New Water Adsorbent for Adsorption Driven Chillers
Abstract
A new water adsorbent for thermally driven adsorption chillers was developed. A stable microporous aluminophosphate with ordered microporous 3-dimensional channel structure and high surface area (784 m2/g) was prepared. The material adsorbs water in a very narrow relative-pressure range and can be charged at 65 oC. The material shows a very good thermal stability up to 850 ºC, hydrothermal stability and a water adsorption capacity up to 0.42 g/g. The cooling enthalpy of 730 kJ/kg and COP 0.7 is determined for the boundary conditions: evaporator temperature of 5 oC, cooling temperature of 30 oC and desorption temperature of 65 oC. As such, it exhibits exceptional properties for applications in cooling devices.