Answer:
a)mass flow=6lbm/s
b)the temperature at the compressor exit= 1269◦F
Explanation:
Hello!
To solve this problem we will perform the following steps
1.Use thermodynamic tables to find the density and entalpy of the air using the properties of temperature and pressure (2 psia and 77.3 ° F)
Density = 0.06032 lbm / ft ^ 3
h1=entalpy=351.2Btu/lbm
2.
Calculate the mass flow by multiplying the flow by the density, remember to apply conversion factors
3.We apply first law of thermodynamics in the compressor, it establishes that the energy that enters a system is the same that must come out.
Energies entering the compressor =
-Electric power (800hp)
=W=565.65btu/s
-flow energy (mh1)
energies coming out of the compressor
-heath= (Q)(m
)
-flow energy (mh2)
applying the above we have the following energy balance equation
W+mh1=Qm+mh2
Our goal is to determine the value of the enthalpy of output h2 in order to find the air temperature using thermodynamic tables
4.finally we use thermodynamic tables to find the temperature using enthalpy
T2=1269◦F
Djd hdjf jdjfjfjfj jdjfjfjfj jdjfjfjfj jdjfjfjfj jdjfjfjfj jdjfjfjfj
Explanation:
Thermodynamics system :
Thermodynamics system is a region or space in which study of matters can be done.The system is separated from surroundings by a boundary this boundary maybe flexible or fixed it depends on situations.The out side the system is called surroundings.
Generally thermodynamics systems are of three types
1.Closed system(control mass system)
Only energy transfer take place ,no mass transfer take place.
2.Open system(control volume system)
Both mass as well as energy transfer take place.
3.Isolated system
Neither mass or nor energy transfer take place.
At steady state ,property is did not changes with respect to time.
Answer:
Explanation:
A tension or current expressed in cosine form and with a positive sign can be converted directly into a phasor. This is done by indicating the tension and the offset angle:
So:
You can sum the phasors simply using a calculator, however, let's do it manually:
Let's find the rectangular form of each phasor using the next formulas:
For
So:
For
So:
Hence:
Finally:
Answer:
Independent, dependent
Explanation:
The mediation conditions are what affect anxiety hence anxiety is dependent on mediation. The main aim of the researcher is to see how anxiety levels of people vary depending on the meditation. In this case, meditation conditions are independent variables. Therefore, it's proper to conclude that the meditation vs no meditation conditions are independent variables while anxiety is dependent variable