Comparison Simulation between Ventilation and Recirculation of Solar Desiccant Cooling System by TRNSYS in Hot and Humid Area MMS DEZFOULI, SOHIF MAT, K.SOPIAN Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia 43600 UKM Bangi, Selangor, MALAYSIA. Email: [email protected]; [email protected]Abstract: Two modeling of solar desiccant cooling system in different modes of ventilation and recirculation were designed based on hot and humid weather of Malaysia. The latent load and sensible load of the test room were 12283.71 BTU/hr, 37533.56 BTU/hr respectively. The mass flow rates of process air and regeneration air were 0.86 kg/s. The effectiveness of components is selected based on high efficent system because the main objective of this study is comparison between ventilation and recirculation modes. By investigation of simulation results of ventilation and recirculation modes, it was found that, amount of ventilation and recirculation COP were 0.8, and 1.6 respectively. Therefore it was achieved that the recirculation solar desiccant cooling system in hot and humid area is higher efficent than the ventilation solar desiccant cooling system. . Keywords: desiccant cooling, ventilation, recirculation, solar energy 1. Introduction Due to high electrical consumption of conventional vapor compression systems, solar desiccant cooling system is one of the promising alternatives to cooling air where sensible and latent heats of air are being removed separately [1]. The first desiccant cooling system was recorded by Pennington in 1955 [2]. Generally, depending on using dehumidification material, there is two kind of desiccant cooling system: solid and liquid. Many Scientifics and researchers have studied in both kinds of desiccant cooling by using renewable energy [3]. The common materials used in solid and liquid desiccant cooling system were selii- cagel, and, liquid water-lithium chloride. Desiccant cooling system is including of three main units such as desiccant unit, heat source unit, and cooling unit [4]. Depending on weather conditions of each kind of weather data, elements of each unit become designed. The components of basic cycle were consisted of solid desiccant wheel as dehumidifier, evaporative cooler as cooling unit, heat recovery wheel as per-heater and per-cooler in regeneration and process air side, respectively. In recent years, according to Pennington cycle, the different types of solid desiccant cooling cycles were designed by various researchers on the world. COP of desiccant cooling systems, regeneration temperature, mass flow rate, fresh air, relative humidity of supply air are the important parameters which were considered by researchers. Jain et al. [5] evaluated ventilation, and recirculation cycles based on India weather data, to find effect of the effectiveness of evaporative coolers on COP of cooling system. Haddad, K et al [6] have studied about simulation of a desiccant-evaporative cooling system for residential buildings. They found that the use of solar energy for regeneration of the desiccant wheel can provide a significant portion of the auxiliary thermal energy needed. Fong et al.[7] have designed a simulation model (TRNSYS) of an integrated radiant cooling by absorption refrigeration and desiccant dehumidification. Dezfouli M.M.S. et.al [8] investigated solar hybrid desiccant cooling System in Hot and Humid Weather of Malaysia. They found that solar hybrid solid desiccant cooling system provided considerable energy savings in comparison with conventional vapor compression in hot and humid area. Latest Trends in Renewable Energy and Environmental Informatics ISBN: 978-1-61804-175-3 89
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Comparison Simulation between Ventilation and ... air become cold by evaporative cooler and then air goes to room as supply air. ( ) Figure 3: schematic of solar desiccant cooling
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Comparison Simulation between Ventilation and Recirculation of Solar Desiccant
Cooling System by TRNSYS in Hot and Humid Area
MMS DEZFOULI, SOHIF MAT, K.SOPIAN
Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia