U Ventilation/Air Conditioning Systems

Contents

U1 VENTILATION/FUME EXTRACT
U10 General Ventilation Supply/Extract
U11 Toilet Ventilation
U12 Kitchen Ventilation
U13 Car Parking Ventilation
U2 INDUSTRIAL EXTRACT
U20 Dust Collection
U3 AIR CONDITIONING - ALL AIR
U30 Low Velocity Air Conditioning
U31 Vav Air Conditioning
U32 Dual-Duct Air Conditioning
U33 Multi-Zone Air Conditioning
U4 AIR CONDITIONING - AIR/WATER
U40 Induction Air Conditioning
U41 Fan-Coil Air Conditioning
U42 Terminal Re-Heat Air Conditioning
U43 Terminal Heat Pump Air Conditioning
U5 AIR CONDITIONING - HYBRID
U50 Hybrid System Air Conditioning
U6 AIR CONDITIONING - LOCAL
U60 Free Standing Air Conditioning Units
U7 OTHER AIR SYSTEMS
U70 Air Curtains

U10 General Ventilation Supply/Extract

CONSIDER:
• Passive ventilation systems - but heat recovery is essential.
• Wind pressure driven air in and out with heat recovery is good as it avoids mechanical assistance.
• Passive or mechanical ventilation with heat recovery can extract heat from warm moist air to pre-warm fresh cool dryer incoming air.
• Overhead fans usually used for stirring warm air and driving it downwards may work in winter, but their use is doubtful in summer and will work against the stack effect used with passive ventilation in summer.

AIR AND WIND COOLING:
• The void below the building can be used to pre-cool the building overnight in summer through ventilation of the space or the floors themselves.

AVOID:
• Passive systems without heat recovery.
• Mechanical extraction without heat recovery.

U11 Toilet Ventilation

CONSIDER:
• Use wind driven air displacement systems with BedZED-type wind cowls

AVOID:
• Internal bathroom/toilets without windows/natural/passive ventilation.
• Mechanical ventilation except where smells/humidity will build up.

U12 Kitchen Ventilation

CONSIDER:
• Use wind driven air displacement systems with BedZED-type wind cowls

AVOID:
• Internal kitchens without windows/natural/passive ventilation.
• Mechanical ventilation except where smells/humidity will build up.

U13 Car Parking Ventilation

CONSIDER:
• Open perimeters
• Use open perimeter air intake and passive stack ventilation
• Use wind driven air displacement systems with BedZED-type wind cowls

AVOID:
• Underground parking without natural/passive ventilation.
• Mechanical ventilation except where fumes will build up.

U20 Dust Collection

CONSIDER:
• Central vacuum system in domestic/hotel/holiday accommodation buildings, outlets in skirting or dado rails, pipes built into walls and floors.
• Carry hose to rooms, connect hose to vacuum, brush dust to skirting intake.
• Electric motors need Green Tariff electric supply.

U30 Low Velocity Air Conditioning

CONSIDER:
• Terminal heat pump air conditioning.
• High thermal mass buildings, passive stack effect ventilation.

AVOID:
• Air conditioning except in the most severe climates.

U31 VAV Air Conditioning

CONSIDER:
• Terminal heat pump air conditioning.
• High thermal mass buildings, passive stack effect ventilation.

AVOID:
• Air conditioning except in the most severe climates.

U32 Dual-Duct Air Conditioning

CONSIDER:
• Terminal heat pump air conditioning.
• High thermal mass buildings, passive stack effect ventilation.

AVOID:
• Air conditioning except in the most severe climates.

U33 Multi-Zone Air Conditioning

CONSIDER:
• Terminal heat pump air conditioning.
• High thermal mass buildings, passive stack effect ventilation.

AVOID:
• Air conditioning except in the most severe climates.

U40 Induction Air Conditioning

CONSIDER:
• Terminal heat pump air conditioning.
• High thermal mass buildings, passive stack effect ventilation.

AVOID:
• Air conditioning except in the most severe climates.

U41 Fan-Coil Air Conditioning

CONSIDER:
• Terminal heat pump air conditioning.
• High thermal mass buildings, passive stack effect ventilation.

AVOID:
• Air conditioning except in the most severe climates.

U42 Terminal Re-Heat Air Conditioning

CONSIDER:
• Terminal heat pump air conditioning.
• High thermal mass buildings, passive stack effect ventilation.

AVOID:
• Air conditioning except in the most severe climates.

U43 Terminal Heat Pump Air Conditioning

CONSIDER:
• Terminal heat pump air conditioning.
• High thermal mass buildings, passive stack effect ventilation.

AVOID:
• Air conditioning except in the most severe climates.

U50 Hybrid System Air Conditioning

CONSIDER:
• Terminal heat pump air conditioning.
• High thermal mass buildings, passive stack effect ventilation.

AVOID:
• Air conditioning except in the most severe climates.

U60 Free Standing Air Conditioning Units

CONSIDER:
• Terminal heat pump air conditioning.
• High thermal mass buildings, passive stack effect ventilation.

AVOID:
• Air conditioning except in the most severe climates.

U70 Air Curtains

CONSIDER:
• Electricity Supply: ensure all sites are required to use a Green Tariff electricity supply throughout the works, commissioning and testing period and hand over the building to the Employer (Client) with the same Green Tariff electricity supply.
• The removal of the warm air curtain.
• Use of large draught lobbies to offer no protection from wind blowing away any heat built up in the building, especially when doors can be open on both sides of the building at the same time.

AVOID:
• Electric heating unless from renewable energy.