Helsinki's underground master plan
http://www.cnn.com/video/data/2.0/video/world/2011/02/14/qmb.fc.helsinki.underground.cnn.html
Data Center Site: How Deep Can You Go? Efforts to retrofit subterranean bunkers into functional data center space have been underway for years. But as power requirements and security considerations have intensified, selecting underground sites that are specifically designed from day one to house mission critical infrastructure is a new trend. Ultra-secure underground data center space is being fueled by projected energy, security and regulatory benefits relative to above ground alternatives.
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Underground Secure Data Center Operations
Technology based companies are building new data centers in old mines, caves, and bunkers to host computer equipment below the Earth's surface.
Underground Secure Data Center Operations have a upward trend.
Operations launched in inactive gypsum mines, caves, old abandoned coal mines, abandoned solid limestone mines, positioned deep below the bedrock mines, abandoned hydrogen bomb nuclear bunkers, bunkers deep underground and secure from disasters, both natural and man-made.
The facility have advantages over traditional data centers, such as increased security, lower cost, scalability and ideal environmental conditions. There economic model works, despite the proliferation of data center providers, thanks largely to the natural qualities inherent in the Underground Data Centers.
With 10,000, to to over a 1,000,000 square feet available, there is lots of space to be subdivided to accommodate the growth needs of clients. In addition, the Underground Data Centers has an unlimited supply of naturally cool, 50-degree air, providing the ideal temperature and humidity for computer equipment with minimal HVAC cost.
They are the most secure data centers in the world and unparalleled in terms of square footage, scalability and environmental control.
Yet, while the physical and cost benefits of being underground make them attractive, they have to also invested heavily in high-speed connectivity and redundant power and fiber systems to ensure there operations are not just secure, but also state-of-the-art.
There initially focused on providing disaster recovery solutions, and backup co-location services.
Clients lease space for their own servers, while other provides secure facilities, power and bandwidth. They offers redundant power sources and multiple high-speed Internet connections through OC connected to SONET ring linked to outside connectivity providers through redundant fiber cables.
Underground Data Centers company augments there core services to include disaster recovery solutions, call centers, NOC, wireless connectivity and more.
Strategic partnering with international, and national information technology company, enable them to offer technology solutions ranging from system design and implementation to the sale of software and equipment.
The natural qualities of the Underground Data Centers allow them to offer the best of both worlds premier services and security at highly competitive rates.
Underground Data Centers were established starting in 1990's but really came into there own after September 11 attacks in 2001 when there founders realized the former mines, and bunker offered optimal conditions for a data center. The mines, and bunkers offered superior environmental conditions for electronic equipment, almost invulnerable security and they located near power grids.
Adam Couture, a Mass.-based analyst for Gartner Inc. said Underground Data Centers could find a niche serving businesses that want to reduce vulnerability to any future attacks. Some Underground Data Centers fact sheet said that the Underground Data Center would protect the data center from a cruise missile explosion or plane crash.
Every company after September 11 attacks in 2001 are all going back and re-evaluating their business-continuity plans, This doesn't say everybody's changing them, but everybody's going back and revisiting them in the wake of what happened and the Underground Data Center may be just that.
Technology based companies are building new data centers in old mines, caves, and bunkers to host computer equipment below the Earth's surface.
Underground Secure Data Center Operations have a upward trend.
Operations launched in inactive gypsum mines, caves, old abandoned coal mines, abandoned solid limestone mines, positioned deep below the bedrock mines, abandoned hydrogen bomb nuclear bunkers, bunkers deep underground and secure from disasters, both natural and man-made.
The facility have advantages over traditional data centers, such as increased security, lower cost, scalability and ideal environmental conditions. There economic model works, despite the proliferation of data center providers, thanks largely to the natural qualities inherent in the Underground Data Centers.
With 10,000, to to over a 1,000,000 square feet available, there is lots of space to be subdivided to accommodate the growth needs of clients. In addition, the Underground Data Centers has an unlimited supply of naturally cool, 50-degree air, providing the ideal temperature and humidity for computer equipment with minimal HVAC cost.
