Abstract
HDH seawater desalination technology has characteristics of flexible scale, small investment, and suitable for decentralized fresh water demand. This paper designs a HDH seawater desalination system, and based on the principles of energy conservation and mass conservation, a theoretical calculation model is established, and the influence of spray liquid flow and temperature, airflow, cooling water temperature and flow on the system water production and Gained output ration (GOR) is studied. And the orthogonal analysis method is used to study the influence of different parameters on water production and GOR. The results show that: water production and GOR are positively related to temperature of the spray liquid, when spray liquid or air flow is large, fresh water output is negatively correlated with air flow, system water production and cooling water flow are positively correlated at first, then system fresh water production tends to be stable, GOR and cooling water flow are first negatively correlated, and then GOR become stable, water production is negatively correlated with cooling water temperature, GOR is positively correlated with cooling water temperature. The spray liquid flow rate has the greatest influence on water production, and spray liquid temperature has the greatest influence on GOR.
Highlights
The survival and development of human society are inseparable from water
The results showed that it was different from the conventional device, the water production and energy recovery coefficient can be increased by 1.5 times. .Rajaseenivasan [14] analyzed the bubbling tower HDH seawater desalination system with different combinations of solar collectors
The results showed that when other parameters are constant, as the amount of feed seawater increases, fresh water production and heat input increase, but Gained output ration (GOR) decreases
Summary
The survival and development of human society are inseparable from water. The earth is rich in water resources, with a total water storage of approximately 1.4 billion cubic kilometers. Most of the seawater desalination devices with mature technology and commercial production are traditional large-scale devices, are suitable for energy-rich economically developed regions [2], which cannot effectively solve the shortage of fresh water in remote and scattered areas. The seawater sprayed from the humidifier transfers heat and mass with the countercurrent air conduct In this system, the energy utilization rate is not very ideal, because the HDH processes are not separated, and the difference between the evaporation temperature and the condensation temperature is small. For the study of multi-effect mathematical models for humidifiers, dehumidifiers and heat exchangers showed that: the water production rate of the system is higher than the one-effect system and the three-effect system [21]. This paper proposes a HDH system based on the plate tower humidifier, and conducts theoretical analysis and calculations to provide guidance for subsequent experimental research and practical engineering applications
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