Development of New High-Side Shell Scroll Compressor with Real-Time Oil Level Sensor

摘要

Recently Building Multi System Air-Conditioners (VRF: Variable Refrigerant Flow) are continuously wideningrntheir market share in the global air conditioning marketplace, as commercial buildings are required to reducernbuilding energy consumption due to global warming issue.rnIn building multi system air-conditioner (VRF), because of the long distance or high elevation gap between outdoorrnunit and indoor unit and the wide variable speed range with various cooling and heating loads, the oil in therncompressor sump can be dropped below minimum level before the discharged oil returns to compressor. In order tornimprove the compressor reliability, it is desirable to develop the technology for sensing and controlling oil level ofrncompressor in real time.rnThis paper introduces the principle of real-time oil level sensor and its application to control oil level of scrollrncompressor.