Abstract
To solve indoor high humidity problem in nZEB (nearly zero energy buildings) in hot and humid climate zone, a coupled heat pump desiccant wheel system is studied by adopting in a scenario of nearly zero energy residence with experimental and simulation method, for seasonal time scale. Dehumidification is achieved by pre-cooling evaporator, desiccant wheel and indoor evaporator. A heat recovery condenser is adopted for desiccant wheel regeneration. Firstly, the dehumidification rate proportion of the pre-cooling evaporator, desiccant wheel and the indoor evaporator is evaluated for three typical operation conditions. Secondly, with an innovative indicator, humidity energy ratio, the pre-cooling evaporator outlet air temperature is optimized in summer and dehumidification season. At last, the system performance is analyzed by comparing with a conventional air conditioner. The results showed that, compared with conventional air conditioners, the system has an overall performance improvement in indoor environment control and energy saving. With optimized pre-cooling evaporator outlet air temperature of 14 °C, indoor relative humidity is lower than 70% with 26 °C, for about 96% of the times. Around 9.4% and 14.9% of energy can be saved in summer and dehumidification season, separately.
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