design: Klaas Vermaas
The aim of this study was to reconsider the design of the popular Dutch terraced or row-housing type with regard to energy efficiency and sustainability.
Based on the trias energetica approach, the design aims to reduce energy loss, maximize passive solar gain and supply any further energy need by a sustainable source.
In addition, the choice of building materials is based on the possibility of prefabrication, dry assembly and reusability/ circularity.
The house is oriented due south for maximal solar gain in winter, with its southside glazed and its north side closed and heavily insulated. Balanced ventilation with heat recuperation reduces heat loss in winter. The compact functional layout has kitchen, stairwell and bathroom all located along the north side. Indirect sunlight is channelled to these spaces through the strip windows at the top, reflected and diffused by the curved inside surface of the north wall.
To prevent overheating in summer, the south -facing external cladding of the roof is coated white and movable Pv panel filled sections act as a sun visor. The elevated rail mounting of these sectional panels and the rounded shape of the house provide an airstream underneath, lowering the temperature and improving efficiency of the solar panels. The visors can be brought all the way down, effectively shuttering the house when it is not occupied.
The Pv panels feed an all electric system: air-source heat pump, dry system-low temperature underfloor heating, hot water boiler and induction cooker. A home storage battery, smart grid connection and/or buffering though an electric car’s batteries supplies power for all other appliances and devices.
The construction system is based on dry construction and prefabrication so as to improve build quality and airtightness. Load bearing walls are constructed out of cross laminated timber, combining structural strength, freeform shape, insulation value, precision prefabrication and a ready finish surface in one component. Floors are wooden deck slab elements; roof and north wall are constructed out of SIPS panels clad in corrugated metal and cement fibre panels,providing a maintenance fee and easy to dismantle and recycle outer skin.