PENGARUH TEMPERATUR PREHEATING FEED WATER TERHADAP UNJUK KERJA UNIT DESALINASI BERBASIS POMPA KALOR DENGAN MENGGUNAKAN PROSES HUMIDIFIKASI DAN DEHUMIDIFIKASIud

摘要

Desalination unit based on heat pump with humidification anduddehumidification processes is one of the applications of heat pump system, withudaddition of a humidifier, sprinkler and evaporator (as dehumidifier) that integratedudin a duct. The air has humidified in the humidifier with the spray of seawaterudthrough the sprinkler and then it has cooled in the evaporator to produce freshudwater. The addition of electric water heater has used to vary the seawaterudtemperature to the humidifier on this system. In this research has examined theudeffect of preheating seawater temperature on the performance of desalination unitudbased on heat pump system with using humidification and dehumidificationudprocesses. In this research the seawater/feed water temperature has varied at 28oC,ud30oC, 45oC and 60oC, air temperature has conditioned at a constant temperature ofud30oC, and ambient temperature has kept constant at 28oC. Compressor hasudoperated at a constant rotation of 1,200 rpm, the seawater volumetric flow rate hasudkept at 300 l/h, and seawater in this system has recirculated. The result of thisudresearch showed that the volume of fresh water production increase withudincreasing the inlet of the seawater/feed water temperature to the humidifier onudthis desalination unit.ududKeywords : desalination, heat pump, preheating, humidification, dehumidificationud