Abstract
Here, we propose a double-effect adsorption chiller with a zeolite adsorbent (FAM-Z01) for utilization of waste heat. The FAM-Z01 adsorbent has the potential to recover waste heat in low temperatures ranging from 353 to 333 K and shows good potential in the adsorption chiller in terms of the high cooling output. A double-effect adsorption chiller could provide a higher Coefficient Of Performance (COP) than that of a single-effect chiller. In this paper, we developed a measuring method for the amount of adsorption in the first and second adsorber in a double-effect adsorption chiller and measured the adsorption and desorption rate based on the volumetric method. We calculated the COP of the adsorption chiller with the quantity of adsorbent obtained in the experiment. In the experiments, the quantity of adsorbent in the first adsorber was 0.14 g-H2O/g-Ads at the pressure 20 kPa and a desorption temperature over 100℃. The amount of adsorbent in the second adsorber was equal to that of the first adsorber. By analyzing the COP with the experimental results, the COP value was calculated to be over 1.0 (–) at any desorption temperature. The COP of the double-effect cycle was higher than that of single-effect cycle.
Highlights
In response to increasing energy consumption since the Industrial Revolution, the amount of industrial waste heat has been rising
A doubleeffect adsorption chiller could provide a higher Coefficient Of Performance (COP) than that of a single-effect chiller
We developed a measuring method for the amount of adsorption in the first and second adsorber in a double-effect adsorption chiller and measured the adsorption and desorption rate based on the volumetric method
Summary
In response to increasing energy consumption since the Industrial Revolution, the amount of industrial waste heat has been rising. The FAM-Z01, in the first adsorber B1, desorbs at a high heat source temperature. In a double-effect adsorption chiller cycle, it is desirable for the desorption temperature and pressure of the first adsorber to be high because the condensation heat of H2O vapor from the first adsorber was utilized for heat desorption in the second adsorber. Adsorption isotherm and adsorption/desorption rate characteristics of a double-effect cycle with FAM-Z01 have been investigated. The adsorption isotherms of water on FAM-Z01 are available for low temperature exhaust heat at approximately 60 ̊C. In this experiment, the sample diameter was under 5 μm. An adsorbent sample was out gassed at 90 ̊C for 24 h inside vacuum
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