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Solar cooling systems

Jakob U.

Polska Energetyka Słoneczna

2007

nr 1-2

18-23

This paper presents the different technologies of solar cooling systems and there advantages as well as functional characterisations. The air-conditioning as well as the solar thermal market in Europe and world-wide shows annual growth rates of several percents. In the first case initiated by the growing demand for air-conditioning in residential houses as well as office and hotel buildings and in the second case by increasing environmental awareness or political guidelines. Due to the large number of manufactured compressor units, these systems are produced and offered at very low prices, however, such systems increase the adverse effects on local environments as a result of using primary energy such as electricity. Therefore, it is important to search for alternative air-conditioning units that are driven by either waste heat or solar thermal energy.

Development of a small-scale solar thermal driven diffusion absorption chiller

Jakob U., Eicker U.

Zeszyty Naukowe. Inżynieria Środowiska / Politechnika Opolska

2006

Vol. 319, z. 5

245-253

This paper describes the development and investigation of three single-effect hot-water driven, solar thermal powered diffusion absorption cooling machines (DACM) each with a design cooling capacity of 2.5 kW. The first DACM prototype showed that the values of COP ranged from 0.10 to 0.20, and the evaporator cooling capacity could reach 1.5 kW. However, the auxiliary gas circulation of the first prototype was not high enough, leading to fast saturation of evaporated ammonia. The second compacted prototype showed stable and continuous temperature and pressure levels. The reached COPs were between 0.2 and 0.45 and the continuous cooling performance was between 1.0 kW and 1.6 kW. A third prototype with marketable dimensions was set up in October 2005. The results showed cooling capacities between 0.7 kW and 3.0 kW. The reached COPs are between 0.12 and 0.38.

W pracy przedstawiono model oraz badania 3 kolejnych prototypów chłodziarki absorpcyjnej wykorzystującej energię słoneczną. Urządzenie posiada moc chłodzenia równą 2,5 kW. Opracowano model w warunkach pracy ustalonej chłodziarki, który wykazuje dobrą zgodność z wynikami badań.