Study of the new composite adsorbent of salt LiCl/silica gel–methanol used in an innovative adsorption cooling machine driven by low temperature heat source

An adsorption cooling machine with LiCl/Silica gel–methanol was designed and tested, which can work for air conditioning and cold storage. The machine can be driven by low temperature heat source, such as solar energy and industrial waste heat. The composite adsorbent of LiCl/Silica gel has higher adsorption capacity and the methanol has a higher working pressure. So, the cooling performance, system's reliability and the adsorbent's mass transfer performance can be improved. The adsorption machine was experimentally investigated. The test results show that the cycle time and heat recovery process has more influence on COP (Coefficient of Performance) than on cooling capacity. The mass recovery process has significant influence both on cooling capacity and COP. When the cycle time is prolonged from 460 s to 760 s, the cooling capacity and COP increased by 4.3% and 20.6%, respectively. When the hot water inlet temperature, cooling water inlet temperature, cooling medium outlet temperature and heat recovery time are 75 °C, 31 °C, 5 °C and 60 s, respectively, the cooling capacity is improved by 6.3% by heat recovery process while the COP is improved by 27.3%. When the mass recovery time extends from 50 s to 120 s, the cooling capacity and COP increase by 68.4% and 53.3%. When the hot water inlet temperature is about 88 °C, the cooling water inlet temperature is about 25 °C, the adsorption machine produced -4 °C of cooling medium, the cooling capacity and COP were about 1.0 kW and 0.13, respectively.

[1]  Ruzhu Wang,et al.  Adsorption refrigeration- : An efficient way to make good use of waste heat and solar energy , 2006 .

[2]  Ruzhu Wang,et al.  Optimum Matching of Heat Source Temperature to a Solar Adsorption Air-Conditioning System for Maximum Solar Cooling Coefficient of Performance , 2010 .

[3]  Ruzhu Wang,et al.  Experimental study on an adsorption chiller employing lithium chloride in silica gel and methanol , 2012 .

[4]  Ruzhu Wang,et al.  Development of a new synthesized adsorbent for refrigeration and air conditioning applications , 2006 .

[5]  Kim Choon Ng,et al.  Experimental investigation of silica gel-water adsorption chillers with and without a passive heat recovery scheme , 2005 .

[6]  K. F. Fong,et al.  Comparative study of different solar cooling systems for buildings in subtropical city , 2010 .

[7]  Li Yong,et al.  Modeling and simulation of a solar powered two bed adsorption air conditioning system , 2004 .

[8]  Takao Kashiwagi,et al.  Computer simulation of a silica gel-water adsorption refrigeration cycle - the influence of operating conditions on cooling output and COP , 1995 .

[9]  K. Ng,et al.  Waste heat driven dual-mode, multi-stage, multi-bed regenerative adsorption system , 2003 .

[10]  S. Riffat,et al.  Theoretical and Experimental Investigation of a Two-Bed Adsorption System Using a Novel Adsorber Configuration , 2007 .

[11]  G. Cacciola,et al.  A family of new working materials for solid sorption air conditioning systems , 2002 .

[12]  Ruzhu Wang,et al.  Experimental comparison of two honeycombed desiccant wheels fabricated with silica gel and composite desiccant material , 2006 .

[13]  A. Freni,et al.  Composites “lithium halides in silica gel pores”: Methanol sorption equilibrium , 2008 .

[14]  K. Daou,et al.  Desiccant cooling air conditioning : a review , 2006 .

[15]  Zacharie Tamainot-Telto,et al.  Solar sorption refrigerator , 1997 .

[16]  Kamaruzzaman Sopian,et al.  Review on solar-driven ejector refrigeration technologies , 2009 .

[17]  Tomas Nunez,et al.  Development of an adsorption chiller and heat pump for domestic heating and air-conditioning applications , 2007 .

[18]  Fabio Polonara,et al.  Simulation of a solid sorption ice-maker based on the novel composite sorbent "lithium chloride in silica gel pores" , 2009 .

[19]  Ruzhu Wang,et al.  Literature review on solar adsorption technologies for ice-making and air-conditioning purposes and recent developments in solar technology , 2001 .

[20]  X. Zhai,et al.  Solar integrated energy system for a green building , 2007 .

[21]  K. Sumathy,et al.  A solar-powered ice-maker with the solid adsorption pair of activated carbon and methanol , 1999 .

[22]  Tsair-Wang Chung,et al.  Effects of the thickness and particle size of silica gel on the heat and mass transfer performance of a silica gel-coated bed for air-conditioning adsorption systems , 2005 .