The compressor of a refrigerator using refrigerant R134a draws 1.2 kW. Sincethe evaporation temperature in the evaporator is -22 °C and the condensationtemperature in the condenser is 38 °C; (a) Plot this refrigerator systemschematically with its elements and show it on the T-s and P-h diagram of therefrigeration cycle (b) The cooling power of the refrigerator (c) The amount ofheat the refrigerator gives to the environment (d) Calculate the ideal andCarnot COP cooling values of this refrigerator.

Answered: Image /qna-images/answer/60da181b-e04f-4317-91d4-e01a33e3e8a0.jpg

e evaporation temperature in the evaporator is -22 °C and the condens: nperature in the condenser is 38 °C: (a) Plot this refrigerator system ematically with its elements and show it on the T-s and P-h diagram o rigeration cycle (b) The cooling power of the refrigerator (c) The amour at the refrigerator gives to the environment (d) Calculate the ideal and rnot COP cooling values of this refrigerator.

e evaporation temperature in the evaporator is -22 °C and the condens: nperature in the condenser is 38 °C: (a) Plot this refrigerator system ematically with its elements and show it on the T-s and P-h diagram o rigeration cycle (b) The cooling power of the refrigerator (c) The amour at the refrigerator gives to the environment (d) Calculate the ideal and rnot COP cooling values of this refrigerator.

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

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 12RQ: Refrigerators currently being manufactured in the United States are using______as their refrigerant.

