Regenerative Zeolite Heat Pump

High-efficient thermochemical sorption refrigeration driven by low-grade thermal energy

“…1-NH 3 ; 2-PbCl 2 (8/3.25); 3-BaCl 2 (8/0); 4-LiCl (4/3); 5-AgCl (3/1.5); 6-CaCl 2 (8/4); 7-SrCl 2 (8/1); 8-CaCl 2 (4/2); 5-CdCl 2 (6/2); 10-ZnCl 2 (6/2); 11-MnCl 2 (6/2); 12-FeCl 2 (6/2); 13-CoCl 2 (6/2); 14-MgCl 2 (6/2); 15-NiCl 2 (6/2). low-temperature bed due to the temperature difference during the switching process [13][14][15]23] . The decrease in heat consumption enhanced the working performance of sorption refrigerator.…”

Review of Regenerative Adsorption Heat Pumps

“…The theoretical maximum efficiency for thermal wave regeneration is 100% for an infinitesimal temperature difference between the heat transfer fluid and the adsorbent; however, the practical limit for thermal wave regeneration has been estimated at 85%. 13,14 What may seem like a modest improvement in regeneration from, say, 70% to 80% would significantly boost efficiency. A 70% heat regeneration requires 30% make-up heat; an 80% heat regeneration requires 20% make-up heat, or 1 3 less than 30% make-up heat, thereby increasing COP C by a factor of 1.5.…”

“…Some investigators have employed the shell and tube heat exchanger, while others used a serpentine flat pipe winding between a stack of consolidated adsorbent bricks. 13,14,16,19,49 Wang et al 63 proposed a spiral strip or tape type adsorber coupled with a solar collector (Fig. 13).…”

“…Some designs use packed beds of spheres, resulting in a very low effective thermal conductivity for the adsorbent. None of list of refrigerants and their adsorptivity (kg/kg) in various adsorbents at 1 atm and 25 • C (298 K) 14,49 the studies reviewed considers settling of the adsorbent particles or pellets, which may cause the adsorbent to lose contact with the heat exchanger.…”

Adsorption cooling cycles for alternative adsorbent/adsorbate pairs working at partial vacuum and pressurized conditions

“…Recently, extensive effort has been put in to investigate the possible adsorption working pairs [6][7][8][9]. The performance of zeolite/water [10], activated carbon/ammonia [11], activated carbon/ methanol [12], and silica gel/water [13][14][15] have been analyzed. The adsorption parameters enable the derivation of the relationship between adsorption uptake (the quantity of adsorbate adsorbed per unit mass of adsorbent), adsorption pressure and temperature.…”