Target

• A DF of 10% will always stop people turning on lights
• A DF of 3% is deemed "adequate"
• Target: 5% to most of the floor.
• But: minimise glare, moderate window sizes

Method

• Ecotect and Radiance
• Basic export from Revit (use VG to shown only walls
• Trace one big zone in ecotect and add partitions. Use custom custom to set "default" reflectacces
• Save the GRD files
• Use a standard grid: 2 - 12, and BLUE-GREEN-RED and clip out <2

Results

Blackbox

Don't be a muppet. Do a blackbox first. You can't see the scale, but the maximum is 0.1 DF (ie. close to zero), so we have a sealed box.

Looking good: <1% DF if there are black windows

First Run

• VLT 70% (ie. frame + 80% glass)
• Patio is 50% nominal - see below for more work on this.

1. Ok, so KLD (top right) is good. The east (RHS) corner could use a bit more. Currently the windows is 1500W, so try a 1800W
2. The hallway is shit: add the top light (2500x900 splashback + 2500x450 high level)
3. The entry (top left)  need fixing. Add glass door.
4. The bedrooms are all similiar. They are around 5% DF but dimmer in parts. Try 1800W windows.

Results

The changes above were incorporated (all 4). The results (ie photos and impressions, and maybe a light meter test) to be added.

Deck Roof

What VLT should the deck be, and what material should I make it from?

Materials:

• Polycarb: cheap, easy to cut and fix. Brittle after a decade or so; can look dirty.
• Fibreglass: Amperlite says it is best (more durable) more hot climates; needs a 'gel coat' to stop delam
• Multicell polycarb: expensive; better performance (see graph - not that radical)

Is multicell better in regards to:

• Appearance: yes, but details are important at the end.
• VLT v SHGC: A bit, but not really - see graph below.
• U-Value: Yes, but this is not really relevant unless one side is conditioned (not the case for the deck)

What VLT?

• Fix the window VLT at 60% and modify deck vlt to get good daylight into the kitchen. Use the lowest possible for good daylight to reduce heat gain.

No muppets: blackbox first (okay, not shown)

Above : Deck roof VLT 0%: Acceptable, but back of roof will be darkish (2% DF).

Above: VLT of 30%: for deck. This provides 4.0% DF even to the back of the room. This is the lower limit.

VLT of 60%

Above: 60% VLT. This is pretty damn bright, and would be the upper limit.

Deck Roof Design Results

• Use polycarb or fibreglass, not multicell.
• Use VLT of 30 to 60%
•