Membrane contactors can be used in different components of absorption refrigeration systems such as absorber, desorber, solution heat exchanger etc. In this section the absorption refrigeration cycle configurations of the investigations examined in the present work is discussed. The operating principle and use of membrane contactors in the desorber of absorption refrigeration systems can alter the cycle configuration. However, the use of membrane contactors in the absorber has no significant effect on the loop configuration. Ali and Schwerdt (2009 and 2010), Ali (2010a or 2010b or both), Yu et al. (2012) and Isfahani et al. (2013) or Isfahani and Moghaddam (2013) [To verify] used plate-and-frame membrane module absorber with the same configuration as conventional single-effect water-LiBr absorption cycle as shown in Figure 1(a) . Schaal et al. (2008) and Chen et al. (2006) used the conventional single-effect ammonia-water absorption refrigeration cycle configuration using a hollow fiber membrane absorber module as shown in Figure 1(b). The unconventional cycle configurations used in the investigations examined in this work are discussed here.[Randel (1932) studied an NH3/H2O absorption refrigeration cycle employing the supplementary agent principle for pressure equalization in the evaporator (Qué es? Not Clear) . In this case the supplementary agent does not circulate with the refreshing agent (What is the refreshing agent? Write in your own words. Don't try to copy whole sentences) [Improve the writing style of this part]. The heat of absorption is used in the desorber to reduce the heat input [how?]. As shown in Figure 5, the main components of the cycle are the same… half of the paper… enters the pervaporation membrane unit where a membrane is employed for separation. Only the refrigerant is passed through the membrane and collected on the other side. The vacuum is created downstream of the membrane. The refrigerant is condensed and throttled to the evaporator to produce cooling, then it is absorbed into the absorber and the cycle repeats. The schematic diagram of this cycle is shown in Figure 8. The COP of the cycle using the membrane pervaporation process for vapor desorption is low compared to conventional adsorption systems because the pervaporation process requires a very high solution feed rate. high. The authors obtained a COP of 0.06 for their prototype operating on the pervaporation membrane principle, claiming that the low COP is due to the high circulation ratio since a high feed flow rate is needed to operate such membrane pilot module.