Thermodynamics: An Engineering Approach
9th Edition
ISBN: 9781259822674
Author: Yunus A. Cengel Dr., Michael A. Boles
Publisher: McGraw-Hill Education
expand_more
expand_more
format_list_bulleted
Textbook Question
Chapter 11.10, Problem 124RP
An aircraft on the ground is to be cooled by a gas refrigeration cycle operating with air on an open cycle. Air enters the compressor at 30°C and 100 kPa and is compressed to 250 kPa. Air is cooled to 85°C before it enters the turbine. Assuming both the turbine and the compressor to be isentropic, determine the temperature of the air leaving the turbine and entering the cabin.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
P
Refrigerant-134a enters the compressor of a
refrigerator at 140 kPa and -10°C at a rate of 0.3
m3/min and leaves at 1 MPa. The isentropic
efficiency of the compressor is 78 percent. The
refrigerant enters the throttling valve at 0.95 MPa
and 30°C and leaves the evaporator as saturated
vapour at -18.5°C. determine the coefficient of
performance.
Refrigerant-134a enters the compressor of a refrigerator at 140kPa and - 10 degrees celsius at a rate of 0.3
m^3/min and leaves at 1 MPa. The isentropic efficiency of the compressor is 78%. The refrigerant enters the
throttling valve at 0.95 MPa and 30 degrees celsius and leaves the evaporator as saturated vapour at -18.5
degrees celsius. DETERMINE the coefficient of performance..
Chapter 11 Solutions
Thermodynamics: An Engineering Approach
Ch. 11.10 - Why do we study the reversed Carnot cycle even...Ch. 11.10 - Why is the reversed Carnot cycle executed within...Ch. 11.10 - A steady-flow Carnot refrigeration cycle uses...Ch. 11.10 - Refrigerant-134a enters the condenser of a...Ch. 11.10 - Does the ideal vapor-compression refrigeration...Ch. 11.10 - Why is the throttling valve not replaced by an...Ch. 11.10 - In a refrigeration system, would you recommend...Ch. 11.10 - Does the area enclosed by the cycle on a T-s...Ch. 11.10 - Consider two vapor-compression refrigeration...Ch. 11.10 - It is proposed to use water instead of...
Ch. 11.10 - The COP of vapor-compression refrigeration cycles...Ch. 11.10 - A 10-kW cooling load is to be served by operating...Ch. 11.10 - An ice-making machine operates on the ideal...Ch. 11.10 - An air conditioner using refrigerant-134a as the...Ch. 11.10 - An ideal vapor-compression refrigeration cycle...Ch. 11.10 - A refrigerator operates on the ideal...Ch. 11.10 - A refrigerator uses refrigerant-134a as the...Ch. 11.10 - An ideal vapor-compression refrigeration cycle...Ch. 11.10 - A refrigerator uses refrigerant-134a as its...Ch. 11.10 - A refrigerator uses refrigerant-134a as the...Ch. 11.10 - A commercial refrigerator with refrigerant-134a as...Ch. 11.10 - The manufacturer of an air conditioner claims a...Ch. 11.10 - Prob. 24PCh. 11.10 - How is the second-law efficiency of a refrigerator...Ch. 11.10 - Prob. 26PCh. 11.10 - Prob. 27PCh. 11.10 - Prob. 28PCh. 11.10 - Bananas are to be cooled from 28C to 12C at a rate...Ch. 11.10 - A vapor-compression refrigeration system absorbs...Ch. 11.10 - A room is kept at 5C by a vapor-compression...Ch. 11.10 - Prob. 32PCh. 11.10 - A refrigerator operating on the vapor-compression...Ch. 11.10 - When selecting a refrigerant for a certain...Ch. 11.10 - A refrigerant-134a refrigerator is to maintain the...Ch. 11.10 - Consider a refrigeration system using...Ch. 11.10 - A refrigerator that operates on the ideal...Ch. 11.10 - A heat pump that operates on the ideal...Ch. 11.10 - Do you think a heat pump system will be more...Ch. 11.10 - What is a water-source heat pump? How does the COP...Ch. 11.10 - A heat pump operates on the ideal...Ch. 11.10 - Refrigerant-134a enters the condenser of a...Ch. 11.10 - A heat pump that operates on the ideal...Ch. 11.10 - The liquid leaving the condenser of a 100,000...Ch. 11.10 - Reconsider Prob. 1144E. What is the effect on the...Ch. 11.10 - A heat pump using refrigerant-134a heats a house...Ch. 11.10 - A heat pump using refrigerant-134a as a...Ch. 11.10 - Reconsider Prob. 1148. What is the effect on the...Ch. 11.10 - Prob. 50PCh. 11.10 - How does the COP of a cascade refrigeration system...Ch. 11.10 - Consider a two-stage cascade refrigeration cycle...Ch. 11.10 - Can a vapor-compression refrigeration system with...Ch. 11.10 - Prob. 54PCh. 11.10 - A certain application requires maintaining the...Ch. 11.10 - Prob. 56PCh. 11.10 - Repeat Prob. 1156 for a flash chamber pressure of...Ch. 11.10 - Prob. 59PCh. 11.10 - A two-stage compression refrigeration system with...Ch. 11.10 - A two-stage compression refrigeration system with...Ch. 11.10 - A two-evaporator compression refrigeration system...Ch. 11.10 - A two-evaporator compression refrigeration system...Ch. 11.10 - Repeat Prob. 1163E if the 30 psia evaporator is to...Ch. 11.10 - Consider a two-stage cascade refrigeration cycle...Ch. 11.10 - How does the ideal gas refrigeration cycle differ...Ch. 11.10 - Prob. 67PCh. 11.10 - Devise a refrigeration cycle that works on the...Ch. 11.10 - How is the ideal gas refrigeration cycle modified...Ch. 11.10 - Prob. 70PCh. 11.10 - How do we achieve very low temperatures with gas...Ch. 11.10 - An ideal gas refrigeration system operates with...Ch. 11.10 - Air enters the compressor of an ideal gas...Ch. 11.10 - Repeat Prob. 1173 for a compressor isentropic...Ch. 11.10 - An ideal gas refrigeration cycle uses air as the...Ch. 11.10 - Rework Prob. 1176E when the compressor isentropic...Ch. 11.10 - A gas refrigeration cycle with a pressure ratio of...Ch. 11.10 - A gas refrigeration system using air as the...Ch. 11.10 - An ideal gas refrigeration system with two stages...Ch. 11.10 - Prob. 81PCh. 11.10 - Prob. 82PCh. 11.10 - What are the advantages and disadvantages of...Ch. 11.10 - Prob. 84PCh. 11.10 - Prob. 85PCh. 11.10 - Prob. 86PCh. 11.10 - Prob. 87PCh. 11.10 - Heat is supplied to an absorption refrigeration...Ch. 11.10 - An absorption refrigeration system that receives...Ch. 11.10 - An absorption refrigeration system receives heat...Ch. 11.10 - Heat is supplied to an absorption refrigeration...Ch. 11.10 - Prob. 92PCh. 11.10 - Prob. 93PCh. 11.10 - Consider a circular copper wire formed by...Ch. 11.10 - An iron wire and a constantan wire are formed into...Ch. 11.10 - Prob. 96PCh. 11.10 - Prob. 97PCh. 11.10 - Prob. 98PCh. 11.10 - Prob. 99PCh. 11.10 - Prob. 100PCh. 11.10 - Prob. 101PCh. 11.10 - Prob. 102PCh. 11.10 - A thermoelectric cooler has a COP of 0.18, and the...Ch. 11.10 - Prob. 104PCh. 11.10 - Prob. 105PCh. 11.10 - Prob. 106PCh. 11.10 - Rooms with floor areas of up to 15 m2 are cooled...Ch. 11.10 - Consider a steady-flow Carnot refrigeration cycle...Ch. 11.10 - Consider an ice-producing plant that operates on...Ch. 11.10 - A heat pump that operates on the ideal...Ch. 11.10 - A heat pump operates on the ideal...Ch. 11.10 - A large refrigeration plant is to be maintained at...Ch. 11.10 - Repeat Prob. 11112 assuming the compressor has an...Ch. 11.10 - An air conditioner with refrigerant-134a as the...Ch. 11.10 - A refrigerator using refrigerant-134a as the...Ch. 11.10 - Prob. 117RPCh. 11.10 - An air conditioner operates on the...Ch. 11.10 - Consider a two-stage compression refrigeration...Ch. 11.10 - A two-evaporator compression refrigeration system...Ch. 11.10 - The refrigeration system of Fig. P11122 is another...Ch. 11.10 - Repeat Prob. 11122 if the heat exchanger provides...Ch. 11.10 - An aircraft on the ground is to be cooled by a gas...Ch. 11.10 - Consider a regenerative gas refrigeration cycle...Ch. 11.10 - An ideal gas refrigeration system with three...Ch. 11.10 - Prob. 130RPCh. 11.10 - Derive a relation for the COP of the two-stage...Ch. 11.10 - Prob. 133FEPCh. 11.10 - Prob. 134FEPCh. 11.10 - Prob. 135FEPCh. 11.10 - Prob. 136FEPCh. 11.10 - Prob. 137FEPCh. 11.10 - An ideal vapor-compression refrigeration cycle...Ch. 11.10 - Prob. 139FEPCh. 11.10 - An ideal gas refrigeration cycle using air as the...Ch. 11.10 - Prob. 141FEPCh. 11.10 - Prob. 142FEP
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
