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A platform for research: civil engineering, architecture and urbanism
Performance analysis of a novel liquid desiccant evaporative cooling fresh air conditioning system with solution recirculation
AbstractLiquid desiccant evaporative cooling air-conditioning (LDECAC) system, which combines both advantages of liquid desiccant and evaporative cooling technology, has a great potential to utilize low-grade heat for refrigeration and air conditioning. A novel LDECAC system is proposed to obtain lower supply air temperature and humidity ratio at the expense of less thermal energy consumption when used as a dedicated fresh air system. It consists of a liquid desiccant system with self-cycle solution at dehumidification and regeneration sides, a regenerative indirect evaporative cooler (RIDEC) and a direct evaporative cooler with adjustable by-pass flow. A parametric study on steady-state thermal performance of LDECAC system was performed based on the developed mathematical model. The performance was investigated by varying five key parameters: solution self-cycle ratio (Rs), working to intake air flow ratio (Ra), regeneration temperature, ambient air temperature and humidity ratio. The results show that the system can handle the process air to 17.9 °C and 9.2 g/kg with the thermal coefficient of performance of 0.56 under the design condition. The recommended value for Rs lies between 0.6 and 0.7 and that for Ra is 0.2 under the typical operating condition. The variable Rs control method is effective in response to the change of ambient air conditions. Performance comparison with the conventional LDECAC system shows that the novel system can utilize lower temperature heat source and achieve a higher thermal coefficient of performance.
HighlightsA hybrid LDECAC system with solution recirculation is proposed.A detailed mathematical model for performance evaluation is developed.Effects of Ra and Rs on system overall performance are analyzed.The variable Rs control method is effective under the varying ambient conditions.Performance comparison with conventional LDECAC system is conducted.
Performance analysis of a novel liquid desiccant evaporative cooling fresh air conditioning system with solution recirculation
AbstractLiquid desiccant evaporative cooling air-conditioning (LDECAC) system, which combines both advantages of liquid desiccant and evaporative cooling technology, has a great potential to utilize low-grade heat for refrigeration and air conditioning. A novel LDECAC system is proposed to obtain lower supply air temperature and humidity ratio at the expense of less thermal energy consumption when used as a dedicated fresh air system. It consists of a liquid desiccant system with self-cycle solution at dehumidification and regeneration sides, a regenerative indirect evaporative cooler (RIDEC) and a direct evaporative cooler with adjustable by-pass flow. A parametric study on steady-state thermal performance of LDECAC system was performed based on the developed mathematical model. The performance was investigated by varying five key parameters: solution self-cycle ratio (Rs), working to intake air flow ratio (Ra), regeneration temperature, ambient air temperature and humidity ratio. The results show that the system can handle the process air to 17.9 °C and 9.2 g/kg with the thermal coefficient of performance of 0.56 under the design condition. The recommended value for Rs lies between 0.6 and 0.7 and that for Ra is 0.2 under the typical operating condition. The variable Rs control method is effective in response to the change of ambient air conditions. Performance comparison with the conventional LDECAC system shows that the novel system can utilize lower temperature heat source and achieve a higher thermal coefficient of performance.
HighlightsA hybrid LDECAC system with solution recirculation is proposed.A detailed mathematical model for performance evaluation is developed.Effects of Ra and Rs on system overall performance are analyzed.The variable Rs control method is effective under the varying ambient conditions.Performance comparison with conventional LDECAC system is conducted.
Performance analysis of a novel liquid desiccant evaporative cooling fresh air conditioning system with solution recirculation
Zhang, Fan (author) / Yin, Yonggao (author) / Zhang, Xiaosong (author)
Building and Environment ; 117 ; 218-229
2017-03-09
12 pages
Article (Journal)
Electronic Resource
English
Novel Desiccant Cooling System Using Indirect Evaporative Cooler
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