Passivent solutions contributes to ‘excellent’ rating

A new home for part of the Ministry of Defence is optimizing environmental friendliness and cost efficiency, largely through the diversity of solutions from Passivent Ltd.

Defence Estates, the property and estates management arm of the MOD, worked with industry partner Debut Services to remodel an existing two storey building to centralize the Service Personnel and Veterans Agency (SPVA) operations at Imjin Barracks, to create a more effective and efficient environment for the team. A key criterion of the design brief was to make the 1960s, 3800m2 building as sustainable as possible, achieving an ‘excellent’ rating under DREAM (Defence Related Environmental Assessment, equivalent to the ‘mainstream’ BREEAM tool).

Passivent’s breadth of sustainable solutions enabled Debut to use just one source to design and supply an integrated, complimentary internal office environment, maximizing natural resources of air and light- and simultaneously cut both installation and running costs.

Chris Kenny, project architect at Stride Treglown who designed the building for construction by Debut Services, elaborates, “The original building was 80% mechanically ventilated. We needed to replace the façade, so decided to explore the use of natural ventilation through openable windows and Passivent natural ventilation to ensure good levels of ventilation throughout the deep plan: this option was actually cheaper than maintaining the façade and replacing all the M&E plant associated with mechanical ventilation!

“We were also concerned about providing adequate daylight, especially in the deep plan circulation areas: Passivent’s Sunscoops optimize natural light across the floor space,  thereby improving the quality of that space, and reduce running costs.”

Passivent’s ventilation strategy encompasses a selection of Passivent’s products, chosen to deliver the design requirements.  In total, six Passivent RAD Airscoops- ventilation terminals divided into four chambers- mounted on the roof of the building both draw fresh air through their windward chambers into the upper storey of the building, displacing the ‘used’ internal air and extracting it via the leeward chambers. The RAD Airscoops offer the flexibility whereby the internal windward chambers can be adjusted to provide airflow without draughts where needed, even if the office layout is altered.

On the ground floor, five Aircool motorized ventilators installed above the windows draw fresh air in; a roof mounted Airstract acts as a passive stack, exhausting the ‘used’ internal air. All the ventilators are operated by the iC7000 controller, which monitors indoor air temperature and quality including CO2 and adjusts the ventilation rate in larger office environments to maintain the required levels of 10l/s/person of outdoor air supply.

Complimenting the natural ventilation, 38 no.  350mm dia Sunscoop™ tubular rooflights optimize penetration of natural daylight into all areas of the building, without artificial light. Each Sunscoop features a Light Sun Deflector (LSD) which can further increase the natural light level within by up to 20%, minimizing the need for artificial lighting.

Paul Nix, Debut Core Works Director, commented, “Collaborative working between ourselves and our supply chain partners, including Passivent, has ensured that we have delivered a high quality, sustainable facility for our customer.”

Passivent is the UK’s leading supplier of natural ventilation and daylighting systems for both domestic and commercial applications. The company is a founder member of the NatVent EC-EU-funded project co-ordinated by the Building Research Establishment to develop practical natural ventilation solutions for the commercial sector, and has contributed to the BISRIA guide BG2/2005 Wind Driven Natural Ventilation Systems, as well as being members of the DfES steering committee on ventilation guidance for schools, Building Bulletin 101. Its range of rooflighting solutions, including Sunscoop™, is eligible for BREEAM credits under both Energy and Health & Wellbeing.

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