H1/VM1
H1/VM1 Modelling on Speckel
Verification Method H1/VM1 is a part of the New Zealand Building Code. It provides a performance-based alternative to meeting the requirements of Clause H1, which specifies the minimum energy efficiency standards that buildings in New Zealand must meet.
Our Verification Method H1/VM1 modelling approach is unique, where the reference building model and reporting are automated. This approach saves significant time and effort, enabling design optimisation to be the focal point. A typical office building is simulated in less than an hour, including simulations and results.
The H1/VM1 Checklist
The following comprehensive review checklists provide a method to verify a model against all H1/VM1 modeling principles, as per Appendix D - Modelling method β Building energy use comparison.
Modelling Principles, Software and Default Values
Clause | Requirement | Yes/No/N/A |
---|---|---|
D.1.2.1 | Are the proposed building and reference building analysed using the same techniques and assumptions? | |
D.1.2.2 | Are the specifications of the proposed building in the analysis as similar as reasonably practicable to the submitted plans? | |
D.1.2.3 | Does the reference building have the same number of storeys, floor area for each storey, orientation, and geometric form as the proposed building? | |
D.1.2.3 | Are the floors that form part of the thermal envelope of the same type in both the reference building and the proposed building? | |
D.1.2.4.a | Are the wall construction R-value and thermal mass accounted for accurately in both buildings? | |
D.1.2.4.b | Are the floor construction R-values accounted for accurately in both buildings? | |
D.1.2.4.c | Are the roof construction R-value and thermal mass accounted for accurately in both buildings? | |
D.1.2.4.d | Are the window, door, and skylight sizes, orientations, construction R-values, SHGC, and shading devices accounted for accurately? | |
D.1.2.4.e | Are the heating, cooling, and ventilation plant sizes accounted for accurately in the models? | |
D.1.2.5 | Is it acknowledged that the results of the thermal modeling are not a guarantee of the actual energy use of the building? | |
D.1.3.1 | Does the software pass the ANSI/ASHRAE Standard 140 test or BESTEST as appropriate? | |
D.1.4.1 | Are the default values and schedules from this appendix used unless demonstrated otherwise? | |
D.1.4.1 | Are any modifications to default assumptions used in both the proposed building and the reference building simulations? | |
D.1.4.2 | Are other aspects of the buildingβs performance, for which no default values are provided, stated and simulated identically for both buildings? | |
D.1.4.3.a | Are heating, set-points, and schedules modeled identically for both buildings? | |
D.1.4.3.b | Are cooling, set-points, and schedules modeled identically for both buildings? | |
D.1.4.3.c | Are ventilation, set-points, and schedules modeled identically for both buildings? | |
D.1.4.3.d | Are fresh air ventilation, air change rates, and schedules modeled identically for both buildings? | |
D.1.4.3.e | Are internal gains loads and schedules modeled identically for both buildings? | |
D.1.4.3.f | Are occupancy loads and schedules modeled identically for both buildings? | |
D.1.4.3.g | Are the location and R-values of carpets and floor coverings modeled identically for both buildings? | |
D.1.4.3.h | Is incidental shading modeled identically for both buildings? |
Climate and Thermal Zones
Clause | Requirement | Yes/No/N/A |
---|---|---|
D.1.5.1 | Are both the proposed building and the reference building modeled using the same climate data? | |
D.1.5.1 | Is the climate data from a weather station that best represents the climate at the building site? | |
D.1.5.1 | Does the climate data represent an average year for the site, over at least a 10-year period? | |
D.1.6.1 | For multi-unit dwellings, are both buildings divided into separate thermal zones, with each household unit represented by at least one thermal zone? | |
D.1.6.2 | For other buildings, are both buildings divided into separate thermal zones if the software allows? | |
D.1.6.3 | Are spaces with significantly different space conditioning requirements modeled as separate zones? | |
D.1.6.4 | Is the conditioned space divided into a minimum of three thermal zones? | |
D.1.6.5 | Are roof spaces and enclosed subfloor spaces modeled as thermal zones? | |
D.1.6.6 | Does the model represent internal conductive heat flows between thermal zones? | |
D.1.6.6 | Are internal partitions between thermal zones modeled with their location, surface area, pitch, and construction R-value described? | |
D.1.6.7 | Are the same internal partitions modeled in both the proposed building and the reference building? | |
D.1.6.8 | Are internal partitions within a thermal zone, which may affect the thermal performance of the building, modeled? | |
D.1.6.9 | Is airflow between thermal zones modeled, if desired? |
Adjoining Spaces, Thermal Mass, Shading and Infiltration
Clause | Requirement | Yes/No/N/A |
---|---|---|
D.1.7.1 | Are building elements that separate adjoining conditioned spaces assumed to have no heat transfer? | |
D.1.7.2 | Are building elements separating conditioned space from adjacent unconditioned space modeled with a construction R-value 0.5 higher than actual and zero solar absorptance? | |
D.1.8.1 | Is the thermal mass modeled either the same for both buildings or as lightweight for the reference building? | |
D.1.9.1 | Is the thermal mass of the contents the same for both models and regarded as zero? | |
D.1.10.1 | Are floor coverings modeled as proposed for both buildings, with ceramic tiles in wet areas and carpet in others if unspecified? | |
D.1.11.1 | Is exterior shading modeled as proposed in the proposed building, but not in the reference building? | |
D.1.11.2 | Is no account taken of internal shading devices like blinds or drapes? | |
