Consider the tube and inlet conditions of Problem 1.36.Heat transfer at a rate of q = 3.98 MW is delivered tothe tube. For an exit pressure of p = 8 bar , determine(a) the temperature of the water at the outlet as well asthe change in (b) combined thermal and flow work.(c) mechanical energy, and (d) total energy of the watertroll) the inlet to the outlet of the tube. Hint : As a firstestimate, neglect the change in mechanical energy insolving part (a). Relevant properties may be obtained from a thermodynamics text.
Consider the tube and inlet conditions of Problem 1.36.Heat transfer at a rate of
q
=
3.98
MW
is delivered tothe tube. For an exit pressure of
p
=
8
bar
, determine(a) the temperature of the water at the outlet as well asthe change in (b) combined thermal and flow work.(c) mechanical energy, and (d) total energy of the watertroll) the inlet to the outlet of the tube. Hint: As a firstestimate, neglect the change in mechanical energy insolving part (a). Relevant properties may be obtained from a thermodynamics text.
Science that deals with the amount of energy transferred from one equilibrium state to another equilibrium state.
Steam generators are a type of heat exchanges that are used inpower plants to generate steam at desired pressure andtemperature (Fig. Q1.b). In a steam generator, saturated liquidwater at 30°C enters a 60-mm diameter tube at the volume flowrate of 12 L/s. After exchanging heat with hot gas, the waterchanges to steam and leaves the generator at a pressure of 9 MPaand a temperature of 400°C. During this process, the diameter ofthe water/steam tube does not change.
Where necessary, assume air as an ideal gas and consider R = 287J/(kg.K), Cp = 1005 J/(kg.K), Cv = 718 J/(kg.K).
(i) Calculate the steam mass flow rate and inlet velocity of the steam?
(ii) What is the exit velocity of the steam?
(iii) Calculate the rate of heat transfer (in MW) required tochange the phase of liquid water to steam.
A7
To a 5ft long ½” ID pipe that is maintained at a uniform temperature of 150ºF oil enters at 70ºF with an average speed of 2ft/s. Determine the temperature rise on leaving the tube. The properties of the fluid can be taken as:=0.015lb/ft.s at 70ºF, =0.0055lb/ft.s at 150ºF, ρ=55lb/ft3, Cp=0.45 BTU/lb.ºF,k=0.1 BTU/h.ft.ºF.
Steam generators are a type of heat exchanges that are used in power plants to generate steam at desired pressure and temperature (Fig. Q1.b). In a steam generator, saturated liquid water at 30°C enters a 60-mm diameter tube at the volume flow rate of 12 L/s. After exchanging heat with hot gas, the water changes to steam and leaves the generator at a pressure of 9 MPa and a temperature of 400°C. During this process, the diameter of the water/steam tube does not change.(iv) Calculate the rate of heat transfer (in MW) required tochange the phase of liquid water to steam.
Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
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