14.14. A three-stage evaporator is fed with1.25 kg/s of a liquor which is concentratedfrom 10 to 40 per cent solids by mass. Theheat transfer coefficients may be takenas 3.1, 2.5 and 1.7 kW/m² K, respectively,in each effect. Calculate the steamflow at 170 kN/m² and the temperaturedistribution in the three effects, if:(a) the feed is at 294 K, and(b) the feed is at 355 K.Forward feed is used in each case andthe values of U are the same for the twosystems. The boiling point in the thirdeffect is 325 K and the liquor has noboiling point rise.O

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Answered: 14.14. A three-stage evaporator is fed…

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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9. When developing a certain power, the specific fuel con- sumption of an internal combustion engine is 0-255 kg/kWh (brake) and the mechanical efficiency is 86% Calculate (i) the indicated thermal efficiency, and (ii) the brake thermal efficiency, taking the calorific value of the fuel as 43-5 MJ/kg. If 35 kg of air are supplied per kg of fuel, the air inlet being at 26°C and exhaust at 393°C, find (iii) the heat energy carried away in the exhaust gases as a percentage of the heat supplied, taking the specific heat of the gases as 1-005 kJ/kg K.
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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3.) An ammonia compressor operates at evaporator pressure of 316.02 kPa and a condenser pressure of 1557 kPa. A twin-cylinder compressor with bore to stroke ratio of 0.85 is to used at 1200 rpm. The actual volumetric efficiency is 92% and compression and mechanical efficiency is 78% and 80% respectively. For a cooling capacity of 25 TR, (a) the sketch the p-h diagram labeling the evaporating and condensing temperature and pressures (b) define the all properties of ammonia taken from saturation table. Determine (c) the quantity of cooling water in the condenser in kg/min if the increase in temperature is 8°C, (d) the bore and stroke expressed in cm and (e) the size of the driving motor in hp. Given: h2 = h at 1557 kPa and s2 = s1 1695 kJ/kg
A plant using R134a refrigerant has a cooling capacity of 352 kW of refrigeration. It evaporates at 0 Cand condenses at 35 C, with the 5 of superheat at the evaporator outlet and 5 K of sub-cooling at the condenser outlet. Assuming isentropic compression and ignoring pressure drops in the piping, the evaporator and condenser, determi the following; a) The refrigeration effect b) The mass flow rate of refrigerant ) The compressor power d) The rate of heatrejection at the condenser e) The COP 0 The corresponding Carnot COP g) The percentage Carnot-efficiency
An ammonia simple vapor operates between evaporator and condenser temperature of -20°C and 35°C respectively. The system used producing 5000kg of ice in 20hrs. A 100x200mm compressor with a compression efficiency of 80% and electric input to the motor driving the compressor is 14kW. Motor efficiency is 90%. Determine: (a) Qe (b) Work indicated (c) Brake work (d) Mechanical efficiency
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.
Water is used in a heat exchanger to cool 5 kg/s of air from 400 to 200 C. Calculate the minimum mass flow rate of the water if Twater =10 C.
A vapour compression refrigerator working with Freon-12 has its temperature range -10°C and 30°C. The Vapour enters the compressor dry and under cooled by 5°C in the condenser. For a capacity of 15 TOR, find: C.O.P Entropy Temp °C 30 -10 Enthalpy hf 64.59 26.87 Hfg 135.03 156.31 ng 199.62 183.19 Sf 0.24 0.108 Sg 0.6853 0.7019
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A vapor compression refrigeration systemhas an enthalpy of saturated liquid at the hightemperature side is 341.769 kJ/kg while at lowtemperature side is 131.27 kJ/kg and a latentheat of vaporization of 1312.63 kJ/kg. If themass flow rate of refrigerant is 0.50 kg/s.compute the tons of refrigeration.
Present step by step solution. If EB in to be used, start in System Under Study, then, Fluid Under Study, and draw BED.

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