schofields public school

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Schofields Public School

Daylight Modelling Report

Prepared for: Prepared by:

Schofields Public School c/o – TKD Architects

Ray Leung Project No. 35677

P:\35677\PROJECT DOCUMENTATION\SUSTAINABILITY\GENERAL\ESD REPORT\SU-RE-ESD REPORT_004.DOCX

Date: 18 October 2018

Level 6, Building B, 207 Pacific Highway, St Leonards NSW 2065

T: (02) 8484 7000 F: (02) 8484 7100 E: [email protected] W: www.wge.com.au

Revision

REVISION P:\35677\PROJECT DOCUMENTATION\SUSTAINABILITY\GENERAL\ESD REPORT \SU-RE-ESD REPORT_004.DOCX

REVISION DATE COMMENT APPROVED BY

1 16/08/2018 Issue ALK

2 17/08/2018 Re-Issue ALK

3 10/10/2018 Amended Geometry Issue ALK

4 18/10/2018 Final Issue ALK

Contents

EXECUTIVE SUMMARY | i P:\35677\PROJECT DOCUMENTATION\SUSTAINABILITY\GENERAL\ESD REPORT \SU-RE-ESD REPORT_004.DOCX

EXECUTIVE SUMMARY 1

INTRODUCTION 2

DOCUMENTATION AND BUILDING FORM 3

MODELLING ASSUMPTIONS 5

Analysed Spaces 6

MODELLING RESULTS 7

Ground floor – Annual Daylight 7

First Floor – Annual Daylight level 8

Ground Floor - Special Education Unit 9

Ground Floor - HOMEBASE Type 4.1 11

Ground Floor – Learning Community Hub 13

Level 1 - Homebase Type 4 & Homebase Type 3 15

Ground Floor - Staff Room 18

CONCLUSION 20

Schofields Public School Masterplan

EXECUTIVE SUMMARY | 1

Executive Summary This report has been prepared for Tanner Kibble Denton Architects Pty Ltd for the proposed Schofields Public School (SPS) located at 60 St Albans Rd, Schofields, NSW 2762. The intent of this report is to provide response to Government Architect NSW – request of information (dated 29 May 2018) item 3.

Demonstrate through solar modelling diagrams that there will be adequate natural light levels to classroom spaces. Consider alternative locations for toilet blocks – away from the outdoor teaching areas at the ground floor of the main building.

A 3D dynamic daylight model has been established for the proposed development using SketchUp and Sefaira to produce solar modelling diagrams for analysis the natural light levels into the classroom spaces. The assessment utilises the recommended illuminances for classroom (400 Lux) as a reference lighting level and 0.7m desk height as the reference height referenced from the Australia Standard AS/NZS 1680.1:2006 Section 3.6 for analysing the level of daylight which can potentially be achieved to the selected areas. The solar modelling diagrams included in this report are as follows:

The percentage of time that the proposed building can achieved 400 lux of illuminance through natural daylight.

The illuminance lux levels for the critical classrooms on the following three representative days and times

- Winter solstice day at 21 of June (9am and 3pm) - Equinoxes day at 23 of September (9am to 3pm) - Summer solstice day at 21 of December (9am to 3pm)

This report analysed the solar modelling diagrams and summaries the following:

The solar modelling illustrated that all classrooms around the building façade can achieve a good level of illuminance throughout the analysed period (9am to 3pm).

The ground floor Learning Community hub and the Staff Room achieved a high level of illuminance via natural daylight during the analysed period (9am to 3pm).

Classrooms facing North East managed to capture natural daylight via the proposed skylights.

The toilet blocks to the east of the development which now have limited or negligible impact to the solar illuminance of the site when the proposed skylights is introduced.

Introduction

INTRODUCTION | 2

Introduction This report has been prepared for the Scholfields Public School located at 60 St Albans Rd, Schofields, NSW 2762. The report is to provide information on the performance of the building with respect to the levels of daylight which can be achieved in classroom spaces. Daylight simulation has been conducted utilising the modelling software packages “SketchUp 2017” and “Sefaira” to produce solar modelling diagrams for analysis the natural light levels to classroom spaces. Figure 1 below illustrate the project site and the proposed building location. The proposed building is a two storey building located at the North West corner with the main façades facing north east and north west. Building shade has been provided to the eastern and western sides by the building form to reduce solar heat gain and uncontrolled glare into the building. This will improve the occupant’s thermal comfort and reduce air-conditioning energy consumption. The design also proposed a series of skylights to balance the building performance between thermal comfort and natural daylight. The proposed skylights sizes and locations are shows in Figure 2.

Figure 1: Project Site and Proposed Building Location.

Figure 2: Proposed Skylights Location.

PROPOSED BUILDING

PROPOSED SKYLIGHTS

Documentation and Building form

DOCUMENTATION AND BUILDING FORM | 3

Documentation and Building form The daylight assessment was based on the following architectural drawings received from Tanner Kibble Denton Architects

The following figures illustrate the 3D model developed for daylight assessment. Shading devices and adjacent building have been applied to the east of the building as per the architectural drawings.

Figure 3: 3D modelling of Project – South West View

Documentation and Building form

DOCUMENTATION AND BUILDING FORM | 4

Figure 4: 3D modelling of Project – South East View

Figure 4: 3D modelling of Project – North East View

Modelling Assumptions

MODELLING ASSUMPTIONS | 5

Modelling Assumptions 1. The following glazing properties have been used for the daylight assessment. The glazing vision transmittance

(VLT) has been determined to achieve an optimum balance between daylight levels and shading potential. This is considered a conservative view for daylight assessment and it is expected that greater levels of light will enter the space as the glass is clearer.

