Write the simplified ENERGY BALANCE equation for each process based on the given conditions. Start from the general energy balance form, and arrive at the correct balance by explaining any addition, deduction, or change in the equation. Use the following as subscripts in your answer: 1 = initial system state; 2 = final system state; i = inlet state, e = exit state. a. A rigid tank transferring heat to its surroundings. b. The seal of an insulated system with a high energy substance is broken, causing the contents to be evacuated until only 20% of the initial internal energy remained. No heat transfer was detected in the system’s boundaries. c. Consider a hydroelectric power plant operating in steady conditions, wherein the system consists of two water reservoirs with a height difference Δz, with a Francis water turbine placed between the stream connecting both.
Write the simplified ENERGY BALANCE equation for each process based on the given
conditions. Start from the general energy balance form, and arrive at the correct balance by
explaining any addition, deduction, or change in the equation.
Use the following as subscripts in your answer: 1 = initial system state; 2 = final system state; i = inlet
state, e = exit state.
a. A rigid tank transferring heat to its surroundings.
b. The seal of an insulated system with a high energy substance is broken, causing the contents to
be evacuated until only 20% of the initial internal energy remained. No heat transfer was detected
in the system’s boundaries.
c. Consider a hydroelectric power plant operating in steady conditions, wherein the system consists
of two water reservoirs with a height difference Δz, with a Francis water turbine placed between
the stream connecting both.
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