They are the most secure data centers in the world and unparalleled in terms of square footage, scalability and environmental control.
Yet, while the physical and cost benefits of being underground make them attractive, they have to also invested heavily in high-speed connectivity and redundant power and fiber systems to ensure there operations are not just secure, but also state-of-the-art.
There initially focused on providing disaster recovery solutions, and backup co-location services.
Clients lease space for their own servers, while other provides secure facilities, power and bandwidth. They offers redundant power sources and multiple high-speed Internet connections through OC connected to SONET ring linked to outside connectivity providers through redundant fiber cables.
Underground Data Centers company augments there core services to include disaster recovery solutions, call centers, NOC, wireless connectivity and more.
Strategic partnering with international, and national information technology company, enable them to offer technology solutions ranging from system design and implementation to the sale of software and equipment.
The natural qualities of the Underground Data Centers allow them to offer the best of both worlds premier services and security at highly competitive rates.
Underground Data Centers were established starting in 1990's but really came into there own after September 11 attacks in 2001 when there founders realized the former mines, and bunker offered optimal conditions for a data center. The mines, and bunkers offered superior environmental conditions for electronic equipment, almost invulnerable security and they located near power grids.
Adam Couture, a Mass.-based analyst for Gartner Inc. said Underground Data Centers could find a niche serving businesses that want to reduce vulnerability to any future attacks. Some Underground Data Centers fact sheet said that the Underground Data Center would protect the data center from a cruise missile explosion or plane crash.
Every company after September 11 attacks in 2001 are all going back and re-evaluating their business-continuity plans, This doesn't say everybody's changing them, but everybody's going back and revisiting them in the wake of what happened and the Underground Data Center may be just that.
Comparison chart: Underground data centers
Five facilities compared
| Name | InfoBunker, LLC | The Bunker | Montgomery Westland | Cavern Technologies | Iron Mountain The Underground |
|---|---|---|---|---|---|
| Location | Des Moines, Iowa* | Dover, UK | Montgomery, Tex. | Lenexa, Kan. | Butler County, Penn.* |
| In business since | 2006 | 1999 | 2007 | 2007 | Opened by National Storage in 1954. Acquired by Iron Mountain 1998. |
| Security /access control | Biometric; keypad; pan, tilt and zoom cameras; door event and camera logging | CCTV, dogs, guards, fence | Gated, with access control card, biometrics and a 24x7 security guard | Security guard, biometric scan, smart card access and motion detection alarms | 24-hour armed guards, visitor escorts, magnetometer, x-ray scanner, closed-circuit television, badge access and other physical and electronic measures for securing the mine's perimeter and vaults |
| Distance underground (feet) | 50 | 100 | 60 | 125 | 220 |
| Ceiling height in data center space (feet) | 16 | 12 to 50 | 10 | 16 to 18 | 15 (10 feet from raised floor to dropped ceiling) |
| Original use | Military communications bunker | Royal Air Force military bunker | Private bunker designed to survive a nuclear attack. Complex built in 1982 by Louis Kung (Nephew of Madam Chang Kai Shek) as a residence and headquarters for his oil company, including a secret, 40,000 square foot nuclear fallout shelter. The office building uses bulletproof glass on the first floor and reception area and 3-inch concrete walls with fold-down steel gun ports to protect the bunker 60 feet below. | Limestone mine originally developed by an asphalt company that used the materials in road pavement | Limestone mine |
| Total data center space (square feet) | 34,000 | 50,000 | 28,000 plus 90,000 of office space in a hardened, above-ground building. | 40,000 | 60,000 |
| Total space in facility | 65,000 | 60,000 | 28,000 | 3 million | 145 acres developed; 1,000 acres total |
| Data center clients include | Insurance company, telephone company, teaching hospital, financial services, e-commerce, security monitoring/surveillance, veterinary, county government | Banking, mission critical Web applications, online trading | NASA/T-Systems, Aker Solutions, Continental Airlines, Houston Chronicle, Express Jet | Healthcare, insurance, universities, technology, manufacturing, professional services | Marriott International Inc., Iron Mountain, three U.S. government agencies |
| Number of hosted primary or backup data centers | 2 | 50+ | 13 | 26 | 5 |
| Services offered | Leased data center space, disaster recovery space, wholesale bandwidth | Fully managed platforms, partly managed platforms, co-location | Disaster recovery/business continuity, co-location and managed services | Data center space leasing, design, construction and management | Data center leasing, design, construction and maintenance services |
| Distance from nearest large city | Des Moines, about 45 miles* | Canterbury, 10 miles; London, 60 miles | Houston, 40 miles | Kansas City, 15 miles | Pittsburgh, 55 miles |
| Location of cooling system, includng cooling towers | Underground | Underground | Above and below ground. All cooling towers above ground in secure facility. | Air cooled systems located underground. Cooling towers located outside | Chillers located above ground to take advantage of "free cooling." Pumps located underground. |
| Location of generators and fuel tanks | Underground | Above ground and below ground | Two below ground, four above ground. All fuel tanks buried topside. | Underground | Underground |
*Declined to cite exact location/disatance for security reasons.
