Conventional DC Dashboard

A deterministic product contract for the facility alarm strip, power/cooling/environment/sustainability KPIs, contextual image, subsystem routes, basis drawers, generated design and FAQ in dc-conventional.html. The cockpit is a modeled teaching aid, not live BMS telemetry.

Engine CONV_CALC v2.0.0IT 30,000 kWFacility 43,500 kWMode SIMULATED / ADOPTED

01 Purpose & problem

A conventional facility overview must reconcile electrical demand, cooling duty, environment, resilience and alarm state before routing a user to subsystem pages. Static marketing callouts cannot provide that trust; every primary result needs a denominator, source class and repeatable calculation.

Operational outcome

Expose abnormal state first, then the minimum site-level values needed to decide which subsystem to inspect.

Engineering outcome

Keep PUE, facility/IT load, CHW, WUE, carbon and fuel arithmetic on one immutable scenario and surface placeholders honestly.

02 Users & personas

Persona	Goal	Primary read	Success condition
Facilities operator	Determine whether the site is normal and where to drill next.	Alarm strip → KPI strip → subsystem rail.	Can name alarm count, comms/quality, active capacity and next subsystem.
Electrical engineer	Reconcile protected IT, facility input and UPS sharing.	IT/Total/PUE, UPS A/B and EPMS route.	Can reproduce facility load and normal/failover UPS percentages.
Mechanical engineer	Check CHW temperatures, reference-flow scope, evaporator duty and tower rejection.	Cooling stats, Chiller Plant route and basis drawer.	Can reproduce 19.4/27.0°C, 7.6 K, the 943.0/982.3 L/s references, 31,250 kW evaporator duty and 36,403.4 kW tower rejection without calling either flow measured.
Sustainability analyst	Interpret PUE, WUE, grid factor and CUE denominators.	Efficiency panel and basis drawers.	Can distinguish 0.42 facility-kWh grid factor from 0.609 IT-kWh CUE.
Commissioning / design reviewer	Turn each value/control into a deterministic check.	BoD, generated design, FAQ, PRD/manual and engine snapshot.	No displayed fact lacks source class or known limitation.
Educator / learner	Understand the energy/water/fuel balance of a conventional DC.	Photo context, formulas, glossary and subsystem pages.	Can reproduce the worked scenario without treating it as site advice.

03 Scope & non-goals

In scope

Facility alarm/quality summary.
Site power, cooling, water, carbon, environment, safety, network and fuel overview.
Locked CONV_MODEL and derived CONV_CALC.snapshot.
Seven subsystem navigation routes, KPI basis drawers, shared Design Studio, FAQ and theme.
The adopted four-hall campus: 10 MW IT design and 7.5 MW adopted load per hall, 500 racks/hall, 15 kW/rack current average, chilled-water CRAH thermal contract and design-point dPUE.
Tier-gated cockpit with separate public documentation.

Non-goals

No live BMS/EPMS/DCIM acquisition or control.
No configurable field setpoint editor.
No inferred off-design PUE or facility load beyond the adopted 30 MW operating point and declared 40 MW/58 MW design point without an approved part-load curve.
No stamped engineering, procurement, safety or regulatory conclusion.
No claim that static “Normal/Online” rows are measured values.
No claim that the adopted 30 MW campus scenario is installed, energized, commissioned or measured telemetry.

