Free Certified Energy Manager: Steam, Industrial and Thermal Storage Questions and Answers

Question 1

What does enthalpy equal at 400 degrees Fahrenheit for saturated steam?

Accepted Answer

1201 Btu/lb

Answer

767 Btu/lb

Answer

825 Btu/lb

Answer

375 Btu/lb

Question 2

In general, if cooler air enters a compressor, the compressor's efficiency is:

Accepted Answer

Improved

Answer

Reduced

Answer

Neither because the efficiency is not related to intake air

Question 3

Heat recovery systems (also known as heat exchangers) are unable to lower temperatures below the hot gas's dew point.

Accepted Answer

False

Answer

True

Question 4

Storing Thermal Energy Latent heat storage is the main method for employing ice as a storage medium.

Accepted Answer

True

Answer

False

Question 5

Consider a process that consumes 10,000 MMBtu per year and is powered by a 50 percent efficient, old oil-fired boiler that burns leftover fuel oil #6. What energy savings might you expect if you upgrade to an 80% efficient natural gas-fired boiler?

Accepted Answer

7,500 MMBtu/year

Answer

12,500 MMBtu/year

Answer

20,000 MMBtu/year

Answer

None of the Above

Question 6

A manager of energy is comparing the running expenses of two boilers. One uses natural gas and has a 75% efficiency, while the other uses electricity and has a 97% efficiency. Electricity is $0.095/kWh and natural gas is $0.92/therm. Calculate the price per MMBtu for each system's water heating.

Accepted Answer

Electric: $28.7/MMBtu; Gas:$12.27/MMBtu

Answer

Cannot be determined

Answer

Electric: $28.7/MMBtu; Gas:$9.2/MMBtu

Question 7

An ESCO finds chances for energy savings in the new building's design (which has not been built yet). Which of the following M&V Approaches would be the best fit to take into account the "avoided cost" (resulting from the energy savings) inside the new structure?

Accepted Answer

IPMVP Option D

Answer

IPMVP Option C

Answer

IPMVP Option B

Answer

None of the Above