Research — Datacenter · Precomputed (draft, unvalidated)
Liquid loop: lose a CDU
A rack row fed by a bank of coolant distribution units, each through its own trunk leg to supply and return manifolds, drawn in plan and in isometric. Play six stories, or switch to free play, pick a row from exported options and click any CDU to fail it: that unit goes dark, the survivors pick up its flow, every leg’s velocity gauge shifts, the capacity margin can go negative, and the harness’s remediation (a larger leg, or parallel runs) animates in with the re-read result.
Story
Free play · build a row, then click a CDU to fail it
Representative rows · the ones unit-by-unit failure data exists for
Racks in the row
kW per rack · illustrative
CDUs · duty + spare
Capacity per CDU · illustrative placeholder
Trunk leg diameter · nominal
Every control snaps to a value the harness was run at; the page reads that cell and never estimates between two. Rack and CDU sizes are round illustrative placeholders, not equipment data.
Liquid loop · plan view of one rack row
Velocity is checked per CDU leg (the trunk pipe between a CDU and the manifold), not on the manifold; the manifold arrows are schematic. Gauges run on a plain 0 to 5 m/s drawn axis. L/m is litres per minute. Supply 30 C, return 40 C and all kW are illustrative placeholders.
Or fail a unit from here
The same row · isometric
Leg diameter ladder · after losing one unit
The same row at each exported leg size, read from the grid (circles drawn to scale). Click a size to try it in free play.
Every check at this state · the controlling row is highlighted
Rule column: the citation the data file gives for each check. The velocity limits are ASHRAE guidance reached through secondary sources only. The harness is a v0.1 draft, unreviewed.
How the checks read it
Every check · before the loss, after the loss, after the fix
Required values are read from the data file. The table fills in as the story reaches each step. Tight is a display band at 80 % of the cited limit, not a standard. 'No cited limit' means not applicable, never a pass.
aggregate_rack_heat_load, check_cooling_capacity_margin, evaluate_liquid_cooling_heat_dissipation, evaluate_pipe_velocity_for_flow_rate, propose_pipe_diameter_remediation, propose_parallel_pipe_remediation.Not modeled: pump curves or flow-dependent capacity, pressure drop and the manifold itself (velocity is checked on each CDU leg only), reverse-return balancing, an idle spare (every installed unit runs), temperature changes in the water properties, the facility-water side, and any real site layout. The drawing is schematic and its geometry is illustrative.See also:Liquid loop, hands-off walkthrough · Generation to rack: power path N-1 · Cooling capacity margin · Pipe velocity regimes