Optimisation potential of solar thermal driven absorption refrigeration machine under using of a new work solution

摘要

With the conventional work solutions (H2 O/LiBr and NH3 /H2O) a minimum drive temperature of 80 °C needs at full load to drive the absorption refrigeration machine (ARM). In these cases the low temperature drive sources (solar thermal energy, district heating or waste heat) can not be used to drive the ARM without additional heat sources. Because of this, many investigations were carried out at the Technical University of Ilmenau (TUI) at new work solutions to lower the minimal drive temperature of the ARM and to reduce the requirements at the drive source with that. Many investigations at a new work solution (acetone/Zinc bromide) were carried out in the context of the research works at the TUI since 1999. The laboratory and field examinations at this work solution in an ARM have confirmed the possibility of application. The ARM with this work solution could operated already effectively with a drive heating source temperature of 55 °C. The practical examinations at an ARM with cold performance of 10 kW have shown that one can reach an evaporation temperature of 6 °C by use of the new work solution at a pressure of approx. 135 mbar. At refrigeration capacity of 1kW amounted the needed generating capacity 3 kW. The coefficient of performance (COP) amounted in this case 0,3.