Question

Use the steam tables to determine the required heat input (MW) if a continuous stream flowing at 250.0 kg/s undergoes the process at constant pressure.

a) Work
b) Energy
c) Heat
d) Temperature

Answer 1

In thermodynamics, heat (option c) is the energy transfer between a system and its surroundings due to a temperature difference. Therefore,the correct Option is Option (c) Heat.

Step-by-step explanation:

To determine the required heat input, we need to consider the change in enthalpy (ΔH) of the continuous stream. Since the process is at constant pressure, the heat input is equal to the change in enthalpy. The steam tables provide information about the enthalpy of water at different temperatures and pressures. By finding the enthalpy values at the initial and final states of the process, we can calculate the heat input using the formula:

Heat Input =
`\text{Mass Flow Rate} * (\text{Enthalpy}_{\text{final}} - \text{Enthalpy}_{\text{initial}})`

where the mass flow rate is given as 250.0 kg/s.

It's important to note that enthalpy is a measure of the total energy of a system, including both internal energy and the product of pressure and volume. Therefore, in a constant-pressure process, the change in enthalpy directly represents the heat added or removed from the system.

By consulting the steam tables and applying the given mass flow rate, one can accurately determine the required heat input for the specified process.

Therefore,the correct Option is Option (c) Heat.