volume of the cylinder which would be requiredto accommodate the rapidly expanding steam at the lower pressures isnot really justified when considering the small extra amount of workwhich is made available. The extra work is given by the area ABC on theP-V diagram.The cycle with early release is called the modified Rankine cycle.EXAMPLE 89Steam is supplied from a boiler to a steam engine at a pressure of1-1 MN/m2 and at a temperature of 250°C. It is expanded isentropically toa release pressure of 0-28 MN/m2. Its pressure then falls at constant volumeto 35 kN/m2 at which pressure it is exhausted to a condenser. In thendenser the steam is condensed to water with no undercooling and thiswater is then pumped back into the boiler. Determine: 290STEAM PLANT(a) the Rankine efficiency;(b) specific steam consumption in kg/kW h;(c) the Carnot efficiency for the same temperature limits of the cycle.1 MN/m2150-28 MN /m235 kN/m 4

From the steam properties table, write the enthalpy and entropy of the steam at 250oC and 1.1 MN/m2.…

Answered: EXAMPLE 89 Steam is supplied from a…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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PROBLEM: A flashed-steam geothermal power plant is located where underground hot water is available as saturated liquid at 715 kPa, The well head pressure is 680 kPa. The flashed steam enters a turbine at 635 kPa and expands to 15 kPa, when it is condensed. The flow rate from the well is 35.3 kg/s. Determine: Draw the T-S diagram The mass flow rate of steam in kg/s The power produce in KW The cooling water flow in kg/s if water is available at 25 oC and a 15°C rise is allowed through the condenser.
Thermodynamic
In refrigeration process, a region is cooled and the temperature was maintained at -15oC. The cooling water used in the refrigeration is 25oC. If the refrigerant is HFC-134a, and the heat transfer temperature difference is 10oC, Calculate COP (ω) and mass flowrate for a vapor-compression cycle if the rating of the refrigeration process is 100,000 kJ/h and the efficiency of the compression is 0.75.
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ercise 6 6.1 A surface condenser is fitted with separate air and condensate outlets. A portion of the cooling surface is screened from the incoming steam and the air is passes over these screened tubes to the air extraction and becomes cooled below the condensate temperature. The condenser receives 20 000kg/hr of dry saturated steam at 36.2°C. At the condensate outlet the temperature is 34.6°C TK and at the air extraction the temperature is 29°C. The volume of air and vapour leaving the condenser is 3.8m3/min. Assume constant pressure throughout the condenser, calculate: 6.1.1 the mass of air removed per 10 000kg of steam (2.63kg); 6.1.2 the mass of steam condensed in the air cooler per minute (0.5kg/min)%3B 6.1.3 the heat rejected to the cooling water (13451kW).
3- Milk at 400C with a specific temperature of 3.85 kJ / kg K will be pasteurized at 75 oC using saturated steam at 120 oC in a plate heat exchanger. The heat exchanger operates in parallel current. In heating, the latent heat of the steam is used. What is the steam / milk ratio accordingly? The data required for steam is given in the table below. Enthalpy (MJ / kg) Temperature (oC) Absolute pressure (kPa) Saturated liquid Evaporation Saturated steam75 38.5575 0.31394 2.3214 2.6354120 198.54 0.50372 2.20225 2.70607 A. 17,75B. 56.33C. 0,056D. 0,017E. 68,7
Steam enters the turbine at 10 MN/m? and 450°C. The steam expanded isentropically in the turbine down to the condenser pressure of 20 kN/m?. The power developed by the plant is 5600 kW. The condensate leaving the condenser is pumped to the boiler pressure isentropically. Taking into account the pump work and calculate: The mass of steam generated in the boiler. • Cycle thermal efficiency. • Specific steam consumption. Draw the cycle on a T-s diagram. Hint: 1 MN/m = 10 bar %3D
Steam is supplied to a two-stage turbine at 40 bar and 350°C. It expands in the first turbine until it is just dry saturated, then it is re-heated to 350°C and expanded through the second-stage turbine. The condenser pressure is 0.035 bar. Calculate the work output and the heat supplied per kilogram of steam for the plant, assuming ideal processes and neglecting the feed-pump term. Calculate also the specific steam consumption and the cycle efficiency
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