(a) State the First Law of Thermodynamics. [1] (b) Consider a generic closed system with all...

 

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(a) State the First Law of Thermodynamics. [1] (b) Consider a generic closed system with all the possible forms of energy transfer occurring in it. By applying the first law of Thermodynamics, show the necessary steps to obtain the following constitutive equation where the variables have their usual meaning. [4] Q +W = m(u; -u,)+m(C, -C;')+mg(z, - z,) net (c) A steam turbine in a power station develops 1200 kW power. The amount of heat supply into the boiler is 2200 kJ/kg, and the heat rejection from the condenser is 1900 kJ/kg. The power required to pump the steam to the boiler is 10 kW. Consider the system is stationary and neglect the change of internal energy. i. Applying the First Law of Thermodynamics, calculate the rate at which steam circulates through the network of the power plant. [6] ii. Explain how the flow rate will be affected if the power demand is changed. Also, how this will affect the heat transfer process within the systems. [4] (a) State the First Law of Thermodynamics. [1] (b) Consider a generic closed system with all the possible forms of energy transfer occurring in it. By applying the first law of Thermodynamics, show the necessary steps to obtain the following constitutive equation where the variables have their usual meaning. [4] Q +W = m(u; -u,)+m(C, -C;')+mg(z, - z,) net (c) A steam turbine in a power station develops 1200 kW power. The amount of heat supply into the boiler is 2200 kJ/kg, and the heat rejection from the condenser is 1900 kJ/kg. The power required to pump the steam to the boiler is 10 kW. Consider the system is stationary and neglect the change of internal energy. i. Applying the First Law of Thermodynamics, calculate the rate at which steam circulates through the network of the power plant. [6] ii. Explain how the flow rate will be affected if the power demand is changed. Also, how this will affect the heat transfer process within the systems. [4]