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Get Full Access to Thermodynamics: An Engineering Approach - 8 Edition - Chapter 11 - Problem 58p
Get Full Access to Thermodynamics: An Engineering Approach - 8 Edition - Chapter 11 - Problem 58p

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# Consider a two-stage cascade refrigeration system

ISBN: 9780073398174 56

## Solution for problem 58P Chapter 11

Thermodynamics: An Engineering Approach | 8th Edition

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Problem 58P

Problem 58P

Consider a two-stage cascade refrigeration system operating between the pressure limits of 1.4 MPa and 160 kPa with refrigerant-134a as the working fluid. Heat rejection from the lower cycle to the upper cycle takes place in an adiabatic counterflow heat exchanger where the pressure in the upper and lower cycles are 0.4 and 0.5 MPa, respectively. In both cycles, the refrigerant is a saturated liquid at the condenser exit and a saturated vapor at the compressor inlet, and the isentropic efficiency of the compressor is 80 percent. If the mass flow rate of the refrigerant through the lower cycle is 0.11 kg/s, determine (a) the mass flow rate of the refrigerant through the upper cycle, (b) the rate of heat removal from the refrigerated space, and (c) the COP of this refrigerator.

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Spencer Kociba CHEM 101 Lecture 11/15/16 THERMOCHEMISTRY ● Enthalpy ○ Represented as ΔH ○ Internal energy + pressure*volume ■ We will mostly be concerned with constant pressure. This is where the formula ΔH = ΔE + PΔV comes from ○ ΔH = q (enthalpy=heat gained or lost in the system) ● Properties of Enthalpy (ΔH ) ○ ΔH is directly proportional to mass ○ ΔH for a reverse reaction is equal in magnitude (quantity) but opposite in sign for the forwards reaction ○ Hess’s Law: ΔH is independent of the number of steps involved ■ If Reaction(1) + Reaction(2)=Reaction(3), then ΔH =3ΔH + 1H 2 ● Endothermic reactions ○ Gains heat from sur

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##### ISBN: 9780073398174

Thermodynamics: An Engineering Approach was written by and is associated to the ISBN: 9780073398174. This textbook survival guide was created for the textbook: Thermodynamics: An Engineering Approach , edition: 8. The full step-by-step solution to problem: 58P from chapter: 11 was answered by , our top Engineering and Tech solution expert on 08/01/17, 09:10AM. The answer to “Consider a two-stage cascade refrigeration system operating between the pressure limits of 1.4 MPa and 160 kPa with refrigerant-134a as the working fluid. Heat rejection from the lower cycle to the upper cycle takes place in an adiabatic counterflow heat exchanger where the pressure in the upper and lower cycles are 0.4 and 0.5 MPa, respectively. In both cycles, the refrigerant is a saturated liquid at the condenser exit and a saturated vapor at the compressor inlet, and the isentropic efficiency of the compressor is 80 percent. If the mass flow rate of the refrigerant through the lower cycle is 0.11 kg/s, determine (a) the mass flow rate of the refrigerant through the upper cycle, (b) the rate of heat removal from the refrigerated space, and (c) the COP of this refrigerator.” is broken down into a number of easy to follow steps, and 132 words. This full solution covers the following key subjects: cycle, refrigerant, Lower, heat, Upper. This expansive textbook survival guide covers 17 chapters, and 2295 solutions. Since the solution to 58P from 11 chapter was answered, more than 630 students have viewed the full step-by-step answer.

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