daylight modelling report 720-722 high st, glen waverley, vic · daylight modelling report 720-722...

Daylight Modelling Report

720-722 High St, Glen Waverley, VIC

Mixed use development

Prepared for Jesse Ant Architects

14th November 2018

e: [email protected]

p: 03 9016 9486

a: Suite 7, 252 St Georges Rd, Fitzroy North Vic 3068

Low Impact Development Consulting

www.lidconsulting.com.au

© Low Impact Development Consulting Page | 1

Table of Contents 1. Executive Summary .......................................................................................................................... 2

2. Introduction ........................................................................................................................................ 2

2.1. Scope ...................................................................................................................................... 2

2.2. Framework Adopted ............................................................................................................ 2

2.3. Documentation & Drawings ............................................................................................... 3

2.4. Software .................................................................................................................................. 3

3. Inputs ................................................................................................................................................... 3

3.1. Modelling Conditions ........................................................................................................... 3

3.1.1. Built Form ................................................................................................................... 3

3.1.2. Sky Model .................................................................................................................. 3

3.1.3. Orientation ................................................................................................................ 4

3.2. Surrounding Conditions ....................................................................................................... 4

3.3. Material Assumptions ........................................................................................................... 4

4. Results .................................................................................................................................................. 4

5. Conclusion .......................................................................................................................................... 5

Appendix 1. Assessment Framework ................................................................................................ 6

Appendix 2. Daylight Modelling Results ........................................................................................... 8


1. Executive Summary A daylight assessment has been undertaken to assess the proposed development’s daylight

performance against council’s Best Practice standard for daylight ingress. The assessment

utilises multiple assessment methods including the BESS deemed to satisfy (DTS) pathway,

BESS in-built calculator and daylight modelling. Results are shown in Table 1 below:

Table 1 - Summary of Results

% Compliance Deemed to Satisfy (DTS)

Deemed to Satisfy

(DTS) + BESS in-built

calculator

Deemed to Satisfy


calculator +

modelling

Bedrooms 98% 100% 87%

Living Areas 87% 100% 100%

The DTS daylight results demonstrate that at least 87% of living areas and 98 of bedrooms are

able to meet the BESS daylight requirements when assessed against Deemed to Satisfy (DTS).

A further 2% of bedrooms and 13% of living areas were able to meet the BESS requirements

through the in-built calculator.

Daylight modelling has been undertaken on bedrooms facing the internal light-court of the

proposed development in response to council concern over the internal amenity of these

rooms. Out of the 11 bedrooms facing the internal light-court, 3 bedrooms achieve a

daylight factor of 0.5% for at least 90% of the floor area.

With the 8 bedrooms not achieving the required daylight factor discounted from the DTS and

in-built calculator results, the development achieves 87% of bedrooms meeting the required

daylight factor. With consideration of these results, the proposed development achieves

council’s Best Practice standard for daylight for both living rooms and bedrooms.

2. Introduction

2.1. Scope

Low Impact Development Consulting was engaged to perform a daylight analysis of the

proposed development. The following report encompasses the modelled daylight analysis,

illustrating the performance of bedrooms facing the internal light-court against council’s Best

Practice standard for natural daylight provision.

2.2. Framework Adopted

Monash City Council’s ‘Best Practice Standard’ for natural daylight provision has been

adopted in line with the Best Practice standard presented within the ‘Built Environment

Sustainability Scorecard (BESS)’ as well as the ‘Indoor Environmental Quality’ Sustainable

Design Assessment in the Planning Process (SDAPP) factsheet.

The BESS Best Practice standard enables a ‘Deemed to Satisfy’ (DTS) method of compliance

which has been utilised as the primary daylight assessment method for this development.

Modelling has been undertaken to provide further detail on daylight ingress to a small

sample of bedrooms, including all bedrooms facing internal light-courts.


2.3. Documentation & Drawings

The drawing set forming the basis of this daylight assessment was provided by Jesse Ant

Architects on the 23rd of October, 2018.

2.4. Software

The software utilized for this assessment is DesignBuilder V5.3.0.008 (latest, released 2018)

which encompasses a suite of building performance simulation tools including daylight

modelling. The modelling conditions adopted are detailed within section 3.1.

3. Inputs

3.1. Modelling Conditions

3.1.1. Built Form

All aspects of the basic building form have been modelled, with specific glazing details

applied to the focus area of the internal light-court, per the architectural drawings cited.

Figure 1 – Built Form

3.1.2. Sky Model

The simulation sky model used throughout all modelling scenarios is the CIE overcast day sky

model, with a zenith illuminance input of 10,000lux.


3.1.3. Orientation

Under the CIE overcast day sky model, illuminance is consistent across all orientations

(azimuth), gradually reducing across the zenith.

3.2. Surrounding Conditions

As the modelling assessment is limited to daylight ingress to the internal light-court facing

bedrooms, adjoining buildings have not been modelled (no impact anticipated).

