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Frontiers in Energy

Front Energ    2012, Vol. 6 Issue (4) : 356-360
Composite adsorbents of CaCl2 and sawdust prepared by carbonization for ammonia adsorption refrigeration
Huashan LI1, Xianbiao BU2(), Lingbao WANG1, Zhenneng LU1, Weibin MA2
1. Key Laboratory of Renewable Energy and Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China; Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 2. Key Laboratory of Renewable Energy and Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
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Composite adsorbents of CaCl2 and sawdust prepared by carbonization for adsorption refrigeration with NH3 as refrigerant are tested, and the effects of carbonization temperature on the sorption capacity and rate are analyzed. The results show that the amount of pores in the sawdust of the composite adsorbents carbonized, apart from the content of CaCl2, is the most dominant factor influencing the NH3 sorption on composite adsorbents. The optimum carbonization temperature is 700°C, which gives the maximal NH3 sorption capacity as high as 0.774 kg of NH3 per kg of the composite, and the specific cooling power is approximately between 338 and 869 W/kg with the cycle duration varying from 5 to 20 minutes. The present study demonstrates that the composite absorbent of CaCl2 and sawdust prepared by carbonization is more promising and competitive for adsorption refrigeration application.

Keywords adsorption refrigeration      composite adsorbent      calcium chloride      sawdust      carbonization     
Corresponding Authors: BU Xianbiao,   
Issue Date: 05 December 2012
 Cite this article:   
Huashan LI,Xianbiao BU,Lingbao WANG, et al. Composite adsorbents of CaCl2 and sawdust prepared by carbonization for ammonia adsorption refrigeration[J]. Front Energ, 2012, 6(4): 356-360.
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Huashan LI
Xianbiao BU
Lingbao WANG
Zhenneng LU
Weibin MA
SampleInitialCarbonizationAfter carbonization
Weight/gTemperature/°CTemperature/°CBurn off of sawdust/%Weight/gContent of CaCl2/%
Sample 1302740034.6525.1863.90
Sample 2302750042.7124.0666.88
Sample 3202755046.2615.7168.28
Sample 4302560046.8823.4868.53
Sample 5202765048.8515.4769.34
Sample 6252470052.7118.8970.99
Sample 7302575053.2722.5971.23
Sample 8302580053.3522.5871.26
Tab.1  Information of the carbonization of eight composite adsorbents
Fig.1  Experimental set-up (1 is a high-pressure container of NH, 2 and 11 are constant temperature water baths, 3 is a buffer tank of NH, 4, 5, 7 and 8 are valves, 6 and 9 are pressure sensors, and 10 is an adsorber)
Fig.2  NHsorption capacity of the composite adsorbent with different carbonization temperatures
Fig.3  SEM photographs of the composite adsorbents with the carbonization temperatures
(a) 550°C; (b)700°C; (c) 800°C
Fig.4  Sorption rates of the composite adsorbents with different carbonization temperatures against the adsorption time
Fig.5  SCP of the composite adsorbent carbonized at 700 C
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