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Date Posted: 17:56:55 11/21/03 Fri
Author: 何焯華條賓周+歡迎炸佢: jameslam@hkpro.com.hk
Subject: 淨屌何焯華條仆街呢+歡迎炸佢: nancychow@hkpro.com.hk

21/11/03 Rehabilitation and mechanical and electrical services issues Mike Coffey

Refurbishment of office factors to be considered
1.Building factors
-sources required
-flexibility of use(Churn rate)
-quality

Lathern report?

2.Existing Building
-Consideration
-Shape and layout and height
-Structure
-Window area
-Floor to soffit height
-Clear spans
-location
-access

3. Cost

4. Staturory regulations
-fire
-building
-noise
-environment
-Soffit
-energy

5. Fuel sources
Space allocation
-plant rooms
-vertical distribution
-horizontal distribution#
-maintenance

6. Space
-for plant
-for distrbution
-stratage decision-must be taken early in planning and design stage
-major consideration throughout
-quality
-maximum diminsions
-location

Capital plant
-Basement
-Roof
-Intermediate

Basement
-access
-noise
-load
-floor to soffit height
-flood change
-fire control and access
-horizontal distribution
-vertical distribution
-intakes and dischanges to outside
-maintenance and access

Roof
-Structure load
-flexibility of equipment choices
-aesthetics
-building height
-noise
-vibration
-leakage
-fire access
-fuel supply
-horizontal distribution
-vertical distribution
-water sealing
-maintenance and access

Intermediate
-loss of leftable space
-noise
-accommodation of
-minimise vertical distribution
-minimise horizontal distribution
-access
-maintenance

*20 storey maximum distribution length

7. Distribution
-distribution trees
(a)vertical component
-rises
-services outlets via branches within 16-20m radius
-economic size
-engineering size
-air ducts occupy most space
-allow 1 m2 for every 5m3/sec of flow
-shape 2:1 to 4:1 ratio
-position:-must have at least 2 sities free

Air distribution take most space =2% S.I.F.A
by comparsion

electrical=20%
plumbing =15%
space =10-15%

-if space limited
-elimate vertical ducts
(A. H.V on each floor)
-local air can units
-fan cool units
-minimise by H.V duct =1/3 size

Electrical refurbishment
Thorough survey to examine and evaluate existing systems

Aim to re-use as mush as is:
-economic
-possible
-safe

Electrical engineer essential

Incoming service
Property of the electrical supplier
Capacity
-use
-load analysis
-availability
Cable condition
-supplier will check and test

Cost

Transformers
-owned by supplier
-accommodated within building
-oil filled not allowed within building now
-supplier has space and constructional requirements

Transformers
-owned by supplier
-accommodated within building
-oil filled not allowed within building now
-supplier has space and constructional requirements

Main switchgear

capacity
age
suitability
obsolescence
-IEE Regs
revamped distribution of loads

Major item of work

Modular construction allows easy access to existing switchrooms

Building requirements
-ventilation
-fire protection and detection
-access and clearances

Space capacity allowance

Sub-mains distribution

Existing
-capacity
-age
-layout
-flexibility
-suitability

Complete replacement expensive and significant undertaking
-only on major re-furbs
-where new function demands
-seldom causes problems

Option
-cables on tray on ladder
-buss bars

Lighting
Major part of refurbishment

Affects
-aesthelics
-use
-rent/lettability
-function
-flexibility

Significant cost

Fitting
-arrangements
-form
-quality
-type

Light control energy efficiency

Integration into the building and fabric
-suspended ceiling
-interception patterns
-luminance patterns/ effects

Suspended ceiling
most common
accommodation of fitting and wiring permits
direct lighting

Number of significant advantage

co-ordinate dimensions

integrate with:
-air conditioning
-structure
-fire protection(sprinkless)
-PA
-other services
-partitioning

Large range of possible options fittings,etc

Emergency lighting

Escape lighting
Safety
Standby

Escape
self-contained units
10 luc
separate or part of normal fittings

Safety
allows safe shut down of equipment etc

Fire alarm systems

Code upgrades

Older systems and equipments quickly become obsolete

Wiring FP200,MICC or equipment easy to accommodate and hide

Interlinked to life safety system
ie-lifts
-sprinklers
-fans(pressurisation and extract)
-smoke vents
-communication

Relationship between detection-protection and zoning

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