Ionic Liquids for Utilization of Waste Heat from Distributed Power Generation Systems Page: 3 of 8
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Task 6 Milestones
- Using all the thermodynamic information collected, simulated, modeled and tabulated,
we calculated the ideal coefficient of performance (COP) of an absorption refrigeration
cycle for three different ionic liquid/H20 pairs over a variety of operating temperatures
and compared to the ideal COP of a traditional LiBr/H20 absorption refrigeration cycle.
As can be seen in Figure 1 and 2, there are two important observations that can be made.
(a) Firstly, all three ionic liquid/H20 pairs produce a more efficient absorption
refrigeration cycle than LiBr/H20.
(b) Secondly, it is also of note that the COPs for the IL/H20 pairs do not decrease as
quickly with increasing generator temperature compared to that of LiBr/H2O. This flatter
curve allows for much higher COP than the LiBr system as the generator temperature is
increased. This allows for a much more efficient cycle for higher waste heat
0.9 -.- LiBr
0.84 - -
90 95 100 105 110 115 120 125
Generator Temperature [C]
Figure 1 Coefficient of Performance of a heat-operated absorption refrigeration cycle for
various generator temperatures, with evaporation, condensation, and absorption occurring
at Te = 5 C, T, = 50 C, and Ta = 40 C, respectively. The three different ionic liquids
are compared with LiBr/water and all function as the absorbent while H2O is used as the
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Brennecke, Joan F.; Sen, Mihir; Maginn, Edward J.; Paolucci, Samuel; Stadtherr, Mark A.; Disser, Peter T. et al. Ionic Liquids for Utilization of Waste Heat from Distributed Power Generation Systems, report, January 11, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc897738/m1/3/: accessed January 16, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.