Composite adsorbents of CaCl<sub>2</sub> and sawdust prepared by carbonization for ammonia adsorption refrigeration

doi:10.1007/s11708-012-0207-9

Front Energ

2012, Vol. 6

Issue (4) : 356-360 https://doi.org/10.1007/s11708-012-0207-9

FEATURE ARTICLE

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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Abstract

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 Author(s): BU Xianbiao,Email:buxb@ms.giec.ac.cn

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.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-012-0207-9
https://academic.hep.com.cn/fie/EN/Y2012/V6/I4/356

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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