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Apexx™ VSH: variable speed scroll for air conditioning EnVisioneering how to bring high-capacity variable speed scroll compressors to air conditioning and heat pump manufacturers As an example of EnVisioneering at work, Danfoss is helping commercial air conditioning manufacturers meet today’s demands for increased energy efficiency, as well as reduced system noise, increased system reliability, and improved end-user comfort, all at a minimum initial system cost. The solution is Danfoss VSH series compressors—the first high-capacity R-410A variable speed scroll compressors for air conditioning and heat pumps. This design is the result of decades of Danfoss expertise in high-performance compressors and variable frequency drives. Three VSH packages cover a 90 Hz design capacity range from 11 to 23 TR (R-410A). Delivered capacity is from 3.5 to 23 TR, depending on load. |
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Energy Efficiency
Compared to conventional systems, energy savings with a VSH compressor can exceed 20%. That’s because traditional commercial air conditioning systems are designed for efficient operation at peak load conditions, so systems are actually oversized about 85% of the time or more. Consequently at partial load conditions, the systems deliver excess capacity, with significant and costly energy waste. In contrast, the VSH compressor is designed to maintain high isentropic efficiency at part load and has the inherent benefit of precisely and continuously matching the load with capacity output ranging from 30 Hz to 90 Hz. With no excess evaporator and condenser capacity under part load, VSH system COP is higher, leading to significant energy savings. Continuous operation also means less cycling and system stress, higher reliability, and longer lifetime. Variable speed operation means lower sound levels, too. At night, when loads are typically lowest and a VSH compressor cycles, it does so at its lowest (and quietest) speed. 
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| Innovations for Competitive Advantages
While responding to energy and application issues, a VSH compressor enables designers to create more compact designs, because a VSH compressor is physically smaller than a fixed-speed compressor of similar capacity. And designers can take advantage of new opportunities: eliminating hot gas bypass piping, avoiding manifolds, and reducing circuits. Manufacturers can also create control strategies to differentiate their systems in the marketplace, as tight temperature control is easy and cost efficient. Plus with a VSH compressor, it makes sense from both efficiency and noise control standpoints to apply variable speed condenser fans, air blowers, and chiller pumps. To see additional information about VSH variable speed drive scroll compressors, click here (PDF - 921K). |
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