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Lobatse - Design Guidelines

For sustainable and comfortable buildings on the Lobatse Sez precinct, thousands of design iterations have been modelled. Due to the number of design combinations, it is not possible to document all compliant designs in the table Design Guides. Therefore, an online tool has is available to projects, to choose their own compliant designs. 

 

The tool, for different space types, can be found below.

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Dynamic design guideline graphs

Please note; loading the graph can take some minutes.

How to use the dynamic design guideline graph?

The PCG, a Parallel Coordinates Graph, is a powerful dashboard to assist in the design process. The PCG provides greater design freedom than the tables in Appendix A because the designs can be tested in a greater level of detail.

The PCG provides insight into the performance of the building design. For example;

  • Is it energy efficient?

  • What are the costs on concept level?

  • Is the building compliant with the Lobatse design criteria?

But is also provides design assistance the other way around. For example;

  • What designs for this building typology and orientation will be compliant?

  • How can I design this room for it to be comfortable without using air conditioning?

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The dynamic graph has multiple axes all positioned vertical, parallel to each other. Every line in the graph is one design with its unique combination of design input parameters. For each design, both axes with design input parameters (left) and design performance (right) are given. You can filter the graph; this can be done both by filtering "design input" as "design performance" results. For example; you can filter WWR to 20% and "Compliance to Yes", and this will show all compliant.

 

  • Filter the axis by click and drag the range you would like to filter.

  • Move the filter block by click and drag on the block.

  • Increase/decrease the filter block size by click and drag the top or bottom edge of the block

  • Remove the filter block by clicking on the axis above or below the filter box.

  • Reverse the axis by double-clicking on the axis

  • Move the axis; click and drag the axis left and right to move the axis.

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The graph shows many green lines. Every green line is one design configuration. Every design configuration has a value on the each axis showing the design input and the performance output. By filtering the results the performance for one design can be studied.

The following information is shown on the axis;

Design input:

 

  • Orientation:

    • North, East, South West

  • Zone (if applicable, typology dependant)

    • Building level top floor;
      corner space, middle pace.

    • Building level floor in between;
      corner space, middle pace.

    • Building level ground floor;
      corner space, middle pace.

  • Window-to-wall ratio (WWR)

    • 95% glazing, 65% glazing, 50% glazing, 35% glazing

  • Vertical Shading

    • No vertical shading, vertical fins, vertical fins high density, vertical fins high density rotated.

  • Horizontal shading

    • No horizontal shading, small, medium, or large overhang.

  • Roof

    • Sheet metal or concrete roof

    • 50mm or 135mm of insulation

  • Glazing

    • Single clear, single tinted, double clear, double tinted, double low-e

  • Wall

    • Double brick, double brick cavity, double brick with 30mm insulation

  • Ground floor insulation

    • No insulation, 30mm insulation

Design performance:

  • Tmax:

    • Maximum room operative temperature* during a year.

  • Tmin:

    • Minimum operative temperature during a year.

  • Days & hours > 27°C (value dependent on typology)

    • Upper comfort limit with no air flow.  Above this temperature, air flow, for example using fans, can be used to maintain comfort

  • Days & hours > 30.5°C  (value dependent on typology)

    • Upper comfort limit, with air flow.  Above this temperature, most occupants will be uncomfortable, even if fans are used.

  • Days & hours < 15°C

    • Lower comfort limit.  Below this temperature, most occupants will feel uncomfortably cool, even if wearing warm clothing.

  • Heating W/m2

    • The required heating capacity per floor area to keep the space comfortable during operation hours.

  • Heating kWh/m2

    • The required annual heating energy per floor area to keep the space comfortable during operation hours.

  • Cooling W/m2

    • The required cooling capacity per floor area to keep the space comfortable during operation hours.

  • Cooling kWh/m2

    • The required annual cooling energy per floor area to keep the space comfortable during operation hours.

  • Envelope costs

    • Concept level cost indication for construction costs of the design elements included in the design.

  • 15Yr costs

    • Concept level costs indication for construction costs of the design elements included in the design + 15x the annual energy required for heating and cooling when a heat pump is used.

  • Compliant

    • Is the design compliant? Only compliant designs are allowed on the Lobatse precinct.

Design variables used in the dynamic graphs

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