3.3. Material Assumptions

Relevant materials reflectance’s are as follows:

• Internal wall reflectance 0.7 (white plasterboard);

• Internal ceiling reflectance 0.8 (white plasterboard);

• Internal and floor reflectance 0.3 light timber or carpet);

• External wall reflectance 0.5 (white wall);

Visible Light Transmittance (VLT%) of glazing is as follows:

• External windows VLT=0.70 (clear double glazing);

4. Results Compliance against the BESS Best Practice standard for natural daylight provision through a

Deemed to Satisfy approach has been achieved for 98% of bedrooms within the proposed

development. The daylight modelling results indicate that the 3 of the 11 (27%) bedrooms

facing the internal light court achieve 0.5% daylight factor for >=90% of the floor area. The

overall compliance of the development is 87% for bedrooms.

The daylight assessment indicates that the proposed development achieves compliance

with the BESS Best Practice daylight framework for living areas, with 87% of living areas

complying with the BESS DTS requirements. This result, combined with the BESS in-built

calculator results, provides overall 100% compliance for living areas within the development.

A summary of results is shown in Table 2 below.

Table 2 - Summary of Results

% Compliance Deemed to Satisfy (DTS)

Deemed to Satisfy


calculator

Deemed to Satisfy


calculator +

modelling

Bedrooms 98% 100% 87%

Living Areas 87% 100% 100%

Daylight graphs for all modelled bedrooms of the proposed development are shown in

Appendix 2.

A summary of the achieved daylight compliance, through each separate pathway, for each

habitable room within the proposed development, can be found in Appendix 3.


5. Conclusion Daylight assessment of the proposed development indicates that the BESS Best Practice

daylight framework will be met, with >80% of bedrooms and >80% of living rooms complying

with the BESS daylight criteria. It was demonstrated through combination of BESS DTS, in-built

calculator, and modelling that 87% of bedrooms and 100% of living rooms meet the BESS Best

Practice daylight criteria.

Note, daylight ingress measured within the daylight modelling assessment are dependent on

the architectural design, glazing, finishes values and surrounding conditions as specified

within. Deviation from these values will result in differing daylight levels.


Appendix 1. Assessment Framework Built Environment Sustainability Scorecard (BESS) online tool notes1

1.1 - Daylight Access - Living Areas

Applies to

All residential development

Objective

To provide a high level of amenity and energy efficiency through design for natural light.

Summary

Points are awarded where at least 80% of the total number of living rooms achieve a daylight

factor greater than 1% to 90% of the floor area of each living area, including kitchens.

Additional points are awarded where 100% of dwellings comply. This can be demonstrated

by using the in-built BESS daylight calculator or by alternative daylight modelling where the

alternative methodology is accepted by Council.

Documentation & evidence required

If using the BESS daylight calculator:

• References to floor plans and elevations showing window sizes and sky angles

If using an alternative daylight modelling program:

• A short report detailing assumptions used and results achieved.

Other Considerations

• Daylight modelling using third party software may be more appropriate than the BESS

daylight calculator where neighbouring properties are too close to allow for vertical

sky angle to be calculated.

• Lightly coloured materials will improve reflectivity. Consider using lightly coloured

materials surfaces near windows, such as window sills and jambs.

• Specify glazing with high Visual Light Transmittance (VLT) and combine this with

shading systems such as blinds, overhangs or retractable awnings, rather than using

heavily tinted glass.

• Light shelves can increase daylight penetration by 'bouncing' light deeper into a

room

• The BESS daylight calculator only works for rooms which have a single aspect only (i.e.

1 window to the space) as rooms with more than one aspect are deemed to have

adequate daylight

1 Built Environment Sustainability Scorecard 2017, Council Alliance for a Sustainable Built

Environment, accessed 22 August 2017, <http://www.bess.net.au/tool-notes/>


1.2 - Daylight Access - Bedrooms

Applies to

All multi-residential development

Objective

To provide a high level of amenity and energy efficiency through design for natural light.

Summary

Points are awarded where at least 80% of the total number of bedrooms achieve a daylight

factor greater than 0.5% to 90% of the floor area in each room. Additional points are

awarded where 100% of dwellings comply. This can be demonstrated by using the in-built

BESS daylight calculator or by alternative daylight modelling where the alternative

methodology is accepted by Council.

Documentation & evidence required

If using the BESS daylight calculator:

• References to floor plans and elevations showing window sizes and sky angles

If using an alternative daylight modelling program:

• A short report detailing assumptions used and results achieved.

Other Considerations

• Daylight modelling using third party software may be more appropriate than the BESS

daylight calculator where neighbouring properties are too close to allow for vertical

sky angle to be calculated.

• Lightly coloured materials will improve reflectivity. Consider using lightly coloured

materials surfaces near windows, such as window sills and jambs.

• Specify glazing with high Visual Light Transmittance (VLT) and combine this with

shading systems such as blinds, overhangs or retractable awnings, rather than using

heavily tinted glass.

