Motivair ChilledDoor Rack Cooling System

Overview

The ChilledDoor mounts on the back of a standard rack, where EC fans pass server exhaust through a water coil and return air to the room at a set point. The brochure describes room-neutral operation without raised floor or CRAH, operation above dew point, and its control features. The door can be deployed on every rack or, by consultation, on every other rack.

Nominal capacity per rack by model is M4 12 kW, M8 30, M12 45, M12-F 55, M14 65, M14-6/M15/M15-E 70 and M16 75 kW. These are calculated at 75 F room, 35% RH, 55-65 F supply water and 100% water, with a flow range of 0-23 gpm. Fan power is up to 840 W on most models and 2.5-3 kW on M14, M14-6, M15 and M16, with 2-6 EC fans and 208/230 V single phase (277 V optional on some).

Physically, heights run 42U-60U (48U+ for the larger models), widths 600-800 mm and depth 13.3-17.5 in. Standard leak prevention and detection, a modulating two-way valve and a 100% failover mode are included. This is product data; it gives a starting point for checking rack heat load against door capacity.

Key points

1. Capacity per rack: M4 12 kW, M8 30, M12 45, M12-F 55, M14 65, M14-6/M15/M15-E 70, M16 75 kW.
2. Rating conditions: 75 F room, 35% RH, 55-65 F supply water, 100% water; flow 0-23 gpm.
3. Fan power up to 840 W (most models) or 2.5-3 kW (M14, M14-6, M15, M16); 2-6 EC fans; 208/230 V single phase.
4. Heights 42U-60U, widths 600-800 mm, depth 13.3-17.5 in.
5. Operates above dew point; leak detection, modulating two-way valve, 100% failover mode.
6. Deployable on every rack or every other rack (the latter by consultation).

Using it in design

• Add RDHx entries to the catalog with nominal kW at the stated water and room conditions, flow limit, fan power and rack size compatibility.
• Rack kW must not exceed door capacity at project water temperature; derate when supply water is warmer than the 55-65 F rating.
• Include door fan power in IT-adjacent load.
• Check that chilled-water supply is above room dew point.
• Offer a rear-door option in the rack cooling selector for 12-75 kW racks.

Who should read it

Mechanical designers considering rear-door cooling for 12-75 kW racks.

Related standards

• ASHRAE TC 9.9 Thermal Guidelines
• OCP
• Open19

Publication details

Authors

Motivair

Publisher

Motivair

Year

2023

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