OVERVIEW OF CHANGES IN HOMESTAR

Transcription

1 OVERVIEW OF CHANGES IN HOMESTAR Alex Cutler New Zealand Green Building Council November 2015

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3 Terrace dwellings and apartments

4 The issue Certain credits in the previous version of Homestar were not able to adapt to the unique requirements of multi unit developments

5 Standalone existing dwellings to terraced houses

6 and apartments

7 Homestar v3

8 The Homestar process Appraise Design Built

9 CHANGE Modification of admin and audit fee Review of certain credits Introduction of a Density Factor Move to simplified excel based calculators and established 3 rd party apps Modelling pathway

10 Admin and audit Base work - project Admin work number of dwellings Audit work number of typologies Energy modelling ($300) Innovation ($200) PIs ($200) CIRs ($200) Typology = GFA, Floor area, window area on each orientation, wall area on each orientation, ceiling area (all +/-10%), RAF does not change.

11 Energy, Health & Comfort EHC-1: Space Heating EHC-5: Renewables EHC-6: Whole House Thermal Performance EHC-11 Natural Lighting

12 Water WAT-1: Rainwater Harvesting Site STE-1: Stormwater Management STE-4: Transport (now Site Selection) STE5: Outdoor common area facilities

13 EHC-1: Space Heating Pathway 1: Excel space heating calculator Pathway 2: Energy modelling

14 EHC-5: Renewables Common area electrical demand

15 EHC-6: Thermal Performance Points awarded on calculated kwh/m2/yr for combined heating and cooling EHC-6 Calculator replaced with online ALF Floor area/perimeter calculation clarified Cooling load included Energy modelling

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17 EHC-11: Natural Lighting Daylight Factor or illuminance levels for kitchens and living areas. Prove by calculation or modelling or onsite measurements.

18 WAT-1:Rainwater Harvesting New calculator Three points for rainwater collection Three points for rainwater reuse Capacity check, points prorated Common area water demand

19 MAN-1:Unwanted Features Name change from miscellaneous Mechanical cooling removed (now covered in EHC-6) Has become a negative credit i.e. Points are deducted for each feature present Only applicable to existing houses

20 STE-1, 4, 5 1 point removed from STE-1 for apartments 1 point added to STE-4 STE-4 also now looks at Previous development STE-5 Outdoor common area facilities Applicable for Apartments

21 MAT-1,2 Recognized eco labels now in line with Green Star Simplified Calculator awards points jointly for MAT-1 (Site Selection) and MAT-2 (VOC and Toxic materials)

22 Density Factor RAF = DF * DRAF RAF = Resource Adjustment Factor DF = Density Factor DRAF = Dwelling Resource Adjustment Factor

23 Homestar Calculator and Scorecard

24 Review and launch Homestar v3 Launched: 12 th Nov 2015

25 Concrete and Homestar Thermal mass critical to home thermal performance Dense building material able to store heat and release it to the living space slowly useful for passive design Passive House designs get full points for EHC-1 and 6 (21 out of 100 raw points)

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30 A hydroponic underfloor heating system where pipes under the driveway absorb passive heat and pump hot water to the underfloor heating system Photovoltaic (PV) energy system and solar hot water (any excess solar energy is used to heat the tank that supplies underfloor heating) A smart home system that turns on appliances (e.g. dishwasher and washing machine) during off-peak energy periods, when occupants are out and the PV capacity is high Fully insulated concrete slab edge to minimise heat loss Wider 140 mm exterior framing, to allow room for extra insulation that exceeds NZ Building Code standards Rainwater harvesting and greywater recycling system Leak detection system that shuts off water automatically when there s a leak or tap left running A Lifemark 5 star rating for safety and accessibility, future-proofing the home During the build period, a strict waste management plan and a recycling programme will reduce the amount of waste sent to landfill.

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35 The home features: Combined grey water and rainwater system Water-efficient fittings Photovoltaic solar power and energy-efficient lighting and electrics All paints and sealants are low VOC, and other materials are certified by Environmental Choice NZ or Forest Stewardship Council A solar wall ventilation system uses the sun s energy to preheat ventilation air, substantially reducing heating expenses Slab-edge insulation (to stop heat loss from concrete floor slabs) and innovative hydronic underfloor heating also keep the home snug A high-performance thermal envelope includes external wall frames that are least 140mm thick and provide resistance to wind and earthquake loads that far exceeds Building Code requirements.