A vapor-compression refrigeration system, using ammonia (R-717) as the refrigerant, is operating with an evaporator temperature of - 5°C and condenser temperature of 40°C. It is desired to determine the influence of raising the evaporator temperature to 5°C while holding condenser temperature at 40°C. Calculate the percent changes in a. Refrigeration effect per kg refrigerant flow ate b. С.О.Р. c. Heat of compression d. Theoretical power requirements e. Rate of heat rejected at the condenser, anticipated due to raising the evaporator temperature

A vapor-compression refrigeration system, using ammonia (R-717) as the refrigerant, is operating with an evaporator temperature of - 5°C and condenser temperature of 40°C. It is desired to determine the influence of raising the evaporator temperature to 5°C while holding condenser temperature at 40°C. Calculate the percent changes in a. Refrigeration effect per kg refrigerant flow ate b. С.О.Р. c. Heat of compression d. Theoretical power requirements e. Rate of heat rejected at the condenser, anticipated due to raising the evaporator temperature

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter22: Condensers

Section: Chapter Questions

Problem 7RQ: When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be...

See similar textbooks

Related questions

Q: An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid…

Q: A refrigerator uses refrigerant Ammonia as the working fluids and operates between evaporating and…

A: Consider the diagram shown below for the ideal VCRS cycle.

Q: A refrigeration system operates on an ideal vapor compression using R-12 with an evaporator…

Q: Calculate the COP of an R-134a driven fully reversible refrigerator for an evaporator temperature of…

A: Coefficient of performance is ratio of desired effect to the work input. Cop = ( desired effect…

Q: A refrigerant 12 refrigeration system requires a load of 50 kW at an evaporator pressure of 270 kPa…

Q: An ammonia refrigeration compressor takes its suction from the evaporator at a temperature of -20oF…

Q: In a cooling machine that uses R-134a as a refrigerant and operates according to the ideal vapor…

Q: A 5 ton refrigeration system operates on a vapor-compression refrigeration cycle with…

A: Given that: Cooling capacity = 5 ton Working fluid = R134 Pressure at the inlet of compressor = 360…

Q: A two stage cascade refrigeration system uses R-11 as the working substance. The evaporator is at…

A: Given dataTwo stage cascade refrigeration system with R-11 as working substanceEvaporator…

Q: Background: A chiller with a refrigerant flow rate of 50 lb/min (0.378 kg/s) of R-134a has a suction…

A: Refrigerant=R134aMass flow rate of refrigerant, m˙=50 lb/minSuction pressure, Ps=40 PSIADischarge…

Q: An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid…

Q: 8. Consider a two stage compressor refrigeration system operating between the pressure limit of 0.8…

A: Given data as per question

Q: A two-stage compression refrigeration system operates with refrigerant-134a between the pressure…

A: Show the T-s diagram for compression refrigeration cycle as in Figure (1).

Q: An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid…

Q: Consider a steady-flow Carnot refrigeration cycle that uses refrigerant-134a as the working fluid.…

A: Draw the T-s diagram of the cycle.

Q: A gas refrigeration cycle with a pressure ratio of 3 uses helium as the working fluid. The…

Q: 1. A cascade refrigeration * system using R-22 in the low - temperature circuit and ammonia (R-717)…

Q: HFC-134a is the working fluid of a steady-flow Carnot refrigerator. The refrigerant enters the…

A: Dear student, According to the guidelines I am allowed to answer only one…

Q: A R-12 simple saturated refrigerating cycle operates at an evaporating temperature of -10 C and a…

Q: A food storage locker requires a refrigeration system of 2,400 kJ/min capacity at an evaporator…

Q: Refrigerant-134a enters the condenser of a steadyflow Carnot refrigerator as a saturated vapor at 90…

A: Draw the T-s diagram of the Carnot cycle.

