Gravity on the moons surface is much less than on earths surface because
2 answers:
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Answer:
a. Mass flow rate through the boiler = 5.462lbm/s
b. Power produced by the turbine = 2525.8kW
c. The rate of heat supply in the boiler = 6901.42Btu/s
d. Thermal efficiency of the cycle = 34.3%
Explanation:
In order to provide a solution, we must assume that ;
- The system is operating at a steady condition
- Kinetic and potential energy changes are negligible
Now from steam tables, we calculate specific volume and enthalpy
as,
(
at
)
(
at
)
( at &
)
( &
when pressure is 2psia)
Therefore,
To calculate the mass flow rate of steam in the cycle, we use the formula
where
The power output and the rate of heat addition are calculated thus,
The thermal efficiency of the cycle can be found thus;
= 34.3%
The given question is incomplete. The complete question is as follows.
A picture window has dimensions of 1.40 m, 2.50 m and is made of glass 6.00 mm thick. On a winter day, the outside temperature is , while the inside temperature is a comfortable
.
Part A
At what rate is heat being lost through the window by conduction?
Express your answer using three significant figures.
Part B
At what rate would heat be lost through the window if you covered it with a 0.750 mm-thick layer of paper (thermal conductivity 0.0500 W/m?K)?
Express your answer using three significant figures.
Explanation:
Formula for rate of heat transferred through single thick plane of glass is as follows.
=
=
When window is covered by paper then the rate of heat transfer is as follows.
=
=
Thus, we can conclude that heat lost is .