Page 26 - ISCC'22
P. 26

25 th  INTERNATIONAL S YMPOSIUM
                    October 11-13,   ON CONTAMINATION CONTROL AND
           Antalya TURKIYE  |  2022  CLEANROOM TECHNOLOGY
                           26




































                VERTICAL
           TRANSPORTA-
          TION THROUGH
            CONTROLLED
        ENVIRONMENTS:
            A CLEAN LIFT        Figure 2: clean environments designation
        PROTOTYPE FOR           Moreover, in this case study, the environments engaged in the clean lift system are served
          MULTIPURPOSE          by three different HVAC systems managed by three different control logic systems.
                      USE       2.3 Clean lift HVAC and finishes

                                The core of the entire system designed is the clean lift which is composed of the mechanical
                                components for vertical movimentation, the shaft and the cabin lift itself.
                                Vertical movement is guaranteed by means of an oledinamic system based on a single iron
                                piston properly designed and installed to be used in clean environments. Ancillary compo-
                                nents such as pipes, wires and control of the oleodinamic sytem were chosen to minimize
                                particle and contamination release in the shaft environment and to easy future maintenance
                                activities.
                                The actvities and the spaces in the lift shaft were conceived as a CNC (Clean Not Controlled)
                                environments made of concrete with a final finishing of clean epoxy resin througout all in-
                                ternal surfaces. The cabin lift is a customized cabin properly designed for people and prod-
                                ucts transportation. The internal surfaces are made of polished stainless steel while floor
                                is made of clean vynilic sheet.The ventilation within the cabin is delivered by a customized
                                FFU (Fan Filter Unit) equipped with HEPA H14 filter (ISO 29463-1, 2017) and an ISO Coarse
                                55% (ISO 16890-1, 2016). The turbulent airflow within cabin is done by an high induction
                                multi diffuser-adjustable nozzles able to guarantee a smooth and uniform air distribution
                                within the entire area of the cabin. Air is introduced in cabin from the top and extracted by
                                a serie of specular return grilles located on the two long sides of the cabin. In this way, a
                                top-down like flow of clean air over personnel and products, as shown in Figure 3, can easily
                                be achieved even in off-design conditions. Moreover, the possibility to set the direction of
                                the nozzles’diffusers let the opportunity to have an high induction flow of clean air even in
                                the areas close to wall and ceiling, generally stagnant areas, therefore avoiding zones of
                                contamination accumulation.
   21   22   23   24   25   26   27   28   29   30   31