A boiler produces steam at a saturated temperature of 300C and at dryness of 92% from...

A boiler produces steam at a saturated temperature of 300C and at dryness of 92% from feedwater at 110C The boiler evaporating rate is 70 kg min. What is boiler heat rate ?

The density of steam at pressure 1.100 kPa is ?

Expert Solution

Density of saturated steam at 1.1 kPa = 0.009524 kg/m^3. (Sorry I read it as 1100 kPa and wrote the answer at first). But this is also a property of steam got from the saturated steam property chart. Dont know why it is asked and what is its relevance to the question. If they are asking to calculate the density of the steam at 1.1 kPa that was generated from boiler at t=300 C and x=0.92, then they must mention the process the steam undergoes to reach the pressure of 1.1 kPa. Density at boiler exit can be easily calculated as v' and v'' are already known from property plots and written above also. from there calculate v2=v'+x2*(v''-v'). And density at 2 would be rho_2=1/v2. But this is not asked in the question. In case they give the type of process like polytropic process, etc then calculate this and go ahead. But as per the question asked the solution given is complete !!

samet mamat answered 2 years ago

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