Door Heat Exchanger: Specification

1. Door Heat Exchanger: Specification John Fernandes Facebook

2. Potential applications: Naming convention Air-assisted (liquid-to-air) Hybrid (air-to-liquid & liquid-to-liquid) Traditional (air-to-liquid)

3. Physical specifications

4. Physical specifications • Hinged solution for ease-of-access: Fans, power-bus bar, manifolds, etc. • Weight limitations • Assembled and primed rack: ≤ 3086lbs (1400kg) • Door HX only: 220lbs (100kg) preferred; 330lbs (150kg) maximum • Minimum aisle width of 4ft (1220mm) • Permit opening of door by at least 90° without interfering with adjacent racks

5. Physical specifications

6. Physical interfaces • Facility coolant • Connections should be permitted from both top and/or bottom sides • Accommodate different interface types for flexibility on-site; QC-type? • Electrical (active variant) • Supply options: 110 or 230VAC (50/60Hz) • AC plug-in connector: C14 or C20 • DC supply from open rack power-bus bar (11 to 54VDC)? • Fuse specification? Preferred location? • Communication • Port type and protocol? Preferred location?

7. Facility air-side conditions * or dependent on IT gear being supported; 12.2°C may serve as a reference value to define performance metrics under 100% neutralization of heat load

8. Facility coolant requirements • Operating pressure: Typical range? worst-case? • Supply temperature: ≥12°C (non-condensing); typical range? • Coolant DT across door: Typical range? Target for efficient operation? • Supported coolant types: Water, water + glycol, dielectric • Pressure drop requirements?

9. Performance / Metrology • Cooling or heat rejection capacity should be defined in kilowatts (kW) • Based on: Air and coolant flow rates, inlet temperatures to HX and operation at sea-level • Performance curves (or tables) should be provided for both normal and fan failure operation • Active variant • N+1 rotor/fan redundancy is a must • Total power consumption should be ≤ 2% of rated cooling capacity (not including fan failure) • De-rating factors for cooling capacity based on coolant selection (with respect to water) and altitude (with respect to sea-level) • Air- and coolant-side pressure drop curves should be provided

10. Monitoring & Control • Which of the following could be classified as required, recommended or optional? • Monitoring • Door inlet and outlet temperatures, differential pressures (air and coolant) • Fan duty cycle or speeds • Modulating coolant control valve (position), coolant flow rate • Absorbed power, total power consumption • Alarms • Fan high/low speed, fan failure • Sensor failure, communication failure • Leak detection • Control • Air outlet temperature, water outlet temperature • Differential water temperature, differential air temperature • Reporting should employ the REDFISH standard

11. Serviceability • Ease of replacing Door HX • Draining, un-mounting, installation and priming • Access to physical interfaces (coolant connections, power supply and communication cables) • Containment and discharge of expelled coolant in the event of a leak? • Discharge from condensation pan at the bottom of Door HX assembly? • Ease of replacing fan modules • Ease of replacing sensors or other accessible parts

12. Quality & Testing • Testing of HX after assembly • Pressure rating: Reference condition, factor-of-safety? • Leak testing • Checking physical interfaces? • Quality • Soldered joints only? • Sealing on adapter frame and/or HX to prevent leakage of server exhaust or entrainment of facility air? • Any other requirements that should be standard?

13. Regulations, Compliance, etc. • Regulations/compliance • What are standard requirements? • Labels and markings? • Vibration & shock