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Humidification-dehumidification desalination system operated by a heat pump

机译：由热泵运行的加湿除湿淡化系统

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Humidification-dehumidification is a carrier gas based thermal technique that is ideal for small-scale water desalination applications. One advantage of humidification-dehumidification systems is the ability to utilize low grade and renewable energies as heat source to drive the system. This work presents theoretical investigation of humidification-dehumidification desalination system operated by a heat pump. The model is based on the first law of thermodynamics, describing heat and mass transfer in the combined humidification-dehumidification heat pump cycle. The model predicts the performance of closed-air open-water water-heated, and modified air heated cycle coupled with a heat pump. To improve the Gain output ratio and energy recovery of the system, a heat pump is used as the source of heating and cooling for the humidification-dehumidification desalination system. Energy rejected in the condenser is used as a source of heat in the humidifier whereas the cooling effect of the evaporator is used to cool incoming seawater for effective condensation of humid air in the dehumidifier. A parametric study is conducted to investigate the influence of system operating parameters, including water and air flowrate, seawater temperature, and refrigerant flow rate on the system performance. Results indicate a maximum Gain output ratio of 8.88 and 7.63 obtained at 80% components effectiveness and mass flow rate ratio of 0.63 and 1.3 for modified air heated and water heated cycle, respectively. A maximum gain output ratio greater than 10 can be achieved for humidifier and dehumidifier effectiveness of 100% leading to more energy efficient systems. The cost of desalinated water production is calculated and the effect of major parameters on its variation is also presented.
机译：加湿-除湿是一种基于载气的热技术，非常适合于小型水淡化应用。加湿-除湿系统的优点之一是能够利用低品位和可再生能源作为热源来驱动系统。这项工作提出了由热泵运行的加湿-除湿脱盐系统的理论研究。该模型基于热力学第一定律，描述了加湿-除湿热泵组合循环中的传热和传质。该模型可预测封闭式露天水加热，改进的空气加热循环与热泵的性能。为了提高系统的增益输出比和能量回收，热泵被用作加湿-除湿脱盐系统的加热和冷却源。冷凝器中排出的能量被用作加湿器中的热源，而蒸发器的冷却效果被用来冷却进入的海水，以使湿空气有效地凝结在除湿器中。进行了参数研究，以研究系统运行参数（包括水和空气流速，海水温度和制冷剂流速）对系统性能的影响。结果表明，在改进的空气加热和水加热循环下，分别以80％的组件效率和0.63和1.3的质量流量比获得的最大增益输出比为8.88和7.63。增湿器和除湿器的效率达到100％时，可以实现大于10的最大增益输出比，从而带来更加节能的系统。计算了淡化水的生产成本，并提出了主要参数对其变化的影响。

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