About Me
- Gary E. Weller
- The Editor: My Name is Gary E.Weller; this is what I am thinking about in the time and space when I am writing this newsletter, you will never know what to expect from my mind or others. When I let my hair grow long some folk say I look like Albert Einstein what a compliment, I will try to keep my hair as long as I can. I prefer to Die on my feet than Live on my knees!"
List of Underground Data Centers (click on name)
- Cavern Technologies
- CyberBunker
- DEAC Ltd
- Geek With A Box
- Green Mountain Data Centre
- InfoBunker, LLC
- Iron Mountain
- Montgomery Westland
- Pionen Bahnhof
- Prairie Bunkers
- Smartbunker
- StrataSpace, LLC
- Swiss Fort Knox
- The Bunker
- The Mountain Complex
- The Mountain Datacenter
- US Secure Hosting Center
- another9 L.L.C.
Glossary of Data Center Terms
AC - Alternating current
ACAE - Air conditioning airflow efficiency, the amount of heat removed per standard cubic foot of airflow per minute
AHU - Air handling unit
Air Mixing - The unintended mixing of cold and hot air
Airside Economizer - An economizer that directs exterior air into the data center when the air temperature is at or below the cooling set point
Aisle - The open space between rows of racks. Best-practice dictates racks should be arranged with consistent orientation of front and back to create ‘cold'and ‘hot'aisles.
AMS - Asset management system
ASHRAE - American Society of Heating, Refrigerating and Air-Conditioning Engineers is an international technical society organized to advance the arts and sciences of air management.
BACnet - A data communication protocol for building automation and control networks
BAS - Building automation system
Blanking Panel - A device mounted in unused U spaces in a rack that restricts bypass airflow, also called blanking or filler plates
BMS - Building management system, synonymous with BAS, AMS and other computer-based tools used to manage data center assets
BTU - British thermal until, a standard measure of cooling equipment capacity
Bypass Airflow - Conditioned air that does not reach computer equipment, escaping through cable cut-outs, holes under cabinets, misplaced perforated tiles or holes in the computer room perimeter walls.
C - Degrees Celsius
C/H - Cooling/Heating Cabinet - Device for holding IT equipment, also called a rack
CAC - Cold aisle containment system that directs cooled air from air conditioning equipment to the inlet side of racks in a highly efficient manner
CADE - Corporate average data center efficiency
CapEx - Capital expense, the cost of purchasing capital equipment
Carbon Footprint - A measurement of the volume in pounds of Carbon Dioxide generated by business operations. CFD - Computational fluid dynamics, scientific calculations applied to airflow analysis
CFM - Cubic feet per minute, an airflow volume measurement Close-Coupled Cooling - Cooling technology that is installed adjacent to server racks and enclosed to direct airflow directly to the rack without mixing with DC air
Coefficient of Effectiveness (CoE) - Uptime Institute metric based on the Nash-Sutcliffe model efficiency coefficient Cold Aisle - An aisle where rack fronts face into the aisle. Chilled airflow is directed into this aisle so that it can then enter the fronts of the racks in a highly efficient manner.
