## 1 Introduction  
Solar energy is regarded as a favorable and clean renewable energy resource. A PV-Thermal solar collector, as the heat source of an Organic Rankine cycle (ORC) can be used for power generation. Different types of different nanofluids can be considered for use in the solar PV-Thermal to improve its efficiency. In the following sections, we will discuss the literature reported work [1; 2; 3; 4; 5; 6; 7; 8; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18; 19; 20; 21; 22; 23; 24; 25; 26; 27; 28] on Organic Rankine Cycle, ORC, solar PV-Thermal, and different nanofluids as a heat transfer fluid to drive waste heat boiler of ORC. As solar irradiance is converted into electrical energy in the PV cell, excess thermal energy is generated due to the inherent conversion efficiency process limitation of the PV cell. The higher the excess thermal, the higher the temperature of the PV cell. This, in turn, reduces the conversion efficiency of the cell. By using a flow of cold-water flow though the thermal tubing underneath the PV cell, this excess thermal energy can be recovered for a useful purpose. This process reduces the PV cell temperature and enhances the energy conversion efficiency of the PV solar panels [1; 2; 3; 4; 5; 6; 7; 8; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18; 19; 20; 21; 22; 23; 24; 25; 26; 27]. Nowadays, the organic rankine cycle (ORC) has become an important technology for recovering waste heat, heat from renewable heat source for improving thermal performances. This technology is manly used for low temperature and low-grade energy resource [6; 7; 18]. ORC can be integrated with different working thermal power plants such as a combined gas-steam power plant, a solar-integrated combined cycle, a solid oxide fuel cell, geothermal, biomass or combination of these hybrid power plants to be used as a heat source to ORC. A paper has been presented in [9] on a theoretical investigation of a new configuration of the combined power and cooling cycle known as the Goswami cycle ammonia as the refrigerant. A comprehensive analysis was conducted to determine the effect of key operation parameters such as ammonia mass fraction at the absorber outlet and boiler-rectifier on the power output, cooling capacity, effective first efficiency, and effective exergy efficiency. Moreover, [PERSON] et al. [9] showed that the new dual-pressure configuration generated more power than the single pressure cycle, However, the results also showed that it reduced the cooling output as there was less mass flow rate in the refrigeration unit. A review of three cycles, namely the Organic Rankine cycle, the Kalina cycle and the Goswami cycle and various work on them was presented by [PERSON] et al. [10], work done by different authors on optimization of the cycles and introduction of new efficient cycles. Selection of fluids, three cycles namely the Kalina cycle, the Goswami cycle and ORC, have been optimized by different authors using different types of fluids and their reviews are concluded here. Low-grade heat topic deals with the electricity generation from low-grade heat sources such as solar thermal, geothermal and industrial waste heat using different cycles mainly ORC, the Goswami cycle and the Kalina cycle. In addition, the authors presented an analysis of different thermodynamic cycles for combined power plant using low-grade heat sources. Different thermodynamic cycle using low grade heat sources for combined power plant were also reviewed. A theoretical investigation of a combined Power and Cooling Cycle that uses an Ammonia-Water mixture has been reported by [PERSON] et al. [11]. The cycle combines a Rankine and an absorption refrigeration cycle. A comprehensive analysis of the effect of several operation and configuration parameters, including the number of turbine stages and different superheating configurations, on the power output and the thermal and exergy efficiencies was conducted. Their results show that the Goswami cycle can operate at an effective exergy efficiency of 60%-80% with thermal efficiencies between 25% and 31%.