To reduce the global emission of greenhouse gases, which of the following would be theMOST effective and practical lifestyle cha
1 answer:
You might be interested in
Answer:
net boiler heat = 301.94 kW
Explanation:
given data
saturated steam = 6.0 bars
temperature = 18°C
flow rate = 115 m³/h = 0.03194 m³/s
heat use by boiler = 90 %
to find out
rate of heat does the boiler output
solution
we can say saturated steam is produce at 6 bar from liquid water 18°C
we know at 6 bar from steam table
hg = 2756 kJ/kg
and
enthalpy of water at 18°C
hf = 75.64 kJ/kg
so heat required for 1 kg is
=hg - hf
= 2680.36 kJ/kg
and
from steam table specific volume of saturated steam at 6 bar is 0.315 m³/kg
so here mass flow rate is
mass flow rate =
mass flow rate m = 0.10139 kg/s
so heat required is
H = h × m
here h is heat required and m is mass flow rate
H = 2680.36 × 0.10139
H = 271.75 kJ/s = 271.75 kW
now 90 % of boiler heat is used for generate saturated stream
so net boiler heat =
net boiler heat =
net boiler heat = 301.94 kW
Answer:
KE= 687.21 BTU
Explanation:
Given that
Mass of car = 2500 lbm
We know that 1 lb=0.45 kg
So the mass of car m =1133.98 kg
Velocity of car= 80 mph
We know that 1 mph =0.44 m/s
So velocity of car = 35.76 m/s
As we know that kinetic energy (KE) is given as follows
Now by putting the values
KE=725.05 KJ
We know that 1 KJ = 0.94 BTU
So KE= 687.21 BTU