Not only an increasing of absorber pressure, but an increasing of generator temperature can also improve the performance of single-effect absorption refrigeration machine. One notable approach, proposed by Aphornratana and Eames, is shown in Fig. 15. An ejector is placed between a generator and a condenser. If a high-temperature heat source is available, the generator temperature may be raised and the solution concentration can be maintained constant. Therefore, the occurrence of crystallization in the generator is prevented. The ejector uses high pressure vapour refrigerant from the generator as the motive fluid. At the evaporator, the vapour refrigerant is not only absorbed into solution in the absorber entrained but also entrained by the ejector. Thus, the COP is higher than that for a conventional system. Experimental investigation showed that COP of 0.86–1.04 could be achieved. The major drawback of this system is, the generator must be operated at very high temperature (190–210 C), and therefore, a corrosion of material may be problematic. The mathematical description of this system was given later by Sun et al. In the same manner as Sun et al., the simulation of Alexis and Rogdakis was done on a similar system using CH4O/H2O as the refrigerant. In their study, solar energy was assumed to be the energy source of the refrigerator. The approach proposed by the series of studies of Eames and Wu is shown in Fig. 16. This cycle is a combined cycle between a steam jet heat pump and a single-effect absorption refrigerator. The steam jet heat pump is used to recover heat rejected during the condensation of the refrigerant. This recovered heat is supplied back to the generator of an absorption system. In this case, the maximum temperature of the solution is 80 C. Therefore, the corrosion problem is eliminated. The experimental COP of 1.03 was claimed. Other studies related to hybrid ejector-absorption cycle were also presented in.