EMP Energy Efficiency & Conservation Techniques 3

Question 1

Which building envelope measure provides the greatest energy benefit in a climate with both hot summers and cold winters?

Accepted Answer

Installing low-emissivity (low-e) window glazing

Answer

Low-e coatings reduce both solar heat gain in summer and radiant heat loss in winter, benefiting mixed climates year-round.

Question 2

A process heating system uses natural gas. The energy manager proposes heat recovery from exhaust gases. What device is typically installed for this purpose?

Accepted Answer

Recuperator or regenerator heat exchanger

Answer

Recuperators and regenerators transfer heat from hot exhaust gases to incoming combustion air, improving furnace efficiency.

Question 3

According to DOE guidelines, what is the recommended setpoint range for server room cooling to maximize energy efficiency without risking equipment damage?

Accepted Answer

80–95°F (27–35°C)

Answer

ASHRAE A1 class equipment allows inlet temperatures up to 80.6°F (27°C), and raising setpoints toward this range cuts cooling energy significantly.

Question 4

What is the primary advantage of a ground-source heat pump (GSHP) over an air-source heat pump in cold climates?

Accepted Answer

Access to a more stable heat source that remains above freezing

Answer

Ground temperatures remain relatively constant year-round, allowing GSHPs to maintain high efficiency even when outdoor air temperatures are very low.

Question 5

An energy manager calculates the 'simple payback period' for an efficiency upgrade. Which formula is correct?

Accepted Answer

Project Cost ÷ Annual Energy Cost Savings

Answer

Simple payback period equals the initial investment divided by the annual cost savings, expressed in years.

(EMP) Energy Management Professional Practice Test

(EMP) Energy Management Professional Practice Test

EMP Energy Efficiency & Conservation Techniques 3