A parabolic trough plant operating with a steam temperature of 375°C has a reported efficiency of 37.5%. Heat is rejected in the condenser at 25°C. What efficiency would you predict is achievable from a central receiver system with a steam cycle temperature of 540°C assuming the efficiency of the generation system is a fixed percentage of the Carnot efficiency. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BI U S Paragraph Open Sans,s... v 10pt Is ... !!

A parabolic trough plant operating with a steam temperature of 375°C has a reported efficiency of 37.5%. Heat is rejected in the condenser at 25°C. What efficiency would you predict is achievable from a central receiver system with a steam cycle temperature of 540°C assuming the efficiency of the generation system is a fixed percentage of the Carnot efficiency. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BI U S Paragraph Open Sans,s... v 10pt Is ... !!

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Consider a two-stage cascade refrigeration cycle with a flash chamber as shown in the figure with refrigerant-134a as the working fluid. The evaporator temperature is -10°C and the condenser pressure is 1600 kPa. The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.45 MPa. Part of the refrigerant evaporates during this flashing process, and this vapor is mixed with the refrigerant leaving the low-pressure compressor. The mixture is then compressed to the condenser pressure by the high-pressure compressor. The liquid in the flash chamber is throttled to the evaporator pressure and cools the refrigerated space as it vaporizes in the evaporator. The mass flow rate of the refrigerant through the low-pressure compressor is 0.11 kg/s. Assume that the refrigerant leaves the evaporator as a saturated vapor and…
A refrigeration system using refrigerant 12 is to have a refrigerating capacity of 80 kW. The cycle is a standard vapor-compression cycle in which the evaporating temperature is -15°C and the condensing temperature 30°C. Determine the suction compressor pressure in kPaa. 189.5 175.9 744.9 182.7
Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Consider a two-stage cascade refrigeration cycle with a flash chamber as shown in the figure with refrigerant-134a as the working fluid. The evaporator temperature is -10°C and the condenser pressure is 1600 kPa. The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.45 MPa. Part of the refrigerant evaporates during this flashing process, and this vapor is mixed with the refrigerant leaving the low-pressure compressor. The mixture is then compressed to the condenser pressure by the high-pressure compressor. The liquid in the flash chamber is throttled to the evaporator pressure and cools the refrigerated space as it vaporizes in the evaporator. The mass flow rate of the refrigerant through the low-pressure compressor is 0.11 kg/s. Assume that the refrigerant leaves the evaporator as a saturated vapor and…
The engine on a steam ship runs on the Rankine cycle. The steam leaves the boiler at 20 bar and 350°C. The turbine has an efficiency of 75% and an outlet pressure of 1 bar. The pressure changes in the boiler and condenser can be considered negligible, and the liquid leaving the condenser is saturated. A. Determine the operating temperature of the condenser, and compute the efficiency of a Carnot cycle operating between the boiler and condenser temperatures. B. Determine the actual efficiency of this Rankine cycle and compare it to the Carnot efficiency. C. When the Titanic was sinking, the Carpathia received the S.O.S. and immediately set course to attempt a rescue. The captain of the Carpathia ordered the hot water turned off in the passengers’ cabins (Lord, 1955). What effect do you expect this action had?
Given a rankine cycle with reheat operating with the following conditions: Boiler Exit Conditions: 10.356 Mpa, 600.356C , and 7 kg/s Reheat One leg Exit Conditions: 1.6 MPa and 600.356 C Reheat two leg Exit conditions: 1.1356 MPa and 500.356C Reheat three leg exit conditions: 0.8356MPa and 400.356C Condenser Operating Pressure: 30.356 kPa Assume all devices are ideal. Determine the power output, heat transfer rate input required, and thermal cycle efficiency of the plant. Draw the schematic diagram and T-s diagram.
Provide a complete given and computation. Include all the decimals. An ideal reheat regenerative turbo-generator unit receives 9.0 MPa of throttle steam at 390°C.Reheat occurs at the first bleeding point of 3.40 MPa. The second and third extractions are at 0.98 MPa and 0.28 MPa, respectively. For a condenser vacuum of 550 mm Hg, find (a) the cycle thermal efficiency and (b) the engine thermal efficiency.
