Answer:
X=0.194
T=-33.6C
Explanation:
Hello!
To solve this problem use the following steps!
1. We will call the expansion valve inlet 1 and exit 2
2.Through laboratory tests, thermodynamic tables were developed, these allow to know all the thermodynamic properties of a substance (entropy, enthalpy, pressure, specific volume, internal energy etc ..)
through prior knowledge of two other properties such as pressure and temperature.
3. Find the enthalpy of state 1 using pressure and temperature using thermodynamic tables
h1=Enthalpy(Ammonia;T=24C;P=1000kPa)=312.9KJ/kg
4. An expansion valve is a device which does not have heat or work exchange which means that the enthalpy of state one is equal to that of state 2, so using thermodynamic tables uses the pressure of state 2 and enthalpy of state 1 to find quality and temperature
x2=Quality(Ammonia;P=100kPa;h=h1=312.9KJ/kg)
=0.194
T2=Temperature(Ammonia;P=100kPa;h=h1=312.9KJ/kg)=-33.6C
Answer:
A 3-phase, 50 Hz, 110 KV overhead line has conductors
Explanation:
hope it will helps you
Answer:
When a pilot pushes the top of the right pedal, it activates the brakes on the right main wheel/wheels, and when the pilot pushes the top of the left rudder pedal, it activates the brake on the left main wheel/wheels. The brakes work in a rather simple way: they convert the kinetic energy of motion into heat energy.
Answer:
(b) an equivalent AC current source in parallel with an equivalent reactance
Explanation:
The Norton AC equivalent circuit is composed of a Norton current service as the source, and it is in parallel to a Norton resistor, which can be valid for any type of load. Norton equivalent circuit is valid for a single frequency in AC circuits.
Answer:
The true statements are statements 1 and 4.
Explanation:
1. Heavier atoms possess greater entropy at a given temperature than lighter atoms- True.
Concerning atomic substances, heavier atoms possess greater entropy at a given temperature than lighter atoms, which is a result of the relation between a particle's mass and the spacing of quantized translational energy levels.
2. The weight of an atom has no effect on entropy - False.
The entropy of a substance increases with its molecular weight, complexity, and with temperature.
3. Molecules with greater numbers of atoms are associated with lower entropy - False.
Any chemical reaction that increases the number of molecules also increases entropy as a chemical reaction that increases the number of molecules would be a reaction that pours energy into a system.
4. The entropy of a substance is influenced by the structure of the particles that comprise the substance - True.
The structure of the particles (atoms or molecules) in a substance influences its entropy.
For molecules, greater numbers of atoms (regardless of their masses) increase how the molecules can vibrate and thus the number of possible microstates and the system entropy.