The Simulation Performance of Three-bed Silica Gel Conventional Re-heat Combined Adsorption Cycle

Wirajati, I Gusti Agung Bagus (2015) The Simulation Performance of Three-bed Silica Gel Conventional Re-heat Combined Adsorption Cycle. In: The 14th International Conference on QiR (Quality in Research) 2015, 10-13 Agustus 2015, Lombok-Indonesia.

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Abstract

In this paper, a new operational strategy is proposed for re-heat adsorption chiller with multi beds. Silica-gel and water are using as the adsorbent and refrigerant pairs in this chiller. The chiller consists of three adsorbed/desorber heat exchanger, one evaporator and one condenser. Combined cycle refers to the adsorber/desorber of HEXs that are HEX1 and HEX2 operate in re- heat cycle while HEX3 operates conventional cycle respectively. MATLAB with ode 45 solver was the governing equations of the present chiller. The chilled water out temperature was kept constant at 9°C to produce cooling effect. The objectives of the present study were to operate the chiller at low heat source temperature so that it can be driven with solar or waste heat, and to reduce the chiller size. The effect of heat source temperature and the effect of mass recovery time are presented while the effect of the combination between adsorption/desorption and pre-heating/pre-cooling time also explored to predict the performance on COP and cooling capacity of the chiller. The proposed chiller provides COP values higher than provided by the four-hex reheat chiller and 42% higher of the cooling capacity values compared than the conventional cycle respectively.

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