❄️ Thermosyphon CDUs (Nokia / Calyos Gravity Thermosyphon CDU, 400 kW Zero-Pump Rejection)

Two-Phase Evaporative Thermosyphon CDU Calculator

Size closed-loop gravity-assisted two-phase thermosyphon cooling systems (Nokia Bell Labs / Calyos): use latent heat of vaporization of dielectric refrigerants (Novec / R1233zd) to reject $400 ext{ kW}$ server rack heat with zero mechanical liquid pumps, achieving PUE $<1.03$, and hyperscale data center profits.

1. Project & Operating Inputs

Server Cluster Heat Duty (kW e.g. 380 kW AI GPU Cluster)

Evaporator Evaporation Saturation Temp (°C e.g. 45.0°C Boiling Temp)

Customer Bid Price for Supplied Thermosyphon System ($)

Microchannel Evaporator Plates, Vacuum Tight Header, Overhead Condenser ($)

2. Financial Breakdown & Yield

PUMP-LESS TWO-PHASE THERMOSYPHON

Turnkey Zero-Pump Thermosyphon Rack Skid Profit

Passive Mission Critical Cooling Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Direct Cost