natalie2sheffield
11.09.2019 •
Engineering
Pressurized water ( 10 bar, 110°c) enters the bottom of an 10-m-long vertical tube of diameter 63 mm at a mass flow rate of 1.5 kg/s. the tube is located inside a combustion chamber, resulting in heat transfer to the tube. superheated steam exits the top of the tube at 7 bar, 600°c. determine the change in the rate at which the following quantities enter and exit the tube: (1) the combined thermal and flow work, (2) the mechanical energy, and (3) the total energy of the water. also, (4) determine the heat transfer rate, . hint: relevant properties may be obtained from a thermodynamics text.
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Ответ:
(1)
(2)
(3)
(4) q = 4839.69 kW[/tex]
Solution:
Using Saturated water-pressure table corresponding to pressure, P = 10 bar:
At saturated temperature, Specific enthalpy of water,
At inlet:
Saturated temperature of water,
Specific volume of water,
Using super heated water table corresponding to a temperature of and at 7 bar:
At outlet:
Specific volume of water,
Specific enthalpy of water,
Now, at inlet, water's specific enthalpy is given by:
(1) Now, the change in combined thermal energy and work flow is given by:
(2) The mechanical energy can be calculated as:
velocity at inlet,
Similarly,, the velocity at the outlet,
Now, change in mechanical energy:
(3) The total energy of water is given by:
(4) The rate of heat transfer:
q =
Ответ:
A
Step-by-step explanation: