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Hot Aisle Containment System - Directs heated air from the outlet side of racks to air conditioning equipment return ducts in a highly efficient manner.
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Harmonic Distortion - Harmonic distortion is found in both the voltage and the current waveform. Most current distortion is generated by electronic loads, also called non-linear loads. These non-linear loads might be single phase loads such as point-of-sale terminals, or three-phase as in variable speed drives. Â As the current distortion is conducted through the normal system wiring, it creates voltage distortion according to Ohm's Law. While current distortion travels only along the power path of the non-linear load, voltage distortion affects all loads connected to that particular bus or phase. Current distortion affects the power system and distribution equipment. It may directly or indirectly cause the destruction of loads or loss of product. From the direct perspective, current distortion may cause transformers to overheat and fail even though they are not fully loaded. Conduc tors and conduit systems can also overheat leading to open circuits and downtime.
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Heat Exchanger - A device used to transfer heat energy, typically used for removing heat from a chilled liquid system
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Heat Load - Amount of heat required to be removed within a certain period of time. Usually measured in British thermal units (Btu) or watts.
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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 back to the Computer Room Air Conditioning systems return vents.
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High Performance Data Center - Data Center with greater than 10Kw/rack loading.
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Hot Spot - Where ambient air temperature is above defined levels of operations. Typically caused by heat generation in excess of cooling equipment capacity.
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HVAC - Acronym for Heating, Ventilating, and Air Conditioning.
