EMP Sustainable Practices & Conservation 3

Question 1

A chiller's coefficient of performance (COP) is 4.5. What does this mean?

Accepted Answer

For every 1 kW of electrical input, 4.5 kW of cooling is produced

Answer

COP is the ratio of useful cooling output to electrical energy input; a COP of 4.5 means 4.5 units of cooling per unit of electricity consumed.

Question 2

Which renewable energy certificate (REC) policy mechanism requires utilities to obtain a specified percentage of power from renewable sources?

Accepted Answer

Renewable Portfolio Standard (RPS)

Answer

A Renewable Portfolio Standard mandates that a percentage of a utility's electricity supply come from eligible renewable energy sources.

Question 3

Which heat recovery technology extracts energy from exhaust air to pre-condition incoming fresh air in an HVAC system?

Accepted Answer

Energy recovery ventilator (ERV)

Answer

An ERV transfers both sensible heat and latent moisture between exhaust and supply airstreams, reducing conditioning energy.

Question 4

A facility's monthly electric bill shows a 35% demand charge based on peak 15-minute interval. Which strategy BEST reduces this charge?

Accepted Answer

Staggering start times of large loads to flatten demand peaks

Answer

Staggering large load starts reduces the coincident peak demand during the billing period, directly lowering demand charges.

Question 5

What is the primary environmental benefit of using low-global-warming-potential (low-GWP) refrigerants in HVAC systems?

Accepted Answer

Reduced contribution to climate change from refrigerant leaks

Answer

Low-GWP refrigerants minimize climate impact when refrigerant leaks occur, since their warming potential is far less than legacy HFCs.

(EMP) Energy Management Professional Practice Test