Q: The ice industry to produce its raw material considers an ideal vapor compression refrigeration…

A: Given: P1=P4=140 kPaP2=P3=1200 kPam˙w=245 kg/s∆T=11.7 °Chif=324 kJ/kg

Q: 10.) R-134a is the working fluid in the two stage vapor compression refrigeration system using a…

Q: A two-stage compression refrigeration system with an adiabatic liquid- vapor separation unit uses…

Q: A ordinary vapor-compression refrigeration using R-134A operates with a condenser tem- perature of…

A: The vapor compression refrigeration cycle consists of four processes: Isentropic compression,…

Q: a) A freezer working on an ideal vapour-compression refrigeration cycle uses refrigerant R- 134a…

A: as per guideline i have to solve only first question of yours

Q: A Single Stage Vapor Compression (SSVC) refrigeration system has a cooling capacity of 7.5 tons. The…

A: Fume pressure refrigeration frameworks (VCRS) are the most generally involved sort of refrigeration…

Q: A vapor compression cycle with R-134a is being used as its refrigerant. The refrigerant leaves the…

Q: A two-stage compression refrigeration system with an adiabatic liquid- vapor separation unit uses…

Q: Consider a two-stage compression refrigeration system operating between the pressure limits of 0.8…

A: Consider the T-s diagram shown below for the given refrigeration cycle.

Q: HFC-134a is the working fluid of a steady-flow Carnot refrigerator. The refrigerant enters the…

Q: A 10-kW cooling load (i.e., ?̇ L) is to be served by operating an ideal vapor-compression…

Q: A commercial refrigerator using R-134a as a refrigerant is used to keep the cooled environment at…

Q: A simple vapour compression refrigeration system using R-134a as a refrigerant operates between an…

Q: A simple saturated refrigeration cycle for R-12 system operates at an evaporating temperature of…

A: Given that: The working fluid is R12. For the refrigeration cycle, evaporator temperature = -5 oC.…

Q: An ammonia refrigeration compressor takes its suction from the evaporator at a temperature of -20oF…

Q: The refrigeration system of a large commercial complex operates in a multi-pressure system in which…

Q: kg/s and the low-temperature evaporator serves a cooling load of 10 kW. The refrigerant is saturated…

A: Given Data The pressure of the condensor is:P3=800 kPa The temperature of the evaporator 1…

Q: 2. A cascade refrigeration system using R - 22 in the low - temperature circuit and ammonia (R-717)…

Q: A two stage cascade refrigeration system uses R-12 in the high pressure loop with a condenser…

A: Solution: Given Data: h6 = 366 kJ/kg; h2= 421 kJ/kg Note: Dear Student! Since you have asked…

Q: Consider a refrigrator that operates on the vapor compression refrigeration cycle with R-134a as the…

A: Given Data:- Inlet Pressure of compressor, P1=70 kPa Outlet Pressure of compressor, P2=1200 kPa

Q: A two-stage compression refrigeration system operates with refrigerant-134a between the pressure…

A: Show the T-s diagram for compression refrigeration cycle as in Figure (1).

Q: A two stage cascade refrigeration system uses R-12 in the high pressure loop with a condenser…

A: Solution: Given Data: T = 28 tons

Q: An ammonia refrigeration compressor takes its suction from the evaporator at a temperature of -20oF…

Q: Condenser a steam power plant that operates on a simple ideal ranking cycle and has a net power…

A: Wnet=22 MW PH=7Mpa or PH=70 bar and TH=T3=450.05°CPL=10kPa or PL=.1 bar ,Cp=2.9593 kJkgK Now…

Q: An ammonia refrigeration compressor takes its suction from the evaporator at a temperature of -20oF…

A: Answer: The horsepower per ton of refrigeration is 0.897 HP.

Q: An ammonia refrigeration compressor takes its suction from the evaporator at a temperature of -20oF…

A: Given Enthalpy, h,2 = 1,568 kJ/kg At 10oC: hf,3 = 246.531 kJ/kg At -28.9oC by…

Question

A vapor-compression refrigeration system, using ammonia
(R-717) as the refrigerant, is operating with an evaporator
temperature of -5°C and condenser temperature of 40°C.
It is desired to determine the influence of raising the
*6.5
evaporator temperature to 5°C while holding condenser
temperature at 40°C. Calculate the percent changes in
a. Refrigeration effect per kg refrigerant flow iate
b. С.О.P.
c. Heat of compression
d. Theoretical power requirements
e. Rate of heat rejected at the condenser, anticipated due to
raising the evaporator temperature

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

Step 2

Step 3

Step 4

Step 5

Step 6

Step 7

Step 8

Step 9

Trending now

This is a popular solution!

