11 - 13 October 2016 // Nuremberg

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Really great efficiency: The HybridChiller impresses with record figures for cooling capacity and energy efficiency. From the laboratory to the field test.

With the HybridChiller, RIEDEL has developed a high-performance and energy-efficient refrigeration machine that combines compression and adsorption processes in a single device – a revolution in the field of refrigeration technology. The Fraunhofer Institute confirms the top performance values of the HybridChiller. And the first field tests also show that the energy saving potential for companies is enormous. Numerous funding programmes make the HybridChiller an even more attractive investment.

The HybridChiller is the result of cooperation between RIEDEL Cooling Technology and SorTech AG, the pioneer in the field of adsorption cooling technology. The HybridChiller combines compression and adsorption technology: A refrigeration machine works like an adsorption unit and uses the available waste heat as an energy source. The second module of the HybridChiller, a compression unit, provides efficient and precise cooling. Fluctuations in the waste heat and ambient temperature, as well as peak loads, are balanced out by the compressor in a targeted way. A closed water circuit is used as the coolant.

The laboratory test – truly revolutionary water cooling.
The Fraunhofer Institute for Solar Energy Systems ISE tested the new HybridChiller in the laboratory in July 2016. For Dipl.-Ing. Ivan Malenkovic, Fraunhofer ISE, the test was an interesting challenge: "I was really excited to see what the HybridChiller had to offer, as it's new combination of technologies is breaking completely new ground. We had to adjust to the new approach initially. We then set up a test environment that matches the specifications of the Eurovent directive as closely as possible. We measured the efficiency of the overall system in this environment. The result of these measurements gave us a comparable indication." Following extensive tests, the Fraunhofer experts have confirmed that the HybridChiller delivers a very good performance under real conditions. This is reflected in the ESEER value of 19.6: the ESEER value (European Seasonal Energy Efficiency Ratio) shows how efficiently a chiller works. For comparison: coefficients of performance (ESEER) of around 3.5 can be achieved with simple compression cooling.

The field test – efficient cooling in the metal-processing industry.
An available waste heat source with temperatures between 55 and 95 degrees Celsius is required to operate a HybridChiller. This type of heat source is available in district heating, processing heating in industry and cogeneration plants, for example. An application is currently in planning with a company from the metal processing industry active throughout Europe and outlines the concrete use and benefits of the HybridChiller:

Two cogeneration plants are operated in the production halls of the company for heating office rooms and production areas, as well as for producing domestic hot water. The power generated by the cogeneration plant is used in intrinsic consumption. The laser-based machine tools used during production require variable cooling to a constant temperature level to achieve a high product quality.
This is the perfect scenario for using a HybridChiller. The permanently available waste heat from the cogeneration plant at approx. 80 °C is used as the operating power for the adsorption component of the HybridChiller. Temporary additional or standard cooling capacity requirements are covered by the compression component. In the concrete example, the cooling water is supplied to the laser systems at 20° C. Using the waste heat means that electrical operating power for operating a purely compression-based cooling can be saved. The company benefits from calculated cost savings of around €4,800 per year. The electrical energy no longer required corresponds to a CO2 equivalent of 42,000 kg.

Further usage options – solar cooling in office or hotel systems.
In addition to metal and plastics-processing companies, solar cooling is another beneficial use of the HybridChiller. In this case, water is heated via solar thermal collectors and made available to the HybridChiller as a heat source. The HybridChiller uses this to produce cool water, which can be used for room cooling via concrete core activation, for example. A temperature difference of 3 K between the water temperature and the desired room temperature is sufficient here. As in all applications, the HybridChiller impresses once again with its constant reliable operation. If the temperature of the waste heat source falls, the HybridChiller switches to bivalent operation from compression and adsorption. If the heat remains insufficient due to the weather or during the night, the HybridChiller switches to pure compression operation automatically. In both cases, the cooling capacity remains stable at all times.

Attractive funding programmes – an investment that pays off.
In industry in particular, investments must pay off in just a few months. The funding programmes on national and regional level help to ensure a quick amortisation. The HybridChiller is eligible for funding as an overall investment via the government-owned development bank Kreditanstalt für Wiederaufbau (KfW). Operators of cogeneration plants in conjunction with a HybridChiller receive support in accordance with the Combined Heat and Power Act (KWK-G). The intelligent cooling technology means that the cogeneration plant can be operated all year round, which also means funding throughout the year. The use of the energy generated on-site is also repaid. The HybridChiller therefore offers a double benefit for companies: up to 80 percent reduction in power consumption for cooling and a quick return on investment.

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