Passive Cooling System Integrating Two PCM Layers Aided with Personal Evaporative Cooling and Desiccant-Trombe Wall Dehumidification for Hot-Humid Climate

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Conference Proceeding by ASHRAE, 2020



This study investigates the performance of a passive cooling system for an office space in hot humid climate. The hybrid system combines two phase change material (PCM) storage layers with a melting temperatures of 24 ºC (75.2 ºF) and 27 ºC (80.6 ºF) to cool the supply air and a personalized evaporative cooler (PEC) system to provide local cooling for the occupants. In addition, humidity of the supply air is controlled using a solid desiccant wheel regenerated via an auxiliary heater assisted with a Trombe wall. Moreover, an evaporative cooler and a sensible wheel are used to assist in cooling the supply air. The combined system can be used primarily for hot humid climates in office spaces. The system should meet the space load, indoor air quality, and minimum fresh air requirements set by ASHRAE standards and should provide thermal comfort during daytime with minimum electric energy consumption by using only small fans and an auxiliary heater. Mathematical models for each component have been implemented to simulate their performance and then evaluate the performance of the overall system. A case study for an office space (8m (26.3 ft) ×7m (22.9 ft) ×3m (9.8 ft)) located in Beirut is developed to assess the performance of the proposed hybrid cooling system during the summer months and to check the resultant overall thermal comfort of the occupants. The results showed that the system is feasible as it achieves cost savings amounting to 88% compared with the conventional air conditioning systems currently employed in Beirut. The proposed double layered system also achieved 14% water savings compared with a single thermal storage PCM layer.

Citation: 4th Intl Conf: Efficient Bldg Design

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