Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
expand_more
expand_more
format_list_bulleted
Related questions
Question
A new parabolic dish solar concentrator is being developed to supply electricity to a small remote community. The system operates with a Stirling engine connected to two heat reservoirs HR₁ and HR₂ as shown in Fig. Concentrated solar radiation Q˙ₛᵤₙ=200kW maintains HR₁ at constant temperature Tₕᵣ,₁=700℃, and a high performance heat sink device maintains HR₂ at temperature Tₕᵣ,₂=25℃. After some time of operation, an engineer working on the project realizes that the engine power output is performing below design specifications and only provides a power output of 120kW. After inspecting the system, they discover a contact resistance that causes the thermal communication between the two heat reservoirs and the engine to be imperfect in the sense that a finite temperature difference is required to establish heat transfer between each of the heat reservoirs and the engine.
Assuming the engine itself is internally reversible, estimate the rate of entropy generation in the engine’s surroundings due to the poor thermal communication.
Transcribed Image Text:Parabolic
dish solar
concentrator
Stirling
Engine
O sun = 200 kW
THR,1
= 700 °C
W
net
MECH
Q sink
THR,2 = 25°C
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by stepSolved in 2 steps with 1 images
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
- A heat pump operates with Refrigerant 134a as the working fluid. You are required to analyze its performance, and compare it with Camot heat pump. The data of the heat pump is as under: 23 - Thermodynamies-II Page 1 of 3 The heat pump is presently providing heating at a rate of 12 kW to maintain the interior of a building at 20°C. Outside temperature is 5°C. The refrigerant enters the compressor at 2.4 bar and increases the pressure to 8.0 bar. Efficiency of the compressor is 80%. a Temperatures at the principal states of the cycle, each °C b. Power input to the compressor, in kW c. Coefficient of performance Relate its performance with the specifications provided by the vendor i.e. COP = 8.5 and identify the possible reasons of differences. Draw Ts diagramarrow_forwardQ4/ A particular power plant operates with a heat source reservoir at 350 °C and a heat sink reservoir at 30 °C. It has a thermal efficiency equal to 55% of the Carnot engine therma' efficiency for the same temperatures. 1. What is the thermal efficiency of the plant? 2. To what temperature must the heat source reservoir be raised to increase the thermal efficiency of the plant to 35%?arrow_forwardThermodynamics. Please help me out A Carnot heat engine is used to power a Carnot refrigerator that operatesbetween 258.15 K and 293.15 K. In the heat engine, water is used as theworking fluid. Heat is added to the water at 473.15 K, where it changes fromsaturated liquid to saturated vapor. Heat is rejected from the heat engine atP=20 kPa and constant temperatue. Calculate(a) The heat added to the water per kilogram of water(b) The amount of heat that must be added to the water so that therefrigerator can remove 1 kJ of heat from the cold reservoir.arrow_forward
- Q5. A simple vapour compression refrigeration system of 60 kW cooling capacity that uses a water-cooled condenser. The power required by the compressor is 10 kW. The overall heat transfer coefficient of the condenser is 350 W/m².K and a heat transfer area of 17 m². If cooling water at a flow rate of 3.5 kg/s enters the condenser at a temperature of 31°C, what is the condensing temperature? Take the specific heat of water as 4.18kJ/kg.K. (20 Marka)arrow_forwardUsing the ideas in heat pumps under cyclic process, thoroughly explain the following(with diagram if possible)arrow_forwardA refrigerator uses a power input of 2 KW to cool a 5 C° space with the high temperature in the cycle as 50 c°. The heat removed from the cycle Q, is pushed to the ambient in a heat exchanger its heat transfer area is 24 m. Find the heat transfer coefficient required in W/m K. (Assume the cycle works on Carnot cycle) heat exchanger T amby ´REF) | T2= 5 C° 35 C TH= 50 carrow_forward
- Asking second time , Strictly don't use chatgpt. I need to understand the concept,give detailed solution in Handwritten format.arrow_forwardB) A reversible heat engine operates between two reservoirs at temperatures of 600°C and 40°C. The engine drives a reversible refrigerator which operates between reservoirs at temperatures of 40°C and -20°C. The heat transfer to the heat engine is 2000 kJ and the net work output for the combined engine refrigerator is 360 kJ. (i) Calculate the heat transfer to the refrigerant and the net heat transfer to the reservoir at 40°C. (ii) Reconsider (i) given that the efficiency of the heat engine and the C.O.P. of the refrigerator are each 40 per cent of their maximum possible values.arrow_forwardWhat is the best coefficient of performance for a refrigerator that cools an environment at -R, °C and has heat transfer to reservoir at 150.0°C? (b) How much work in joules must be done for a heat transfer of 4186 kJ from the cold environment? (c) What is the cost of doing this if the work costs 0.1 Rs per 3.60 × 10° J (a kilowatt-hour)? (d) How many kJ of heat transfer occurs into the warm environment? where, R, is last two digits of registration no. (e.g. for registration no. 11603309 take R¡ as 9 °Carrow_forward
- Heat Engine you are an engineering consultant who has been tasked with providing power to a remote village. After some initial evaluation it was determined that a simple four-device heat engine with water as the working fluid is the best option to produce electricity at the location. Natural gas and wood are abundantly available as a fuel source and 400 kW of power is needed. Design a heat engine to meet the stated requirements.arrow_forwardAn engineer designed an refrigerator working between 300 K and 550 K. Determine the COP of the refrigerator.arrow_forwardA building is being heated through the help of a Carnot heat pump and is required to be maintained at 20 degrees C always. When the temp outside drops to -10 degrees C, the rate at which heat is lost from the building is 25kW. What is the minimum electrical power required (kW) in order to drive the heat pump?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 Press
Mechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSON
Thermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education 
Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEY
Mechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage Learning
Engineering 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