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Solar Cooling with Water-Ammonia Absorption Chillers and Concentrating Solar Collector

Operational Experience
: Weber, C.; Berger, M.; Mehling, F.; Heinrich, A.; Núñez, T.

Volltext urn:nbn:de:0011-n-3073938 (5.7 MByte PDF)
MD5 Fingerprint: dfae80039c412ae433ae355d74d5ca68
Erstellt am: 1.10.2014

International journal of refrigeration 39 (2014), S.57-76
ISSN: 0140-7007
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ISE ()
Thermische Anlagen und Gebäudetechnik; Energieeffiziente Gebäude; Solarthermie; Energieeffiziente Gebäude und Gebäudetechnik; Elektrische und thermische Wärmepumpen; Kühlung und Klimatisierung von Gebäuden; Solare Kälteerzeugung; Wärme- und Kältespeicher; Energieeffiziente und solare Kühlung; Solare Prozesswärme; cooling; collector; absorption; heat; steam generation

Concentrating solar collectors provide high efficiency at high driving temperatures favourable for thermally driven chillers. Therefore, they offer applications for hot climates and industrial process integration, especially in combination with NH3-H2O chillers that provide refrigeration temperatures below 0 °C. The presented solar cooling installation comprises a linear-concentrating Fresnel collector that provides the driving heat for two NH3-H2O absorption chillers at temperatures up to 200 °C. Chilled water temperatures are produced in the range of -12 °C to 0 °C. Collector capacities reached up to 70 kW at peak times and the total cooling capacity of both chillers showed peak values up to 25 kW. For good operating conditions, the thermal system EER was 0.8 and an electrical system EER of 12 was easily achieved. The system showed a sound operating behaviour. The performance of different operation and control strategies was analysed, evaluated and enhanced within the two year operation phase.