LAUSR

ABSTRACT A traditional adsorption refrigeration system cannot run under ultra-low grade heat source temperatures. In order for ultra-low grade heat utilization, a multi-mode integrated system of adsorption refrigeration using desiccant coated heat exchangers (DCHEs) is proposed. The key point of this integrated system is the rise in evaporation temperature by the use of DCHEs, which contributes to lowing the driving temperature and enhancing the system performance. A mathematical model based on the first and second law of thermodynamics perspective is developed, and the performance investigation is conducted to understand the effect of different modes, driving and medium temperatures. The results reveal that Mode 1 has a wider working range, Mode 2 has better performance and Mode 3 can realize the cogeneration of chilled water and dehumidified air. Compared to a traditional system, the integrated system has obviously lower driving temperature and higher performance. The integrated system with Modes 1 and 2 can operate effectively at driving temperatures below 50 oC and its maximum COP and exergetic efficiency can reach around 0.8 and 0.21, respectively. For ultra-low grade heat utilization, the medium temperature has a greater effect on the COP and equal effect on the exergetic efficiency to driving temperature.