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 ... !!

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

Chapter22: Condensers

Section: Chapter Questions

Problem 7RQ: When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be...

See similar textbooks

Similar questions

When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be higher in temperature than the entering air temperature.
A power station consists of a four-unit coal fired power station, having a combined capacity of 2,880 MW. The current efficiency of each unit is around 37.7%. You are asked to improve the thermal efficiency of each unit by lowering the condenser pressure. To simplify this task, assume that each unit operates on a simple ideal Rankine cycle. If the superheated vapour enters the turbine at 10 MPa and 500 ֯C and is cooled in the condenser at a lower pressure 10 kPa, determine the quality of the steam at the turbine exit and the thermal efficiency of the cycle for one unit.
An Actual Rankine cycle operates on a boiler and condenser pressure of 2MPa and 20kPa respectively. Steam leaves the boiler at 500°C. The cycle produces a Net Power of 10MW. a.) Determine the steam rate of the turbine. (kg/kW-hr) b.) Determine the steam rate of the turbine. (kg/kW-hr) c.) Determine the heat rate of the cycle (kJ/kW-hr) ROUND OFF ANSWER TO SIX SIGNIFICANT FIGURES
Q.3 A. Calculate the thermal efficiency of a Rankine cycle in which the steam is initially dry saturated at 2 Mpa and the condenser pressure 75 kN / 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 greater.
Given a rankine cycle with reheat operating with the following conditions: Boiler Exit Conditions: 10.111 Mpa, 600.111C , and 7 kg/s Reheat One leg Exit Conditions: 1.6 MPa and 600.111 C Reheat two leg Exit conditions: 1.1111 MPa and 500.111C Reheat three leg exit conditions: 0.8111MPa and 400.111C Condenser Operating Pressure: 30.111 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.
What is the heat transfer rate at the condenser in an actual power cycle of 100,000 kW rating with turbine efficiency of 0.80 and having steam fed up in a turbine at 7500 kPa and 450 C. The steam going out of the turbine is at 24 kPa. The condenser produces saturated liquid. Assume negligible pump work.
In a steam power plant operating according to the ideal Rankine cycle at 4MPa pressure and 400CIt enters and condenses in the condenser at a pressure of 100kPa. Determine the efficiency of the cycle.What would the efficiency be if the steam entered the turbine at 5MPa pressure and condensed at 90kPa pressure.
Refrigerant 134a is the working fluid in a solar power plant operating on a Rankine cycle. Saturated vapor at 60 degree Celsius enters the turbine, and the condenser operates at a pressure of 6 bar. The rate of energy input to the collectors from solar radiation is 0.4 kW per m2 of collector surface area. Determine the minimum possible solar collector surface area, in m2, per kW of power developed by the plant.
In a Refrigerant 12 system which serves a 212 kw evaporator at - 30 0C. The system uses two stage compression with intercooling and removal of flash gas. The condenser temp is 400C . Given that, h2=356kJ/kg, h4=367kJ/kg Compute the following: a.) mass flow rate at low stage compressor (m1)ANSWER: 1.53661 kg/s b.) mass flow rate at high stage compressor (m3)ANSWER: 2.11791 kg/s c.) low stage compressor workANSWER: 27.43931 kw d.) high stage compressor workANSWER: 32.63926 kw e.) total compressor workANSWER: 60.078575 kw f.) COPANSWER: 3.52871 g.) heat rejected in the condenserANSWER: 272.07857 kw
A 211 MW steam power plant is proposed that will operate in a Rankine cycle with a condenser pressure of 0.06 bar and the boiler pressure is 50 bar. The maximum temperature in the boiler is 500°C a)Determine the overall efficiency and work ratio of the cycle.
Problem 1 (Using thermodynamic tables)A large refrigeration plant is to be maintained at -12 C. It requires refrigeration at a rate of 120 kW.The condenser of the plant is to be cooled by liquid water, which experiences a temperature rise of 10 C as it flows over the coils of the condenser. Assuming the plant operates on the ideal vapor-compression cycle using refrigerant- 134a between the pressure limits of 100 and 700 kPa, determine (a) the mass flow rate of the refrigerant, (b) the power input to the compressor, and (c) the mass flow rate of the cooling water
What is the thermal efficiency of a Rankine cycle of 100,000 kW rating with turbine efficiency of 0.80 and having steam fed up in a turbine at 7500 kPa and 450 C. The steam going out of the turbine is at 24 kPa. The condenser produces saturated liquid. Assume negligible pump work.