BS 8568:2013 pdf download

BS 8568:2013 pdf download.Cleanroom energy -Code of practice for improving energy efficiency in cleanrooms and clean air devices.
4.6 Impact assessment and prioritization
Once the potential energy saving opportunities have been identified from Table Al and a preliminary selection carried out, a detailed impact assessment report should be produced, covering all of the potential opportunities identified and taking into account the corresponding recommendations given in Annex B as well as the following business requirements:
• feasibility;
• process compatibility;
• risk;
• safety;
• cost;
• return on investment;
• incentives (e.g. government);
• implementation timeline/programme:
• implementation resources;
• business continuity.
This report identifies which energy reduction opportunities have become less viable or more challenging; these should be reprioritized behind those that can be easily and effectively delivered. A final prioritization and implementation programme should then be prepared.
Specifications and scopes of work should be defined for those opportunities that are to be implemented.
Where industries have standards or guidelines that specify performance requirements, all the situations where one or more performance requirements are in conflict with a particular proposed energy reduction measure should be identified.
NOTE Such performance requirements might include air quality (in terms of particle and microbial concentration), filter efficiency, unidirectional airflow velocity, room air change rate (by varying the air supply rate), recovery time and pressure differentials between adjacent rooms of different grades.
When these situations have been identified, the project team (see 42) should formulate a detailed justification to demonstrate that product quality is not affected by the proposed measure. Agreement from any authority concerned prior to implementation should then be obtained.
4.7 Implementation
The project team, now including the selected contractors and suppliers, should produce a detailed Implementation plan and undertake the work. The implementation plan should include the expected outcomes for all the selected elements.
4.8 Monitor. review and feedback
On completion of the project and thereafter at regular intervals, for each selected element, the expected outcome defined in the implementation plan should be monitored and reviewed to ensure that the changes remain effective. The associated energy reductions should be monitored, recorded and analysed. The information gathered should be used as feedback for continuous improvement.
Annex B Energy reduction opportunities in cleanrooms (normative) COMM ENTARY ON ANNEX 8
Annex 8 sets out energy reductron opportunities that can be applied to the design of new cleanroorns. Many of these can also be applied retrospectively to existing cleanrooms.
B.1 General
To deode whether the energy saving for each opportunity in Annex B is worth implementing, the energy savings should be first estimated. Once a decision has been made, the opportunity should be implemented in accordance with the relevant subclause.
Where specific energy saving measures are identified, the cleanroom operator should ensure that the cleanroom control parameters are not reduced to a level beyond which there Is an adverse threat to the quality of materials produced or the integrity of operations in the cleanroom.
When a cleanroom is operated with energy saving attributes, the performance parameters should be monitored to provide assurance that adequate levels of control are achieved during normal and turn down modes. The following parameters should be taken into account:
a) room or device pressure differential compared with less clean adjacent areas/rooms;
b) room or space temperature and relative humidity;
c) airflow velocity for unidirectional airflow systems;
d) airflow volume flow rate for non-unidirectional airflow systems.
Where energy saving features are included within the original design or as a retrospective modification, they should be specifically designed, effectively documented, correctly installed and accurately commissioned.
Where system complexity Is increased as a result of Inorporating energy efficiency features into the design of the cleanroom or its air handling system, the increased risk resulting from the increased complexity should be assessed as part of the decision-making process (see 4.4 and 4.5) required when selecting energy saving measures.
NOTE 85 EN ISO 50001 specifies that energy saving targets are ambitious. realistic. specific and measurable, and use the Best Available Technology (BAT). The viability of any proposed energy saving measures for a cleanroom should be assessed in accordance with BS EN ISO 50001.
B.2 Performance requirements
B.2.1 General
Overspecification of performance requirements and overdesigning should be avoided as part of any energy reduction campaign.
NOTE Performance requirements include values for primary parameters such as air cleanliness by partide concentration, and for secondary parameters that contribute to delivering the cleanliness, such as unidirectional airflow velocity (UDAFL airflow volume flow rate (non-4JDAf) or room pressure differentials.