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suter
29 days ago
11

An 80-L vessel contains 4 kg of refrigerant-134a at a pressure of 160kPa. Determine (a) the temperature, (b) the quality, (c) th

e enthalpy of the refrigerant, and (d) the volume occupied by the vapor phase.
Engineering
1 answer:
grin007 [219]29 days ago
7 0

Answer:

Temperature -15.6 C, quality x=0.646, enthalpy h=667.20 KJ, vapor phase volume Vg=79.8 L

Explanation:

Refer to the property table for R-134a.

https://www.ohio.edu/mechanical/thermo/property_tables/R134a/R134a_PresSat.html

At a pressure of 160 KPa, the temperature is -15.66 C.

Quality means x equals the mass of vapor divided by the total mass of the liquid-vapor mixture.

Alternatively: x=(v-vf)/(vg-vf) where v is the total volume, which is "80L" or 0.08 cubic meter.

vf is the volume of the liquid phase and vg is the volume of the vapor phase. These values correspond to 160 KPa.

x=(0.08-0.0007437)/(0.1235-0.0007437)=0.646

Enthalpy

h=hf+xhfg where hf and hfg values are at 160 KPa.

h=hf+xhfg=31.2+0.646(209.9)=166.80 KJ/Kg.

For 4Kg of R-134a, h=m(166.80 KJ/Kg)=667.20 KJ.

Volume of vapor phase

vg at 160Kpa=0.1235 cubic meter for quality=1.

For quality=0.646, this will occupy 64.6% of the vapor phase at quality=1.

The vapor phase volume=0.646*0.1235=0.0798 cubic meter which equals 79.8 L.

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Consider a process carried out on 1.00 mol of a monatomic ideal gas by the following two different pathways.
grin007 [219]

Answer:

90 L.atm

Explanation:

According to the provided details:

First pathway:

A( 3 atm, 20 L) → C ( 1 atm, 20 L) → D (1 atm, 50 L)

Second pathway:

A(3 atm, 20 L) → B( 3 atm, 50 L) → D ( 1 atm, 50 L)

As the number of moles is 1.00 moles

To calculate wAB;

A → B signifies the transformation is happening at a steady pressure;

Thus,

wAB = pressure multiplied by the change in volume

wAB = P(V₂ - V₁)

wAB = 3 atm (50 L - 20 L)

wAB = 3 atm (30 L)

wAB = 90 L.atm

7 0
17 days ago
PDAs with two stacks are strictly more powerful than PDAs with one stack. Prove that 2-stack PDAs are not a valid model for CFLs
iogann1982 [279]

Answer:

?pooooooooooooooooooooooop

Explanation:

?pooooooooooooooooooooooop

6 0
2 days ago
Number pattern Write a recursive method called print Pattern() to output the following number pattern. Given a positive integer
alex41 [274]

Response:

Refer to the explanation

Clarification:

Code:

import java.util.Scanner;

public class NumberPattern {

public static int x, count;

public static void displayNumPattern(int num1, int num2) {

if (num1 > 0 && x == 0) {

System.out.print(num1 + " ");

count++;

displayNumPattern(num1 - num2, num2);

} else {

x = 1;

if (count >= 0) {

System.out.print(num1 + " ");

count--;

if (count < 0) {

System.exit(0);

}

displayNumPattern(num1 + num2, num2);

}

}

}

public static void main(String[] args) {

Scanner scnr = new Scanner(System.in);

int num1;

int num2;

num1 = scnr.nextInt();

num2 = scnr.nextInt();

displayNumPattern(num1, num2);

}

}

See attached example output

3 0
19 days ago
Read 2 more answers
A bar of 75 mm diameter is reduced to 73mm by a cutting tool while cutting orthogonally. If the mean length of the cut chip is 7
mote1985 [204]

Answer:

r=0.31

Ф=18.03°

Explanation:

Provided:

Original diameter of bar = 75 mm

Diameter post-cutting = 73 mm

Average diameter of the bar d= (75+73)/2=74 mm

Average length of uncut chip = πd

Average length of uncut chip = π x 74 =232.45 mm

Thus, cutting ratio r

Cutting\ ratio=\dfrac{Mean\ length\ of cut\ chip}{Mean\ length\ of uncut\ chip}

r=\dfrac{73.5}{232.45}   r=0.31

Therefore, the cutting ratio equals 0.31.

Now, the shearing angle is given as

tan\phi =\dfrac{rcos\alpha }{1-rsin\alpha }

Next by substituting the values

tan\phi =\dfrac{rcos\alpha }{1-rsin\alpha }

tan\phi =\dfrac{0.31cos15 }{1-0.31sin15 }\

Ф=18.03°

Concluding, the shearing angle is 18.03°.

4 0
1 month ago
A cylinder in space is of uniform temperature and dissipates 100 Watts. The cylinder diameter is 3" and its height is 12". Assum
Kisachek [217]

Answer:

Temperature T = 394.38 K

Explanation:

The full solution and detailed explanation regarding the above question and its specified conditions can be found below in the accompanying document. I trust my explanation will assist you in grasping this particular topic.

7 0
1 day ago
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