EGEE 102 – Exam 4 – Energy and Environmental Engineering – study
material
The circulation of air due to temperature differences in a room is called a
____________. - ANS ✔✔Convective loop
After a house is built, the easiest place to insulate a house is/are _____________.
- ANS ✔✔Attic
What is the average cost of electricity in the US? - ANS ✔✔$80/MWh
Oil is sold in a particular region at $1.10/gal and natural gas at $11.47 per MCF.
Given that the oil has a heating value of 140,000 Btus/gal and natural gas of 1
MMBtu/MCF, which fuel is cheaper to use? - ANS ✔✔Oil
HDD is used to estimate the amount of energy required for residential space
heating during a cool season. - ANS ✔✔True
What is the process in which heat is transferred through electromagnetic
radiation? - ANS ✔✔Radiation
Warm water rises in a lake and cold water descends. What is the name given to
this process? - ANS ✔✔Convection
The R-value of a composite wall is calculated by __________. - ANS ✔✔adding
the R-values of all layers
, Most of the synthetic insulation products are poor insulation materials. - ANS
✔✔False
Oil is sold in a particular region at $1.60/gal. Its heating value is 117000 BTU/gal.
What is the heating cost per MMBTU? - ANS ✔✔$13.68/MMBTU
A wall is made up of the following materials: Plasterboard (R=0.45), 3.5 inches of
fiberglass (R=3.11/inch), Plywood (R=0.94), and Wood Siding (R=0.81). This wall is
11 feet long and 8 feet high. On particular day the average outside temperature is
34 degrees F. What is the R-value that you would use to calculate the heat loss?
Recall that Heat loss = (Temp Diff * Area)/R-value (Units: BTU/h) - ANS
✔✔$13.08 F sq.ft.h/BTU
Pat has 1200 ft2 of roof in his home in Pittsburgh, PA (HDD = 6,000). He is
considering upgrading the insulation from R-16 to R-22. The estimate from the
contractor was $594. His home is heated with natural gas. Last year, the average
price he paid for natural gas was $14.1/MCF. Assuming an AFUE of 82.4%, how
long will it take Pat to recover his investment? - ANS ✔✔11.8 Years
What presented with limited space, a hydronic heating system can be installed
vertically. - ANS ✔✔False
Horizontal loop Geothermal heat pumps are used when there is less space
available - ANS ✔✔False
What kind of efficiency rating do gas and oil heating systems use? - ANS
✔✔AFUE
material
The circulation of air due to temperature differences in a room is called a
____________. - ANS ✔✔Convective loop
After a house is built, the easiest place to insulate a house is/are _____________.
- ANS ✔✔Attic
What is the average cost of electricity in the US? - ANS ✔✔$80/MWh
Oil is sold in a particular region at $1.10/gal and natural gas at $11.47 per MCF.
Given that the oil has a heating value of 140,000 Btus/gal and natural gas of 1
MMBtu/MCF, which fuel is cheaper to use? - ANS ✔✔Oil
HDD is used to estimate the amount of energy required for residential space
heating during a cool season. - ANS ✔✔True
What is the process in which heat is transferred through electromagnetic
radiation? - ANS ✔✔Radiation
Warm water rises in a lake and cold water descends. What is the name given to
this process? - ANS ✔✔Convection
The R-value of a composite wall is calculated by __________. - ANS ✔✔adding
the R-values of all layers
, Most of the synthetic insulation products are poor insulation materials. - ANS
✔✔False
Oil is sold in a particular region at $1.60/gal. Its heating value is 117000 BTU/gal.
What is the heating cost per MMBTU? - ANS ✔✔$13.68/MMBTU
A wall is made up of the following materials: Plasterboard (R=0.45), 3.5 inches of
fiberglass (R=3.11/inch), Plywood (R=0.94), and Wood Siding (R=0.81). This wall is
11 feet long and 8 feet high. On particular day the average outside temperature is
34 degrees F. What is the R-value that you would use to calculate the heat loss?
Recall that Heat loss = (Temp Diff * Area)/R-value (Units: BTU/h) - ANS
✔✔$13.08 F sq.ft.h/BTU
Pat has 1200 ft2 of roof in his home in Pittsburgh, PA (HDD = 6,000). He is
considering upgrading the insulation from R-16 to R-22. The estimate from the
contractor was $594. His home is heated with natural gas. Last year, the average
price he paid for natural gas was $14.1/MCF. Assuming an AFUE of 82.4%, how
long will it take Pat to recover his investment? - ANS ✔✔11.8 Years
What presented with limited space, a hydronic heating system can be installed
vertically. - ANS ✔✔False
Horizontal loop Geothermal heat pumps are used when there is less space
available - ANS ✔✔False
What kind of efficiency rating do gas and oil heating systems use? - ANS
✔✔AFUE
