Waste heat recovery based Adsorption system

Working principle

The principle of Adsorption works with the interaction of gases and solids. With adsorption chilling, the molecular interaction between the solid and the gas allow the gas to be adsorbed into the solid. The Adsorption chamber of the chiller is filled with solid material, silica gel, eliminating the need for moving parts and eliminating the noise associated with those moving parts. The silica gel creates an extremely low humidity condition that causes the water refrigerant to evaporate at a low temperature.
As the water evaporates in the evaporator, it cools the chilled water. The Adsorption chiller  has four chambers; an evaporator, a condenser and two Adsorption chambers. All four chambers are operated at nearly a full vacuum.

Waste Heat Recovery based Adsorption System

Comparison with VAM

Adsorption Chillers
Absorption Chillers
Life Expectancy
Greater than 25 Years
7 to 9 Years
Negligible Maintenance
Require High Maintenance
egeneration Temperature (Hot Water)
Down to 50°C (122°F)
Shuts down at 82°C (180°F), Needs Back-up Heater
Desiccant Use
Silica Gel (Inert)
Lithium Bromide (Highly Corrosive)
Replacement Requirements (Periodic Maintenance)
Not Required
Heat Exchangers, Boilers, Absorbent Replacement Required


Unbeatable Advantages

  • Long product life ( >25 yrs. ).
  • Low maintenance.
  • Regeneration temperature as low as 50°C.
  • ‘Green’ refrigerant ( water ).
  • Low electric consumption ( one-tenth the conventional system ).
  • No noise and vibration.

Additional Advantages

  • Start-up time 5 to 7 minutes compared to 15 minutes for Absorption.
  • Chilled water output 5°C – 10°C ( 40°- 55°F ).
  • No crystallization, corrosion, hazardous leaks, or chemical disposal issues.
  • No vibration or noise. Simple and continuous operations.
  • COP of 0.55 ( Coefficient of Performance ).
  • Versatile operation – Can be used for a wide range of industrial and commercial applications.