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This paper presents a theoretical analysis of thermal storage unit using  phase change material (PCM) as storage medium. Storage unit consists of  parallel rectangular channels for the air flow which are separated by phase  change storage material. The purpose of storage unit is to absorb the night  coolness and to provide cooled air at comfort temperature during day time in  summer season. MATLsimulation tool has been used to compute the air  temperature variation with location as well as time, charging and discharging  time of storage unit. Phase change material used for analysis is selected in  such a way that it’s Melting point lies between comfort temperature and  minimum night ambient temperatures. The air flow rate needed for charging of  PCM is approximately four times greater than the flow rate required during  day time to achieve comfort temperature for approximately eight hours, due to  limited summer night time (only eight hours). The length of storage unit for  which NTU value is greater than or equal to five will give the exit air  temperature equal to PCM temperature for the case of latent heat utilization.  It is found that artificial roughness on the duct surface effectively reduces  the length of storage unit in the cost of some extra pressure drop across the  duct

Effect of roughness geometry on heat transfer and friction characteristics of PCM storage unit for night coolness storage in summer season