THERMODYNAMICS LLF W/ CONNECT ACCESS
9th Edition
ISBN: 9781264446889
Author: CENGEL
Publisher: MCG
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 11.10, Problem 123RP
Repeat Prob. 11–122 if the heat exchanger provides 9.51°C of subcooling.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Wet-mixture exhaust from a turbine at 7 kPaa at a rate of 75 kg/s enters a condenser with a total surface area of 2950 m2. The mixture has a moisture content of 10% and leaves the condenser as saturated liquid. The cooling water volumetric flow rate is 4.413 m3 /s and enters at 20 oC. Find the LMTD and overall heat transfer coefficient. NOTE: AT 7 kPaa, tsat = 39 oC, hf = 163.4 kJ/kg, hfg = 2572.5 kJ/kg
(four decimal places for final answer)
Steam passes steadliy through a turbine and condenser as shown in the figure below.
After expanding through the turbine and producing 1000kW of power, the steam is at a pressure of 0.08 bar and a quality of
87.4%; it enters a shell-and-tube heat exchanger where the steam now condenses on the outside of tubes through which cooling
water flows; this condensate continues to flow, finally exiting as saturated liquid at 0.08 bar. The mass flow rate of the
condensing steam is 58kg/s, In order to condense the steam, cooling water enters the tubes at 15°C and flows as a separate
stream to exit at 35°C with negligible change in pressure.
Stray heat transfer is negligible as are kinetic and potential effects.
Considering the steam inside the turbine as a system, is the system best described as open, closed or isolated?
What is the mass flow rate of steam entering the turbine in kg/s?
What is the enthalpy at the inlet of the turbine in k/kg?
What is the mass flowrate of the cooling water in kg/s?…
A boiler has a mass flow rate of 3 tons/hour of feed water at a temperature of 28 C and a pressure of 1 atm. This water is pumped to a pressure of 30 atm assuming a constant temperature. Pump efficiency is 90%. The water leaving this pump is heated in an Economizer heat exchanger to its saturation point temperature in the saturated water phase? What is the rate of heat supplied by the Economizer to heat the pump exit feedwater to the above conditions
Chapter 11 Solutions
THERMODYNAMICS LLF W/ CONNECT ACCESS
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
- What type of heat exchanger is a waste heat boiler? Is it a regenerator or a recuperator? Choose only between the two.arrow_forwardSteam is supplied to a turbine at a pressure of 5,000 KPa and a temperature of 500 C. Steam is bled for feed heating at pressures of 2000 KPa and 500 kPa. The condenser pressure is 50 KPa. The stage efficiency of each section of the turbine can be taken as 82%. In the feed heaters the feedwater has its liquid enthalpy raised to that of the corresponding bled steam. The bled steam is condensed but not undercooled and, in this state, on leaving the feed heater. is pumped into the feed main as it leaves the feed heater Using a Mollier chart, determine Note: Use the Mollier Chart to answer the question Complete the calculations using 4 significant figures The mass of steam bled to each feed heater in kg/kg of supply steam 0.017 O kg/kg supply steam m2 = 0,0106 O kg/kg supply steamarrow_forwardDerive the equations as given below as applied to COOLER - DEHUMIDIFIER apparatus using the basic concept of Steady Flow Energy Equation considering AKE & APE are negligible. from the Law of Conservation of Mass and Energy mw = ma (W1-W2) GREF=ma (h2 - h1 ) - mw hwarrow_forward
- A refrigerant-22 vapour compression system includes a liquid-to-suction heat exchanger in the system. A heat exchanger is installed to warm the saturated vapour coming from the evaporator from -10 to 5°C with subcooling the liquid coming from the condenser at 30°C. The compressions are isentropic. (A) Calculate the coefficient of performance of the system with the heat exchanger. (B) If the compressor is capable of pumping 12.0 L/s measured at the compressor suction, what is the refrigeration capacity of the system with the heat exchanger. (C) What is the degree of subcooling obtained with the heat exchanger.arrow_forwardA. Calculate the thermal efficiency of a Rankine cycle in which the steam is initially dry saturated at 2 Mpa and the condenser pressure 7kN/m². Express this efficiency as a percentage of a Carnot cycle efficiency of the same limits of temperature. B. If the steam leaves the boiler at 350°C with the same pressure of the boiler and condenser given above. Explain why the Rankine efficiency in (A) is