See similar textbooks

Similar questions

Condensers in these refrigerators are all_______cooled.
In refrigeration process, a region is cooled and the temperature was maintained at -15oC. The cooling water used in the refrigeration is 25oC. If the refrigerant is HFC-134a, and the heat transfer temperature difference is 10oC, (a) calculate the COP of the Carnot Refrigerator. (b) What is the COP and (c) mass flowrate if the rating of the refrigeration process is 100,000 kJ/h and the efficiency of the compression is 0.75
A vapor-compression refrigerator operates as in the right figure using CO₂ as refrigerant. The evaporation is at -10 °C and the condensation is at 20 °C. The efficiency of the compressor is 0.7, and the refrigeration capacity is 1500 kJ/s. Using the P-H diagram below, (a) Estimate the power requirement, the heat transfer rate in the condenser, and the circulation rate of CO₂. (b) Estimate the coefficient of performance. (c) Sketch the cycle in the P-H diagram (as accurate as possible). Pressure Entropy [kJ/kg.K] 1.0 20 MPa 18 MPa 15 MPa 13 MPa 10 MPa 9 MPa 8 MPa 7 MPa 6 MPa 5 MPa 4 MPa 3.5 MPa 3 MPa 2.5 MPa 2 MPa 150 -10°C 0°C 200 P-h diagram for Carbon Dioxide Refrigerant [R744] 1.2 1.3 1.7 1.1 1.4 1.5 1.6 100 °C 80 °C 90 °C 10 °C 20 °C 30 °C 40 °C 50 °C 60 °C 70°C 250 volume [m³/kg]. 10% 20% 30% 40% 50% 60% 70% 80% 0.002: 300 0.003 350 Enthalpy (kJ/kg) 0.004 90% 400 0.006 450 1.8 120 °C Throttle valve 4 -0.008 0.01 Condenser 500 2.0 1.9 140 C 160 C 180 C Compressor Evaporator 550 2…
In a meat processing plant, it is required to cool 1500 kg of beef whose specific heataverage is 3.14 kJ/kg-°C to lower its temperature from 39 °C to 2 °C in 14 hours. It is required to estimate theenergy requirements necessary for meat cooling capacity, assuming that the cooling systemRefrigeration operates on an ideal vapor compression refrigeration cycle. A refrigeration unit is chosenwith refrigerant 134a with a condenser pressure of 1.4 MPa and an evaporator pressure of 240 kPa.Assume that the refrigerant enters the compressor as a saturated vapor and leaves the condenser as a saturated liquid.Calculate:a) The COPR or CDFR,b) The mass flow of the refrigerantc) The energy dissipated into the atmosphered) The cost of annual electrical energy, if the plant will operate with a load factor (FC) of 85% (100%-FC =8760 h/year). Consider the unit cost of electrical energy of $2.6 per kWh and the efficiency of the system90% motor-compressor.
A manufacturing company is intending to use its water cooled condenser for itsproposed cold storage room. The name plate of the condenser gives the followingspecifications:refrigerant ammoniacondenser water inlet 30 OCcondenser water outlet 40 OCcondensing temperature 35 OCrefrigerant flow 3.84 kg/mincirculating water flow 120 kg/minIf the company decided to purchase a new compressor and evaporator, find the tonnageof the system and the temperature in the evaporator, (b) what is the COP? (c) find thetheoretical hp required.
A manufacturer conducted an experiment for an evaporator capacity 507 kW cooling and designed for high COP of 1.8 when using lithium bromide plus water in an absorption refrigeration system. The evaporator operates 20 C, condenser 40 C & absorber 45 C supplying 1.4 kg/s of water plus lithium bromide solution to the generator. For a condenser size of 694 kW, determine: Heat provided by the generator & absorber capacity in kW
The large insulated flash chamber of a vacuum refrigeration plant is kept at low temperatureby a steam jet which pumps vapor to a condenser . The condensate pump removes thecondensate formed and an air ejector discharges air from the condenser to an air vent .Warm water returns enters the flash chamber at 13 deg C ; chilled water leaves the flashchamber at 4 deg C . The vapor leaving the flash chamber has a dryness factor of 97% andthe condenser inside temperature is 32 deg C . For 100 tons of refrigeration , determine thequantity in cubic meter per minute of chilled water at 4 deg C that the system can provide .A) 0.45 B) 0.56 C) 9.33 D) 0.75
In a household refrigerator, the condenser is vertically mounted at the outer backof the unit, the freezer (evaporator) on the topmost compartment, and thevegetable compartment at the very bottom. Explain why?
A manufacturer conducted an experiment for an evaporator capacity 500 kW cooling and designed for high COP of 2 when using lithium bromide plus water in an absorption refrigeration system. The evaporator operates 20 C, condenser 40 C & absorber 45 C supplying 1.4 kg/s of water plus lithium bromide solution to the generator. For a condenser size of 650 kW, determine:Ethalphy of the refrigerant entering the Evaporator in kJ/kg Answer in two decimal places
An ammonia simple vapor operates between evaporator and condenser temperature of -20°C and 35°C respectively. The system used producing 5000kg of ice in 20hrs. A 100x200mm compressor with a compression efficiency of 80% and electric input to the motor driving the compressor is 14kW. Motor efficiency is 90%. Determine: (a) Qe (b) Work indicated (c) Brake work (d) Mechanical efficiency
A plant using R134a refrigerant has a cooling capacity of 352 kW of refrigeration. It evaporates at 0 Cand condenses at 35 C, with the 5 of superheat at the evaporator outlet and 5 K of sub-cooling at the condenser outlet. Assuming isentropic compression and ignoring pressure drops in the piping, the evaporator and condenser, determi the following; a) The refrigeration effect b) The mass flow rate of refrigerant ) The compressor power d) The rate of heatrejection at the condenser e) The COP 0 The corresponding Carnot COP g) The percentage Carnot-efficiency
A manufacturer conducted an experiment for an evaporator capacity 500 kW cooling and designed for high COP of 2 when using lithium bromide plus water in an absorption refrigeration system. The evaporator operates 20 C, condenser 40 C & absorber 45 C supplying 1.4 kg/s of water plus lithium bromide solution to the generator. For a condenser size of 650 kW, determine:Ethalphy of the refrigerant leaving the Evaporator in kJ/kgAnswer in one decimal place(s)