TEST BANK FOR Energy Management 7th Edition International Version By Klaus Dieter E. Pawlik

4 Solutions Manual for Guide to Energy Management, International Version
Problem: Perform the following energy conversions and calculations:
a) A spherical balloon with a diameter of three meters is
filled with natural gas. How much energy is contained
in that quantity of natural gas?
b) How many Joules are in 550 cubic metres of natural
gas? How many GJ in 2,000 litres of #2 fuel oil?
c) An oil tanker is carrying 3,000 litres of #2 fuel oil. If
each litre of fuel oil will generate 3.3 kWh of electric
energy in a power plant, how many kWh can be generated
from the oil in the tanker?
d) How much hard coal is required at a power plant with
a heat rate of 10 MJ/kWh to run a 6 kW electric resistance
heater constantly for 1 week (168 hours)? (One
tonne of hard coal conttains 25 GJ of heat.)
e) A large city has a population which is served by a
single electric utility which burns hard coal to generate
electrical energy. If there are 500,000 utility customers
using an average of 12,000 kWh per year, how many
tonnes of coal must be burned in the power plants if
the heat rate is 10.5 MJ/kWh? (One tonne of hard coal
contains 25 GJ of heat.)
f) Consider an electric heater with a 4,500 watt heating
element. Assuming that the water heater is 98% efficient,
how long will it take to heat 200 litres of water
from 20 degrees C to 60 degrees C?