The new dedicated scroll compressor drives (OJ DC series) allow chillers and AHUs to use more effective motor technologies while providing the means to adjust the compressor capacity continuously.
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The OJ Drives allow fans in ventilation and compressors in chillers and AHUs to be operated at different speeds, which results in significant energy savings. A dedicated drive for scroll compressors allows compressors to operate at variable speeds, reducing power consumption in cooling and heating applications compared to fixed-speed motors.
Perfect for chillers and AHUs, the new series of dedicated drives is key to keeping the compressor’s optimum working condition while securing performance and efficiency.
The OJ DC series has the ability to adjust the speed of the motor to meet the capacity demands. When the need is low, the drive will run at a reduced speed, requiring less energy. The new solution presents a variable speed drive (VSD) that controls the frequency supplied to the motor in the compressor in response to real-time demand on the system.
The new drives optimise motor speeds and compressor performance, reducing stress on mechanical and electrical components, prolonging your system’s life and minimising downtime. The OJ DC series warrants optimal performance for permanent magnet brushless motors, especially during start-up and part-load operation. The oil handling function ensures compressor lubrication with precise oil management.
The dedicated drives for compressor systems comprise five power variants (from 4 to 15kW). The new DC series is built on proven OJ technology used in the existing DV series. Both DV and DC series result from combining EC (electronic commutation) and FC (frequency converter) technologies.
The dedicated scroll compressor drives carry considerable advantages for applications where efficiency, durability, and reliability are essential: significantly lower energy consumption and operation costs.
Choosing between a central or decentralised solution depends on the building’s purpose and cooling and heating requirements. Still, decentralised systems are gaining popularity among building owners and facility managers, as they are cheaper, easier, and faster to install. They can better meet the demands of different tenants in different parts of the building throughout the day and night and produce much less noise. At the same time, buildings with overly large central AHU systems and large single-compressor chillers typically perform poorly during off-hours and part-load conditions.
The new OJ DC series fits perfectly in decentralised systems as they perform better under varied conditions. The dedicated scroll compressor drives work perfectly in a modular and flexible solution offering more possibilities when configuring the system. The DC series reduces cable length, especially the expensive ones.
Durability has been an essential keyword throughout the R&D phases, rendering DC ideal for central and decentralised locations where environments get rough. The OJ DC series has been tested for continuous and unaffected performance. It continuously works in almost any setting from -40°C to +50°C / -40°F to +122°F and has high scores from the IP and NEMA protection class, respectively, IP54/IP65 and NEMA 4X. These ratings are more than sufficient in most situations.
By adjusting compressor speed to match the cooling load of the building, the DC series ensures higher efficiency and comfort levels.
The OJ DC series enables that the motor only delivers enough energy to power the compressor and no more, eliminating energy waste. The OJ DC secures efficiency of up to 97%. Analyses have shown that a 20% reduction in motor speed can lead to a 20% energy saving (source: GAMBICA).
A dedicated drive for scroll compressors in your chiller or AHU system is more efficient, uses less energy, and assures optimal lubrication control and flawless performance regardless of variable loads or capacity.
The OJ DC series has pre-configurable settings that help maximise productivity. The removable front cover facilitates easy access to connectors for instant system configuration. The drive unit can be mounted with the scroll compressor at the factory to be tested before installation.
OJ compressor drives offer a large user-friendly connection area, holding both Modbus RTU and BACnet MS/TP protocols and a 0-10 V communication control. BACnet ensures that information is standardised and exchanged between a building’s sensors, actuators, and controls. Equipped with BACnet MS/TP, the OJ DC can now be part of the building automation. BACnet MS/TP is running on RS-485.
“The dedicated scroll compressor drives carry considerable advantages for applications where efficiency, durability, and reliability are essential: significantly lower energy consumption and operation costs.”
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Lasse Larsen, Product Manager Compressor Drives at OJ Electronics
As the OJ DC series comes with a fully integrated EMC filter, it meets emissions and immunity norms in industrial and residential areas EN -3 (C1 and C2). The OJ DC product series is cULus recognised according to UL -5-1 and CS22.2.174.
To understand the different types and technologies of compressors, we first need to understand the two basic principles of compressing air. These are dynamic and displacement compression. In this article, we talk about the scroll compressor. This is a type of displacement compressor with wide applications in air-conditioning and refrigeration systems, heat pumps, and cars.
Scroll compressors consist of two spiral-shaped scroll elements that are bolted together: a stationary scroll and an orbiting scroll driven by a motor. The process of compressing air in a scroll compressor involves several steps:
By following these steps, scroll compressors achieve efficient and reliable air compression.
When most people think of air compressors, they probably imagine a bulky and loud machine. Scroll compressors are pretty much the opposite of that. They are oil-free, compact and relatively silent compared to other types of compressors.
Thanks to the simple design of the scroll compressor with only one moving part, this type of compressor is highly reliable and quieter compared to the piston and rotary screw compressor. This makes them perfect for sensitive working environments, like a dentist’s office. Another advantage of scroll compressors is energy efficiency.
Similar to internal compression in a screw compressor, the amount of internal compression is determined by the discharge port. Due to the unique design of the discharge port, the scroll air compressor can compress more air or gas while using minimal power.
Compared to other compressors, these machines attain the highest efficiency level by volume. This is because there are no pistons to compress the gas.
The noise emission of a scroll air compressor is significantly lower than other compressors. The complete compression cycle takes 2.5 turns, including the suction, compression, and discharge revolution phases. These occur simultaneously while providing a constant flow of pulsation-free air.
The scroll air compressor offers smooth and vibration-free operations thanks to its scroll element. It hardly has any torque variation compared to a piston compressor. The simple design of the scroll air compressor contains only one moving part. This makes it highly reliable and quieter than equivalent piston and rotary screw compressors.
Scroll compressors are widely used in various industrial applications due to their efficiency and reliability. They meet the basic requirements of a general-purpose compressor and are commonly used in the food, refrigeration, air-conditioning, and transportation industries. For larger volume demands, oil-injected screw compressors may be more efficient.
There is an abundance of applications for quiet and energy-efficient compressors that produce absolutely clean air. Take the SF scroll compressor series from Atlas Copco, which has been a leader in this field for more than 60 years. Its unique characteristics make it ideal for many manufacturing processes for which clean, oil-free compressed air is a prerequisite. That is why the SF is the preferred choice for sensitive indoor environments, like hospitals but also labs, breweries, bakeries, dairy farms, electronics manufacturing, and even lens production.
The SF series features a capacity range of 1.9 to 7.6 l/s (4.03 to 16.10 cfm), a maximum working pressure of 10 bar (145 psi), and a dew point performance as low as 2°C/36°F. Its air-cooled scroll element ensures efficiency, reliability, and durability, while the premium efficiency IE3 class motor lowers energy consumption. Most importantly, the SF series produces absolutely clean air.
We hope this guide provides a good overview of whether or not a scroll compressor makes sense for your needs. If you'd like more information, feel free to get in touch. Our team is happy to point you in the right direction.
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