Floor Surface Type VLT (%)

Ground Floor Glass 42%

First Floor Glass 42%

2. The Lux levels illustrated in all of the solar modelling diagrams are measured at the working plane, 0.7m above

the floor level as per the recommended desk height in Australia Standard AS/NSZ1680.1 2006. 3. The occupied hours for classrooms is assumed to be 9am to 3pm. 4. The study has focused on a number of selected main learning areas as detailed in Section 4.1 of this report.

Modelling Assumptions

MODELLING ASSUMPTIONS | 6

Analysed Spaces The diagrams below show the spaces chosen for specific analysis as are considered the high risk or representative sample of the development:

1.) Ground Floor – Special Education Unit 2.) Ground Floor – Homebase Type 4.1 3.) Ground Floor – Learning Community Hub 4.) Level 1 – Homebase Type 4 5.) Level 1 – Homebase Type 5 6.) Ground Floor – Staff Room

It is noted that number 6 is not a teaching space. The entire school’s layout was analysed at high level.

Modelling Results

MODELLING RESULTS | 7

Modelling Results Ground floor – Annual Percentage of Occupied Hours with Daylight Level more

than 400 LUX

The solar diagram above illustrated the percentage of occupied hours that the lighting level on the ground floor classrooms can achieve more than 400 lux through natural daylight. Classrooms on the eastern side (boxed in red on the diagram above) still managed to achieve a high percentage of time receiving natural daylight more than 400 Lux via the proposed skylights when the façade is shaded heavily by the building form and with the obstruction of the toilet blocks. Staff Room and the Learning Community Hub areas perform the best with a sizable portion of the floor area achieving 400 lux more than 60% of the time.

Modelling Results


First Floor – Annual Percentage of Occupied Hours with Daylight Level more than 400 LUX

The solar diagram above illustrated the percentage of occupied hours on the first floor classrooms that the lighting level can achieved more than 400 lux through natural daylight. Although the solar diagram illustrated the classrooms facing northwest achieved a higher percentage of time receiving natural lighting than the classrooms facing north east due to the orientation and shading provide to the north eastern side, however the classrooms facing northeast (boxed in red above) still manage to receive a good level of natural lights via the proposed skylights.

Modelling Results


Ground Floor - Special Education Unit The special education unit on ground floor has excellent shading to the East and West through the covered outdoor areas. It also achieves natural cross ventilation through its design. Due to these benefits however the amount of daylight can be limited at times of the year.

Winter Solstice (21 June – 9am) Winter Solstice (21 June – 3pm)

Modelling Results


Equinoxes (23 September – 9am) Equinoxes (23 September – 3pm)

Summer Solstice (21 December – 9am) Summer Solstice (21 December – 3pm)

From the result above, although the Special Education Unit room only receive good level of illuminance along the perimeter of the room, but a steady level of natural daylight still can be received to the north east area via the proposed skylights.

Modelling Results


Ground Floor - HOMEBASE Type 4.1


Modelling Results




For the Ground floor Homebase type 4.1, the result shows that a high level of illuminance is achieved through natural daylight on the perimeter area of the room throughout different times and periods.

Modelling Results


Ground Floor – Learning Community Hub The community learning hub on ground floor receives excellent levels of daylight throughout the year. It has large eastern and western facades that capture good levels of light deep into the space. It is also unencumbered by shading devices overshadowing the space.


Modelling Results




For the Learning Community Hub area, the result shows that the area achieved a high level of luminaries from the natural daylight covering most of the floor area throughout the day and year. It can be seen the light manages to make its way through the entire space in summer mornings.

Modelling Results


Level 1 - Homebase Type 4 & Homebase Type 3 The level 1 north space received high levels of daylight throughout the perimeter spaces during the anlaysed period. It can be seen that along the northern and western edges of the spaces, daylight entrance to the space is quite significant. This is true even with the shading included on the north of the building. Daylight enter the space from 12pm to 3pm managed to cover more than 50% of the classroom facing north throughout the year.

Modelling Results




Modelling Results



The solar diagrams above illustrated for both homebase type 4 and type 3 received more natural daylights in the afternoon than in the morning throughout the analysed periods. The orientation shows significant light entering the space predominantly along the Western façade. This is due primarily to its orientation. The space receives limited direct daylight during the morning.

Modelling Results


Ground Floor - Staff Room


Modelling Results




From the solar modelling diagrams above, the staff room at ground floor received more natural daylight in the afternoon than in the morning throughout the analysed periods.

Conclusion

CONCLUSION | 20

Conclusion The daylight simulation analysis has been conducted to show the level of natural daylight present in the proposed development for Schofields Public School at the times nominated. In most scenarios on the ground floor, poor performing spaces have been selected, which do not accurately represent the overall performance of the space. The solar modelling illustrated that all classrooms around the building façade can achieve a good level of illuminance throughout the year. The result also shows that the ground floor Learning Community hub achieved a high level of illuminance via natural daylight covering most of the floor area during the analysed period (9am to 3pm). Classrooms facing North East managed to capture natural daylight via the proposed skylights. The proposed building has been designed so that an optimum balance can be achieved between the daylight levels to the classrooms and the environmental impact on energy as well as the occupant’s comfort level.

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