Answer:
By how it impacts our goals and the environment probably. Sorry if i'm wrong :(
Answer:
mechanical power used to overcome frictional effects in piping is 2.37 hp
Explanation:
given data
efficient pump = 80%
power input = 20 hp
rate = 1.5 ft³/s
free surface = 80 ft
solution
we use mechanical pumping power delivered to water is
.............1
put here value
= (0.80)(20)
= 16 hp
and
now we get change in the total mechanical energy of water is equal to the change in its potential energy
..............2
and that can be express as
..................3
so
......4
solve it we get
hp
so here
due to frictional effects, mechanical power lost in piping
we get here
put here value
= 16 -13.614
= 2.37 hp
so mechanical power used to overcome frictional effects in piping is 2.37 hp
Answer:
Energy Transfer = 350 kJ
Explanation:
The net work can be determined from an energy balance. That is, with assumption
∆KE + ∆PE + ∆U = Q − W
Where
∆KE = ∆PE = 0 (Since There is no significant change in the kinetic or potential energy of the steam)
The net work is the sum of the work associated with the paddlewheel Wpw
and the work done on the piston Wpiston:
W = Wpw + Wpiston
From the given information, Wpw= −18.5 kJ,
Collecting results:
Wpw + Wpiston = Q − ∆U
Wpiston = Q − ∆U − Wpw= Q − m (u2− u1) − Wpw
Where Q=80kJ, m=5kg, u2 = 2659.6 kJ/kg, u1 = 2709.9 kJ/kg
= 80 kJ − 5 kg (2659.6 − 2709.9)kJ/kg − ( −18. 5 kJ)
= 350 kJ