Summer Sourdough Crushed Ice & Water Temp Chart for a Hot 80 Degree (80°F / 27°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 80°F room.
If you mix with 76°F tap water in a 80°F (26.7°C) kitchen using high-friction planetary mixer (74°f ddt), the dough will land well above 74°F and ferment far too fast. The arithmetic 4 × 74°F − (80 + 80 + 80 + 24) gives the required 32°F (0°C) mix temperature instead. Your 76°F tap water is 44°F too warm for a 74°F dough, so 82g of crushed ice replaces that much of the 350g and 268g of tap water completes the mix.
- Required Water Temp
- 32°F (0°C)To hit 74°F DDT in 80°F room
- 350g Batch Ice Split
- 82g Ice / 268g WBased on 76°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
4-Factor DDT Table: 80°F Room, 74°F Target, High-Friction Planetary Mixer (74°F DDT)
Sums each row to the batch water weight so the split between ice and liquid always reconciles.
| Water Load | Theoretical Temp | Crushed Ice | Tap Water | Final Dough Temp |
|---|---|---|---|---|
| [Exact Target]: 250g total water | mix at 32°F | substitute 59g ice | keep 191g warm water | friction +24°F absorbed |
| Alt Line A: 400g total water | mix at 32°F | substitute 94g ice | keep 306g warm water | friction +24°F absorbed |
| Alt Line B: 350g total water | mix at 32°F | substitute 82g ice | keep 268g warm water | friction +24°F absorbed |
| Alt Line C: 300g total water | mix at 32°F | substitute 70g ice | keep 230g warm water | friction +24°F absorbed |
| Alt Line D: 500g total water | mix at 32°F | substitute 117g ice | keep 383g warm water | friction +24°F absorbed |
Live Parameter Solver for Summer Sourdough Crushed Ice & Water Temp
Dial in custom baker's percentages and export your adjusted 32°F (0°C) formula for bake day.
Baking Sourdough in a Hot 80°F Room: Why You Need 32°F Water (82g Ice)
Friction is the variable bakers forget. High-Friction Planetary Mixer (74°F DDT) contributes +24°F, and because that heat is generated inside the dough rather than supplied from the room, it cannot be compensated by simply lowering the water temperature of the flour. It has to be subtracted from the mix water before mixing begins.
Timing the correction is part of the correction. Weight the ice before the flour goes in, and mix ice and flour together first rather than adding ice to a wet dough, because the 80 cal/g latent heat only works if the ice is in contact with the water before the starch starts to hydrate.
Thermal Control Protocol for High-Friction Planetary Mixer (74°F DDT) in a 80°F Room
- Start the Night Before: In a 80 deg F (26.7°C) kitchen the flour will sit near room temperature overnight if you store it sealed, so re-probe it in the morning rather than trusting yesterday's reading.
- Prepare the Water Station: Get the 32°F (0°C) water ready before you open the flour bag — once the flour is wet the temperature negotiation is over.
- Blend Ice and Water: Stir 82g of crushed ice into 268g of 76°F tap water until the slush is uniform, then pour over the flour.
- Record and Repeat: Note the final probe reading alongside the 80 deg F (26.7°C) room temperature so the next bake is a copy rather than a calculation.
Cereal Chemistry & Bench Execution FAQs
Does humidity in a 80°F (26.7°C) kitchen change the water temperature?
Marginally. On a humid morning the dough surface loses less moisture and cools a little less, so half a degree less cold water is usually right. Treat it as a refinement, not a correction.
Why does my dough come out warmer than 74°F in a 80°F room?
Almost always the friction term. If you used 76°F tap water instead of 32°F, the 24°F that high-friction planetary mixer (74°f ddt) generates has nowhere to go, and the finished dough overshoots the target.
How much colder is the water than the room in this 80°F (26.7°C) kitchen?
48°F below the room temperature of 80°F. That gap is the entire thermal load that 24°F of high-friction planetary mixer (74°f ddt) friction and 80°F ingredients impose on the mix water.