Abstract

The adsorption refrigeration is based on the evaporation and condensation of a refrigerant combined with adsorption or chemical reaction. The soaring fossil fuel price and the awareness of environmental problems offer many potential applications to thermal powered adsorption cooling. However, the adsorption cooling machines still have some disadvantages that hinder their wide application. This paper reviews more than 100 patents filed mainly since year 2000 that propose technologies to improve adsorption system and make it become a realistic alternative. The patents surveyed are classified into four main groups: adsorption system development, adsorbent bed innovation, adsorbent/adsorbate material development and novel application of adsorption cooling system. The various technology options are discussed and evaluated. “Hot spots” and key inventors/applicants are identified. An assessment is made about current and future development of adsorption refrigeration technologies.

Keywords: Adsorption refrigeration, Adsorption air-conditioner, Adsorption cooling, Adsorption chiller, adsorption heat pump