The figure below shows a two-stage vapor-compression refrigeration system with ammonia as the working fluid. The system uses a direct-contact heat exchanger to achieve intercooling. The evaporator has a refrigerating capacity of 40 tons and produces -30°F saturated vapor at its exit. In the first compressor stage, the refrigerant is compressed adiabatically to 140 lbf/in.², which is the pressure in the direct contact heat exchanger. Saturated vapor at 140 lbf/in.² enters the second compressor stage and is compressed adiabatically to 250 lbf/in.² Each compressor stage has an isentropic efficiency of 85%. There are no significant pressure drops as the refrigerant passes through the heat exchangers. Saturated liquid enters each expansion valve. Determine: Expansion valve 6- Condenser Direct contact heat exchanger Expansion valve (a) the ratio of mass flow rates, m3/my. (b) the power input to each compressor stage, in horsepower. (c) the coefficient of performance Comp Comp Evaporator
Steam from a turbine with inlet pressure 30 bar and temperature 350°C is bled at 5 bar and 1 bar to supply a two-stage regenerator to heat up condensate leaving the turbine at 0.08 bar. In each stage, the condensate is heated up to the saturation temperature of the bled steam and the bled steam itself condenses completely. Remember: in a regenerator, there is no contact between the two streams, only heat exchange. of Consider the amount of steam bled at 5 bar and 1 bar, respectively, to be m¡ and m2 kg per steam supplied to the turbine. For the first stage, m¡ kg of bled steam at 5 bar heats each kg of condensate arriving from the second stage without any contact (that is, regeneration). Then, m¡ kg of condensate derived from the bled steam drains into the steam space of the second stage at 1 bar without heat loss. The combined drain from the second stage at 1 bar consists of mi+m2 kg per kg of steam supplied to the turbine. The combined drain is cooled to the condenser temperature…
Question 3: A 4-stroke, 4-cylinder Spark Ignition engine is running at speed of 1800rpm following an air standard Otto-cycle. The engine has a total displacement of 750cm and a clearance of 90cm. The heat was added at the rate of 42kJ/s. From the data given, calculate the following: a. Mass of air entering the engine. (kg/s) b. Indicated power output of the engine. (kW) c. Heat rejection Rate (kW) d. Thermal efficiency of the cycle (%). Compare this efficiency value if the cycle has to run on an air standard Carnot Cycle.
A steam power plant operates between a boiler pressure of 58 bar and a condenser pressure of 0.05 bar. Calculate for these limits the cycle efficiency for a Carnot cycle using wet steam
The ordinary household refrigerator is a good example of the application of this cycle. Evaporator Freezer compartment Capillary ube Kitchen air 25°C -18°C Condenser coils 3°C Comprosor HW: Q1: Refrigerant-134a is the working fluid in an ideal compression refrigeration cycle. The refrigerant leaves the evaporator -20°C and has a condenser pressure of 0.9 MPa. The mass flow rate is 3 kg/min. Find COP,, COPR. Camat for same Tmas and Tmin, and the tons of refrigeration. Q2: A simple VCRC using R-134a operates with a condensing temperature of 30°c and an evaporating temperature of -20°c .The system produces 50 kw of refrigeration. Determine the : a) Thermodynamic property values at the four main state points of the cycle, b) COP, c) Rate of refrigerant flow. Another measure of the effectiveness of the refrigeration cycle is how much input power to the compressor, in horsepower, is required for each Ton of cooling. The unit conversion is 4.715 hp per Ton of cooling To convert from COP to…
! Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Consider a two-stage cascade refrigeration cycle with a flash chamber as shown in the figure with refrigerant-134a as the working fluid. The evaporator temperature is −10°C and the condenser pressure is 1600 kPa. The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.45 MPa. Part of the refrigerant evaporates during this flashing process, and this vapor is mixed with the refrigerant leaving the low-pressure compressor. The mixture is then compressed to the condenser pressure by the high-pressure compressor. The liquid in the flash chamber is throttled to the evaporator pressure and cools the refrigerated space as it vaporizes in the evaporator. The mass flow rate of the refrigerant through the low-pressure compressor is 0.11 kg/s. Assume that the refrigerant leaves the evaporator as a saturated vapor…