Cold Spot - An area where ambient air temperature is below acceptable levels. Typically caused by cooling equipment capacity exceeding heat generation.
CR - Computer room
CRAC - Computer room air conditioner (pronounced crack) that uses a compressor to mechanically cool air
CRAH - Computer room air handler (pronounced craah) that uses chilled water to cool air
Critical Load - Computer equipment load delivered by PDU output
CSI - Cold supply infiltration index, quantifies the amount of hot air mixing with cold inlet air prior to entering the rack. Cutout - An open area in a raised floor that allows airflow or cable feeds
CW - Chilled water
DC - Data center
DCiE - Data center infrastructure efficiency is an efficiency measure that is calculated by dividing the IT equipment power consumption by the power consumption of the entire data center. This measure is the inverse of PUE.
Dead Band - An HVAC energy saving technique whereby sensitivity set points of equipment are set more broadly to improve coordination of the equipment and avoid offsetting behaviors, also dead band control strategy
Delta T - Delta temperature, the spread between the inlet and outlet air temperatures of air conditioning equipment, measured as the maximum achievable difference between inlet (return) and outlet (supply) temperatures. This is not the astronomical
measurement of Terrestrial Dynamical Time minus Universal Time.
Dewpoint - The temperature at which air reaches water vapor saturation, typically used when examining environmental conditions to ensure they support optimum hardware reliability
D/H - Dehumidifying/Humidifying
Dry-Bulb Temperature - The temperature of the air measured using a dry-bulb thermometer, typically taken in conjunction with a wet-bulb reading in order to determine relative humidity
EFC - Equivalent full cabinets, the number of full cabinets that would exist if all the equipment in the data center were concentrated in full cabinets
ESD - Electrostatic discharge, more commonly ‘static discharge'
F - Degrees Fahrenheit Ft2 - Square feet or foot
GPM - Gallons per minute
HAC - Hot aisle containment system that directs heated air from the outlet side of racks to air conditioning equipment return ducts in a highly efficient manner Harmonic Distortion - Multiples of power frequency superimposed on the power waveform that causes excess heating in wiring and fuses Heat Exchanger - A device used to transfer heat energy, typically used for removing heat from a chilled liquid system HDG - Hot dipped galvanized Hot Aisle - An aisle where rack backs face into the aisle. Heated exhaust air from the equipment in the racks enters this aisle and is then directed to the CRAC return vents. HPDC - High-performance data center, a data center with above average kW loading, typically greater than 10kW/rack Hot Spot - An area, typically related to a rack or set of racks, where ambient air temperature is above acceptable levels. Typically caused by heat generation in excess of cooling equipment capacity. Hp - Horsepower
Hr - Hour HVAC - Heating, ventilation and air conditioning system, the set of components used to condition interior air including heating and cooling equipment as well as ducting and related airflow devices
In-Row Cooling - Cooling technology installed between server racks in a row that delivers cooled air to equipment more efficiently Inlet Air - The air entering the referenced equipment. For air conditioning equipment this is the heated air returning to be cooled, also called return air. For racks and servers this is the cooled air entering the equipment. IP - Internet protocol, a communications technology using the internet for communications. IR - Infrared spectrum used by thermal imaging technologies
JVM - Java virtual machine, Java interpreter. Software that converts the Java intermediate language into executable machine language.
kBTU - Kilo British thermal unit, one thousand BTU, a unit of measurement for the cooling capacity of a CRAH kCFM - Kilo-cubic feet per minute, 1000 CFM kV - Kilovolt kW - Kilowatts kWc - Kilowatts of cooling, alternate unit of measurement for the cooling capacity of a CRAH kWh - Kilowatt hours kVA - Kilovolt amperes = voltage x current (amperage) KVM - Keyboard, video, mouse; an interface technology that enables users to access multiple servers remotely from one or more KVM sites. More obscurely, can also mean K Virtual Machine: a version of the Java Virtual Machine for small devices with limited memory.
