Performance analysis of three-stage liquid desiccant deep dehumidification processor driven by heat pump

A new type of a heat pump driven three-stage lithium bromide liquid desiccant deep dehumidification processor is presented, which can dehumidify the outdoor humid air to a rather dry state, even when there is no available indoor exhaust air. The test results show that with an outdoor air temperature of 28 to 31°C and an outdoor air humidity ratio of 11 to 14 g/kg, the supply air temperature and the supply air humidity ratio are 1.6 to 2.6°C and 2.6 to 3.0 g/kg, respectively, and the coefficient of performance(COP)of the processor is 1.8.During the test, a liquid pipeline link problem leading to mixture losses of hot and cold liquid desiccants is found. These pipelines are modified. Then, the performance of the modified processor is investigated. And the experimental results show that with an outdoor air temperature of 25 to 32°C and an outdoor air humidity ratio of 18 to 21 g/kg, the supply air temperature and the supply air humidity ratio are 3.2 to 4.0°C and 3.4 to 3.6 g/kg, respectively, and the COP is 2.8.Finally, a mathematical model of the processor is established. The comparison of the simulation results and the test results of the processor exhibits that the pipeline modification improves the performance by about 20%. © right.