EGEE 102 – Exam 2 – Energy and Environmental Engineering – study
material
Placing your clothes dryer in a cold basement will make the dryer... - ANS
✔✔less efficient
On-demand water heaters have a storage tank. - ANS ✔✔false, On-demand
water heaters are in-line heaters and don't have a storage tank.
A family of four, each showering for five minutes a day, uses 700 gallons of water
every week. Installing a low-flow non-aerating showerhead can cut this
consumption by how much? - ANS ✔✔0.5 ,
Using a low flow non-aerating showerhead can cut water consumption by about
50%.
An old refrigerator consumes 212 W of power. Assuming that the refrigerator
operates for 18 hours every day, what is the annual operating cost of the
refrigerator, if the cost of electricity is $0.09 per kWh? - ANS ✔✔125.36
Annual operating cost = 212/1000 x 18 x 0.09 x 365 = $125.355
Insulating hot water pipes reduces the energy consumption for water heating. -
ANS ✔✔true
112 gal of water is heated in a heater from 55oF to 136oF everyday by a family.
What is the annual energy requirement of the water heater? - ANS
✔✔27483624 BTUs
1 gal of water weighs 8.3 lbs Annual Energy requirement = 112 x 8.3 x (136-55) x
365 = 27483624 BTUs
,For energy-efficient operation of a dishwasher.... - ANS ✔✔all of the above
For energy-efficient operation of a dishwasher 1. wash only full loads 2. use the
no-heat air dry feature 3. don't pre-rinse dishes before putting them in the
dishwasher
All major home appliances have an... - ANS ✔✔Energy Guide label
Buying an expensive energy efficient water heater will most likely save _____ in
the long-term. - ANS ✔✔Both money and energy
The Energy Guide labels must specify the _____ of the particular model - ANS
✔✔Estimated annual energy consumption
What kind of label do highly energy efficient appliances have? - ANS ✔✔Energy
Star label
On demand water heaters have large storage tanks. - ANS ✔✔false,
On-demand water heaters are in-line heaters and don't have a storage tank.
You can save up to 1/3 of your dishwasher operating costs by allowing the dishes
to air dry rather than go through the dry cycle. - ANS ✔✔true
An old refrigerator consumes 210 W of power. Assuming that the refrigerator
operates for 19 hours everyday, what is the annual operating cost of the
refrigerator, if the cost of electricity is $0.06 per kWh? - ANS ✔✔87.38
Annual operating cost = 210/1000 x 19 x 0.06 x 365 = $87.381
, Water heaters are typically set to... - ANS ✔✔120 degrees F
155 gal of water is heated in a heater from 63oF to 123oF everyday by a family.
What is the annual energy requirement of the water heater? - ANS
✔✔28174350 Btus
1 gal of water weighs 8.3 lbs Annual Energy requirement = 155 x 8.3 x (123-63) x
365 = 28174350 BTUs
Water heaters consume energy... - ANS ✔✔irrespective of whether we use hot
water or not
Natural gas water heaters are cheaper to install than electric water heaters. - ANS
✔✔false,
nat gas water heaters cost more to install than electric water heater
Thermosiphon systems are most efficient in areas with _____ levels of solar
radiation. - ANS ✔✔high
What kind of washer is most efficient? - ANS ✔✔front loading
Insulating the cold water pipes will save a lot of energy - ANS ✔✔false,
Insulating the hot water pipes will save a lot of energy, by reducing the heat lost
to the surroundings.
material
Placing your clothes dryer in a cold basement will make the dryer... - ANS
✔✔less efficient
On-demand water heaters have a storage tank. - ANS ✔✔false, On-demand
water heaters are in-line heaters and don't have a storage tank.
A family of four, each showering for five minutes a day, uses 700 gallons of water
every week. Installing a low-flow non-aerating showerhead can cut this
consumption by how much? - ANS ✔✔0.5 ,
Using a low flow non-aerating showerhead can cut water consumption by about
50%.
An old refrigerator consumes 212 W of power. Assuming that the refrigerator
operates for 18 hours every day, what is the annual operating cost of the
refrigerator, if the cost of electricity is $0.09 per kWh? - ANS ✔✔125.36
Annual operating cost = 212/1000 x 18 x 0.09 x 365 = $125.355
Insulating hot water pipes reduces the energy consumption for water heating. -
ANS ✔✔true
112 gal of water is heated in a heater from 55oF to 136oF everyday by a family.
What is the annual energy requirement of the water heater? - ANS
✔✔27483624 BTUs
1 gal of water weighs 8.3 lbs Annual Energy requirement = 112 x 8.3 x (136-55) x
365 = 27483624 BTUs
,For energy-efficient operation of a dishwasher.... - ANS ✔✔all of the above
For energy-efficient operation of a dishwasher 1. wash only full loads 2. use the
no-heat air dry feature 3. don't pre-rinse dishes before putting them in the
dishwasher
All major home appliances have an... - ANS ✔✔Energy Guide label
Buying an expensive energy efficient water heater will most likely save _____ in
the long-term. - ANS ✔✔Both money and energy
The Energy Guide labels must specify the _____ of the particular model - ANS
✔✔Estimated annual energy consumption
What kind of label do highly energy efficient appliances have? - ANS ✔✔Energy
Star label
On demand water heaters have large storage tanks. - ANS ✔✔false,
On-demand water heaters are in-line heaters and don't have a storage tank.
You can save up to 1/3 of your dishwasher operating costs by allowing the dishes
to air dry rather than go through the dry cycle. - ANS ✔✔true
An old refrigerator consumes 210 W of power. Assuming that the refrigerator
operates for 19 hours everyday, what is the annual operating cost of the
refrigerator, if the cost of electricity is $0.06 per kWh? - ANS ✔✔87.38
Annual operating cost = 210/1000 x 19 x 0.06 x 365 = $87.381
, Water heaters are typically set to... - ANS ✔✔120 degrees F
155 gal of water is heated in a heater from 63oF to 123oF everyday by a family.
What is the annual energy requirement of the water heater? - ANS
✔✔28174350 Btus
1 gal of water weighs 8.3 lbs Annual Energy requirement = 155 x 8.3 x (123-63) x
365 = 28174350 BTUs
Water heaters consume energy... - ANS ✔✔irrespective of whether we use hot
water or not
Natural gas water heaters are cheaper to install than electric water heaters. - ANS
✔✔false,
nat gas water heaters cost more to install than electric water heater
Thermosiphon systems are most efficient in areas with _____ levels of solar
radiation. - ANS ✔✔high
What kind of washer is most efficient? - ANS ✔✔front loading
Insulating the cold water pipes will save a lot of energy - ANS ✔✔false,
Insulating the hot water pipes will save a lot of energy, by reducing the heat lost
to the surroundings.
