**4. Experimentation**

An experimental system was designed and installed to test workability of proposed concept. **Figure 5** shows the temperature profiles of MEDAD effects at heat source of 45°C. The pilot was tested at different temperatures to investigate the performance. **Figure 6** shows the hybrid MEDAD system effects temperatures at different heat source temperatures. The system performed well as per designed 3–4°C inter-effect temperature difference. Similarly, **Figure 7** shows the corresponding saturation pressures.

**Figure 8** shows the water production profiles of MED effects, AD condenser and total production at 45°C heat source temperature. The summary of water production presented in **Figure 9** at different heat source temperatures. It can be seen that at higher temperature the water production is also higher and it drop due to drop in heat capacity. The system is designed for 45°C operational temperature but it performed well at off-design conditions. It shows the robustness of the thermally driven desalination systems.

The thermal energy consumed is shown in **Figure 10**. It can be noticed that at higher heat input temperature the energy consumed by the system is also higher. It is mainly due to the higher temperature difference between heat inlet and out

**Figure 5.**  *Hybrid MEDAD temperature profiles at 45°C heat source.* 

**Figure 6.**  *Hybrid MEDAD inter-effect temperatures at different heat source (reproduce with author's permission [30].* 

*Desalination with Renewable Energy: A 24 Hours Operation Solution DOI: http://dx.doi.org/10.5772/intechopen.84944* 

**Figure 7.**  *Hybrid MEDAD inter-effect pressures at different heat source (reproduce with author's permission [30]).* 

**Figure 8.**  *Hybrid MEDAD water production profiles at 45°C heat source (reproduce with author's permission [30]).* 

**Figure 9.**  *Hybrid MEDAD water production at different heat source temperature (reproduce with author's permission [30]).* 

**Figure 10.**  *Hybrid MEDAD thermal energy input at different heat source temperature (reproduce with author's permission [30]).* 

temperatures. The interesting trend was noticed at below 25°C where heat input showed negative value. It is because the heat was scavenged from the ambient. The system was operating below ambient conditions due to adsorption cycle hybridization that allows last effects to operate as low as 5°C.

 The successful experimentation of hybrid MEDAD cycle proved the workability of TES + MEDAD system for future sustainable water supplies.
