Environmental Monitoring & Sustainability Flashcards

What is DCiE (Data Center infrastructure Efficiency) and how does it relate to PUE?

Answer: DCiE is the inverse of PUE expressed as a percentage, showing what fraction of power reaches IT equipment

DCiE = (1/PUE) × 100%, so a PUE of 1.5 equals DCiE of 66.7%, directly expressing the percentage of total facility power that IT equipment actually consumes.

What is the main risk associated with airside economization (using outside air for cooling) in a data center?

Answer: Introducing contaminants, uncontrolled humidity, and temperature extremes that can damage IT equipment

Airside economization brings outdoor air into the data center, risking contamination from dust, pollen, industrial pollutants, and uncontrolled humidity levels that can corrode or damage IT equipment.

In the context of data center environmental sustainability, what is 'stranded capacity'?

Answer: Cooling or power infrastructure that is provisioned and consuming energy but not supporting active IT workloads

Stranded capacity is provisioned infrastructure (power, cooling, space) that consumes energy without supporting IT workloads, representing wasted capital investment and ongoing operational expenditure.

Which standard or program provides environmental ratings for IT equipment procured for data center deployments?

Answer: EPEAT (Electronic Product Environmental Assessment Tool)

EPEAT rates electronic products on environmental criteria including energy efficiency, material content, end-of-life management, and corporate performance, guiding sustainable IT procurement decisions.

What is the recommended minimum average server utilization rate for an environmentally efficient data center?

Answer: 40-60%

Industry best practices target 40-60% average server utilization; below this, the embodied energy in hardware is poorly amortized and stranded capacity increases proportionally.

What primary environmental advantage does direct liquid cooling (DLC) offer over traditional air cooling in high-density data centers?

Answer: Significantly higher heat transfer efficiency, reducing total cooling energy and enabling greater rack densities

Water transfers heat approximately 3,500 times more efficiently than air per unit volume, enabling high-density deployments while consuming substantially less total cooling energy than equivalent air-cooled systems.

Which framework is most commonly used by large data center operators to report environmental impact to stakeholders?

Answer: GRI (Global Reporting Initiative) Standards

The GRI Standards provide a globally recognized framework for sustainability reporting, including energy, water, emissions, and waste metrics that data center operators use for transparent stakeholder disclosure.