- Intermittent extract and background ventilators provide rapid extraction of moisture through local extract fans installed in windows, ceilings or external walls. They can be controlled occupant or automatically but have high running costs and noise potential if poorly installed. - Whole house ventilation with heat recovery (MVHR) uses supply and extract ventilation with a heat exchanger unit located in the loft or utility room. It continuously extracts air from wet rooms while drawing in fresh air, passing the warm extracted air through the heat exchanger before venting outside and supplying fresh filtered air inside. It saves energy and is proven as a low energy, efficient system. - Potential issues include frost buildup reducing effectiveness in cold climates and damage to

25. Intermittent extract &
background ventilators
• Classic method of ventilation
• Local extract fans are installed for
rapid extraction purpose
• Suitable to be used in houses,
flats and apartments
• Difficult to apply to single
dwelling with single facade

26. Benefits of Intermittent extract & backgr
• Provide rapid extraction of moisture
• Fans can be mounted in window, ceiling
or external wall
• Can operate either occupant or
automatic control

27. Possible problem
•High running cost
•Noise potential if it is poorly installed
•Might require additional background
ventilators fitted at low level

28. Whole House Ventilation with
Heat Recovery (MVHR)
• Comprises a Heat Recovery Unit
and a network of ducting
• Located in the loft space of a
house / utility room in an
apartment
• Works by using both supply and
extract ventilation
• Proven as a low energy & highly
efficient way of ventilating

29. Concept/ Application of MVHR system
• It works by continuously extracting
air from the wet rooms
• At the same time, drawing in fresh
supply air from outside
• Warm, extracted air
is passed through
the heat exchanger
before being ducted
outside to the
atmosphere
• Fresh, filtered &
tempered air is then
supplied into living
rooms,dining areas
& bedrooms

30. Benefits of MVHR system
•Year round removal of condensation and indoor
pollutants
•Helping reduce carbon footprint of the property
•Fresh, filtered air supplied to dwelling, ideal for allergy
sufferers
•Saves energy costs
•Very low noise levels
•Compact, light weight and easy to install
•Fits into nearly any wall depth and orientation

31. Possible problems to MHVR system
• In cold climates, very cold air brought into a heat
recovery system can cause frost formation in heat
exchanger.
• Due to frost build up reduces ventilation effectiveness
and can damage the heat exchanger, heat-recovery
systems must have devices to deal with frost.

37. Future Recommendations

40. Case Study - One City Sky Park
• Located in USJ 25
• Designed to be both contemporary and sustainably environment friendly
• Since the completion of One City Sky Park, the development has received
the Green Building Index Provision Silver certificate. A key green feature is
its use of natural light to lit the interiors of Sky Park

41. GBI Certification Proof

42. Passive Design Features
1. Vertical green wall that cover the wind channels
• Hanging greenery such as vines or
creepers with Stainless Steel Wire
Trellis System
• Protect exterior finishes and masonry
from UV radiation and rain
• Increase the seal or air tightness of
doors, windows, and cladding by
decreasing the effect of wind pressure
• Lower the air temperature around
intake valves

43. 2. Water Features
•Provide a peaceful backdrop to
occupants
•Purifying and humidifying the air
around
•Generate beneficial negative
ions into the environment

44. 3. Wind Channels
• Daylighting
• Allow cross ventilation
and stack effect
ventilation

45. 4. Glass panel walk path as means of natural lighting
• Made up of double layer heavy duty tempered glass
• Prevent the heat from entering the space
• Allow sufficient daylight