This document contains the first system image of a cascade chiller as part of the research project - "HYCOOL". The system presented forms one of the core elements of this project. A novel, two-stage cascade connection is the focus of the investigations. Driven by hot water, an adsorption unit represents the warm stage of the cascade. The adsorption process provides cold water at a low thermal level. The colder stage of the modular hybrid heat pump is based on a compression refrigeration unit. Both working principles are combined. The cold water from the adsorption plant will be used to dissipate heat in the condenser of the lower stage. In this way, the temperature lift between the evaporator and the condenser of the compression circuit is reduced and consequently, energy efficiency is increased while compressor power consumption is reduced.