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- Determine the power required for a forced draught and induced draught fan in a boiler having coal consumption of 25 kg/min and air/fuel ratio of 19 by mass. The ambient air temperature and hot gas temperature at exit are 30C and 140 C respectively. Draught required is equivalent to 32.2 mm of water and mechanical efficiency of motor/fan is merely 70%alzIn a boiler installation the height of chimney is 38 m and the hot gas temperature is 570 K andambient air temperature is 300 K. Considering the diameter of chimney to be 2m, air/fuel ratiobeing 19 determine the mass flow rate of flue gases flowing out. Determine the power required for a forced draught and induced draught fan in a boiler having coalconsumption of 25 kg/min and air/fuel ratio of 19 by mass. The ambient air temperature and hotgas temperature at exit are 30C and 140C respectively. Draught required is equivalent to 32.2 mmof water and mechanical efficiency of motor/fan is merely 70%.Determine the power required for a forced draught and induced draught fan in a boiler having coalconsumption of 25 kg/min and air/fuel ratio of 19 by mass. The ambient air temperature and hotgas temperature at exit are 30C and 140C respectively. Draught required is equivalent to 32.2 mmof water and mechanical efficiency of motor/fan is merely 70%
- Compressed air enters a 0.2 m diameter circular air duct at a temperature of 20°C and a pressure of 200 kPa at a speed of 5 m/s. The air heats up during the flow and leaves the pipe (duct) at a temperature of 60°C and a pressure of 180 kPa. a) Mass flow rate of air ? b) The power of the heater used c) The outlet velocity of the airIn an oil cooler of the counter flow type 5000 kg per hour of oil of specific heat 0.6 are cooled from 40°C to 24°C by means of 6000 kg per hour of water which enters at 15°C.find the cooling surface required if the overall coefficient of heat transmission is 3000 kcal/m^2 hour °C.A computer, cooled by a fan, containseight printed circuit boards, dissipating 10 W ofpower each one. The height of the cards is 12 cm and theirlength is 18cm. The cooling air is supplied by a25W fan mounted in the inlet. If the increase ofair temperature should not be higher than 10 ° C when passing throughthe computer case, determine (a) the air flow ratethat the fan must deliver and b) the fraction of increase ofair temperature, due to heat generated by the fanand its engine.
- For a fixed compressor inlet velocity and flow area, explain the effect of increasing compressor inlet temperature (i.e., summertime operation versus wintertime operation) on the inlet mass flow rate and the net power output with all other parameters of the problem being the same.Five hundred kilograms per hour of steam drives a turbine. The steamenters the turbine at 44 atm and 450C at a linear velocity of 60 m/sand leaves at a point 5 m below the turbine inlet at atmosphericpressure and a velocity of 360 m/s. The turbine delivers shaft work at arate of 70 kW, and the heat loss from the turbine is estimated to be 104kcal/h. Calculate the specific enthalpy change associated with theprocessSOLVE THE PROBLEM AND SHOW THE DETAILED SOLUTION A steam condenser receives 10 kg per second of steam with an enthalpy of 2,570-kJ/kg. The steam condenses into liquid and leaves with an enthalpy of 160kJ/kg. Cooling water passes through the condenser with temperature increases from 13 to 24 Calculate the cooling water flow rate in kg/s.
- A garden hose with an inside diameter of 2 cm carries water with a mass flow rate of 60 liters per minute at 20°C with an enthalpy of 83 kJ/kg. Pression is 78KPa. The outlet of the hose has a tube that changes its diameter. a) What will be the outlet diameter to achieve a speed of 1 m/s b) What is the enthalpy change of the fluid?Hot fluid enters at a flow rate of 3 kg/sec with an inlet temperature of 150 C while cold fluid enters 5 kg/sec and with an inlet temperature of 60 C. Determine the maximum heat transfer that can happen during the heat exchange process? Take specific heat value of the fluid as 2000 J/(kgC) not sufficient information 150 kW 1 MW 540 kW none of the given 900 kWHot fluid enters at a flow rate of 3 kg/sec with an inlet temperature of 150 C while cold fluid enters 5 kg/sec and with an inlet temperature of 60 C. Determine the maximum heat transfer that can happen during the heat exchange process? Take specific heat value of the fluid as 2000 J/(kgC)