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"Sistem tata udara mengonsumsi sebagian besar energi listrik pada gedung. Oleh karena itu, diperlukan upaya untuk meningkatkan efisiensi sistem tata udara untuk menghemat penggunaan energi. Salah satu komponen sistem tata udara yang mengonsumsi listrik besar adalah motor induksi pada pompa. Penggunaan pompa sistem katup untuk mengontrol debit aliran air tidaklah efisien. Namun, hal ini dapat dihindari dengan memanfaatkan Variable Speed Drive (“VSD”) yang dapat mengendalikan debit aliran dengan prinsip pengendalian kecepatan putar motor melalui perubahan frekuensi input. Penelitian ini melakukan analisis terhadap penggunaan konsumsi energi listrik pada sistem tata udara gedung beserta perbandingannya saat sebelum dan sesudah penerapan VSD untuk mengetahui besarnya penghematan energi.......Air conditioning system consumes most of the electrical energy in buildings. Therefore, further efforts are required to improve the efficiency of an air conditioning system to save electricity. One of the components of an air conditioning system that consumes a large amount of electricity is the induction motor on the pump. The use of a valve system pump to control the flow of water is inefficient. However, this can be avoided by utilizing a Variable Speed Drive (“VSD”) to control the flow rate which controls the rotational speed of the motor by changing the input frequency. This study aims to analyze the use of electrical energy consumption of an air conditioning system and its comparison before and after the application of VSD to determine the amount of energy savings."

"ABSTRAKIn order to maintain issued of environmental safe and clean, Indonesian government has been tried very hard to reduce toxicity, especially in water cooling systems by prohibiting chromate to be used.A part from inhibitor chromate, the industries still use some inhibitors such as zinc phosphate, polyphosphonat etc, but the dangers of these inhibitors still unsolved. To anticipated of this condition, in this time has been made an advances of development of unpoisonous inhibitor called Ascorbic Acid (vitamin C).The investigation started with behaviour of Ascorbic Acid in near neutral aqueous solution regarding corrosion of stainless steel. The experiment result indicated that inhibition of Ascorbic Acid gave effectiveness of 75 - 83 %. with intervals of 60 - 100 ppm. This effectiveness values can be said that Ascorbic Acid very promising to be used for inhibitor corrosion. Furthermore research must take place to get more information about inhibition of Ascorbic Acid, so that Ascorbic Acid can be used commercially in industries."