Latent Cooling Capacity - Cooling capacity related to wet bulb temperature and objects that produce condensation Line Noise - Distortions superimposed on the power waveform that causes electromagnetic interference Liquid Cooling - A general term used to refer to cooling technology that uses a liquid circulation system to evacuate heat as
opposed to a condenser, most commonly used in reference to specific types of in-row or close-coupled cooling technologies Load - The kW consumption of equipment, typically installed in a rack. Also, the heat level a cooling system is required to remove from the data center environment
MAH - Makeup air handler, a larger air handler that conditions 100% outside air. Synonymous with MAU. Make-Up Air - The conditioned air delivered by a MAU or MAH MAU - Makeup air unit, a larger air handler that conditions 100% outside air. Synonymous with MAH. Maximum Temperature Rate of Change - An ASHRAE standard established to ensure stable air temperatures. The standard is 9 degrees F per hour. MERV - Minimum efficiency reporting value , ASHRAE 52.2, for air filtration measured in particulate size.
N+1 - Need plus one, a redundancy concept where capacity is configured to include planned capacity plus one additional device to enable continued operations with the failure of one system in the configuration. This presumes immediate detection and remediation of the failed unit. NEBS - Network equipment-building system design guidelines applied to telecommunications equipment No. - Number Nominal Cooling Capacity - The total cooling capacity of air conditioning equipment, includes both latent and sensible capacities. Due to humidity control in data centers, the latent capacity should be deducted from nominal capacity to determine useful capacity
OpEx - Operating expense, the ongoing expenses related to operating the data center Overcooling - A situation where air is cooled below optimum levels. Typically used in reference to rack inlet temperatures.
PDU - Power distribution unit Pole - A row of power receptacles with power supplied from a PDU Pole Position - A power receptacle on a pole Pressure Differential - The difference in pressure between two locations in the data center used to analyze air flow behaviors
PH - Phase, electrical phase 1-3 Plenum - A receiving chamber for air used to direct air flow PU - Packaged unit, an air handler designed for outdoor use. PUE - Power usage effectiveness, a measure of data center energy efficiency calculated by dividing the total data center energy consumption by the energy consumption of the IT computing equipment. This measure is the inverse of DCiE.
Rack - Device for holding IT equipment, also called a cabinet RAH - Recirculation air handler, a device that circulates air but does not cool the air Raised Floor - Metal flooring on stanchions that creates a plenum for airflow and cabling, synonymous with RMF Recirculation - Chilled airflow returning to cooling units without passing through IT equipment, also referred to as short cycling Return Air - The heated air returning to air conditioning equipment RFI - Radio frequency interference Rh - Relative humidity RMF - Raised metal floor, an alternate term for the more commonly used term ‘raised floor' ROI - Return on investment, a measure of the amount of time required to recover an investment RPM - Revolutions per minute, used to measure fan speeds RPP - Remote power panel RTU - Rooftop unit, an air handler designed for outdoor use mounted on a rooftop. A typical application of a PU.
S+S - System plus system SCFM - Standard cubic feet per minute, the volumetric flow rate of a gas corrected to standardized conditions of temperature, pressure and relative humidity Sensible Cooling Capacity - Cooling capacity related to dry bulb temperature and objects that do not produce condensation Sensitivity - An equipment setting that bounds the set point range and triggers a change in device function when exceeded. Most commonly referring to CRAC/CRAH temperature and humidity set points. Set Point - Typically used in reference to air conditioning equipment thermostat temperature and humidity settings Short Cycling - Chilled airflow returning to cooling units without passing through IT equipment, also referred to as recirculation
STS - Static transfer switch Sub-Floor - The open area underneath a raised computer floor, also called a sub-floor plenum Supply Air - The cooled airflow emitted from air conditioning equipment
TCE - Triton Coefficient of EffectivenessSM, synonymous with UCE Thermistor - A type of resistor with resistance varying according to its temperature
U - Rack mount unit, the standardized height of one unit is 1.75" UCE - Upsite Coefficient of EffectivenessSM, synonymous with TCE UPS - Uninterruptible power supply, device used to supply short-term power to computing equipment for brief outages or until an alternate power source, such as a generator, can begin supplying power.
