The lack of freshwater resources has become the biggest obstacle to the sustainable development of the world economy with the expansion of population and the impact of climate change. Seawater desalination is recognized as the most effective means to alleviate water scarcity. A double-effect seawater desalination system using compression heat pump is proposed by combining a compression heat pump and a double-effect desalination system. Performances of the proposed system are simulated using Aspen simulation software. Based on the simulation results, the influence of heat pump evaporating/condensing temperature, temperature difference between the two effects and the brine circulation ratio on the system Performance Ratio (PR) and freshwater production are analysed. It is concluded that the value of PR increases but the freshwater production reduces with the increase of evaporating temperature of the heat pump. Both the value of PR and the freshwater production decreases with the condensing temperature of the heat pump. An optimal temperature difference between the two effects exits to get the highest PR and freshwater production for a constant heat pump operation condition. The freshwater production can increase slightly with the increase of the brine circulation ratio. When the mass flow rate of feed seawater is 80kg/h and the evaporation temperature of primary effect evaporator is 40°C, the PR of the system reaches 40.07 with an evaporating/condensing temperature of 20°C/50°C. The freshwater production is 39.76kg/h with an evaporating/condensing temperature of 10°C/50°C.
For the novel frost-free air source heat pump system (FASHP), the compressor waste heat is used to assist desorption for the desiccant on the surface of the desiccant coated heat exchange (DCHE). It can promote the desorption efficiency of the DCHE in the FASHP and reduce the energy loss, which means the improvement of the stability and performance. In this paper, a DCHE model is established, and its accuracy is verified through experimental data. The model is then used to analyze the effect of working conditions and structural parameters on the adsorption rate, desorption rate, heat exchange and proportion of latent heat in the adsorption and desorption processes. The results show that the latent heat ratio is higher, the heat exchange of the DCHE is lower and the system performance is better when the temperature of the analytical circulating air increases and the velocity decreases to 25 °C/0.5 m/s. In addition, the performance is greatly affected by the fin length and width. With the increase of parameters, the heat exchange and proportion of latent heat can be increased to 115.9 J and 69.0%.
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