Inverter compressors continuously keep changing speed to match the load, which makes the oil management of the system more complex compared to traditional technology.The strong experience in mechanical must be complemented with electrical engineering skills as well as controller development and programming. Competence level and experience engineering OEM in implementing inverter technology.OEM manufacturer skills in inverter system integration: not all OEMs are yet prepared to adopt inverter technology due to following reasons: The drive ensures that the compressor is optimally lubricated at all compressor speeds. As the compressor rotational speed changes, the amount of refrigerant - and oil - flowing through the compressor increases or decreases. The drive can also manage other devices such as oil injection valves or multiple compressors. ![]() ![]() They ensure that the system will run within the application constraints. The inverter frequency drives need to use algorithms developed specifically for heating, ventilation and air conditioning (HVAC) or for refrigeration. The drive modulates the compressor speed and prevents it from operating out of the compressor operating limits. Importance of the inverter drive: The compressor and drive need to be qualified to work together and for dedicated applications. This graph represents typical annual climate data and hours of run time (% of year) for each condition.Ĭompressor and drive selection, designer skills makes the system overall reliability and efficiency. These conditions are not those conditions in which the equipment will operate most of the time. HVAC systems are designed for peak conditions (right side of the graph). Only a few percentages of operations are at full load in a building. Average consumption index based on simulations for 10-30TR compressors used in applications with low pressure ratio (rooftop) Index 100 = Danfoss inverter scroll VZH energy consumption. Higher reliability and continuous runningĮnergy consumption for cooling systems using different compressor configurations.Reduced number of components in the system.This adds to the long list of benefits to manufacturers, consulting engineers and end-users in terms of: On top of the standard benefits for all inverter compressors and technology, Danfoss Commercial Compressors has prequalified inverter compressors and drives designed to work together. Less noise than with conventional on-off systems during partial load operation.Better humidity control makes the unit suitable even for spa installations thanks to adjust the capacity of the unit and thus better control of the evaporating temperature.Low in-rush current also helps in saving fixed costs charged by utilities (peak current calculation) and reduces mains and power backup loads.Īdditional benefits are of inverter compressors are: It prevents high mechanical stress on the machine, and generates lower service costs and decreased wear. Most inverter scroll compressors are soft starting which avoid torque surges.Traditional fixed-speed compressor in a system can make 8-12 start/stop cycles and every start will draw high current from the supply, which leads to high power consumption and stress on supply, and on compressor mechanical parts. Direct-on-line (DOL) compressor start draws 5-6 times the nominal current until the compressor running speed is attained. ![]() The soft start control leads to a near zero inrush current and improves EER: The capacity modulation attenuates power demand peaks which also contribute to increasing the grid reliability and quality of power supplied. All in all, this means energy efficiency in buildings. The stable temperature control secures the processes in an optimum way and provides greater comfort. The unit copes effectively with changes in temperature and runs at partial load which can represent over 30% reduction in the energy bill every year compared to a fixed speed or mechanically modulated compressor. The compressor matches power input with cooling capacity. ![]() Inverter compressor technology offers new opportunities for air conditioning systems, first of all in terms of energy efficient buildings, reduced energy consumption and lower running costs.Īdditionally, the technology improves power factor leading to better power supply quality as well as better system diagnostics and open communication protocols which facilitate servicing.Ĭontinuous adaptation to cooling demand provides higher energy savings and accurate temperature control. Better power supply quality, system diagnostics, humidity control, energy savings, accurate temperature control, less noise, process safety, greater comfort.
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