- An ammonia vapor refrigeration cycle operates at an evaporator temperature of -16°C and a condensing temperature of 32°C. Determine the coefficient of performance for wet compression with superheated vapor leaving the compressor. The quality of vapor entering the compressor is 0.975 and the specific entropy of the superheated vapor discharging from the compressor is 5.7 kJ/kg-K.arrow_forward15 It is proposed to use a Brayton cycle with an intercooler added to the compressor. Air enters the compressor at 100 kPa and 25 °C and eventually leaves the compressor at a pressure of 1500 kPa. The mass flow rate of the air is 50 kg/s. Consider the specific heats of the air to be constant. The isentropic efficiency of the compressor is 0.80. Determine the temperatures and the power required by the compressor if the compression occur in one step, Determine the temperatures, pressures and the power required by the compressor if the air is compressed to 400 kPa, directed toward an intercooler where it is cooled to 25 °C, and then returned to the compressor then completes the compression t 1500 kPa. Sketch an appropriate T-s diagram and flow diagram of the system in 4.2.arrow_forwardA 300-HP engine with a thermal efficiency of 30% is using a remote radiator which absorbs 25% of the heat supplied to the engine. Cooling system with cooling tower is used with a cooling range of 5°C. The temperature rise of the water after passing the remote radiator is 10°C. Air enters the cooling tower at 32°C dry-bulb; 26°C wet-bulb temperatures and leaves the tower at 36°C & 70%RH. Make a schematic diagram of the system, the process in the provided psychrometric chart and calculate the following: (a.) The water flow rate in the cooling tower in liters per hour; and (b.) If the heat absorbed by air is 20% of heat absorbed by the cooling tower water, what is the air flow needed in cu.m/hour.arrow_forward
- R134a is used as a working fluid in a cooling system with a cooling capacity of 50 kJ/s operating according to the ideal vapor compression refrigeration cycle. The refrigerant enters the compressor as saturated steam at a pressure of 120 kPa and is compressed to a pressure of 650 kPa. The mass flow of R-134a is 0.10 kg/s. If an isentropic turbine is used instead of the throttle valve in the cooling system, what is the efficiency coefficient of the system? A-3,689B-3.215C-4.513D-3.245E-4.123 (Note: This question is Turkish) orginal question: İdeal buhar sıkıştırmalı soğutma çevrimine göre çalışan soğutma kapasitesi 50 kJ/s olan bir soğutma sisteminde iş akışkanı olarak R134a kullanılmaktadır. Soğutucu akışkan kompresöre 120 kPa basınçta doymuş buhar olarak girmekte ve 650 kPa basınca sıkıştırılmaktadır. R-134a’nın kütlesi debisi 0.10 kg/s’dir. Eğer soğutma sistemindeki kısılma vanası yerine izantropik bir türbin kullanılırsa sistemin etkinlik katsayısı ne olur?arrow_forwardA vapor-compression refrigeration system circulates refrigerant 134a at a rate of 0.15 kg/s. The refrigerant enters the compressor at -10 degrees Celcius and 100 kPa, and exits the compressor at 800 kPa. The isentropic efficiency of the compressor is 76%. Pressure drop through the condenser and evaporator are negligible. The refrigerant exits the condenser at 30 degrees Celcius and 800 kPa. Ignoring the heat transfer between the compressor and its surroundings, determine: The rate at which heat energy is removed from the refrigerated space in kW. The coefficient of perfromance.arrow_forwardDefine the h-s diagram of the actual and isentropic processes of an adiabatic compressor.arrow_forward
- An Otto cycle uses air as its working fluid. The compression ratio of the cycle is 10. 1,800 kJ/kg of heat is added during the heat addition process. If the temperature and pressure at the end of compression are 444C and 2,168Kpa. Assume constant specific heats for the analysis, determine (a) the temperature and pressure at the end of each process, (b) the thermal efficiency of the process (c) the net Work of the cycle (d)mean effective pressure of the cycle.arrow_forwardA gas turbine uses two compression and two expansion stages, each stage having a pressure ratio of 4. The working fluid is intercooled between the two compression stages and reheated between the two expansion stages. Air enters the gas turbine at 100kPa and 17°C. The combustion chamber and reheat stage each contribute 300kJ/kg of heat. A regenerator uses exhausted gases to increase the working fluid temperature prior to the combustion chamber by 20°C. Assume constant thermal properties of air evaluated at 300K during your solution. Assume all turbine and compressor stages are isentropic. Draw the T-s diagram based on the numbering convention in the schematic below. Determine the system's thermal efficiency. Determine the required air mass flow rate to obtain an output of 10MW. 26 REMEWS REHEAT