boiler was further heated and the pressure was raised. Temperature
corresponding to the various pressures was recorded at 0.5 bar intervals up to 15-bar
pressure.
Results:
Pressure, P (bar)
Temperature, T
Saturated
temperature, T
Gauge
Absolute
0C
K
0C
K
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
9.5
10
10.5
11
11.5
12
12.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
9.5
10
10.5
11
11.5
12
12.5
13
13.5
102
106.8
115.2
123.1
129.4
134.4
139.6
143.9
147.6
151.7
155
158.2
160.9
164
166.5
169.1
171.3
173.8
175.7
177.8
179.8
182.1
183.8
185.5
187.3
188.8
375.15
379.95
388.35
396.25
402.55
407.55
412.75
417.05
420.75
424.85
428.15
431.35
434.05
437.15
439.65
442.25
444.45
446.95
448.85
450.95
452.95
455.25
456.95
458.65
460.45
461.95
99.6
111.4
120.2
127.4
133.5
138.9
143.6
147.9
151.8
155.5
158.8
372.75
384.55
393.35
400.55
406.65
412.05
416.75
421.05
424.95
428.65
431.95
Average
Temp. K
237.375
245.675
254.275
261.825
268.025
273.225
278.175
282.475
286.275
290.175
293.475
165
438.15
299.525
170.4
443.55
305.025
175.4
448.55
309.925
179.9
453.05
314.375
184.1
457.25
318.525
188
461.15
322.475
191.6
464.75
326.025
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13
13.5
14
14
14.5
15
190.5
192.2
193.7
463.65
465.35
466.85
195
468.15
329.325
198.3
471.45
332.575
Conclusion:
In this experiment, the relationship between pressure and temperature is found to be
directly proportional. When compared to the theoretical result, the experimental result
shows a small deviation between them because of certain errors. The percentage of
error ranged from 0.3% to 44% which can validate this experiment.
Pressure Gauge
Thermometer
Vent valve
Insulation
Bunsen burner
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