Hint, find enthalpy, entropy at each state As a scoping calculation for a PWR design, you are trying to determine the approximate range ofconversion efficiencies of the secondary side as a function of condenser pressure. The primary side ofthe system provides water to the steam generator at 315°C and it exits at 285°C. Its flow rate on theprimary side is 1.95x10 kg/s and the pressure is 15.5 MPa. The average specific heat for the primarykjwater is 5.54 (5 points total)kg °C°a) Determine the power and heat added at the steam generator.b) The pressure of the steam generator secondary side is 7.75 MPa. Provide a table and a plotfor the following items as the condenser pressure varies from 0.005 MPa to 0.25 MPaa. Cycle efficiency (b. Secondary mass flow rateC.Electric generation.c) What general conclusion(s) can be drawn from the results? (1

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Answered: As a scoping calculation for a PWR…

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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A direct contact condenser of the spry type receives 60 kg/s of 925 quality steam at 0.06bar. A dry cooling tower system cools the feedwater to 15 oC. calculate the condensatepump volume flow rate , and the pump power input if the pressure losses in the dry coolingtower system are 2 bar and the pump efficiency is 0.7.
Cold storage uses R134a, the evaporator temperature is -7C and the condenser temperature is 32C. The cooling load is 5.3103 kJ/min. The cycle is ideal. Determine: 1. Mass flowrate of the refrigerant. 2. Coefficient of Performance (COP). - If the water condenser is used that enter at 24C and exit at 30C. determine the water flowrate.
2. A cascade refrigeration system uses R22 in the low temp unit and R12 in the high temp unit. The system develops 28 kW of refrigeration at -45°C. The R12 system operates at -12°C evaporating temp and 40°C condensing temp. There is a 10° overlap of temperatures in the cascade condenser. Calculate the (a) mass flow rate of R22, (b) mass flow rate of R12
Problem 4 In an ammonia system one evaporator is to provide 180 kW of refrigeration at -30°C and another evaporator is to provide 200 kW at 5°C. The system uses two stage compression with intercooling and flash gas removal as shown below. The condensing temperature is 40°C. Calculate the power requirement and COP of the system. Condenser 40°C High-stage compressor Evaporator 5°C 6. 200 kW Intercooler and flash tank Evaporator -30°C 180 kW 8 Low-stage compressor
Problem solving
3)A cascade refrigeration system uses R22 in the low temp unit and R12 in the high temp unit. The system develops 30 kW of refrigeration at -40C. The R12 system operates at -10C evaporating temp and 38C condensing temp. There is a 10 degree overlap of temperatures in the cascade condenser. Calculate the (a) mass flow rate of R22, (b) mass flow rate of R12, (c) the power required by R22 compressor, and the power required by R12 compressor.
your client needs to know about the mass flow rate ofsteam needed for a 1500 kW plant. The heat supplied to the steamin the boiler is 2700 k//kg, the heat rejected by the steam to thecooling water in the condenser is 2000 kJ/kg, and the feed pumpwork required to pump the condensate back into the boiler is 3.5 kWCalculate the mass flow of steam required
A. 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.
Question 2 of 4 - / 25 An office building requires a heat transfer rate of 30 kW to maintain theinsidetemperature at 21°Cwhen theoutsidetemperature is O°C. Avapor-compression heat pump with Refrigerant 134a astheworkingfluid isto beused to provide the necessary heating. The compressoroperates adiabatically with an isentropic efficiency of 82%. Determine appropriate evaporator and condenser pressures of a cyclefor this purpose assuming ATcond = ATevap = 10°C, as shown in the T-sdiagram. The refrigerantexitstheevaporator assaturated vapor and exitsthecondenser as saturated liquid at the respective pressures. AT cond Outside air 21°C 0°C Inside air ATent Condenser Evaporator Expansion valve Compressor Step 1 Determinethe mass flow rate of refrigerant, in kg/s. m = kg/s Attempts: unlimited Submit Answer Save for Later Using multiple attempts will impact your score. 5% score reduction after attempt 2 Step 2 The partsof thisquestion must becompleted in order. This partwill be availablewhen…
A Freon 12 simple saturation cycle operates at temperatures of 35°C and 15°C for the condenser and evaporator respectively. (a) Determine the COP and HP/TR of the system. If a liquid-vapor heat exchanger is installed in the system, with the temperature of the vapor leaving the heat exchanger at 15°C, (b) what will be the change in the COP and HP/TR?
A food storage locker requires a refrigeration system of 2,400 kJ/min capacity at an evaporator temperature of -10OC and a condenser temperature of 30OC. The refrigerant used is freon-12 and sub-cooled by 6OC before entering the expansion valve and vapor is superheated by 7OC before leaving the evaporator coil. The compression of refrigerant is isentropic. The refrigeration compressor is two-cylinder, single-acting with stroke equal to 1.25 times the bore diameter and operates at 1000 rpm. Determine: (a) refrigerating effect, (b) mass of refrigerant to be circulated, (c) theoretical piston displacement per minute, (d) theoretical power to run the compressor in kW, (e) heat removed from the condenser per min. (f) theoretical bore and stroke of compressor.
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?…

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