Process chilling Use of Adsorption Cooling Is on the Rise

Editor: Gabriele Ilg

Many companies are looking for ways to utilize waste heat and to decrease the estimated 14 % of final energy demand that is accounted for by cooling technology. Adsorption cooling represents a sustainable and low-maintenance approach to cooling. The use of adsorption cooling continues to rise, and Achema attendees can view adsorption process coolers from Invensor.

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Adsorption coolers, like those from Invensor, utilize waste heat, rather than electricity, as power.
Adsorption coolers, like those from Invensor, utilize waste heat, rather than electricity, as power.
(Picture: Invensor)

The company offers adsorption coolers in the range from 5 to 200 kW. Invensor chillers produce chilled water using heat as a driving energy, rather than electricity. Typical heat sources that can provide energy include combined heat and power (CHP) units, solar thermal installations and waste heat from industrial processes. Invensor chillers use zeolites as adsorbers and use water as the refrigerant. Power savings achieved are generally between 70 % and 90 %, according to company literature.

The chillers are available as integrated hydraulic units that are ready to use. Invensor chillers can be easily connected in parallel in the case of larger projects, the company says. The adsorption cooling expert recently launched its "LTC 30 e plus" unit, which has a cooling capacity of 35 kW and an Energy Efficiency Ratio (EER) of 33, according to the manufacturer. Feedback from the launch was positive, the company says.

The LTC 30 features a microcontroller to allow a wide variety of configurations and adjustments that tailor the system to the needs of the application. Target water temperatures in the chilled water circuit can thus be easily adjusted on the multilingual touchscreen display. The unit can also be used as a heat pump.

Potential applications for adsorption coolers include industrial applications, such as cooling temperature-sensitive goods, integrating cooling cycles into CHP systems and others. In industrial settings, many adsorption cooler installations pay off the initial investment within two to five years, Invensor states.

In addition to being highly efficient, adsorption coolers are extremely reliable and are simple to operate. The company says it works closely with planners and decision-makers in the development and implementation of projects in order to ensure the optimal end results from the beginning.