Novel ammonia sorbents “porous matrix modified by active salt” for adsorptive heat transformation: 3. Testing of “BaCl2/vermiculite” composite in a lab-scale adsorption chiller

A composite adsorbent composed of BaCl2 impregnated into expanded vermiculite has been synthesized and tested in a laboratory scale adsorption chiller. Previous work has established the promising theoretical performance of this adsorbent with ammonia as a refrigerant, in terms of equilibrium uptake, suitable equilibrium temperatures for use in air conditioning applications and good reaction dynamics. Analysis of the adsorption phase revealed a simple exponential approach to equilibrium uptake which was not previously observed in larger scale experiments. It was demonstrated that this material can provide effective operation of the chiller using a low potential heat source (80-90 degrees C) giving COP as high as 0.54 +/- 0.01 and SCP ranging from 300 to 680 W/kg,. The specific cooling power depends strongly on the driving temperature difference and the cycle duration. (C) 2010 Elsevier Ltd. All rights reserved.

[1]  Yuri I. Aristov,et al.  Novel ammonia sorbents porous matrix modified by active salt for adsorptive heat transformation: 2. Calcium chloride in ACF felt , 2010 .

[2]  Yuri I. Aristov,et al.  Isothermal sorption characteristics of the BaCl2–NH3 pair in a vermiculite host matrix , 2007 .

[3]  Ruzhu Wang,et al.  Compound adsorbent for adsorption ice maker on fishing boats , 2004 .

[4]  L. L. Vasiliev,et al.  NaX zeolite, carbon fibre and CaCl2 ammonia reactors for heat pumps and refrigerators , 1996 .

[5]  Xiulan Huai,et al.  Study on fluid–solid coupling heat transfer in fractal porous medium by lattice Boltzmann method , 2010 .

[6]  Yuri I. Aristov,et al.  Optimal adsorbent for adsorptive heat transformers: Dynamic considerations , 2009 .

[7]  Yuri I. Aristov,et al.  The effect of cycle boundary conditions and adsorbent grain size on the water sorption dynamics in adsorption chillers , 2010 .

[8]  Yuri I. Aristov,et al.  Novel ammonia sorbents porous matrix modified by active salt for adsorptive heat transformation 1. Barium chloride in various matrices , 2010 .

[9]  Ruzhu Wang,et al.  Composite adsorbent of CaCl2 and expanded graphite for adsorption ice maker on fishing boats , 2006 .

[10]  Vasily E. Sharonov,et al.  Ammonia sorption on composites ‘CaCl2 in inorganic host matrix’: isosteric chart and its performance , 2006 .

[11]  B. Dawoud,et al.  A new methodology of studying the dynamics of water sorption/desorption under real operating conditions of adsorption heat pumps: Experiment , 2008 .

[12]  B. Spinner,et al.  Optimization of a chemical heat pump: Energetic density and power , 1993 .

[13]  Bernard Spinner,et al.  A new analytical model for solid-gas thermochemical reactors based on thermophysical properties of the reactive medium , 1997 .