EIN 4321
Spring 2005
Assignment #2
Due: January 26,2406
Review material covered in the class notes.
l. A 219,000 sq. Ft. Facility that makes air-conditioning components used 2.1 million kWh last
yem at a cost of $0.0451kWh, includingta>(es. They also used 7,000 gallons of LP gas at a
cost of $O.42ltherm, including taxes. Determine:
a. Total electrical energy expense
b. Total LP Gas energy expense
c. ECI
d. EUI
2. Perform the followin$ calculations:
a. 5,000 gallons #2 fuel oil to Btus
b. 1,257 gallons liquid propaire gas to MMBtus
g. 2,458,478 kWhto MMBtus
d: 2,145,513 kwh to therms of natural gas
e. 16 Barrels of crude oil to kWh
, f. 150 tons of coal to kWh
3. Inland Containers, a cardboard manufacturing facility uses 4,750 kgal of water annually for
glue on their comrgated cardboard products.
a. How many Btus are required to heat the water from 75oF to 140"F?
b. They are using an 85% efficiency gas heater and natural gas can be purchased for
$O.45ltherm. What is the annual cost to run the heater?
c: The operations manager is considering purchasing an electric water heater. Inland
Containers currently pays $0.04/kwh. Should they purchase the electric heater or stay w/
the gas heater? Show justification.
d. At what cost per kWh do these two opJibls become equally attractive?
I
4'. A train is carrying 400 tons of coal. If iach ton of coal will generate 2,A00 kWh of electrical
energy, how many kWh can-be generated from the entire load of coal?
5. The Power Plant at Florida's Natural Orange Juice facility is rated at 4 MW and has a heat
rate of 8,500 Btu/kWh.
a. What is the annual coal consumption?
' b. How many kWh are produced daily? Annually? (assume 365 days/yr.)
c. What is the overall efficiency of the power plant?
[Read: How many kWh are produced per Btu?]
d. If 70'F water is used to tecover waste heat and produce 105'F "hot" water for residential
customers. On any given day, how mdny gallons of "hot" water will be produced?
