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Lab 3 marcet boiler

The steam from the valve was allowed to come out Lab 3 marcet boiler 30 seconds before the valve was closed. Most thermodynamics substances such as gases and vapours are often referred as P-V-T substances.

The first law of Thermodynamics The first law of thermodynamics states that energy can be neither created nor destroyed during a process; it can only change forms. As mentioned, since there is no heat supplied externalleft hand side of the equation becomes zero as stated in Equation 9. Electric Heater It heats the steam to the required temperature inside the insulated boiler. Equation 5 Substituting Equation 3 into Equation 5 Equation 6 During the process of heating, the Equation 6 becomes Equation 7 Taking into account Equation 4, Equation 8 Where, the net power supplied by the boiler.

The power supply of V is applied on the boiler so as to acquire a constant power of 2 kW to run the experiment smoothly. When energy is added within water, the increasing of activities among the molecules caused the increase in the number of molecule escape from the surface until an equilibrium state is reached. However, at certain points, the values are not the same. The change in setting affects the experimentally obtained values and hence the theoretically calculated values are also altered.

Equation 2 So the net work done and the net heat supplied sums up to the change in internal energy. Discussion The practical values obtained is represented graphically and analyzed in the above section and is often compared to the standard values found in the steam tables. It is known that error is unavoidable in any experiment. When the liquid absorbed enough heat energy, it will change to vapour form.

The state of equilibrium depends on the pressure between the water surface and steam. The saturated steam may drastically decrease the accuracy of the experiment. This can be explained as in this experiment. The error shows more deviation in the cooling graph but in the heating graph it is seen that the error seems to increase as the pressure increase.

The apparatus called marcet boiler heats up the steam which raise the temperature and pressure. The traces of steam remaining in the boiler can give results that are prone to error.

Equation 1 where W is the net work input measured in kJ Q is the net heat measured in kJ As in the first law, the system is subjected to a complete thermodynamics cycle, the change in internal energy is zero. Sources of errors are measurements or reading accuracy, room temperature and pressure, the stability of materials and calculations. The temperature controller was set at Discussion It is necessary to remove air form the boiler as this could affect the accuracy of the experimental results. They are mentioned below 1. Make sure the safety valve is closed before starting to heat. Before starting the experiment a quick inspection was performed to ensure the unit is in proper operating condition.

Stop watch The stop watch is used to precisely measure the time required to reach a certain temperature.marcet boiler experiment presented by naveen valil (h) thermodynamics lab report submitted to dr. peter kew mechanical engineering science 6 date of. Marcet boiler units are usually used in classroom demonstrations and lab experiments to understand the relationship between the changes of temperature and pressure and their effects on the boiling point of water (equilibrium state).

Lab Manual ABSTRACT Marcet Boiler is a bench top unit designed for the demonstration of the basic principal of boiling phenomenon to study the relationship between the pressure and temperature of saturated steam in equilibrium with water. This experiment was also conducted to demonstrate the vapour.

Lab 3 Marcet Boiler Essay EXPERIMENT 3 MARCET BOILER OBJECTIVE • To obtain a relationship between the pressure and temperature of saturated steam, in equilibrium with water, at all pressure between atmospheric and 10 bar ( lb/in2). 

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