A boiler with 80% efficiency produces steam at 40bar and 500 C at a rate of 1.128kg/s.The temperature of the feed water is raised from 25 C to 125 C in the economizer and theambient air is drawn to the boiler at a rate of 2.70 kg/s at 16 C. The flue gases leave thechimney at rate of 3 kg/s at 150 C with specific heat of 1.01 kJ/kg.K. The dryness fractionof steam collected in the steam drum is 0.95.1- Determine the heat value of the fuel.2- The equivalence evaporation.3- Draw the heat balance sheet.

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Answered: A boiler with 80% efficiency produces…

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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Steam is generated at 4.10 Mpa and 440°C and condensation occurs at 0.105 MPa a. For a Rankine engine operating between these limits, computethe thermal efficiency and the heat rate b. Considering that a Rankine cycle occurs between same limits, determine QA, QR, Wnet and eth c. What mass flow rate is required for a net output of 30 000 kW Don't answer the given problem, just give me the schematic diagram and t-s diagram of the given problem
The evaporator (a heat exchanger) in an A/C unit has R-410A entering at -20 °C and a quality of 30% and leaves at the same temperature and a quality of 100%. The COP of the air conditioner is known to be 1.3 and the mass flow rate is given as 0.013 kg/s. Find the power input to the cycle. (Note that, here, the evaporator is the part of the A/C unit that accepts [i.e., withdraws] heat from the room maintained at a cold temperature)
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).
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The steam rate to a turbine for variable output is controlled by a throttle valve in the inlet line.Steam is supplied to the throttle valve at 1,700 kPa and 225°C. During a test run, the pressure atthe turbine inlet is 1000 kPa, the exhaust steam at 10 kPa has a quality of 0.95, the steam flowrate is 0.5 kg/s, and the power output of the turbine is 180kW. 1. What are the heat losses from the turbine? 2. What would be the power output if the steam supplied to the throttle valve were expandedisentropically to the final pressure?
A steam powerplant operates on a rankine cycle the steam enters the turbine at 7 mpa 550°c with a velocity of 3m/s . Its dischaRge to the condenser at 20kpa with the velocity of 90m/s calculate the network in kw for a flow of 37.8kg/s
In a 14 TR ammonia refrigeration plant, the condensing temperature is 250C and evaporating temperature -100C. The refrigerant ammonia is sub-cooled by 5 0C before passing through the throttle valve. The vapor leaving the evaporator is 0.97 dry. Find: 1. Coefficient of performance: and 2. Power required. Use refrigerant table for properties of ammonia at 250C and -100C.
11. 30 tonnes of ice from and at 0°C is produced in a day of 24 hours by an ammonia refrigerator. The temperature range in the compressor is from 298 K to 258 K. The vapour is dry saturated at the end of compression and expansion valve is used. Assume a co-efficient of performance of 60% of the theoretical and calculate the power in kW required to drive the compressor. Latent heat of ice is 334.72 kJ/kg. Enthalpy Entropy of liquid Entropy of vapour kJ/kg Тетр. K kJ/ kg kJ/ kg K Liquid Vapour 298 100.04 1319.22 0.3473 4.4852 258 -54.56 1304.99 - 2.1338 5.0585 [Ans. 21.59 kW]
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A steam condenser receives 10 kg per second of steam with an enthalpyof 2570 KJ/kg. Steam condenses into liquid and leaves with an enthalpy of160 KJ/kg, if cooling water passes through the condenser with temperatureincreases from 13 o C to 24 o C. Calculate the cooling water flow rate inkg/sec.
I need the workings ASP the answers are there questionn 4 4. A boiler produces 6 tonnes/hour of steam at a pressure of 1.8 MPa and a temperature of 250ºC.Feedwater enters at a temperature of 39ºC. At exit from the economizer part of the boiler thetemperature is 72ºC. At exit from the evaporator part of the boiler the steam is 90 % dry.Energy is supplied by 650 kg of coal per hour, which has a calorific value of36 MJ/kg. The A/F ratio is 25 : 1. The temperature of the flue gas at entry to the economizerpart of the boiler is 430ºC. The average specific heat at constant pressure of the flue gas inthe economizer is 1045 J/kg.K.4.1 Calculate the efficiency of the boiler. [70.5 %] this one is the answer 4.2 Draw up an energy balance, on a kJ/kg coal basis, with percentages of the total energysupplied. [economizer 3.6 %, evaporator 59 %, superheater 8 %,other 29.4 %]
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