EMP Energy Audits 3

Question 1

An energy auditor discovers a facility's compressed air system operates at 120 psi but most end uses only require 90 psi. The BEST recommendation is to:

Accepted Answer

Reduce system pressure to the minimum required level

Answer

Reducing compressed air pressure by 2 psi saves approximately 1% in compressor energy, so dropping from 120 to 90 psi can yield roughly 15% savings.

Question 2

In the context of energy audits, what does 'demand charge' refer to on a utility bill?

Accepted Answer

A fee based on the highest rate of power draw during the billing period

Answer

Demand charges are based on the peak power demand (kW) during a billing period, often the highest 15- or 30-minute average, and can represent 30–70% of a commercial electricity bill.

Question 3

Which heat transfer mechanism is responsible for the majority of heat loss through a well-insulated opaque wall assembly?

Accepted Answer

Conduction through the solid materials

Answer

In a well-insulated opaque wall, conduction through the solid materials (studs, insulation, sheathing) is the dominant heat transfer mechanism.

Question 4

A facility manager wants to evaluate the thermal performance of a roof during an energy audit. Which diagnostic tool provides a non-destructive assessment of insulation defects and moisture intrusion?

Accepted Answer

Infrared thermography

Answer

Infrared thermography detects temperature differences on roof surfaces that indicate missing insulation, thermal bridging, or moisture-saturated insulation without destructive testing.

Question 5

When auditing a steam distribution system, auditors should pay particular attention to steam traps because failed-open traps result in:

Accepted Answer

Continuous steam blowthrough, wasting significant boiler energy

Answer

A steam trap failed open allows live steam to pass continuously into the condensate return, bypassing useful heat delivery and wasting substantial boiler fuel.

(EMP) Energy Management Professional Practice Test

(EMP) Energy Management Professional Practice Test

EMP Energy Audits 3