VFD - Variable frequency drive
W - Watt(s) Waterside Economizer - An economizer that redirects water flow to an external heat exchanger when the exterior ambient air temperature is at or below a temperature required to chill water to a given set point, simultaneously shutting down the mechanical chiller equipment. Wet-Bulb Temperature - The temperature of the air measured using a wet-bulb thermometer, typically taken in conjunction with a dry-bulb reading in order to determine relative humidity Wg - Inches of water column, an approximate unit of measurement for static air pressure Work Cell - The area of a rack and the related area immediately in front of and behind the rack. Standard racks are 2 feet wide and 4 feet deep. Standard aisles are 4 feet wide, so half of that space is workspace for a given rack. This results in a standard work cell of 16 square feet. Actual work cell size varies with data center design. WPSF - Watts per square foot
ACAE - Air conditioning airflow efficiency, the amount of heat removed per standard cubic foot of airflow per minute
AHU - Air handling unit
Air Mixing - The unintended mixing of cold and hot air
Airside Economizer - An economizer that directs exterior air into the data center when the air temperature is at or below the cooling set point
Aisle - The open space between rows of racks. Best-practice dictates racks should be arranged with consistent orientation of front and back to create ‘cold'and ‘hot'aisles.
AMS - Asset management system
ASHRAE - American Society of Heating, Refrigerating and Air-Conditioning Engineers is an international technical society organized to advance the arts and sciences of air management.
BACnet - A data communication protocol for building automation and control networks
BAS - Building automation system
Blanking Panel - A device mounted in unused U spaces in a rack that restricts bypass airflow, also called blanking or filler plates
BMS - Building management system, synonymous with BAS, AMS and other computer-based tools used to manage data center assets
BTU - British thermal until, a standard measure of cooling equipment capacity
Bypass Airflow - Conditioned air that does not reach computer equipment, escaping through cable cut-outs, holes under cabinets, misplaced perforated tiles or holes in the computer room perimeter walls.
C - Degrees Celsius
C/H - Cooling/Heating Cabinet - Device for holding IT equipment, also called a rack
CAC - Cold aisle containment system that directs cooled air from air conditioning equipment to the inlet side of racks in a highly efficient manner
CADE - Corporate average data center efficiency
CapEx - Capital expense, the cost of purchasing capital equipment
Carbon Footprint - A measurement of the volume in pounds of Carbon Dioxide generated by business operations. CFD - Computational fluid dynamics, scientific calculations applied to airflow analysis
CFM - Cubic feet per minute, an airflow volume measurement Close-Coupled Cooling - Cooling technology that is installed adjacent to server racks and enclosed to direct airflow directly to the rack without mixing with DC air
Coefficient of Effectiveness (CoE) - Uptime Institute metric based on the Nash-Sutcliffe model efficiency coefficient Cold Aisle - An aisle where rack fronts face into the aisle. Chilled airflow is directed into this aisle so that it can then enter the fronts of the racks in a highly efficient manner.
Cold Spot - An area where ambient air temperature is below acceptable levels. Typically caused by cooling equipment capacity exceeding heat generation.
CR - Computer room
CRAC - Computer room air conditioner (pronounced crack) that uses a compressor to mechanically cool air
CRAH - Computer room air handler (pronounced craah) that uses chilled water to cool air
Critical Load - Computer equipment load delivered by PDU output
CSI - Cold supply infiltration index, quantifies the amount of hot air mixing with cold inlet air prior to entering the rack. Cutout - An open area in a raised floor that allows airflow or cable feeds
CW - Chilled water
DC - Data center
DCiE - Data center infrastructure efficiency is an efficiency measure that is calculated by dividing the IT equipment power consumption by the power consumption of the entire data center. This measure is the inverse of PUE.
