Ajay Palta

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HOPE Cycle - Coolant Becomes the Working Fluid

HOPE Cycle - Coolant Becomes the Working Fluid HOPE Cycle - Coolant Becomes the Working Fluid HOPE Cycle - Coolant Becomes the Working Fluid

HOPE Cycle - Coolant Becomes the Working Fluid

HOPE Cycle - Coolant Becomes the Working Fluid HOPE Cycle - Coolant Becomes the Working Fluid HOPE Cycle - Coolant Becomes the Working Fluid

A new engine cycle that doubles efficiency, caps temperatur

🎥 Watch the Film🧮 Try the Calculator📄 Download Whitepaper

The Problem

Engines Waste Half Their Fuel as Heat

 

  • Efficiency stuck at ~30–40%.
  • Cooling systems dump 35% of energy.
  • Exhaust gases waste another 30%.
  • Higher compression ratios are blocked by knock & heat.

The Solution to The Problem

HOPE Turns Coolant Into Power

 

  • Water absorbs compression heat → prevents knock.
  • Nearly isothermal compression → less work.
  • Steam joins expansion → more work, lower temps.
  • Exhaust cool enough to condense & recycle >90% of water.

Result Callout: Efficiency jumps to 60–70% in practice, with a theoretical ceiling near 85%.


Ajay Palta

How It Works (Step-by-Step)

Step 1 – Compression:

 Water droplets flash into steam, flattening P–T curve. 

Step 2 – Cap

 

  • Peak pressure/temperature controlled at TDC.

Step 3 – Expansion

  Steam-rich expansion holds pressure longer, adds work. 

Step 4 – Exhaust & Condense:

  Exhaust ~400 K, condenser recycles water. 

Calculate - Check the Math Yourself

Choose Cylinder Size, CR, Water Injection & Cap Mode

Why It Matters

For Engineers

For Policymakers

For Engineers

 

Knock-free SI, soot-free CI, higher CR, lower Tmax.

For OEMs

For Policymakers

For Engineers

 

Drop-in upgrade to existing blocks with a condenser loop.

For Policymakers

For Policymakers

For Policymakers

 

Twice efficiency → half the oil bill, half the CO₂.

Validation & Numbers

 

  • Case Study Box:
    • CR = 40, Water = 0.4 g/1000 cc, Pressure Cap = 250 bar
    • Efficiency ≈ 61%
    • Net Work ≈ 0.85 kJ/cycle
    • IMEP ≈ 8.7 bar
  • Comparison Callout: Same geometry as Otto/Diesel → nearly double the work output


The Future of Engines Isn’t Over. It’s Reborn.

HOPE frees the engine from its thermal bonds. Not HCCI, not fuel cells, not EV — but a new cycle tha

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