Computational Fluid Dynamics (CFD)
A numerical analysis technique commonly used in the analysis of airflow in data centers.
Posted in:
Leave a Comment (0) →Cold Supply Infiltration Index (CSI)
Quantifies the amount of hot air mixing with cold inlet air prior to entering the rack.
Posted in:
Leave a Comment (0) →Cold Spot
An area where ambient air temperature is below desired levels. Typically caused by ineffective airflow management necessitating a temperature set point lower than that which would be required with proper airflow management.
Posted in:
Leave a Comment (0) →Cold Aisle Containment (CAC)
Cold Aisle Containment system that directs cooled air from air conditioning equipment to the inlet side of racks in a highly efficient manner.
Posted in:
Leave a Comment (0) →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.
Posted in:
Leave a Comment (0) →Coefficent of Performance (CoP)
Used to rate the effectiveness of heat pumps or cooling units. It is the ratio of the load on a cooling unit and the energy that it uses.
Posted in:
Leave a Comment (0) →Coefficent of Effectiveness (CoE)
Uptime Institute metric based on the Nash-Sutcliffe model efficiency coefficient.
Posted in:
Leave a Comment (0) →CMDB
Configuration Management DB. It is the database that contains all relevant about the systems, applications, and configuration.
Posted in:
Leave a Comment (0) →Close-Coupled Cooling
Cooling technology that is installed adjacent to server racks, minimizing the path that air must flow from the cooling unit through the IT equipment and back to the cooling unit.
Posted in:
Leave a Comment (0) →Chiller
A unit consisting of a compressor, a condensing section and an expansion section. The condensing and expansion sections nearly always have water or glycol as the heat transfer agent to the rest of the system; primary water/glycol on the condensing side and secondary water on the expansion side.
Posted in:
Leave a Comment (0) →Carbon Usage Effectiveness (CUE)
A metric defined by the Green Grid, which is a measure of data center sustainability in terms of data center specific carbon emissions. CUE is calculated by dividing the total CO2 emissions caused by total data center energy by the energy consumption of the IT computing equipment. An alternative way to calculate CUE is by multiplying the data center’s annual PUE by the Carbon Emissions Factor for the region as determined by the EPA. The units of CUE are kilograms of carbon dioxide per kilowatt-hour.
Posted in:
Leave a Comment (0) →Carbon Footprint
A measurement of the volume of Carbon Dioxide generated by business operations, units are commonly metric tons.
Posted in:
Leave a Comment (0) →CapEx
Capital Expense, the cost of purchasing capital equipment.
Posted in:
Leave a Comment (0) →Bypass Airflow
Conditioned air that does not reach computer equipment. Some bypass air is inevitable and without containment, some bypass air is prudent. Unintended bypass air can occur by escaping through cable cut-outs, holes under cabinets, misplaced perforated tiles or holes in the computer room perimeter walls.
Posted in:
Leave a Comment (0) →Building Management
Synonymous with BAS, AMS and other computer-based tools used to manage data center facilities assets such as UPS, Generators, Chiller Plant, HVAC, etc.
Posted in:
Leave a Comment (0) →British Thermal Unit (BTU)
A unit of energy. 1kWh = 3412btu. Cooling equipment capacity is commonly specified in btu/hr.
Posted in:
Leave a Comment (0) →Branch Circuit Monitoring (BCM)
A monitoring system used to record and monitor an individual electrical circuit. Typical parameters which are monitored include amperage, voltage, power factor, apparent power (volt amps), real power (watts) and energy usage ( watt-hours). The branch circuit is typically defined to be a the circuit fed by a single breaker or 3 phase set of breakers in a multi-breaker panel.
Posted in:
Leave a Comment (0) →Blanking Panel
A metal or plastic strip mounted in unused U spaces in a rack that restricts recirculation airflow, also called blanking or filler plates.
Posted in:
Leave a Comment (0) →Blade Server
A server architecture that houses multiple server modules (“blades”) in a single chassis. It is widely used in datacenters to save space and improve system management. Either self-standing or rack mounted, the chassis provides the power supply, and each blade has its own CPU, memory and hard disk. Redundant power supplies may be an option. Blade servers generally provide their own management systems and may include a network or storage switch.
Posted in:
Leave a Comment (0) →Amp (A)
A unit of electrical current.
Posted in:
Leave a Comment (0) →