Shared Vision is a finalist in the prestigious AT Awards 2021, for Excellence in Architectural Technology! AT is the journal of the Chartered Institute of Architectural Technologists. The awards ceremony will be hosted by TV's Matt Allwright. Livestream on YouTube 22nd October 16:30 GMT!
The new apartment building at 14-16 Cogan Terrace is a collaboration between Chartered Architectural Technologist Mark Wright MCIAT, and Engineer and Building Management System Manufacturer, Joe Miles CEng. The building uses Joe's new Atamate Smart-Building Management System to achieve better than Passivhaus performance from a building envelope with a fairly modest specification.
This new apartment building, providing 14 bedrooms in 6 flats, is amongst the most technologically advanced and highly performing domestic buildings in the world. A pair of dilapidated and damp HMO's with cramped layouts were demolished to provide healthy and comfortable homes for students of the adjacent Cardiff University. In densely occupied and gadget-packed student lets, internal heat gains are very high, and in the moderate Cardiff climate, fabric losses are low. Cooling is therefore a more significant factor than heating. Rather than being recirculated by an MVHR system, heat extracted from ventilation air can be harvested to produce domestic hot water, which would otherwise be the most significant energy demand. Engineer Joe Miles commissioned a new building of good thermal resistivity, resistant to solar gains, and with sufficient airtightness for a mechanical ventilation system to operate intelligently. A breathable building fabric minimises humidity build-up, and consequently infiltration of fresh air required for human health and comfort. The internal environment is continuously monitored, and ventilation and heating managed on-demand by an Atamate Smart-Building Management system, designed and manufactured by Joe Miles, the owner, co-designer, and builder of 14-16 Cogan Terrace.
Building Technology Strategy · Minimise fabric heat loss and air leakage within budgetary and floor area constraints. · Heat domestic hot water with heat recovered from extracted stale air (as determined by Atamate sensors). · Manage residual energy demand with an Atamate Smart Building Management System. · Vapour-open construction to minimise vapour pollution load (humidity). Using this strategy, total annual energy demand has been independently recorded as 12kwh/m², better than the Passivhaus Standard of 15kwh/m². Although the ultimate resistivity of the building building fabric is constrained by a small footprint, and the client requirement for vapour-open construction, the fabric is very well insulated, and in Cardiff's maritime climate, fabric losses are extremely low. As the domestic hot water is heated by Ecocent extract-air heat pumps, a gas boiler can be avoided, and space heating (as little as 300w per room @ ΔT 23°) is easily provided by small electric panel heaters. Electrically actuated fanless ventilation apertures, in combination with electrically actuated skylights, provide fresh air to habitable rooms, only in response to occupation. This Demand Controlled Ventilation (DCV) gives very significant energy savings in comparison to regular trickle vents, as shown in the bar chart.
Materials and Construction
Local natural and high-performing products were specified where possible;
· Durisol insulated concrete formwork made in Wales using recycled wood. · Ty Mawr Glaster lime render made in Wales. · The Atamate Smart Building Management System, also made in Wales. · Earth Save Products Ecocent heat recovery hot water system, made in England. · Lewis Deck profile metal decking, used as a working platform before screeding, allowed for progress to continue smoothly. · Pozi-joists allowed the first floor to span between the party walls to give an adaptable layout. · A specialist monolithic reinforcement design transfers the mass of the front elevation to foundations set well within the boundary. · Steico wood-wool insulation and insulated I-joists provided a vapour-open roof, and is covered with a Solitex breathable membrane.
Durisol Insulated Concrete Formwork
Lewis Deck Profile Metal Decking
Solitex Plus Breathable Membrane
Atamate Smart-Building Management System
The Atamate Smart-Building Management System monitors the building using a network of sensors. By controlling a system of variable air intakes, skylights, extract air heat-pumps, and panel heaters, it automatically manages the internal environment of the building in response to occupational factors such as breathing, cooking, and washing. The system also provides an interface between lighting, sound, security and door entry, using a user friendly app. Machine learning is used by the system to continuously improve building performance. The system is remotely accessible, for performance monitoring, and administration of the entry system etc.
· Buildability and Assembly: The selection of Durisol, that was assembled by carpenters without a scaffold, and Lewis deck, that gives excellent sound proofing but can also be used as a working platform, allowed the tightly constrained site to be organised in an uncluttered way. Significant time was invested in providing construction details showing the complex interaction of the structure, insulation, and breathable membranes to assist the construction team who were initially inexperienced with the new technologies. · Functionality and Inclusivity: The continuous monitoring and control of the building, coupled with a well performing envelope, give an in-use performance better than Passivhaus standard. Current building regulations provide for much better accessibility than the previously existing houses. The internal environment of the building is extremely fresh and open feeling, and with usable outside space, tenants are extremely happy and flats let quickly. Smaller unit sizes, excellent sound proofing, and state-of-the-art door entry system gives every assurance to vulnerable tenants who are not served by the traditional HMO market. ·Innovation and Sustainability: This building is a complete expression of the sustainable building philosophy of the project team in 2014; in technology, performance, and materials selection. The building is performing excellently, and is now a 5 year post-occupancy study. · Performance and Robustness: - The building has exceptional performance as demonstrated in the post-occupancy study. The reinforced concrete structure and high quality windows etc are specified for longevity and low maintenance. Thermal bridging losses in the Durisol bay window reduces the performance of the ground floor flat. Steico might have been a better solution.
Smart Apartments - Finalist AT Awards 2021
Mark Christopher Wright BSc MCIAT
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