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Why is Higher Latent Heat Vaporization of ammonia make it more efficient compared to R22 which...

Why is Higher Latent Heat Vaporization of ammonia make it more efficient compared to R22 which has lower latent heat of vaporization?

Engineering   Mechanical-Engineering   
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Answer #1

Ammonia is the cheapest refrigerant. The price per kg for R22 is about 2.5 times and R134a is about 7.0 times the price of ammonia. For a large cold storage, the operation costs are 20-30% lower with ammonia than R22. Besides that, only half as much material needs to be purchased to charge a system because the density of ammonia is half of halocarbons.

Refrigerant Cost

  • Ammonia R717 - RM5/kg
  • R22 - RM10/kg

Density of at 1.013bar at boiling point: 682kg/m3 (ammonia liquid), 1413kg/m3 (liquid R22) .

Due to which the size of plans is reduced and amonia become more efficient than R22.

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