الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 96 |  |  |
| | | from | 96 | | |
Abstract
Recently, adsorption cooling and desalination systems have received much attention due to their feasibility to decarbonize cooling and desalination industries. Many endeavors have been made for increasing the performance of the adsorption systems via finding new adsorption materials and improving the adsorption and the thermal characteristics for the existing materials like silica-gel. In this work, a combination of these two approaches is numerically investigated for adsorption cooling and desalination systems using copper foams with a new adsorption material named MOF-801. The study aims at comparing the performance of MOF-801 to that of silica-gel in a new bed design in which a highly porous structure from copper foams is applied directly on the external surface of the bed copper tubes and packed with the two adsorption materials. Using copper foams significantly improves the bulk thermal conductivity of the adsorption bed for both materials and strengthens its structure rigidity. The system performance with the proposed bed configuration was numerically evaluated for both MOF-801 and silica-gel systems using a developed MATLAB code. This model is able to simulate the metallic foamed beds alongside with the finned tube heat exchanger beds. The model has low computational cost which enables it to get more insight and understanding of the influence of changing the geometrical and the operational parameters of the adsorption beds on the operation performance. The impacts of changing the bed height, cycle time, heating water inlet temperature, cooling water inlet temperature, and chilled water inlet temperature on the overall performance of both the MOF-801 and the silica-gel based systems are evaluated and compared on the system level. The results illustrated significant enhancements in the effective thermal conductivity for both beds leading to an improvement in the overall performance under different operating conditions. MOF-801-based system showed a higher performance for desalination application with a maximum specific daily water production of 16.7m3⁄ton/day compared to 15.5 m3⁄ton/day for the silica gel-based system at cycle time 400 s, heating water inlet temperature of 85 ºC, cooling water inlet temperature of 30 ºC, and chilled water inlet temperature of 30 ºC. Also, MOF-801-based system evidenced its competition to silica-gel based system in the cooling applications with achieving maximum specific cooling power and specific volumetric cooling power equal 466 W/kg and 216 kW/m3, respectively, compared to 440 W/kg and 305 kW/m3, respectively, for silica gel-based system at the same operation condition. MOF-801 based system achieved a COP of 0.683 at bed height 24 mm compared to 0.8 for silica gel-based system at bed height 20 mm at the same operation condition. Increasing the cycle to 1000 s with decreasing the chilled water inlet temperature to 15 ºC improves the COP of MOF-801 based system to 0.7 compared to 0.76 for silica gelbased system at bed height 20 mm.