The challenge of a net zero energy home in Central Otago – currently at design phase –is primarily one of maintaining thermal comfort throughout the temperature range between 35°C in summer and -10°C in winter. Our solution has R 6.0 and R7.0 insulation in walls and roof respectively, double glazed airlocks and a rockbin for thermal harvesting and storage. The 32° north facing roof covering the 100 sq.m 2 bedroom home is ideal for summer photo voltaic generation and loses only a few % efficiency in winter by not being normal to the midday sun in winter. Since the main electricity load will be refrigeration, lighting and computers, rather than for heating, that is a minor disadvantage only. The roof carries solar water panels also. Any prolonged period without sun will made up for with a wetback on the small space heating woodstove. More on this evolving design to come…..
Nett Zero Box
Portfolio Categories: Work in progress.