The compressor noise problem is normal and within their spec. This could be the main reason as the clunking noise found when the compressor is in switching states. Different capacities demonstrate the pressure differences between the high-pressure and the low-pressure sides of the modulation chamber. Hermetic digital scroll compressor has been widely used as a small-scale organic Rankine cycle application in the heating, ventilation, and air conditioning systems. emersonclimate.eu Uni qu ement compresseur Cop ela nd Digital Sc rol l: al ar me température de refoulement anormalement élevée - arrêt du compresseur . Create a link to share a read only version of this article with your colleagues and friends. The FFT comparison shown in Figure 12 indicates that, by using the discharge valve, a pre-pressure in the modulation chamber before the closing of the main valve is helpful to the noise reduction. This could be the main reason as the clunking noise found when the compressor is in switching states. Universal HVAC Compressor Sound Cover. I have read and accept the terms and conditions, View permissions information for this article. The new rattle noise/vibration was found at higher frequency range and caused outside the compressor, which will be discussed in this paper. The use of a discharge valve was found useful for noise reduction. Different capacities demonstrate the pressure differences between the high-pressure and the low-pressure sides of the modulation chamber. There is a slight increase on the knocking sound level from the loaded status switching to the unloaded status. Both units have Copeland scroll compressor. Noise performances of the discharge valve: (a) baseline; (b) 0.1 s pre-open and 0.5 s post-close; (c) 0.1 s pre-open and 0.2 s post-close; and (d) opposite operation. View or download all the content the society has access to. How does it work? With over 26 million scrolls installed, and thousands in refrigeration applications, Copeland understands your need for reliability. Firstly, due to the nature of a hermetic compressor, it cannot be opened to repair or modify its inside structure. A manual digital control system, independently from the original operating system, is programmed by using the LabVIEW.13 The new control system can directly control the open/close state up to three different valves. Zpd72kce-tfd-433 Copeland Digital Scroll Compressor For Air Conditioner , Find Complete Details about Zpd72kce-tfd-433 Copeland Digital Scroll Compressor For Air Conditioner,Scroll Compressor,Digital Scroll Compressor,Copeland Digital Scroll Compressor from Refrigeration & Heat Exchange Parts Supplier or Manufacturer-Dongguan Mei Tuo Electrical And Refrigeration Equipment Co., Limited It is commonly used in fridges and freezers to pump around the freon. The semi-active control methods are thus designed to greatly reduce the noise level by using additional valves to adjust the pressure changing rate within the modulation chamber. I've had probably 4 different companies look at it over the last few years, and everyone is telling me the same thing - that this is just what scroll compressors do as they try to push the refrigerant back up to my … The new rattle noise/vibration was found at higher frequency range and caused outside the compressor, which will be discussed in this paper. As a small-scale organic Rankine cycle application, hermetic digital scroll compressor has been widely used in the air conditioning due to its advantages of reliability, efficiency, and low cost compared to the inverter type compressor.1–3 However, several models of the digital scroll compressors used in an air conditioning outdoor unit may generate unacceptable levels of clunking noises during operations. The discharge valve is used to increase the pressure changing rate and shorten the impact response time. The use of a discharge valve is also tested for controlling the pressure changing rate inside the chamber. There also exist some differences in the middle frequency (700 Hz) and high frequency (1200–1600 Hz) ranges. There is a slight increase on the knocking sound level from the loaded status switching to the unloaded status. United States patent US 6,601,397 B2. The test rig is shown in Figure 5. One microphone is placed 0.5 m high and 0.5 m away from the compressor. The compressor is then in a loaded status. Kaishan offer multiple models of rotary screw compressors: KRSB– Belt drive compressor ranging from 5 HP to 50 HP. Vibration spectrums and their FFT comparisons using C204 on the operating system: (a) baseline and (b) C204 released. 00. Thus, the contact speed of the scrolls and the noise issue can be controlled. It is noticed that the noise level from the compressor when changing from the unloaded to loaded status is much higher than that when changing from the loaded to unloaded status. If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. For the C301 (0.2 s per-release with a 4 times/s multi-open/close) controlling method, a variation of the pressure is found before the main valve is opened and the maximum pressure change is also reduced. FundingThe author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by Australian Government Department of Industry, Innovation and Science through its Innovation Connection scheme. For more information view the SAGE Journals Article Sharing page. Jul 8, 2020 - High quality Big Size Programmable Constant Temperature Humidity Chamber Low Noise Scroll Compressor from China, China's leading temperature and humidity chamber product, with strict quality control environmental simulation chambers factories, producing high quality environmental simulation chambers products. Then the effects of two types of additional valves are examined in an operating system. Way more noticeable than the older piston units. Due to the high pressure difference between the low-pressure suction chamber and the high-pressure modulation chamber, the pressure differential force overcomes the spring force and then the up-scroll is pushed downwards and coincides with the low-scroll. A manual digital control system, independently from the original operating system, is programmed by using the LabVIEW.13 The new control system can directly control the open/close state up to three different valves. The reason could be a higher pressure level inside the modulation chamber while adding a discharge valve. In the system identification test, a compressed air cylinder is used to provide a constant high-pressure gas directly into the high-pressure chamber. During this time the membe rs are separated. The higher pressure level inside the modulation chamber could lead to the larger pressure differential between the modulation chamber and the suction port at the time when switching from load to unload status. The noise performances are shown in Figure 11. Pham, HM, Vogh, RP III and Jayanth, N. Digital scroll condensing unit controller. FundingThe author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by Australian Government Department of Industry, Innovation and Science through its Innovation Connection scheme. 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