Waste heat recovery of a transcritical CO₂ system with adsorbtion technology

A pioneering design makes it possible to use the waste heat of transcritical CO₂ refrigeration systems to drive an adsorption chiller in summer that generates additional cooling and thus supports the CO₂ refrigeration unit. The overall efficiency of the CO₂ transcritical system is raised by cooling the refrigerant additionally after the gas cooler on the one hand and on the other hand by lowering the high pressure. The two systems can very well be combined because of their demand and supply characteristics, as high ambient temperatures lead to high waste heat in the refrigeration system and this is when additional cooling from the adsorption chiller is especially effective. It is expected that this combination will lead to yearly energy savings of the refrigeration unit of around 8%.