为解决转轮预加湿空气取水技术需要引入额外热源导致部分工况能效偏低的问题，该文提出一种结合双级转轮和热泵的空气取水装置，建立机组的数值模拟模型，并研究其在多类气候条件下的空气处理流程及取水性能。首先探讨了机组在两类极端工况，即：干冷工况（5 ℃，含湿量4.88 g/kg，相对湿度90%）与干热工况（46 ℃，含湿量6.29 g/kg，相对湿度10%）下的取水量和取水能效（ewh）等其他参数。结果表明，该机组在这两个工况下均满足12.5 L/d的目标日取水量，ewh分别达到2.40 kg/(kW∙h)与1.49 kg/(kW∙h)。干热工况下，热回收可有效降低压缩机功率，而其在干冷工况下的节能效果不明显。进而，以新疆喀什月平均温度和湿度为典型工况，探讨采用热回收前后的机组性能。该机组在3~11月的日取水量达标，1—2月和12月的日取水量为目标值的49.6%~82.4%。开启热回收后，压缩机功率降低2.9%~50.6%，ewh提升3.2%~101.9%。

To solve the problem of reduced energy efficiency in some working conditions due to the need for an extra heat source in desiccant wheel-assisted pre-humidification air water harvesting systems, this paper proposes an air water harvesting device combining a two-stage desiccant wheel and a heat pump, builds a numerical simulation model, and studies its optimal air treatment process and water harvesting performance under various climates. It first analyzes water production, water harvesting efficiency (ewh) and other parameters under two extreme conditions: extremely humid-cold (5 oC, specific humidity 4.88 g/kg, 90% RH, RH for relative humidity) and extremely dry-hot (46 oC, specific humidity 6.29 g/kg, 10% RH, RH for relative humidity). Results show the unit achieves the target daily water production of 12.5 L/d under both conditions, with ewh of 2.40 kg/(kW·h) and 1.49 kg/(kW·h) respectively. Heat recovery effectively cuts compressor power under the dry-hot condition, but shows little energy-saving effect under the humid-cold condition. Taking monthly average temperature and humidity in Kashi, Xinjiang as typical conditions, this paper further evaluates unit performance with and without heat recovery. Daily water production meets the target from March to November, and reaches 49.6%–82.4% of the target in January, February and December. With heat recovery, compressor power drops by 2.9%–50.6%, and ewh rises by 3.2%–101.9%.