(a)
The actual coefficient of performance of the refrigerator.
(a)

Answer to Problem 108P
The actual coefficient of performance of the refrigerator is
Explanation of Solution
Write the formula to calculate the mass flow rate of a refrigerant
Here, volume flow rate at inlet 1 is
Write the formula to calculate the power consumption of the compressor
Write the formula to calculate the refrigeration load
Here, heating load rate is
Write the formula to calculate the actual coefficient of performance.
Conclusion:
Refer Table A-12, “Saturated refrigerant-134a: Pressure table”, obtain the properties of refrigerant R-134a at initial pressure
Refer Table A-13, “Superheated refrigerant-134a”, obtain the properties of refrigerant R-134a at exit pressure
Substitute
Substitute
Substitute
Substitute
Thus, the actual coefficient of performance of the refrigerator is
(b)
The maximum coefficient of performance of a reversible refrigerator.
(b)

Answer to Problem 108P
The maximum coefficient of performance of a reversible refrigerator is
Explanation of Solution
Write the formula to calculate the maximum coefficient of performance of a reversible refrigerator.
Here, absolute temperature of high and low temperature reservoir is
Conclusion:
Convert the unit of temperature
Convert the unit of temperature
Substitute 296 K for
Thus, the maximum coefficient of performance of a reversible refrigerator is
(c)
The minimum volume flow rate at the compressor inlet.
(c)

Answer to Problem 108P
The minimum volume flow rate at the compressor inlet is
Explanation of Solution
Write the formula to calculate the minimum power input to the condenser for the same refrigeration load
Write the formula to calculate the minimum mass flow rate
Write the formula to calculate the minimum volume flow rate at the compressor inlet.
Conclusion:
Substitute 26.91 for
Substitute
Substitute
Thus, the minimum volume flow rate at the compressor inlet is
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Chapter 6 Solutions
EBK THERMODYNAMICS: AN ENGINEERING APPR
- For a gas whose equation of state is P(v-b)=RT, the specified heat difference Cp-Cv is equal to which of the following (show all work): (a) R (b) R-b (c) R+b (d) 0 (e) R(1+v/b)arrow_forwardof state is Derive an expression for the specific heat difference of a substance whose equation RT P = v-b a v(v + b)TZ where a and b are empirical constants.arrow_forwardTemperature may alternatively be defined as T = ди v Prove that this definition reduces the net entropy change of two constant-volume systems filled with simple compressible substances to zero as the two systems approach thermal equilibrium.arrow_forward
- Using the Maxwell relations, determine a relation for equation of state is (P-a/v²) (v−b) = RT. Os for a gas whose av Tarrow_forward(◉ Homework#8arrow_forwardHomework#8arrow_forwardBox A has a mass of 15 kilograms and is attached to the 20 kilogram Box B using the cord and pulley system shown. The coefficient of kinetic friction between the boxes and surface is 0.2 and the moment of inertia of the pulley is 0.5 kg * m^ 2. After 2 seconds, how far do the boxes move? A бро Barrow_forwardBox A has a mass of 15 kilograms and is attached to the 20 kilogram Box B using the cord and pulley system shown. The coefficient of kinetic friction between the boxes and surface is 0.2 and the moment of inertia of the pulley is 0.5 kg * m^2. Both boxes are 0.25 m long and 0.25 m high. The cord is attached to the bottom of Box A and the middle of box B. After 2 seconds, how far do the boxes move? A From бро Barrow_forwardHomework#8arrow_forwardSign in PDF Lecture W09.pdf PDF MMB241 - Tutorial L9.pdf File C:/Users/KHULEKANI/Desktop/mmb241/MMB241%20-%20Tutorial%20L9.pdf II! Draw | I│Alla | Ask Copilot + of 4 D Topic: Kinetics of Particles: - Forces in dynamic system, Free body diagram, newton's laws of motion, and equations of motion. TQ1. The 10-kg block is subjected to the forces shown. In each case, determine its velocity when t=2s if v 0 when t=0 500 N F = (201) N 300 N (b) TQ2. The 10-kg block is subjected to the forces shown. In each case, determine its velocity at s-8 m if v = 3 m/s at s=0. Motion occurs to the right. 40 N F = (2.5 s) N 200 N 30 N (b) TQ3. Determine the initial acceleration of the 10-kg smooth collar. The spring has an unstretched length of 1 m. 1 σ Q ☆ Q 6 ا الى ☑arrow_forwardSign in PDF Lecture W09.pdf PDF MMB241 - Tutorial L9.pdf File C:/Users/KHULEKANI/Desktop/mmb241/MMB241%20-%20Tutorial%20L9.pdf II! Draw | I│Alla | Ask Copilot + 4 of 4 | D TQ9. If motor M exerts a force of F (10t 2 + 100) N determine the velocity of the 25-kg crate when t kinetic friction between the crate and the plane are μs The crate is initially at rest. on the cable, where t is in seconds, 4s. The coefficients of static and 0.3 and μk = 0.25, respectively. M 3 TQ10. The spring has a stiffness k = 200 N/m and is unstretched when the 25-kg block is at A. Determine the acceleration of the block when s = 0.4 m. The contact surface between the block and the plane is smooth. 0.3 m F= 100 N F= 100 N k = 200 N/m σ Q Q ☆ ا الى 6 ☑arrow_forwardmy ID# is 016948724 please solve this problem step by steparrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_iosRecommended textbooks for you
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