Mercet Boiler Essay

310 Words2 Pages
Marcet Boiler Aim: To obtain the relationship between pressure and temperature of saturated steam and to compare the obtained values to the ones given in the steam tables. Apparatus: • Norwood electrically operated Marcet Boiler • Thermometer (range 0oC-350oC); • Barometer • Pressure gauge Diagram: Method: The apparatus was set up as shown in the diagram of the marcet boiler above. 1 litre of water was poured into the marcet Boiler. The boiler was switched on the filler port open. Once steam starts to leave the marcet boiler, the filler port is closed. The temperature from the thermometer and the pressure from the pressure gauge were recorded as the water kept heating up. The boiler was later switched off and cooled more rapidly with the help of a fan. The temperature and pressure was recorded again. The atmospheric pressure from the barometer was also recorded. Results: Atmospheric Pressure = 766.20 mmhg = 1.02 bar Absolute Pressure (bar) T1(heating) (oC) T2(cooling)( oC) +1.0/-1.0 +1.0/-1.0 2.02 116 120 3.02 129 134 4.02 140 144 5.02 149 154 6.02 157 161 7.02 163 167 8.02 168 173 9.02 174 177 Precautions: • Readings from the barometer and the thermometer were read at eye level, to avoid parallel errors. • The thermometer pocket was filled with oil to increase thermal conductivity. • The marcet boiler was not touched with bare hands since it could be hot. Conclusion The results from the first reading while heating to the second reading while cooling varied slightly due to human errors and random errors. The values taken where fairly similar to those in the steam tables. The best thing to do is to let the boiler cool on its own rather than use the fan, this way the temperature reading on the thermometer would be more

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