3.64 A two-stage cascade refrigeration system is shown below. The refrigerant is R134a. It consists of two ideal vapor-compression cycles with heat exchange between the condenser of the lower- temperature cycle and the evaporator of the higher-temperature cycle. The hotter cycle operates between 0.7 MPa and 0.35 MPa, while the cooler cycle operates between 0.35 MPa and 0.12 MPa. If the flow rate in the hotter cycle is 0.5 mol/s, determine the following:
3.64 A two-stage cascade refrigeration system is shown below. The refrigerant is R134a. It consists of two ideal vapor-compression cycles with heat exchange between the condenser of the lower- temperature cycle and the evaporator of the higher-temperature cycle. The hotter cycle operates between 0.7 MPa and 0.35 MPa, while the cooler cycle operates between 0.35 MPa and 0.12 MPa. If the flow rate in the hotter cycle is 0.5 mol/s, determine the following:
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:3.64 A two-stage cascade refrigeration system is shown below. The refrigerant is R134a. It consists
of two ideal vapor-compression cycles with heat exchange between the condenser of the lower-
temperature cycle and the evaporator of the higher-temperature cycle. The hotter cycle operates
between 0.7 MPa and 0.35 MPa, while the cooler cycle operates between 0.35 MPa and 0.12 MPa. If
the flow rate in the hotter cycle is 0.5 mol/s, determine the following:
Valve
Valve
5
1
P= 0.12 MPa
8
P= 0.35 MPa
4-
P= 0.7 MPa
Refrigeration
unit at
low T
ac Evaporator
Condenser| Q
High T
reservoir
Evaporator
-6
Condenser
7
Compressor 2
Compressor 1
(a) What is the flow rate in the cooler cycle?
(b) What is the rate of heat removal from the refrigerated unit?
(c) What is the power input needed to the compressors?
(d) What is the COP?
2.
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