JNTER. Ti C2 Come REGEN. Scannad wim Camirwnerarrow_forwardRefrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 MPa and – 10°C at a rate of 0.12 kg/s, and it leaves at 0.7 MPa and 50°C. The refrigerant is cooled in the condenser to 24°C and 0.65 MPa, and it is throttled to 0.15 MPa. Disregarding any heat transfer and pressure drops in the connecting lines between the components, show the cycle on a T-s diagram with respect to saturation lines, and determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor, (b) the isentropic efficiency of the compressor, and (c) the COP of the refrigerator. T 0.70MPA 2s 50°C 0.65MPA 24°C Win 0.15 MPa 0.14MPA -10°Carrow_forward
- The 7FA gas turbine manufactured by General Electric is reported to have an efficiency of 35.9 percent in the simple cycle mode and to produce 159 MW of net power. The pressure ratio is 14.7 and the turbine inlet temperature is 1288°C. The mass flow rate through the turbine is 1,536,000 kg/h. Taking the ambient conditions to be 30°C and 100 kPa, determine the isentropic efficiencies of the turbine and the compressor. Also, determine the thermal efficiency of this gas turbine if a regenerator with an effectiveness of 66 percent is added. Use variable specific heats for air. The isentropic efficiency of the turbine is The isentropic efficiency of the compressor is %. The thermal efficiency of the gas turbine with the regenerator is [ %. %.arrow_forwardAn ideal gas turbine cycle consisting of 2 stages of compression and 2 stages of expansion has an overall pressure ratio of 9. Air enters the compressors at the temperature of 320 K while, being intercooled between the stages. Air enters the first compressor at 100 kPa and the pressure ratio of cach of the compressors are selected in a way that minimizes the total power input for the compressors. The high-pressure turbine (First one) drives the compressors and the low-pressure one produces power output. The compressors and both the high-pressure and low-pressure turbines can be assumed ideal. To increase the efficiency of the cycle a regenerator with effectiveness of 85% is used to recover some heat from the exhaust of the second turbine. In this cycle, air with the temperature of 1400 K enters the first turbine. After expansion in the first turbine, air is reheated to the same temperature at the inlet of the first turbine (1400 K). You can consider constant specific heats of c,=1.005…arrow_forwardHelium gas is compressed from 0.303 MPa and 275 K to 4.04 MPa and 300 K in a Claude refrigerator utilizing a wet expander with a saturated-vapor compressor. Twenty percent of the compressed gas is diverted through the main expander entering at 190 K and leaving at 0.303 MPa. The helium enters the low temperature compressor at 0.101 MPa as saturated vapor and leaves at 0.303 MPa. If the compressors, expanders and heat exchangers for this refrigerator are assumed to be ideal, determine the refrigeration effect, coefficient of performance and figure of merit when no expander work is recovered. The following thermodynamic properties are obtained from the temperature--entropy diagram for helium: hl (0.303 MPa, 275 K) = 1444 kJj/kg s1 (0.303 MPa, 275 K) = 28.7 kJ/kg K H h2 (4.04 MPa, 300 K) = 1586 kJ/kg $2 (4.04 MPa, 300 K) = 23.75 kJ/kg K h3 (4.04 MPa, 190 K) = 1013 kJ/kg $3 (4.04 MPa, 190 K) = 21.4 kJ/kg K h7(0.101 MPa, saturated vapor) = 31 kJjkg $7(0.101 MPa, saturated vapor) = 8.4 kJjkg…arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY
Elements Of Electromagnetics
Mechanical Engineering
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:9780134319650
Author:Russell C. Hibbeler
Publisher:PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:9781259822674
Author:Yunus A. Cengel Dr., Michael A. Boles
Publisher:McGraw-Hill Education
Control Systems Engineering
Mechanical Engineering
ISBN:9781118170519
Author:Norman S. Nise
Publisher:WILEY
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Cengage Learning
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:9781118807330
Author:James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:WILEY
The Refrigeration Cycle Explained - The Four Major Components; Author: HVAC Know It All;https://www.youtube.com/watch?v=zfciSvOZDUY;License: Standard YouTube License, CC-BY