William Jones Building – Environmental Management

William Jones Building

Two Basic Operating Modes

summer modeNatural Ventilation

winter modefull mechanical ventilation with heat recovery (MVHR)

William Jones Building

summer modeNatural Ventilation

• cooler air in -reduces temperature & lowers CO2 level

• low level manual opening windows(operated by staff & pupils when fresh air is required)

• high level automated opening windows (operated by staff when additional fresh air required)

William Jones Building

summer modeNatural Ventilation

• stack effect ventilation (chimney principal) (high & low level ventilation using the differential pressure)

• warm & stale (CO2 laden) air is drawn out of the rooms into the voids via acoustically attenuated ventilation ducts

William Jones Building

summer modeNatural Ventilation

• warm, stale air is drawn out via the modulated ceiling voids to the high level vents, either;

• glass louvres to the light wells, or

• ventilation turrets for level four rooms

William Jones Building

winter modefull mechanical ventilation with heat recovery (MVHR)

• Windows ideally remain closed to gain full energy efficiency

• stale air is extracted via the ceiling and ducts via the void and drawn through the ends of the lightwell at high level to the MVHR unit

• the MVHR unit extracts heat from stale air, transfers that heat to fresh intake air, and redistributes as tempered fresh air to the building

William Jones Building

winter modefull mechanical ventilation with heat recovery (MVHR)

• ‘tempered’ fresh air is re-circulated via MHVR unit and ducts to each room on the window facade side of the building

Two Basic Operating Modes

Summer Winter

• Natural ventilation using open able windows & light   wells/roof ventilators• Automatic ground floor mechanical supply all year based on presence detection (9am – 5pm)• User over‐ride controls bring on mechanical supply ventilation on a floor by floor basis for a set duration• Mechanical supply ventilation automatically brought on, on a floor by floor basis if one classroom exceeds 28oC

(external temp > 17oC) (external temp < 17oC)

• Automatic mechanical supply & extract to every floor based on presence detection (9am – 5pm)• Heat recovery from extract air, through air handling unit• Windows can be opened if desired • User over‐ride controls bring on mechanical supply & extract ventilation on a floor by floor basis, out of hours, for a set duration• Dampers to roof turrets/louvers shut

Ventilation Strategy – User Overview Summary 

Natural supply ventNatural extract ventMechanical supply ventMechanical extract vent 

User Over‐ride (Summer Mode & Winter Mode Out of Hours)

User over‐ride switches in corridor of each floor bring on the mechanical ventilation to the entire floor for a pre‐set length of time.

Ventilation Strategy – User Overview Summary

Natural supply ventNatural extract ventMechanical supply ventMechanical extract vent 

William Jones Building

BREEAM EXCELLENT RATING for ENERGY

• Very Highly Insulated Building Fabric

• Triple Glazing, thermal and solar control glass

• Very Low Air Leakage Rate

• Thermal Mass of building

• Low energy consumption heating, ventilation and lighting

• Renewable Energy contribution via photovoltaic panels