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Article Date: 7th October 2013

Frenger Multi Service Chilled Beams with Ground Source Heat Pumps

Chilled Beams - Cooling Systems - Radiant Cooling - Heat Pumps

Frenger Chilled Beams

Multi Service Chilled Beam (MSCB) specialists 'Frenger' have supplied their 'Radiant' passive MSCB's for a prestigious speculative office development operating in conjunction with sustainable ground source energy in the heart of Mayfair's conservation area.

The project, developed for Grosvenor Estates was rated BREEAM 'Excellent' and completed at the end of 2012 providing Grade 'A' office spaces across 5 floors.

The architectural aspirations for the project were set out at an early stage to provide a unique aesthetic for the building interior and the services contained within. Frenger were selected by the design team due to their unique ability to offer full 'Turn Key' design for both mechanical and electrical elements of the MSCB's using their 'in-house 3D design suite' to produce life-like CGI images of the proposed units before any material procurement. This allowed the design team to make changes to the initial design proposals for the MSCB's without the abortive costs associated with physical manufactured samples before full scale mock up in one of Frenger's 3 Climatic Test Laboratories.

"Frenger's 'Radiant' passive chilled beams provided the cooling 'engine' contained within the MSCB's, allowing high levels of sensible cooling to be provided (up to 300 W/m) without the risk of uncomfortable draughts created by traditional fin coil passive beam systems which use 95% convective airflow to deliver cooling" says Michael Ainley, Managing Director of Frenger.

Frenger's latest generation of passive chilled beams have a 'Radiant' quotient of approximately 40% with the remaining cooling effect (60%) being provided by convective airflow which means that for the same cooling effect, the air velocities below Frenger's 'Radiant' beam are 40% less when compared to traditional fin coil technologies. The resulting effect of this combined cooling effect is higher levels of cooling, lower air velocities and unrivalled thermal comfort for the occupants. This ultimately gives the building designers the freedom to locate the MSCB's in the optimum positions for cooling and lighting distribution without the need to co-ordinate the units with user workstations through fear of any uncomfortable draughts.

The MSCB's at 'Fifty Grosvenor Hill' are freely suspended below an exposed concrete soffit. The ability of Frenger's 'Radiant' beams to exchange energy via long wave radiation meant that as well as providing high levels of cooling for the occupants, cooling could also be provided into the structure of the building resulting in lower 'peak' cooling demands and lower energy consumption. Recent energy simulations with government recognised part L compliance software provider EDSL Tas has revealed that 'radiant' cooling is 7% more energy efficient than convective only passive cooling which incidentally faired 17% more efficient than VAV fan coils with EC motors in a recent energy study comparison presented by Dr Alan Jones, Managing Director of EDSL, at the Building Centre, London, 29th July 2013.

The development at Grosvenor Hill also won the London and South East regional award from the British Council for Offices (BCO). The judges commented: “The team has delivered a sophisticated solution to the challenges presented from a constrained site. The design delivers a flexible, contemporary workplace which is sensitive to its urban environment.”

To further enhance the energy performance of the building, Frenger's 'Radiant' MSCB's were combined with an open loop ground source renewable energy system which provides 100% of the building’s heating and cooling requirements. This innovate approach to comfort cooling meant that no chillers or boilers were required on the project, freeing up valuable space and providing an Energy Performance Certificate (EPC) rating of only 36.

"Passive & Active Chilled Beam Technology is ideally suited for use with Ground Source Renewable Technologies" says Michael Ainley. "The ability of chilled beam technology to operate with significantly higher chilled water temperatures (typically 14°C and above) when compared to other forms of comfort cooling provides significant reductions in energy consumption, energy cost and CO2 emissions".

The aforementioned recent EDSL study indicates that with chilled beams operating with usual industry standard 14/17 C F&R from a chiller with free cooling, convective only chilled beams provide energy savings of 17% and active beams 22% when compared with a VAV Fan Coil Unit solution operating on 6 / 12°C and even more energy reductions can be afforded when chilled beams are used in conjunction with renewable and sustainable methods such as Ground Source heat pumps and / or radiant passive cooling.

The exemplar installation at Fifty Grosvenor Hill illustrates perfectly the ability of Chilled Beam Technology to provide architecturally stylised comfort cooling within modern commercial spaces without compromising occupant comfort or energy performance.

For further information on Frenger Systems range of 'Radiant' passive beams, Active Chilled Beams or Radiant Heating technology, please contact their Technical Centre in Derby by using the email option below.

For more information regarding the recent EDSL energy comparison study please visit the FETA (the Federation of Environmental Trade Associations) web site and down load from www.feta.co.uk/hevac/specialist-groups/chilled-beams--ceiling-association.

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