Whitepaper Rittal Liquid Cooling Packages
Rittal
Rittal's Liquid Cooling Package (LCP) family offers close-coupled air/water and DX coolers as an alternative to room CRAC cooling once rack loads exceed a few kW. For each variant the paper gives capacity, footprint and the allowable air delta-T.
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Overview
The paper says conventional room cooling with circulating air is typical below 5 kW per rack, and that containment or close-coupled cooling is used above that or for hot spots. The row (Inline) variant cools a contained aisle, while the rack variant cools a sealed rack with a side cooler. Units come in 30 kW and 55 kW classes, are 300 mm wide, and the 55 kW Inline occupies about 0.36 m2.
Use limits are explicit. LCP Inline is typical up to about 15 kW per rack with air delta-T not above 15 K; LCP Rack reaches 55 kW per rack with delta-T up to 20 K (blade servers up to 25 K). LCP hybrid doors fit 600/800 mm wide, 2000/2200 mm high racks in 10 kW and 20 kW versions and open 130 degrees.
The refrigerant-based LCP DX (R410a) removes up to 12 kW on 0.35 m2, modulates between 3 and 12 kW and works over an outdoor range of -20 to +45 C; output falls to 10 kW at 42 C ambient and average EER is about 3.5. Running more fans at lower speed can cut LCP electrical consumption by up to 40 %.
The last section quantifies energy gains: raising chilled water from 12 C to 16 C (free-cooling threshold from 9 C to 13 C) can save up to 21 % of operating cost for a 100 kW installation. This is a 2017 manufacturer publication, so capacities are tied to Rittal products.
Key points
- Room cooling with circulating air is typical below 5 kW per rack; above that, containment or close-coupled cooling is used.
- LCP Inline/Rack come in 30 kW and 55 kW classes at 300 mm width; the 55 kW Inline takes about 0.36 m2.
- LCP Inline: up to about 15 kW per rack, air delta-T at most 15 K; LCP Rack: up to 55 kW per rack, 20 K (blade servers 25 K).
- More fans at lower speed can cut LCP electrical consumption by up to 40 %.
- Hybrid doors come in 10 kW and 20 kW versions and open 130 degrees.
- LCP DX (R410a): up to 12 kW, 3-12 kW modulation, -20 to +45 C, 10 kW at 42 C, average EER about 3.5.
- Raising chilled water from 12 C to 16 C can save up to 21 % of operating cost at 100 kW.
Using it in design
- Catalogue close-coupled coolers by type (inline row, closed-loop rack, rear door, DX rack), rated kW, width, footprint, maximum air delta-T and water/refrigerant inlet temperatures.
- Suggest containment or close-coupled cooling above 5 kW per rack.
- Warn when an inline cooler is assigned more than its capacity or when server delta-T exceeds the cooler limit (15 K inline, 20 K rack).
- Expose the chilled-water setpoint in the free-cooling calculator and recompute economiser hours.
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Who should read it
Designers choosing between close-coupled cooling and room CRAC units for high-density racks.
Related standards
- ASHRAE TC 9.9 Thermal Guidelines
Publication details
- Authors
- Rittal
- Publisher
- Rittal
- Year
- 2017
- Document number
- 5_1964
- Document language
- English
- Source type
- Manufacturer
- Access
- Free to read
- Licence
- Copyright retained; citation only — the publisher’s terms apply to the original document
Citation
Rittal (2017). Whitepaper Rittal Liquid Cooling Packages. Rittal. 5_1964. https://www.rittal.com/imf/none/5_1964/Rittal_Whitepaper_Rittal_Liquid_Cooling_Packages_5_1964/
Events on this subject
- ISK-SODEX Istanbul 2027
- SC26 – International Conference for High Performance Computing, Networking, Storage and Analysis
- ASHRAE Winter Conference
All content and rights belong to the respective authors and publishers. SoSo CAD provides only the citation, its own summary and a link to the source, and is not responsible for the sources' content.
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