• Light shelves can increase daylight penetration by 'bouncing' light deeper into a

room


Appendix 2. Daylight Modelling Results Bedroom Numerical Results:

Block Zone Floor Area above Threshold (%)

0 002 Bed 2 16.19

0 003 Bed 2 17.62

0 004 Bed 2 15.24

0 005 Bed 2 15.71

1 102 Bed 2 65.47

1 103 Bed 2 62.11

1 104 Bed 2 63.55

1 105 Bed 2 77.43

2 202 Bed 1 96.3

2 203 Bed 1 98.14

2 204 Bed 2 95.58


Daylight maps are as follows, with coloured area indicating daylight levels above relevant

daylight factor (DF) threshold (0.5% for bedrooms).

Ground floor daylight map:


First floor daylight map:


Second floor daylight map:


Daylight factor scales:

Living room scale: Bedroom scale:


Appendix 3. Summary of Daylight Compliance

Level Apartment Zone DTS In-built

Calculator Modelling

Overall BESS Compliance

G 1 Living Y Y - Y

G 1 Bed 1 Y Y - Y

G 1 Bed 2 Y Y - Y

G 1 Bed 3 Y Y - Y

G 2 Living Y Y - Y

G 2 Bed 1 Y Y - Y

G 2 Bed 2 Y Y N N

G 3 Living Y Y - Y

G 3 Bed 1 Y Y N N

G 3 Bed 2 Y Y - Y

G 4 Living Y Y - Y

G 4 Bed 1 Y Y - Y

G 4 Bed 2 Y Y N N

G 5 Living Y Y - Y

G 5 Bed 1 Y Y - Y

G 5 Bed 2 Y Y N N

G 6 Living Y Y - Y

G 6 Bed 1 Y Y - Y

G 6 Bed 2 Y Y - Y

G 6 Bed 3 Y Y - Y

G 7 Living Y Y - Y

G 7 Bed 1 Y Y - Y

G 7 Bed 2 N Y - Y

G 8 Living N Y - Y

G 8 Bed 1 Y Y - Y

G 8 Bed 2 Y Y - Y

G 9 Living N Y - Y

G 9 Bed 1 Y Y - Y

G 9 Bed 2 Y Y - Y

1 1 Living Y Y - Y

1 1 Bed 1 Y Y - Y

1 1 Bed 2 Y Y - Y

1 2 Living Y Y - Y

1 2 Bed 1 Y Y - Y

1 2 Bed 2 Y Y N N

1 3 Living Y Y - Y

1 3 Bed 1 Y Y - Y

1 3 Bed 2 Y Y N N

1 4 Living Y Y - Y

1 4 Bed 1 Y Y - Y


1 4 Bed 2 Y Y N N

1 5 Living Y Y - Y

1 5 Bed 1 Y Y - Y

1 5 Bed 2 Y Y N N

1 6 Living Y Y - Y

1 6 Bed 1 Y Y - Y

1 6 Bed 2 Y Y - Y

1 7 Living Y Y - Y

1 7 Bed 1 Y Y - Y

1 7 Bed 2 Y Y - Y

1 8 Living N Y - Y

1 8 Bed 1 Y Y - Y

1 8 Bed 2 Y Y - Y

1 9 Living N Y - Y

1 9 Bed 1 Y Y - Y

1 10 Living Y Y - Y

1 10 Bed 1 Y Y - Y

1 10 Bed 2 Y Y - Y

2 1 Living Y Y - Y

2 1 Bed 1 Y Y - Y

2 1 Bed 2 Y Y - Y

2 2 Living Y Y - Y

2 2 Bed 1 Y Y Y Y

2 2 Bed 2 Y Y - Y

2 3 Living Y Y - Y

2 3 Bed 1 Y Y - Y

2 3 Bed 2 Y Y Y Y

2 4 Living Y Y - Y

2 4 Bed 1 Y Y - Y

2 4 Bed 2 Y Y Y Y

2 5 Living Y Y - Y

2 5 Bed 1 Y Y - Y

2 5 Bed 2 Y Y - Y

2 6 Living Y Y - Y

2 6 Bed 1 Y Y - Y

2 6 Bed 2 Y Y - Y

2 7 Living Y Y - Y

2 7 Bed 1 Y Y - Y

2 7 Bed 2 Y Y - Y

2 8 Living Y Y - Y

2 8 Bed 1 Y Y - Y

3 1 Living Y Y - Y

3 1 Bed 1 Y Y - Y

3 1 Bed 2 Y Y - Y

3 2 Living Y Y - Y


3 2 Bed 1 Y Y - Y

3 2 Bed 2 Y Y - Y

3 3 Living Y Y - Y

3 3 Bed 1 Y Y - Y

3 3 Bed 2 Y Y - Y

3 4 Living Y Y - Y

3 4 Bed 1 Y Y - Y

3 4 Bed 2 Y Y - Y

3 5 Living Y Y - Y

3 5 Bed 1 Y Y - Y

3 5 Bed 2 Y Y - Y

daylight modelling report 720-722 high st, glen waverley, vic · daylight modelling report 720-722...

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