摘要：AbstractModern manufacturing industry needs to produce a precision product, minimal defects and also low maintenance so the production costs could be reduce as minimum as possible. Also to meets with environment and international standard, the efficient machinery tools needed to fulfill the standard requirement. On conventional oil chiller with On/Off system was not able to meet industrial needs, because it is bad accurate and low energy efficiency. Variable speed mode (VSM) replaced conventional ON/OFF system. VSM is a mode using an inverter to get high accuracy in keeping oil temperature steady out of the target. An accurate oil temperature control system within a very restricted range could be achieved by VSM system. In order to get low deviation from the targeted temperature, the oil cooling system with VSM need controlled by an inverter-driven refrigerator which has been applied to a new theory to control the oil temperature.This paper presents an experiment research to control the oil temperature constant at target point, in this experiment is 35 ¡C by using an inverter attached in compressor to varying the compressor speed. This control has been completed and tested through an experiment with different heat load of 4kW, 6kW, 7kW, 8kW and 10kW given under temperature constant room conditioned as 25¡C. The results had shown that the temperature deviation in the refrigerator has around 0.2¡C and gain 20% of energy saving.
