Page 58 - Toucan_Modules_EN
P. 58

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                  refrigerants have high GWP. Many new refrigerants will be based on ammonia or CO2.
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                  Ask  your  service  provider  about  the  best  products  for  efficiency  and  environmental
                  performance.
                  B u i l d i n g   m a n a g e m e n t   s y s t e m s
                  Building management systems
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                  A building management system (BMS) provides automated control of energy efficiency
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                  A A     b u i i l l d i i n g     m a n a g e m e n t t     s s y s s t t e m     ( ( B M S ) )     p r r o v i i d e s s     a u t t o m a t t e d     c o n t t r r o l l     o f f     e n e r r g y     e f f f f i i c i i e n c y
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                  a a n d      o c c u p a n t t      c o m f f o r r t t      f f r r o m      a      s s i i n g l l e      d i i g i i t t a l l      i i n t t e r r f f a c e . .      B M S      m o n i i t t o r r s s      a n d
                                                                                    n
                                     m
                              a
                                                                                          a
                  and  occupant  comfort  from  a  single  digital  interface.  BMS  monitors  and  controls
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                  e e l l e c t t r r i i c a l l     a n d     m e c h a n i i c a l l     s s e r r v i i c e s s , ,     s s u c h     a s s     H V A C     a n d     l l i i g h t t i i n g . .     I I t t     c a n     a l l s s o     i i n c o r r p o r r a t t e
                                                       c
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                  electrical and mechanical services, such as HVAC and lighting. It can also incorporate
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                  services such as security, access control, elevator and safety systems.
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                  Depending on specific application and configuration, a BMS may be known as a:
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                      ·    building automation systems (BAS),
                         building management and control system (BMCS),
                      ·    b u i l d i n g   m a n a g e m e n t   a n d   c o n t r o l   s y s t e m   ( B M C S )
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                      ·    building energy management system (BEMS).
                  A   B M S   c a n   b e   p r o c u r e d   a s   a   c o m p l e t e   p a c k a g e   o r   a s   a n   a d d  o n   t o   e x i s t i n g   s y s t e m s .
                  A BMS can be procured as a complete package or as an add-on to existing systems.
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                  BMS applications are based on open communications protocols and are web-enabled,
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                  f for the integration of systems from multiple vendors.
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                  Compared  with  separate  control  systems,  a  BMS  offers  centralised  control,  flexibility,
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                  C C o m p a r r e d      w i i t t h      s s e p a r r a t t e      c o n t t r r o l l      s s y s s t t e m s s , ,      a      B M S      o f f f f e r r s s      c e n t t r r a l l i i s s e d      c o n t t r r o l l , ,      f f l l e x i i b i i l l i i t t y , ,
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                  interactivity  and  feedback.  A  new  BMS  should  be  an  essential  consideration  of  any
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                  major  building  fit-out  or  plant  upgrade.  A  BMS  older  than  10  years  is  likely  to  benefit
                                                                              0
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                  f from an upgrade or replacement.
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                  Main reasons to consider upgrading:
                       r
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                                    n

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                      ·    reliability issues,

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                      ·    poor condition of components,

                      ·    l lack of web compatibility,


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                                   i
                                             o
                                y
                      ·    difficulty with incorporating new equipment and sensor,
                                         o
                         ability to perform monitoring and reporting.
                      ·    a b i l i t y   t o   p e r f o r m   m o n i t o r i n g   a n d   r e p o r t i n g .

                                           s
                                                                e

                  A
                                         l
                            S
                                         o
                                                 o
                                                                    n
                                                                                     2
                              h

                  A new BMS should be closely monitored and fine-tuned for at least 12 months. A system
                                                                                a
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                  may initially perform badly due to poor commissioning. Control loop tuning will ensure
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                  equipment operates in a stable, predictable and repeatable manner.
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                  Specifications should include:
                  S p e c i f i c a t i o n s   s h o u l d   i n c l u d e :
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                      ·    a c c u r a t e   c o n t r o l   o f   c o m f o r t   c o n d i t i o n s
                         accurate control of comfort conditions,
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                      ·    precise start-up and run times,
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                         economy cycle including CO2 occupancy control,
                      ·    e c o n o m y   c y c l e   i n c l u d i n g   C O 2   o c c u p a n c y   c o n t r o l

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                      ·    removing overlap between systems, such as HVAC,
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                      ·    adjusting for seasonal conditions, including variable plant sequence selection,
                         air pressure and coolant temperature control.
                      ·    a i r   p r e s s u r e   a n d   c o o l a n t   t e m p e r a t u r e   c o n t r o l .

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                  To get the most out of a BMS, correct location and calibration of sensors is crucial. This
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                  ensures the BMS is responding to accurate readings at all times.
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