Engineering, 12.03.2020 06:18 coopera1744

Refrigerant-134a at 400 psia has a specific volume of 0.1384 ft3/lbm. Determine the temperature of the refrigerant based on (a) the ideal-gas equation, (b) the generalized compressibility chart, and (c) the refrigerant tables.

Answers: 3

Show answers

Answers

Answer from: rosyjesus297

The temperature based on ideal gas is T = 526 R

The temperature based on compressibility chart is T = 694 R

The temperature based on refrigerant tables is T = 700 R

Explanation:

From the mathematical relation of an ideal gas we can define the temperature of the Refrigerant-134a as follows

$T = \frac{Pv}{R}$

Where is the pressure of the refrigerant and given as = 400 psia

v is the volume of the refrigerant and it is given as = 0.1384 ft^3/lbm

R is the gas constant and has a value of $0.1052\ psia \ \cdot ft^3/lbm \ \cdot R$ for Refrigerant-134a

Substituting values

$T = \frac{(400psia)(0.1384\ ft^3/lbm)}{0.1052 pais \cdot ft^3/lbm \cdot R}$

= 526 R

Considering the generalized compressibility chart

looking at table of molar mass, gas constants and critical-point properties.The temperature of Refrigerant-134a denoted by $T_{cr}$ is 673.6 R and the critical pressure of Refrigerant-134a is 588.7 psia

Mathematically the reduced pressure is

$P_R = \frac{P}{P_{cr}}$

substituting given and value obtained from table

$P_R = \frac{400psia}{588.7psia} =0.679$

The pseudo-reduced specific volume is Mathematically given as

$V_R = \frac{v_{actual}}{RT_{cr}/P_{cr}}$

$Substituting \ 588.7\ psia \ for \ P_{cr} \ 673.6\ R \ for \ T_{cr} \ 0.1052\ psia \ \cdot \ ft^3 /lbm \cdot R\\\\ \ for \ R \ 0.1384ft^3/lbm \ for \ v_{actual}$

$V_R = \frac{0.1384}{(0.1052)(673.6)/588.7} = \frac{(0.1384)(588.7)}{(0.1052)(673.6)} =1.15$

Now the value of pseudo-reduced specific volume and reduced pressure would gives us a pointer to select the correct value of reduced temperature( T_R ) from the generalized compressibility chart

and this is 1.03 for T_R

Hence the temperature of the Refrigerant-134a

$T = T_R T_{cr}$

Substituting values

T = (1.03)(673.6 R)

$= 694\ R$

Considering the refrigerant tables

looking at the table of super-heated Refrigerant-134a the temperature for a pressure of 400 psia and

specific volume of 0.1384ft^3/lbm is 240°F

Converting to Rankine scales we add 460

$T = 240 +460 = 700\ R$

Answer from: Quest

In a fire lane/near a fire hydrantat any curb/ramp for persons with disabilitiesbeside another parked vehicle (double parking)within an intersection

Answer from: Quest

answer:

explanation:

assault rifle is a rapid-fire, magazine-fed rifle designed for military use. it is a shoulder-fired weapon that allows the shooter to select between semi-automatic (requiring you pull the trigger for each shot), fully automatic (hold the trigger and the gun continuously fires) or three-shot-burst modes.

Another question on Engineering

Engineering, 04.07.2019 18:10

Which of the following components of a pid controlled accumulates the error over time and responds to system error after the error has been accumulated? a)- proportional b)- derivative c)- integral d)- on/off.

Answers: 2

Answer

Engineering, 04.07.2019 18:10

Journeyman training is usually related (clo2) a)-to specific tasks b)-to cost analysis of maintenance task c)-to control process to ensure quality d)-to installation of machinery

Answers: 2

Answer

Engineering, 04.07.2019 18:20

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?

Answers: 3

Answer

Engineering, 04.07.2019 18:20

Atank with constant volume contains 2.27 kg of a mixture of water phases (liquid-vapor). in the initial state the temperature and the quality are 127 °c and 0.6, respectively. the mixture is heated until the temperature of 160 oc is reached. illustrate the process in a t-v diagram. then, determine (1) the mass of the vapor in kg at the initial state, (2) the final pressure in kpa.

Answers: 3

Answer

You know the right answer?

Refrigerant-134a at 400 psia has a specific volume of 0.1384 ft3/lbm. Determine the temperature of t...

Questions