D.1.12.1 | Is shading by structures and terrain that affect the building modeled the same way for both buildings? | |
D.1.12.2 | Is no account taken of trees or vegetation for shading? | |
D.1.13.1 | Are infiltration assumptions the same for both buildings and reasonable for the construction, location, and use? |
Thermal Envelope
Clause | Requirement | Yes/No/N/A |
---|---|---|
D.2.1.1 | Are all building elements described in terms of surface area, orientation, pitch, and construction R-value, with glazing areas having their SHGC specified? | |
D.2.1.2 | Is the solar absorption of external building elements modeled as proposed in both buildings, or as 0.5 if not specified? | |
D.2.1.3 | When the modeling program calculates and adds its own surface resistances, are the input resistances adjusted by subtracting the standardised surface resistances? | |
D.2.1.4.a | In the reference building, is any slab-on-ground floor modeled with a construction type from Tables F.1.2.2A to F.1.2.2X, meeting or exceeding the minimum R-value? | |
D.2.1.4.b | In the proposed building, does any slab-on-ground floor with embedded heating systems meet the construction R-value in Table 2.1.2.2A? | |
D.2.2.1 | If the glazing area in the proposed building is more than 30% of the total wall area, is the glazing area of the reference building 30% of the total wall area? | |
D.2.2.2 | If the glazing areas in the proposed and reference buildings are different, is the glazing area in the reference building either distributed evenly or resized proportionally? | |
D.2.3.1 | In the reference building, is the skylight area set to zero? | |
D.2.4.1.a | In the reference building, does the opaque door area that is no more than either 6 mΒ² or 6% of the total wall area have the same or higher construction R-value as the reference building windows? | |
D.2.4.1.b | In the reference building, does any remaining opaque door area have the same construction R-value as the reference building wall? |
Space Conditioning and Internal Loads
Clause | Requirement | Yes/No/N/A |
---|---|---|
D.3.1.1 | For housing, is a minimum temperature of 18Β°C and a maximum temperature of 25Β°C modeled, with natural ventilation at 24Β°C if outdoor air temperature is lower? | |
D.3.1.1 | For housing, is the ventilation rate reasonable for the available venting area and the same for both the proposed and reference buildings? | |
D.3.1.2 | For buildings other than housing, is a minimum temperature of 18Β°C and a maximum temperature of 25Β°C from 8am to 6pm, five days a week, modeled unless otherwise justified? | |
D.3.2.1 | Is the fresh air ventilation rate and schedule the same for both the proposed and reference buildings? | |
D.3.2.1.a | For housing, is the minimum fresh air ventilation rate 0.5 air changes per hour? | |
D.3.2.1.b | For other buildings, is the minimum fresh air ventilation rate as specified in NZS 4303? | |
D.3.3.1 | Is the calculation of annual loads for space heating and cooling done without simulating equipment, or is it the same for both buildings if simulated? | |
D.4.1.1 | If lighting is modeled, is it the same for both the proposed building and the reference building? | |
D.4.2.1 | For domestic hot water, is the power density for an internal cylinder either ignored or the default value from Table D.5.1.1 used? | |
D.4.3.1.a | Are default values for heat release from occupants and plug loads used for housing as specified in Table D.5.1.2A? | |
D.4.3.1.b | Are default values for heat release from occupants and plug loads used for communal residential as specified in Table D.5.1.2B? | |
D.4.3.1.c | Are default values for heat release from occupants and plug loads used for communal non-residential assembly care as specified in Table D.5.1.2C? | |
D.4.3.1.d | Are default values for heat release from occupants and plug loads used for commercial buildings as specified in Table D.5.1.2D? | |
D.4.3.2 | Are these default values used unless other suitable parameters specific to the buildingβs use are shown to be more appropriate? | |
D.4.3.3 | Are unconditioned spaces assigned zero internal gains? | |
D.4.4.1 | Are process loads defined as those heat loads that result from the production of goods within a building? | |
D.4.4.2 | Are process loads modeled only if they are significant and will continue for the expected life of the building, and are they the same in both buildings? |
Reference Building and Documentation
Clause | Requirement | Yes/No/N/A |
---|---|---|
D.5.1.1 | Are the default power densities for internal gains from occupants and plug loads used as specified in Table D.5.1.1? | |
D.5.1.2.a | Are the default schedules for occupancy and plug loads for housing used as specified in Table D.5.1.2A? | |
D.5.1.2.b | Are the default schedules for occupancy and plug loads for communal residential used as specified in Table D.5.1.2B? | |
D.5.1.2.c | Are the default schedules for occupancy and plug loads for communal non-residential assembly care used as specified in Table D.5.1.2C? | |
D.5.1.2.d | Are the default schedules for occupancy and plug loads for commercial buildings used as specified in Table D.5.1.2D? | |
D.6.1.1.a | Does the documentation of computer modeling analysis include the name of the modeler? | |
D.6.1.1.b | Does the documentation include the thermal modeling program name, version number, and supplier? | |
D.6.1.1.c | Does the documentation include technical detail on the proposed building and reference building designs and their differences? | |
D.6.1.1.d | Does the documentation include the sum of the heating load and cooling load for the proposed building and reference building? | |
D.6.1.1.e | Where possible, does the documentation include the separate heating load and cooling load for the proposed building and the reference building? |
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