Thermal Power Engineering Answers

Consider an ordinary shower where hot water at 60°C is mixed with cold water at 10°C. If it is desired that a steady stream of warm water at 45°C be supplied, determine the ratio of the mass flow rates of the hot to cold water. Assume the heat losses from the mixing chamber to be negligible and the mixing to take place at a pressure of 150 kPa.

Refrigerant-134a is to be cooled by water in a condenser. The refrigerant enters the condenser with a mass flow rate of 6 kg/min at 1 MPa and 70ºC and leaves at 35°C. The cooling water enters at 300 kPa and 15°C and leaves at 25ºC. Neglecting any pressure drops, determine (a) the mass flow rate of the cooling water required and (b) the heat transfer rate from the refrigerant to water

1.    Consider an ordinary shower where hot water at 60°C is mixed with cold water at 10°C. If it is desired that a steady stream of warm water at 45°C be supplied, determine the ratio of the mass flow rates of the hot to cold water. Assume the heat losses from the mixing chamber to be negligible and the mixing to take place at a pressure of 150 kPa. 

You given a number as the an input you have too display all the numbers from O till X

Input X 

Output

1

2

1

X

Two boilers one with super heater and other without super heater are delivering equal quantities of steam into a common main. The pressure in the boilers and main is18 bar. The temperature of steam from a boiler with a super heater is 350°C and temperature of

the steam in the main is 250°C.

Determine the quality of steam supplied by the other boiler. Take Cpsteam = 2.25 kJ/kgK.

Find out about the wall construction (number and type of layers) of a sauna (treatment and/or relaxation room), thereby determining the heat transfer mode, the range of ambient conditions under which they operate, typical heat transfer coefficients on the inner and outer surfaces of the wall, and the heat generation rates inside. Determine the size and methodology of the heating and air-conditioning system that will be able to maintain the typical sauna conditions, for when 10 persons are inside the sauna at the same time.

Find out about the wall construction (number and type of layers) of an atmospheric diving-suit (ADS), the heat transfer mode, the range of ambient conditions under which they operate, typical heat transfer coefficients on the inner and outer surfaces of the wall, and the heat generation rates inside. Determine the size and methodology of the cooling and/or heating system that is applied to maintain the diver body temperature from extreme low temperature conditions (say 3 °C) at depths reaching 600 m below sea level.

A four-stroke petrol engine has the following data:

      Number of cylinders=4

           Fuel used = 19.2 kg/hour

           Fuel to air ratio = 1:16 by weight

          Suction pressure = 1bar

          Suction temperature = 30^oC

      Stroke to bore ratio = 1.25

      Engine speed = 2400rpm

       Volumetric Efficiency = 78%

Find the stroke length of engine[m]. Write the answer with 3 decimal places and do not add the unit.

A 4-cylinder four stroke petrol engine develops 18.5 kW at 1500 r.p.m. The mean effective pressure is 5.5 bar. Calculate the stroke (in mm) the engine cylinder, if the length of stroke is 1.5 times the bore. [Write the answer with two decimal places but do not write the unit]

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