CDCP Energy Efficiency and Sustainability 2

Question 1

According to ASHRAE A2 thermal guidelines, what is the maximum recommended server inlet temperature?

Accepted Answer

35°C (95°F)

Answer

ASHRAE A2 class (the most commonly used server classification) allows inlet temperatures up to 35°C (95°F) to enable more free cooling hours and reduce mechanical cooling energy.

Question 2

What does 'free cooling' in data centers primarily refer to?

Accepted Answer

Using outdoor ambient air or water to reject heat without mechanical refrigeration

Answer

Free cooling uses outdoor ambient air or water at temperatures naturally lower than the data center to reject heat without running energy-intensive mechanical refrigeration compressors.

Question 3

What does ERE (Energy Reuse Effectiveness) measure in a data center?

Accepted Answer

Net energy consumed minus reused energy, divided by IT equipment energy

Answer

ERE measures net energy use (total facility energy minus any energy reused externally, such as waste heat exported to nearby buildings) divided by IT equipment energy.

Question 4

What is the primary efficiency benefit of implementing hot aisle/cold aisle containment?

Accepted Answer

Preventing hot exhaust and cold supply air from mixing, improving cooling efficiency

Answer

Hot aisle/cold aisle containment physically separates server exhaust from supply air, eliminating recirculation and bypassing airflow that wastes cooling capacity.

Question 5

What is Carbon Usage Effectiveness (CUE) primarily used to measure in data centers?

Accepted Answer

Total CO2 emissions caused by a data center divided by IT equipment energy consumed

Answer

CUE measures total greenhouse gas emissions (in kg CO2 equivalent) produced by data center energy consumption divided by IT equipment energy, quantifying the facility's carbon footprint.

CDCP - Certified Data Centre Professional Practice Test

CDCP - Certified Data Centre Professional Practice Test

CDCP Energy Efficiency and Sustainability 2