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Mathematics 2021, 9, 33 9 of 31 Reference [45] Description The authors have mentioned that the seawater in copper tubes is usually used in condenser but owing to the drawbacks of pipe erosion; the usage of the air-cooling condenser in place of a water-cooled condenser can be a suitable option. However, the prime challenge is to attain sufficient enough heat flux in air-cooled condensers owing to the poor thermal conductivity of air. Therefore, in the work, the performance of a humidification-dehumidification desalination plant is presented with integration with an air-cooling condenser and cellulose evaporative pad. The authors have presented a configuration in which the heat required to drive the HDH solar desalination plant is recovered from a source (there can be many of them depending on its type). The seawater is appointed to recover the waste heat of any process and based on the mass and energy conservation principles; a mathematical model is derived to simulation the process. Similar work is also presented by the authors in reference [47]. Table 1. Cont. Maximum productivity of 120 kg per day was achieved using the humidifier of cellulose pad operating on a water temperature of 49.5 ◦C. The maximum gained-output-ratio was 0.53 with a maximum coefficient-of-performance of 20.7. Findings Location of the Analysis Taiwan Demonstration Dates of the Analysis The configuration is not integrated with a solar-driven energy resource; therefore, the time dependency does not have significance. Gaps with the Current Work The configuration is not integrated with a solar-driven source; instead, it utilized an electric heater in the water storage tank. Additionally, the dehumidifier design is different than the one proposed in this work, as the dehumidifier of reference [45] is an air-cooled condenser, and the one presented in the work is the conventional water-cooled condenser. There are many fundamental differences between this and the current work. The HDH system of reference [46] is driven from a waste heat whereas the system in the current work is driven from a solar energy source. Moreover, the concept of waste heat recovery is quite different in both works; where the current work is dedicated to the internal waste heat recovery; whereas, the work of reference [46] focuses on the desalination system delivered from a waste heat recovery unit. [46] The results of the simulation have shown that the maximum value of the freshwater at 99.05 kg per hour and of gained-output-ratio at 1.51 is obtained when the balanced condition of the dehumidifier appears at the design conditions. It was also concluded that reducing the seawater spraying temperature and evaluating its humidification effectiveness is beneficial for its thermoeconomic performance. ChinaPDF Image | Humidification Dehumidification Solar Desalination System
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