Step by step

Solved in 9 steps with 9 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be higher in temperature than the entering air temperature.
Condensers in these refrigerators are all_______cooled.
Refrigerators currently being manufactured in the United States are using______as their refrigerant.
What are the approximate temperature ranges tor low-, medium-, and high-temperature refrigeration applications?
Welded ______sealed compressors are normally used in household refrigerators.
Define flash gas, and explain how it applies to the net refrigeration effect of the refrigeration cycle.
A two stage cascade refrigeration system uses R-12 in the high pressure loop with a condenser temperature of 300C and -100C in the cascade condenser, and R-22 in the low pressure loop with a temperature in the cascade condenser of 00C and an evaporator temperature of -30 0C. The refrigeration load is 24 tons. Given : h6 = 368 kJ/kg; h2= 420 kJ/kg Determine: 1) the mass flow rate in the low pressure loop in kg/s 2) mass flow rate in the high pressure loop, in kg/s 3) total power requirement in KW
A two stage cascade refrigeration system uses R-12 in the high pressure loop with a condenser temperature of 300C and -100C in the cascade condenser, and R-22 in the low pressure loop with a temperature in the cascade condenser of 00C and an evaporator temperature of -30 0C. The refrigeration load is 28 tons. Given : h6 = 366 kJ/kg; h2= 421 kJ/kg Determine: 1) the mass flow rate in the low pressure loop in kg/s 2) mass flow rate in the high pressure loop, in kg/s 3) total power requirement in KW 4.) COP 5.) heat rejected in the condenser, KW 6.) amount of cooling water needed for a temp rise of 140C. in kg/s 7.) amount of ice (kg)for a 10 hrs operation if the initial temp of water is 31 0C to ice at -80C. Answe in kg.
A two-evaporator, multiple EV,and multiple compression refrigeration system uses refrigerant-134a as the working fluid. The system operates evaporator 1 at 0°C, evaporator 2 at -26.4°C, and the condenser at 800kPa. The refrigerant is circulated through the compressor at a rate of 0.1kg/s and the low temperature evaporator serves a cooling load of 8 kW.Determine the cooling rate of the high-temperature evaporator, the power required by the compressor, and the COP of the system. The refrigerant is saturated liquid at the exit of the condenser and saturated vapor at the exit of each evaporator, and the compressor is isentropic.
A two stage cascade refrigeration system uses R-12 in the high pressure loop with a condenser temperature of 300C and -100C in the cascade condenser, and R-22 in the low pressure loop with a temperature in the cascade condenser of 00C and an evaporator temperature of -30 0C. Given that, h6 = 366 kJ/kg; h2= 421 kJ/kg. Determine the amount of ice (kg)for a 10 hrs operation if the initial temp of water is 31 0C to ice at --80C. ANSWER: 7358.9169 kg A two stage cascade refrigeration system uses R-11 as the working substance. The evaporator is at -30 0C and the high pressure condenser is at 300C. The cascade condenser is a direct contact type. The refrigeration load is 24 tons. Given that, h2 = 393 kJ/kg; h6 = 408 kJ/kg. Determine the ff: a.) amount ofwater for a 10 hrs operation if the initial temp of water is 34 0C to 20C. ANSWER: 22656.8019kg b.) amount of cooling water needed for a temp rise of 130C. ANSWER: 1.9446 c.) heat…
Consider a steady-flow Carnot refrigeration cycle that uses refrigerant-134a as the working fluid. The maximum and minimum temperatures in the cycle are 30 and -20C, respectively. The quality of the refrigerant is 0.15 at the beginning of the heat absorption process and 0.80 at the end. Show the cycle on a T-s diagram relative to saturation lines, and determine (a) the coefficient of performance, (b) the condenser and evaporator pressures, and (c) the net work input.
Q1 Consider a two-stage compression refrigeration system operating between the pressure limits of 0.8and0.14 MPa(see Fig. Q 2). The working fluid isrefrigerant -134a. The refrigerant leaves thecondenser as a saturated liquid and is throttled to aflash chamberoperating at0.4 MPa. Part ofthe refrigerant evaporates during this flashing process, and this vapour is mixed with the refrigerantleaving the low-pressure compressor. The mixture is then compressed to the condenser pressure bythe high-pressure compressor. The liquid in the flash chamber is throttled to the evaporator pressure,and it cools the refrigerated space as it vaporizes in the evaporator. Assuming the refrigerant leavesthe evaporator as saturated vapor and both compressors are isentropic, determine(a) the fraction of the refrigerant that evaporates as it is throttled to the flash chamber,(b) the amount of heat removed from the refrigerated space and the compressor work per unit massof refrigerant flowing through the…