The local thermal sprinkler.

What actually releases a fire sprinkler?

Setting up the mechanism…

Thermal bulb temperature: 20.00°C
Spray flow: 0.00L/min
Local valve: Sealed

Release rating: 68.00°C

Fit bulb, sealing plug and deflector

What actually releases a fire sprinkler?

Hot air warms the bulb until its thermal element releases the plug. Water pressure then drives the spray against the deflector. Each head responds to its local heat.

Tbulb = Tair + (20 − Tair)e^(−t√u/RTI); Q = K√p

What this model simplifies

One 68 °C glass-bulb sprinkler, initial bulb 20 °C, illustrative RTI 50 (m·s)½, K=80 L/(min·√bar). Lumped thermal response excludes conduction correction and pipe pressure loss; not a fire-protection design.

Read the source · nfpa.org ↗

Put it to work.

Release the local sprinkler and discharge over 80 L/min.

Make it work.

Release this sprinkler with hot ceiling air.

Run

Fine adjustments 5

Ceiling air temperature°C

Hot air velocitym/s

Exposure durations

Water pressurebar

Smoke concentrationmg/m³

The local thermal sprinkler.

What actually releases a fire sprinkler?

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Figuvo

Understand by doing.

Understanding is something you do.

Figuvo is a place to look inside everyday things, build a connection, and discover the idea behind them.

177 interactive experiments. Each has a working model and a challenge to test what you found.

The original inspiration

Levers & fulcrums The surprising gyroscope The field cannon Inside the human body

Original demonstrations by The Bugged Dev. The teaching models and interactions here are new implementations.

Community builds

New teaching models inspired by public builds shared around Anatomy.

Anatomy · the original announcement How a rocket pushes through space · Gustavo Inside a tactile key switch · @retaqib Pressure through the coffee bed · Gustavo The overbalance wheel · Shawn A seconds pendulum clock · @Baconbrix Three feet on the ground · Soju Inside a layered particle detector · Yash A double-deck pressure cabin · Charlie Leave the spent booster behind · @quantapar Principal, interest and escrow · Sean Gear a Martian year · @samani_Two balls in, two balls out · @samani_Two slits, one probability pattern · @samani_Join through a clear plastic cover · Josh Brown Lay pipe without a sharp bend · @Phi10w Eight cylinders and a blower · @love4hxns Four columns under a Joglo roof · Nur Asyrof An office for dependent tasks · Yaroslav Yablonski One image, six editable layers · Meng To The Redis caching machine · @uviii_03 Inside the Sony CMD-J5 · Ann Afterburner thrust stand · Joshua Guo Open-back headphones · Surajan Shrestha Two-thread lockstitch machine · @slashui Signal factory · Dhruval Golakiya

Architecture

The local thermal sprinkler.

What actually releases a fire sprinkler?

Setting up the mechanism…

Thermal bulb temperature: 20.00°C
Spray flow: 0.00L/min
Local valve: Sealed

Release rating: 68.00°C

Fit bulb, sealing plug and deflector

What actually releases a fire sprinkler?

Hot air warms the bulb until its thermal element releases the plug. Water pressure then drives the spray against the deflector. Each head responds to its local heat.

Tbulb = Tair + (20 − Tair)e^(−t√u/RTI); Q = K√p

What this model simplifies

Read the source · nfpa.org ↗

Put it to work.

Release the local sprinkler and discharge over 80 L/min.

Make it work.

Release this sprinkler with hot ceiling air.

Run

Fine adjustments 5

Ceiling air temperature°C

Hot air velocitym/s

Exposure durations

Water pressurebar

Smoke concentrationmg/m³