Dead Band - An HVAC energy saving technique whereby sensitivity set points of equipment are set more broadly to improve coordination of the equipment and avoid offsetting behaviors, also dead band control strategy
Delta T - Delta temperature, the spread between the inlet and outlet air temperatures of air conditioning equipment, measured as the maximum achievable difference between inlet (return) and outlet (supply) temperatures. This is not the astronomical
measurement of Terrestrial Dynamical Time minus Universal Time.
Dewpoint - The temperature at which air reaches water vapor saturation, typically used when examining environmental conditions to ensure they support optimum hardware reliability
D/H - Dehumidifying/Humidifying
Dry-Bulb Temperature - The temperature of the air measured using a dry-bulb thermometer, typically taken in conjunction with a wet-bulb reading in order to determine relative humidity
EFC - Equivalent full cabinets, the number of full cabinets that would exist if all the equipment in the data center were concentrated in full cabinets
ESD - Electrostatic discharge, more commonly ‘static discharge'
F - Degrees Fahrenheit Ft2 - Square feet or foot
GPM - Gallons per minute
HAC - Hot aisle containment system that directs heated air from the outlet side of racks to air conditioning equipment return ducts in a highly efficient manner Harmonic Distortion - Multiples of power frequency superimposed on the power waveform that causes excess heating in wiring and fuses Heat Exchanger - A device used to transfer heat energy, typically used for removing heat from a chilled liquid system HDG - Hot dipped galvanized Hot Aisle - An aisle where rack backs face into the aisle. Heated exhaust air from the equipment in the racks enters this aisle and is then directed to the CRAC return vents. HPDC - High-performance data center, a data center with above average kW loading, typically greater than 10kW/rack Hot Spot - An area, typically related to a rack or set of racks, where ambient air temperature is above acceptable levels. Typically caused by heat generation in excess of cooling equipment capacity. Hp - Horsepower
Hr - Hour HVAC - Heating, ventilation and air conditioning system, the set of components used to condition interior air including heating and cooling equipment as well as ducting and related airflow devices
In-Row Cooling - Cooling technology installed between server racks in a row that delivers cooled air to equipment more efficiently Inlet Air - The air entering the referenced equipment. For air conditioning equipment this is the heated air returning to be cooled, also called return air. For racks and servers this is the cooled air entering the equipment. IP - Internet protocol, a communications technology using the internet for communications. IR - Infrared spectrum used by thermal imaging technologies
JVM - Java virtual machine, Java interpreter. Software that converts the Java intermediate language into executable machine language.
kBTU - Kilo British thermal unit, one thousand BTU, a unit of measurement for the cooling capacity of a CRAH kCFM - Kilo-cubic feet per minute, 1000 CFM kV - Kilovolt kW - Kilowatts kWc - Kilowatts of cooling, alternate unit of measurement for the cooling capacity of a CRAH kWh - Kilowatt hours kVA - Kilovolt amperes = voltage x current (amperage) KVM - Keyboard, video, mouse; an interface technology that enables users to access multiple servers remotely from one or more KVM sites. More obscurely, can also mean K Virtual Machine: a version of the Java Virtual Machine for small devices with limited memory.
Latent Cooling Capacity - Cooling capacity related to wet bulb temperature and objects that produce condensation Line Noise - Distortions superimposed on the power waveform that causes electromagnetic interference Liquid Cooling - A general term used to refer to cooling technology that uses a liquid circulation system to evacuate heat as
opposed to a condenser, most commonly used in reference to specific types of in-row or close-coupled cooling technologies Load - The kW consumption of equipment, typically installed in a rack. Also, the heat level a cooling system is required to remove from the data center environment
MAH - Makeup air handler, a larger air handler that conditions 100% outside air. Synonymous with MAU. Make-Up Air - The conditioned air delivered by a MAU or MAH MAU - Makeup air unit, a larger air handler that conditions 100% outside air. Synonymous with MAH. Maximum Temperature Rate of Change - An ASHRAE standard established to ensure stable air temperatures. The standard is 9 degrees F per hour. MERV - Minimum efficiency reporting value , ASHRAE 52.2, for air filtration measured in particulate size.
