固体吸附式制冷系统中吸附剂粒径及吸附床总孔隙率对吸附床传热性能的影响研究
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摘要
文章采用数值模拟方法研究了圆筒型吸附床的二维非稳态脱附传热过程,并基于综合导热系数和接触热阻分析了吸附剂的粒径和吸附床的总孔隙率对吸附床传热性能的影响,以及吸附床的总孔隙率与吸附剂粒径的最优组合。分析结果表明:当吸附床的总孔隙率较大时,吸附剂粒径对吸附床传热性能的影响更为明显,且吸附剂粒径越小,吸附床的传热性能越好;随着吸附剂粒径逐渐增大,吸附床总孔隙率对吸附床传热性能的影响呈现出不同的变化趋势;当吸附剂的粒径较小且吸附床的总孔隙率较大时,吸附床的传热性能最优。
In this paper, a transient two dimensional modle of a granular adsorbent bed, which is verified by expriments, is developed to discuss the integrate influence of adsorbent particle diameter and total porosity on thermal performance during desorption process from the aspects of the coefficient of heat transfer and thermal contact resistance. Besides, the best particle diameter matching with total porosity is exanmined in details. The results show that the growing effect of particle diameter is observed under higher total porosity, and smaller grain size will enhance thermal performance. While the effect of total porosity on thermal performance turns reversely with the increase of adsorbent grain size. In addtion, the smaller size of adsorbent paticle associated with larger total porosity will be a good choice for acheving better thermal performance.
In this paper, a transient two dimensional modle of a granular adsorbent bed, which is verified by expriments, is developed to discuss the integrate influence of adsorbent particle diameter and total porosity on thermal performance during desorption process from the aspects of the coefficient of heat transfer and thermal contact resistance. Besides, the best particle diameter matching with total porosity is exanmined in details. The results show that the growing effect of particle diameter is observed under higher total porosity, and smaller grain size will enhance thermal performance. While the effect of total porosity on thermal performance turns reversely with the increase of adsorbent grain size. In addtion, the smaller size of adsorbent paticle associated with larger total porosity will be a good choice for acheving better thermal performance.
引文
[1]游洵,刘芙蓉.带升压变压器的光伏并网逆变器控制与实现[J]可再生能源,2017,35(2):259-263.
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[7] Niazmand H, Talebian H, Mahdavikhah M. Effects of particle diameter on performance improvement ofadsorption systems[J].Applied Thermal Engineering,2013,59:243-252.
[8] Chakraborty A, Saha B B, Aristov Y I. Dynamic behaviors of adsorption chiller:Effects of the silica gel grain size and layers[J].Energy,2014,78:304-312.
[9] Demir H, Mobedi M,lküS. Effects of porosity on heat and mass transfer in a granular adsorbent bed[J].International Communications in Heat&Mass Transfer,2009,36(4):372-377.
[10] Leong K C,Liu Y.Numerical modeling of combined heat and mass transfer in the adsorbent bed of a zeolite/water cooling system[J].Applied Thermal Engineering,2004,24(16):2359-2374.
[11] Ismail Solmu, CemilYamal, CihanYldrm, et al.Transient behavior of a cylindrical adsorbent bed during the adsorption process[J].Applied Energy,2015,142(142):115-124.
[12] Zhang L Z,Wang L.Effects of coupled heat and mass transfers in adsorbent on the performance of a waste heat adsorption cooling unit[J].Applied Thermal Engineering,1999,19(2):195-215.
[13] Freni A, Tokarev M M, Restuccia G, et al.Thermal conductivity of selective water sorbents under the working conditions of a sorption chiller[J].Applied Thermal Engineering,2002,22(14):1631-1642.
[14] M M Tokarev, B N Okunev, M S Safonov, et al.Approximation equations for describing the sorption equilibrium between water vapor and a CaCl2-in-silica gel composite sorbent[J].Russian Journal of Physical Chemistry,2005,79(9):1490-1493.
[15] Pola nyi M. Theories of the adsorption of gases[J].Transactions of the Faraday Society,1932,28(2):350-360.
[16] Sakoda A, Suzuki M. Fundamental study on solar powered adsorption cooling system[J].Journal of Chemical Engineering of Japan,1984,17(1):52-57.
[17] Di J, Wu J Y, Xia Z Z, et al. Theoretical and experimental study on characteristics of a novel silica gel-water chiller under the conditions of variable heat source temperature[J].International Journal of Refrigeration,2007,30(3):515-526.
[2]王如竹.吸附式制冷[M].北京:机械工业出版社,2002.
[3]桂贤,吴立志.太阳能固体吸附式制冷系统吸附床内单元管传热传质分析[J].北京石油化工学院学报,2004,12(4):1-5.
[4]王令宝,卜宪标,马伟斌.采用复合吸附剂和高效吸附床的吸附制冷机性能测试[J].可再生能源,2012,30(3):97-101.
[5]狄杰.基于太阳能的吸附式制冷机变热源特性及运行策略研究[D].上海:上海交通大学,2007.
[6] Huang H, Zhaohong H E, Yuan H, et al. Effect of adsorbent diameter on the performance of adsorption refrigeration[J].Chinese Journal of Chemical Engineering,2014,22(5):602-606.
[7] Niazmand H, Talebian H, Mahdavikhah M. Effects of particle diameter on performance improvement ofadsorption systems[J].Applied Thermal Engineering,2013,59:243-252.
[8] Chakraborty A, Saha B B, Aristov Y I. Dynamic behaviors of adsorption chiller:Effects of the silica gel grain size and layers[J].Energy,2014,78:304-312.
[9] Demir H, Mobedi M,lküS. Effects of porosity on heat and mass transfer in a granular adsorbent bed[J].International Communications in Heat&Mass Transfer,2009,36(4):372-377.
[10] Leong K C,Liu Y.Numerical modeling of combined heat and mass transfer in the adsorbent bed of a zeolite/water cooling system[J].Applied Thermal Engineering,2004,24(16):2359-2374.
[11] Ismail Solmu, CemilYamal, CihanYldrm, et al.Transient behavior of a cylindrical adsorbent bed during the adsorption process[J].Applied Energy,2015,142(142):115-124.
[12] Zhang L Z,Wang L.Effects of coupled heat and mass transfers in adsorbent on the performance of a waste heat adsorption cooling unit[J].Applied Thermal Engineering,1999,19(2):195-215.
[13] Freni A, Tokarev M M, Restuccia G, et al.Thermal conductivity of selective water sorbents under the working conditions of a sorption chiller[J].Applied Thermal Engineering,2002,22(14):1631-1642.
[14] M M Tokarev, B N Okunev, M S Safonov, et al.Approximation equations for describing the sorption equilibrium between water vapor and a CaCl2-in-silica gel composite sorbent[J].Russian Journal of Physical Chemistry,2005,79(9):1490-1493.
[15] Pola nyi M. Theories of the adsorption of gases[J].Transactions of the Faraday Society,1932,28(2):350-360.
[16] Sakoda A, Suzuki M. Fundamental study on solar powered adsorption cooling system[J].Journal of Chemical Engineering of Japan,1984,17(1):52-57.
[17] Di J, Wu J Y, Xia Z Z, et al. Theoretical and experimental study on characteristics of a novel silica gel-water chiller under the conditions of variable heat source temperature[J].International Journal of Refrigeration,2007,30(3):515-526.
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