Summer Sourdough Crushed Ice & Water Temp Chart for a Hot 78 Degree (78°F / 26°C) Kitchen — High-Friction Planetary Mixer (74°F DDT)
4-factor Desired Dough Temperature (DDT) and 80 cal/g latent heat crushed-ice calculation for hitting 74°F dough in a hot 78°F room.
Target a 74°F (23.3°C) dough, account for a 78 degrees (25.6°C) room plus 78 degrees flour and levain, then add the +24°F of heat that high-friction planetary mixer (74°f ddt) generates: 4 × 74°F − (78 + 78 + 78 + 24) = 38°F of mix water. Blending 68g of crushed ice with 282g of 74°F water is how you reach 38°F in this kitchen; the phase change alone strips 80 cal per gram before the water even warms.
- Required Water Temp
- 38°F (3.3°C)To hit 74°F DDT in 78°F room
- 350g Batch Ice Split
- 68g Ice / 282g WBased on 74°F tap water & 80 cal/g latent heat
- Mixer Friction Factor
- +24°FHigh-Friction Planetary Mixer
- Target Final Dough Temp
- 74°F (23.3°C)Locks fermentation clock & protease rate
Batch-Scaled Ice & Water Chart for a 78°F Kitchen (High-Friction Planetary Mixer (74°F DDT))
Each row re-solves the 4-factor equation at a different batch size; the 38°F target stays constant while the ice mass scales.
| Batch Water Weight | Required Mix Temperature | Crushed Ice Weight | Liquid Water Needed | Final Dough Temperature |
|---|---|---|---|---|
| 350g water (78°F / +24°F) [Anchor] | 38°F (3.3°C) | 68g crushed ice | 282g tap water (@ 74°F) | 74°F (23.3°C) final dough |
| 300g water (78°F / +24°F) Quarter Batch | 38°F (3.3°C) | 58g crushed ice | 242g tap water (@ 74°F) | 74°F (23.3°C) final dough |
| 400g water (78°F / +24°F) Three-Quarter Batch | 38°F (3.3°C) | 77g crushed ice | 323g tap water (@ 74°F) | 74°F (23.3°C) final dough |
| 250g water (78°F / +24°F) Half Batch | 38°F (3.3°C) | 48g crushed ice | 202g tap water (@ 74°F) | 74°F (23.3°C) final dough |
| 500g water (78°F / +24°F) Double Batch | 38°F (3.3°C) | 97g crushed ice | 403g tap water (@ 74°F) | 74°F (23.3°C) final dough |
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Baking Sourdough in a Hot 78°F Room: Why You Need 38°F Water (68g Ice)
Latent heat of fusion is why the cooling arithmetic is not linear. Replacing 68g of the 350g of water with crushed ice removes not merely 68g × 1 cal/g of sensible heat, but 68g × 80 cal/g of phase-change heat, which is what allows a 78 degrees (25.6°C) room to be cooled into a 74°F dough.
Friction factors are equipment-specific. The +24°F used for high-friction planetary mixer (74°f ddt) is a lumped parameter covering the steel bowl, ambient convection, hydration exotherm and shear work, and it changes if you switch from a spiral hook to a paddle.
Thermal Control Protocol for High-Friction Planetary Mixer (74°F DDT) in a 78°F Room
- Check for Sunlight: A 25.6°C (25.6°C) reading taken in direct sun is unreliable — move the bowl to the work surface and re-probe before you trust the arithmetic.
- Equalise the Levain: Pull the starter out of the refrigerator and let it come toward 25.6°C, because the levain is a third of the 4-factor equation and a cold levain silently drags the whole dough down.
- Build the Slush: Combine 68g of finely crushed ice with 282g of tap water at 74°F and stir until no shards remain.
- Mix, Probe and Trust: Run high-friction planetary mixer (74°f ddt) (+24°F), then confirm the dough reads 74°F ± 1°F before the fermentation clock starts.
Frequently Asked Questions for This Desired Dough Temp (DDT) & Ice Solver Spec
What is the DDT formula for a 78°F kitchen using High-Friction Planetary Mixer?
Target water temperature = (4 × 74°F) − (78°F room + 78°F flour + 78°F levain + 24°F friction) = 38°F (3.3°C).
Will the dough temperature change if I scale the recipe?
No. The 4-factor equation is a temperature balance, not a mass balance, so doubling the flour and water keeps the same 38°F target — but you must double the ice too, from 68g to 136g.
Should I probe the flour and levain separately?
Yes. The equation counts the flour and levain as 78°F each, and in a 25.6°C (78°F) kitchen a levain straight from the refrigerator can be 10°F cooler, which alone will miss the 74°F target.