N+1 - Need plus one, a redundancy concept where capacity is configured to include planned capacity plus one additional device to enable continued operations with the failure of one system in the configuration. This presumes immediate detection and remediation of the failed unit. NEBS - Network equipment-building system design guidelines applied to telecommunications equipment No. - Number Nominal Cooling Capacity - The total cooling capacity of air conditioning equipment, includes both latent and sensible capacities. Due to humidity control in data centers, the latent capacity should be deducted from nominal capacity to determine useful capacity
OpEx - Operating expense, the ongoing expenses related to operating the data center Overcooling - A situation where air is cooled below optimum levels. Typically used in reference to rack inlet temperatures.
PDU - Power distribution unit Pole - A row of power receptacles with power supplied from a PDU Pole Position - A power receptacle on a pole Pressure Differential - The difference in pressure between two locations in the data center used to analyze air flow behaviors
PH - Phase, electrical phase 1-3 Plenum - A receiving chamber for air used to direct air flow PU - Packaged unit, an air handler designed for outdoor use. PUE - Power usage effectiveness, a measure of data center energy efficiency calculated by dividing the total data center energy consumption by the energy consumption of the IT computing equipment. This measure is the inverse of DCiE.
Rack - Device for holding IT equipment, also called a cabinet RAH - Recirculation air handler, a device that circulates air but does not cool the air Raised Floor - Metal flooring on stanchions that creates a plenum for airflow and cabling, synonymous with RMF Recirculation - Chilled airflow returning to cooling units without passing through IT equipment, also referred to as short cycling Return Air - The heated air returning to air conditioning equipment RFI - Radio frequency interference Rh - Relative humidity RMF - Raised metal floor, an alternate term for the more commonly used term ‘raised floor' ROI - Return on investment, a measure of the amount of time required to recover an investment RPM - Revolutions per minute, used to measure fan speeds RPP - Remote power panel RTU - Rooftop unit, an air handler designed for outdoor use mounted on a rooftop. A typical application of a PU.
S+S - System plus system SCFM - Standard cubic feet per minute, the volumetric flow rate of a gas corrected to standardized conditions of temperature, pressure and relative humidity Sensible Cooling Capacity - Cooling capacity related to dry bulb temperature and objects that do not produce condensation Sensitivity - An equipment setting that bounds the set point range and triggers a change in device function when exceeded. Most commonly referring to CRAC/CRAH temperature and humidity set points. Set Point - Typically used in reference to air conditioning equipment thermostat temperature and humidity settings Short Cycling - Chilled airflow returning to cooling units without passing through IT equipment, also referred to as recirculation
STS - Static transfer switch Sub-Floor - The open area underneath a raised computer floor, also called a sub-floor plenum Supply Air - The cooled airflow emitted from air conditioning equipment
TCE - Triton Coefficient of EffectivenessSM, synonymous with UCE Thermistor - A type of resistor with resistance varying according to its temperature
U - Rack mount unit, the standardized height of one unit is 1.75" UCE - Upsite Coefficient of EffectivenessSM, synonymous with TCE UPS - Uninterruptible power supply, device used to supply short-term power to computing equipment for brief outages or until an alternate power source, such as a generator, can begin supplying power.
VFD - Variable frequency drive
W - Watt(s) Waterside Economizer - An economizer that redirects water flow to an external heat exchanger when the exterior ambient air temperature is at or below a temperature required to chill water to a given set point, simultaneously shutting down the mechanical chiller equipment. Wet-Bulb Temperature - The temperature of the air measured using a wet-bulb thermometer, typically taken in conjunction with a dry-bulb reading in order to determine relative humidity Wg - Inches of water column, an approximate unit of measurement for static air pressure Work Cell - The area of a rack and the related area immediately in front of and behind the rack. Standard racks are 2 feet wide and 4 feet deep. Standard aisles are 4 feet wide, so half of that space is workspace for a given rack. This results in a standard work cell of 16 square feet. Actual work cell size varies with data center design. WPSF - Watts per square foot
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