by Brianna Crandall — August 14, 2019 — Global technology provider Danfoss has boosted the part-load performance and the operating map of its leading VZH variable-speed scroll compressor range.
The third-generation commercial inverter scrolls retain the strengths of the previous version, with the addition of the Intermediate Discharge Valve (IDV) technology for enhanced seasonal efficiency, and a wider operating map. The products are particularly suitable for comfort reversible applications and computer room air-conditioning (CRAC) units.
The 3rd-generation VZH variable-speed scroll compressors add Intermediate Discharge Valve technology for enhanced seasonal efficiency, and a wider operating map. Image courtesy Danfoss. Click to enlarge.
Matthieu Stoll, global marketing director A/C, Danfoss Cooling, explained:
The introduction of IDVs in the large models means that there’s no longer a need for high- and low-pressure compressor optimization — potentially halving inventory management requirements. And the wider operating map brings huge value for strategic applications. We can accelerate the changeover from older Danfoss inverter scrolls to the third generation seamlessly.
Features and benefits of the new generation variable-speed scrolls include:
- Prequalified Danfoss compressor and drive package for time to market and reliability
- Accurate temperature control and humidity management for high energy efficiency and comfort
- Low start-up current, and manageable acoustic level with variable speed technology
- A complete line-up of models from 4 to 26 TR (up to 52 TR in hybrid tandems), all with IDV technology for superior part-load efficiency
- Wider operating map to cover more types of applications
- Smaller OEM inventory on larger models with the transition from two high-, low-pressure ratio to a single IDV model
Looking to the near future, multi-refrigerant capability is in the pipeline for the VZH range, including R452B and R454B, and a version derived from VZH will also be released for R32, says Danfoss. This will enable original equipment manufacturers (OEMs) to respond to future challenges in the refrigerant landscape while addressing energy efficiency regulations.
VZH compressor and ETS Colibri electronic expansion valves: innovative solutions for IT cooling
Precise close-control air-conditioning systems are crucial for areas where cooling is business-critical, such as data centers, mobile phone network exchanges, and server rooms, points out Danfoss. The company’s VZH compressor and ETS Colibri electronic expansion valve offer an affordable solution to deliver the precision needed. The ETS Colibri electronic stepper motor valve with direct-driven bipolar motor delivers precise liquid injection into evaporators. The unique in-line design includes a balanced cage and slider assembly to ensure tight shut-off flow in both directions, providing optimal system operation.
Danfoss says its inverter scroll compressor VZH offers effectiveness and reliability. Over 30% energy savings is possible in rooftops, chillers, close controls, etc.
For more information about the VZH inverter scroll compressor range, visit the Danfoss website. The company also offers information on variable-speed technology for efficient commercial air-conditioning and precision cooling, including system descriptions, cases and training.
