Improving the Coefficient of Performance of A Two-Bed Adsorption Chiller Via A Passive Regeneration Scheme

摘要

The adsorption refrigeration cycle is known for its efficient extraction of energy from a low-temperature waste-heat source and use of environmentally benign materials such as silica gels as the adsorbent and water as the refrigerant. Such a chiller design has no major moving parts except for the valves and thus requires minimal maintenance. In this paper, we shall present a passive regenerative scheme that targets at significantly improving the COP of the chiller. This scheme requires no fluid recirculation pump and additional valves as well as piping other than those already found in a standard two-bed adsorption chiller design. We shall first present the experimental data of a standard two-bed chiller as a benchmark and then experimentally demonstrate the significant improvement achieved using the passive regenerative scheme. COP boosting by as much as 38% can be achieved and the highest COP achieved is 0.46.