BS 8568:2013 pdf download – Cleanroom energy – Code of practice for improving energy efficiency in cleanrooms and clean air devices
3Terms and definitions
For the purposes of this British Standard, the following terms and definitionsapply.
3.1air handling unit(AHU)
unit or plant, comprising fan,filtration, heating, cooling and mixing of fresh airand recirculated air, that delivers conditioned air to a room or facility
3.2clean air device
stand-alone equipment for treating and distributing clean air to achieve definedenvironmental conditions
[SOURCE: BS EN ISO 14644-6:2007,2.31]
NOTE Clean air devices include certain separative devices as defined inBS EN ISO 14644-7, for example, clean air hoods, containment enclosures,gloveboxes,isolators and mini-environments.
room in which the concentration of airborne particles is controlled,and which isconstructed and used in a manner to minimize the introduction, generation, andretention of particles inside the room, and in which other relevant parameters,e.g.temperature,humidity and pressure, are controlled as necessary
[SOURCE: BS EN lSO 14644-6:2007,2.33]
3.4colony forming units (CFUs)
single micro-organism or a single small mass of micro-organisms that whendeposited on a microbiological growth medium grows to form a single visiblecolony that can be counted
NOTE One colony forming unit is expressed as 1 CFU.3.5combined heat and power
electrical generation by internal combustion engine or gas turbine with thewaste heat from this process being used to generate hot water or steam
3.6controlled environment
defined zone in which sources of contamination are controlled by specifiedmeans
[SOURCE: BS EN lSO 14644-6:2007,2.45]
3.7critical zone
area where the product is exposed to the potential deposition of airbornecontamination
3.8final filter
last high efficiency filter in the system before the air enters the cleanroomNOTE This may be in the AHU or it may be a terminal filter (see 3.12).
3.9high efficiency air filter
air filter conforming to BS EN 1822(all parts), covering the range of efficientparticulate air filters(EPA):E 10-E 12, high efficiency particulate air filters(HEPA):H 13-H 14 and ultra low penetration air filters (ULPA):U 15-u 17
3.10microbe-carrying particle (MCP)
particle on which a micro-organism is carried; it is normally dispersed into roomair by personnel as a skin cell, or fragment of skin cell, on which a skin
microbe(s) is carried
non-unidirectional airflow (non-UDAF)
air distribution where the supply air entering the clean zone mixes with theinternal air by means of induction
[SOURCE:BS EN ISO 14644-6:2007,2.95]3.12terminal filter
high efficiency air filter located at the point where the air enters the cleanroom
electrical generation that is integrated with both heat and chilled watergeneration
3.14turn down
controlled reduction of airflow velocity in UDAF cleanrooms and clean airdevices and airflow rates in non-UDAF cleanrooms in order to save energyduring periods when the cleanroom is not in operation
3.15unidirectional airflow (UDAF)
controlled airflow through the entire cross-section of a clean zone with a steadyvelocity and approximately parallel airstreams
NOTE This type of airflow results in a directed transport of particles from the cleanzone.
[SOURCE: BS EN ISO 14644-6:2007,2.138, modified – Note 2 has been deleted.J
4The energy evaluation and implementation
Energy reduction in new and existing cleanrooms and separative devices shouldbe carried out in accordance with the process described in this clause and
summarized as a flowchart in Figure 1.
4.2 Selecting a project team A project team should be set up to include representatives from the key business functions such as quality, validation, production, planning, finance, engineering, maintenance and cleanroom energy experts. NOTE Additional expertise can be provided by internal or external consultants.
4.3 Gathering information
4.3.1 General Documents, including drawings and specifications, and information that define the cleanroom performance criteria should be collated; this might take the form of existing quality risk assessments or facility operational assessments. NOTE The objective is to identify criteria that affect performance and to consider the direct and indirect impacts of possible energy reduction actions. A survey of the facilities should be carried out and reviewed to identify all the energy saving opportunities, see Annex A.