Thermodynamics Change in Internal Energy?

In summary, the closed, rigid tank initially contains 2 kg of water in a two-phase liquid-vapor mixture at T1 = 70°C. The system undergoes heat transfer until it reaches a final state of saturated vapor at T2 = 120°C. The heat transfer for this process is determined by subtracting the specific internal energy of the final state from the specific internal energy of the initial state, multiplied by the mass, resulting in a value of -466.5 kJ, which is not given as one of the answer choices.
  • #1
Ricardeo Xavier
5
0

Homework Statement


A closed, rigid tank contains 2 kg of water, initially a two phase liquid–vapor mixture at T1 = 70°C. Heat transfer occurs until the tank contains only saturated vapor at T2 = 120C.
Determine the heat transfer for the process, in kJ.
answer choices:
3701kJ
119.4kJ
4835kJ
1558kJ

Homework Equations


Steam Tables
ΔU=Q-W(W=0)

The Attempt at a Solution


Since we know T1, we can use the tables to identify the specific internal energy of saturated liquid and gas and add them together to find u1. We can also do the same with T2 but neglecting the specific internal energy of fluid since it is only a saturated vapor at this point. Subtract u2 from u1 then multiply by the mass. Since it is a rigid tank we can also neglect work done. Here is my work:
Q=m(u2-u1)
Q=2kg(2529.3kJ/kg - (292.95kJ/kg+2469.6kJ/kg))
Q=-466.5kJ (this answer is not given as one of the choices so i am assuming that it is wrong)
 
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  • #2
Nevermind i figured it out. I did this completely wrong
 

FAQ: Thermodynamics Change in Internal Energy?

What is thermodynamics change in internal energy?

Thermodynamics change in internal energy refers to the change in the total energy of a system that is due to the transfer of heat or work. It is a measure of the system's ability to do work or release heat.

How is thermodynamics change in internal energy calculated?

The thermodynamics change in internal energy is calculated as the sum of the change in kinetic energy and the change in potential energy within a system. It can also be calculated using the formula Q - W, where Q represents the heat added to the system and W represents the work done by the system.

What are the different types of thermodynamics change in internal energy?

There are two types of thermodynamics change in internal energy: endothermic and exothermic. Endothermic changes occur when heat is absorbed by a system, resulting in an increase in internal energy. Exothermic changes occur when heat is released by a system, resulting in a decrease in internal energy.

What factors affect thermodynamics change in internal energy?

The thermodynamics change in internal energy is affected by various factors such as temperature, pressure, and the type of material. For example, increasing the temperature of a gas will result in an increase in internal energy, while decreasing the pressure will result in a decrease in internal energy.

How is thermodynamics change in internal energy related to the first law of thermodynamics?

The first law of thermodynamics states that energy cannot be created or destroyed, only converted from one form to another. The thermodynamics change in internal energy is a direct reflection of this law, as it shows the conversion of energy in a system through heat transfer or work done.

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