less than in (B), and why the ratio of efficiencies of the respective Rankine and Carnot is grater.arrow_forwardIn a nuclear power plant heat is transferred in the nuclear reactor to liquid sodium. The liquid sodium is then pumped to a heat exchanger where heat is transferred to steam. The steam leaves this heat exchanger as saturated vapor at 5 MPa, and is then superheated in an external gas fired superheater to 600°C. The steam then enters the turbine, which has one steam extaction point at 0.4 MPa, where steam flows to an open feedwater heater operating at this pressure. The turbine efficiency is 75% and the condenser pressure is 7.5 kPa. Determine the heat transfer in the reactor and in the superheater to produce a power (a) output of 80,000 kW. (b) What is the steam flow rate to the turbine? (c) What power motor is required to drive each of the pumps?arrow_forward
- A Cascade refrigeration system using R-32 and a heat exchanger is operating an evaporator with a capacity of 6 tons at a temperature of -30°C. If the heat exchanger pressure is 0.80 MPa and the condensing temperature is 50°C, determine the COP and the refrigerating efficiency of the system. Draw the schematic diagram of the system and assume ideal conditions.arrow_forwardAn R-22 vapor compression system utilizes liquid to suction heat exchanger in the system. The condenser pressure is 1191.90 kPa and the evaporator pressure is 354.30 kPa. The heat exchanger warms the refrigerant from the evaporator to 5OC. If the compression is isentropic, calculate the COP. Calculate: (a) the mass of refrigerant flow;(b) the refrigerating capacity if the compressor draws in 12 liters per second of R-22; (c)the compressor work and (d) the amount of cooling water in the condenser in kg/hr if ∆t of water is 10OCarrow_forwardAn air-conditioning absorption system has an evaporator capacity of 350 kW with a COP of 0.90 operating at a temperature of 25 C with a condensing temperature of 35 C. The same cooling tower was used to reject the heat from the condenser and the absorber operating 45 C & providing 1 kg/s of water plus lithium bromide solution to the generator. Consider the heat rejection ratio of condenser to evaporator is 1.05, Determine the following: 1. Heat given by the generator & the size of condenser in kW 2. Leaving condenser & evaporator enthalpies & the mass of refrigerant water flowing from the generator to the condenser then to the evaporator & to the absorber (using evaporator heat balance). 3. Weight of lithium bromide in kg/s, concentration in percent & enthalpy from the absorber to the generator in kJ/kg 4. Enthalpy from the generator to condenser in kJ/kg (using condenser heat balance) & concentration in percent & enthalpy from generator to absorber…arrow_forward
- Suppose that the regenerative heat exchanger is only 80% efficient, i.e., only 80% of theheat exhausted in step (B) is absorbed in step (D). For an ideal gas working fluid (Cv = 5/2 R, R = 8.3145 J/mol K) operating with the heat reservoirs at Th = 400 K and Tc = 300 K, determine how much work per mol of working fluid is needed to supplement the regenerative heat exchanger in step (D) and ensure that the cycle is completed. What is the new ηcycle in light of this additional work requirement? (the answer does not need to be numeric)arrow_forwardA Refrigerant 22 vapour compression system meant for food freezing oper- ates at 40°C condensing temperature and –35°C evaporating temperature. Its compressor is capable of pumping 30 L/s of vapour at suction. (a) Calculate the COP of the system and its refrigerating capacity. (b) If a regenerative heat exchanger is installed which allows suction vapour to be heated by 30°C with liquid from the condenser at 40°C to be cooled correspondingly, what is the new COP and refrigerating capacity?arrow_forwardA. Calculate the thermal efficiency of a Rankine cycle in which the steam is initially dry saturated at 2 Mpa and the condenser pressure 7kN/m2 . Express this efficiency as a percentage of a Carnot cycle efficiency of the same limits of temperature. B. If the steam leaves the boiler at 3500C with the same pressure of the boiler and condenser given above. Explain why the Rankine efficiency in (A) is less than in (B), and why the ratio of efficiencies of the respective Rankine and Carnot is grater. Ans [ 88.3%, 49.9%]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
How Shell and Tube Heat Exchangers Work (Engineering); Author: saVRee;https://www.youtube.com/watch?v=OyQ3SaU4KKU;License: Standard Youtube License