This new standard requires all new buildings to be nearly Zero Energy Buildings (nZEB) by 31st December 2020 and all buildings acquired by public bodies by 31st December 2018.
“‘We are being weaned off our addiction to oil and gas heating systems by a combination of building control regulations and incentives, but there is a low level of awareness about the recent amendments to Part L of the Building Regulations. Nearly Zero Energy Buildings’ means a building that has a very high energy performance. The nearly zero or very low amount of energy required should be covered to a very significant extent by energy from renewable sources, including energy from renewable’s produced on-site or nearby.”
The Nearly Zero Energy Buildings standard (nZEB) is being implemented in Ireland through Building regulations Technical Guidance Document Part L – Conservation of Fuel and Energy – Dwellings 2018. It comes into force on 1st April 2019. To eliminate the potential for doubt around interpretation, the commission has defined actual kWh/m2y targets for nZEB, in our climate zone, for two sample building types: 40-55 kWh/(m2y) of net primary energy for offices, and 15-30 kWh/(m2y) for new single-family dwellings.
What does this mean for commercial and non-residential building design?
A combination of some of the followings is likely needed to achieve a 60% improvement.
- Building insulation levels greatly improved.
- Glazing ratios may need to be considered.
- Renewables will need to cover a substantial part of energy use.
- Enhanced calculation of linear thermal bridging required.
- The insulation value of the glazing itself will be considerably improved.
- Airtightness standards are being introduced including mandatory airtightness test on every building.
- The use of renewables and free cooling of up to 20% of final demand. (not including plug loads).
- The use of solar shading will need to be considered.
- Much more efficient LED lighting and services will be needed.
Are you nZEB ready? Call Midland Solar today for a free Solar PV quote.