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Construction Data Centers: Facility & Infrastructure Terms Glossary
A free, platform-curated glossary of the power, cooling, and reliability terms used in data center construction and operations. Definitions follow public-domain Uptime Institute, ASHRAE, and Green Grid usage so engineers, owners, and operators describe facility infrastructure with one precise vocabulary.
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{
"term": "Power Usage Effectiveness (PUE)",
"category": "efficiency metric",
"reference": "The Green Grid",
"definition": "Ratio of total facility power to IT equipment power"
},
{
"term": "Data Center Infrastructure Efficiency (DCiE)",
"category": "efficiency metric",
"reference": "The Green Grid",
"definition": "Percentage of total power delivered to IT load"
},
{
"term": "Rack unit (U)",
"category": "unit",
"reference": "EIA-310",
"definition": "1.75-inch vertical increment for mounting equipment"
},
{
"term": "Hot aisle / cold aisle",
"category": "cooling",
"reference": "ASHRAE TC 9.9",
"definition": "Rack layout that separates intake and exhaust airflow"
},
{
"term": "Computer room air conditioner (CRAC)",
"category": "cooling equipment",
"reference": "industry standard",
"definition": "Direct-expansion unit that cools computer room air"
},
{
"term": "Computer room air handler (CRAH)",
"category": "cooling equipment",
"reference": "industry standard",
"definition": "Chilled-water unit that conditions computer room air"
},
{
"term": "N+1 redundancy",
"category": "reliability",
"reference": "Uptime Institute",
"definition": "One spare component beyond the minimum required"
},
{
"term": "2N redundancy",
"category": "reliability",
"reference": "Uptime Institute",
"definition": "Fully duplicated, independent system capacity"
},
{
"term": "Uninterruptible power supply (UPS)",
"category": "power",
"reference": "IEC",
"definition": "Battery-backed system bridging power during outages"
},
{
"term": "Raised floor",
"category": "infrastructure",
"reference": "TIA-942",
"definition": "Elevated floor system for cabling and air distribution"
},
{
"term": "Uptime tier",
"category": "classification",
"reference": "Uptime Institute",
"definition": "Classification of facility reliability from I to IV"
},
{
"term": "Water Usage Effectiveness (WUE)",
"category": "efficiency metric",
"reference": "The Green Grid",
"definition": "Water consumed per unit of IT energy"
},
{
"term": "Free cooling",
"category": "cooling",
"reference": "ASHRAE",
"definition": "Using outside air or water to cool without mechanical refrigeration"
}
],
"sources": [
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"url": "https://www.thegreengrid.org/",
"name": "The Green Grid metrics library"
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"url": "https://uptimeinstitute.com/",
"name": "Uptime Institute glossary"
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"term": "Data center term",
"category": "Type of concept",
"reference": "Where the term is standardized",
"definition": "Plain-language meaning"
},
"buyer_use_cases": [
"Align design and operations teams on facility terminology",
"Interpret efficiency and reliability metrics in a design brief",
"Onboard new engineers to data center infrastructure concepts"
]
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