HyCool: Industrial Cooling through Hybrid system based on solar heat, is a project co-funded by the European Union, related to the “LCE-12-2017 (IA): Near-to-market solutions for the use of solar heat in industrial processes” call, starting on May 2018 with a duration of 36 Months and a budget of 7.74 M€.


Our main mission is increasing the current use of Solar Heat in Industry Processes, and to do so the project proposes the coupling of a new Fresnel CSP Solar thermal collectors (FCSP) system with specially build Hybrid Heat Pumps (HHP) – a “two-in one” combination of adsorption and compressor based heat pumps – for a wider output temperature range (Solar Heating & Cooling –SHC-), and a wide range of design and operational configurations to increase the potential implementation of the proposed Solar Heat in industrial environments.


  • Hybrid sorption/compression system:
    A hybrid sorption/compression chiller exploits both thermal energy, either from waste heat or renewable sources, and electrical energy, to deliver cooling energy at high electrical efficiency. The system comprises a sorption module, whose evaporator cools down the condenser of a vapor compression chiller, thus enhancing the achievable electrical COP. 

    cascading hybrid heat pump

    Schematics of the cascading hybrid heat pump and 3D rendering of the aggregate of cascaded hybrid heat pump with a nominal cooling capacity of 10 kW.


  • Solar steam generation:
    The Concentrating solar collectors consists of long narrow mirror strips, which are pivot-mounted on a base plate over their full length. The control logic operates the actuator in such a way that it aligns and orients all the mirror strips continuously according to the position of the sun. The angles of the individual mirror strips are chosen in such a way that the sun light is focused onto the receiver during the whole day. 

    Concentrating solar collectors

    Concentrating solar collectors



The system integration and hydraulic concept defines the possibilities of the energy flow. Based on that, an overriding energy management can be engineered to optimize the system utilization and performance.


To avoid downtimes or unused excess energy it is advisable to integrate all relevant heat loads to the solar heat source. Depending on how the accumulation of heat load profiles overlays with the availability of solar energy additional storage capacities are required. For hot water or superheated water a conventional buffer tank or PCM-storage tank can be used.


Small buffer tanks can cover slight fluctuations in the load profile or solar irradiation and makes the control of the system more reliable. Medium sized buffer tanks can cover significant peak demands or temporary lacks of solar gain on a cloudy day. Bigger buffer tanks can take over the complete energy supply for a couple of hours or during night time or collect the solar energy from the weekend to utilize it during working days. An economic sizing of storage capacities depends on the load profiles and has to be calculated individually for each project.


For a reasonable demonstration of an optimized energy distribution by balancing the energy flow between generation and consumption, the solar peak power should be minimum twice of the chiller heat consumption.


System Integration - Concept

System Integration – Concept


With this concept we aim to reach the following advantages:

  • Higher solar fraction with optimizes utilization factor at the same time.
  • Higher reduction of carbon emissions per square meter solar system.
  • Compensation of peak demands.
  • Balancing the load consumption for optimized system efficiency.
  • Energy management connected to ICT architecture for smart grid integration.
  • Flexibility based on the energy source for the chiller in connection with a smart grid system.
  • Economic selection of the energy source.
  • Monitoring of all energy flows.
  • Visibility of new saving potentials and of the integration of other renewable energy sources.


In this way, we will use the latest available developments in both Concentrated Solar Panels and Thermal Storage fields to develop two innovative Hybrid Solar System concepts: one for Chemical Industrial Processes primarily meant for Solar Steam and Cooling energy provision and one for the Small Food Industry primarily meant for Solar Cooling production – for more info visit the Pilot Sites section.