04 Functional requirements

ID	Visible element / requirement	Acceptance
FR-01	Preserve the cockpit tier gate while PRD and Manual remain public.	Full access/Educator/Root policy remains owned by shared auth; docs contain no gate.
FR-02	Provide Portfolio, DC Solutions, PRD and Manual links.	All are visible in `.header-left` and keyboard reachable.
FR-03	Show title, modeled status indicator and WIB clock.	Clock changes only time; “LIVE” styling does not override simulated disclosure.
FR-04	Provide Generate Design, FAQ and Theme controls.	Each control opens/toggles the intended surface without changing the locked model.
FR-05	Provide subsystem routes to EPMS, Data Hall, Chiller Plant, Fire, Fuel, Water and ICT.	All seven links resolve and retain tooltip description.
FR-06	Show alarm state, Critical, Warning, Maintenance/Bypass, Comms, Stale, Last Update, Data Quality and Scenario.	Nine groups render before KPI content and use one snapshot/rule evaluation.
FR-07	Evaluate overall state from critical/warning counts.	CRITICAL outranks WARNING; NORMAL appears only when both are zero.
FR-08	Evaluate PUE, chiller redundancy, environment and fuel thresholds deterministically.	`paintAlarmStrip(snapshot)` returns identical counts over reloads.
FR-09	Show non-running chiller count as installed minus running while disclosing that the value includes capacity headroom, not proven maintenance.	Locked scenario reads 3 (10 installed − 7 running).
FR-10	Show PUE KPI and basis drawer.	Value 1.45 and target ≤1.5 are distinct; drawer shows facility/IT inputs.
FR-11	Show WUE KPI and basis drawer.	1.20 L/kWh IT and 600.0 L/min equivalent makeup are traceable.
FR-12	Show grid-factor KPI and basis drawer.	0.42 kgCO₂/kWh facility is not labeled as CUE.
FR-13	Show IT Load KPI and basis drawer.	30,000 kW out of 40,000 kW campus design, 75% utilization and 7,500 kW selected-hall scope are distinguishable.
FR-14	Show Uptime KPI and basis drawer.	Uptime renders — / UNAVAILABLE until an authenticated downtime event log is bound; no healthy numeric placeholder is permitted.
FR-15	Show Temperature KPI and basis drawer.	22.4°C is labeled simulated and placed against the stated band.
FR-16	Show Chillers KPI and basis drawer.	7/10 running, 5,000 kW_th/unit and central N+1 sizing reconcile to the snapshot.
FR-17	Show Alarms KPI.	Count and Normal text agree with the alarm strip.
FR-18	Show six operational image callouts.	PUE, IT, CHW, temperature, fuel and RH values retain units and engine binding where available.
FR-19	Show Efficiency stats.	PUE, WUE, Grid factor and CUE_IT remain separate rows with denominator tooltips.
FR-20	Show Power stats.	Total, IT and UPS A/B normal/failover values reconcile to the snapshot/display rule.
FR-21	Show Cooling stats.	19.4/27.0°C CHWS/CHWR, 7.6 K ΔT, 943.0 L/s IT sensible-load reference, 982.3 L/s evaporator-duty reference, 31,250 kW evaporator duty, 36,403.4 kW condenser/tower rejection and 7/10 chillers remain engine-bound. Measured header flow and per-hall allocation stay unavailable until the required instrumentation and hydronic distribution design exist.
FR-22	Show Network & Reliability stats.	Network, UPS topology and uptime remain explicitly UNAVAILABLE until dedicated topology and event authorities are bound.
FR-23	Show Environment stats.	Temperature and RH remain engine-bound; differential pressure is explicitly UNAVAILABLE without a pressure-sensor authority.
FR-24	Show Safety stats.	Overview FACP and VESDA states are UNAVAILABLE; the dedicated Fire cockpit owns validated fire authority.
FR-25	Show Fuel stats.	Bulk-tank level and 48 h autonomy remain engine-bound; per-genset day-tank level is UNAVAILABLE.
FR-26	Bind all primary derivations to one snapshot.	No `Math.random()` affects PUE, WUE, grid factor, IT, total, CHW, temperature, RH or fuel.
FR-27	Provide keyboard basis-drawer activation.	Click/Enter/Space open formula/input/output/source; Escape/scrim/close dismiss.
FR-28	Generate a controlled technical document through the shared Design Studio.	Power, cooling, water, fire, fuel, ICT/BMS, carbon and cost sections use one captured snapshot; page-approved document type and scope are explicit.
FR-29	Provide FAQ dialog.	Ten questions disclose locked scenario, standards, arithmetic and educational scope.
FR-30	Provide scroll-to-top, theme and responsive behavior.	Controls remain named, reachable and do not cause horizontal overflow.
FR-31	Separate current operating and current-plus-study document scopes.	Current uses the locked 30,000 kW adopted campus snapshot; current-plus-study adds the clearly labeled 40 MW IT / 58 MW facility design-point study without changing any cockpit value.
FR-32	Preserve source-truth coloring on the EPMS subsystem route.	Each ATS-to-rack final conductor inherits the actually energizing source path; Feed A remains A/red and Feed B remains B/green, with state text available beyond color.
FR-33	Maintain accessible Design Studio lifecycle.	Dialog title, labeled selects, snapshot/provenance, focus trap, Escape/scrim/close behavior, visible generation error and trigger focus return are present.
FR-34	Reconcile the adopted four-hall campus through one immutable contract.	`CONV_CALC.snapshot` returns 4 halls, 30 MW current IT, 40 MW design IT, 500 racks/hall, 2,000 campus racks, 15 kW/rack current average and 20 kW/rack design average.
FR-35	Reject incompatible rack-density assumptions.	As an explicit rejected counterexample only, 10 MW/hall with 200 racks yields 50 kW/rack and a blocking issue for the selected CRAH air-side thermal contract.
FR-36	Fail closed for ungoverned facility-power points.	The adopted 30 MW IT / 43.5 MW facility point and declared 40 MW IT / 58 MW facility design point are explicit; arbitrary intermediate points return unavailable until a valid monotonic part-load curve is approved.

05 Data model & telemetry points

Signal	Symbol / ID	Unit	Nominal / semantics	Source binding
Overall alarm state	`as-state`, `as-state-txt`	state	NORMAL/WARNING/ALARM from worst count.	`paintAlarmStrip(snapshot)`.
Critical / warning	`as-crit`, `as-warn`	count	0 nominal; red/amber only when non-zero.	Threshold rules.
Maintenance / bypass	`as-maint`	count	3 non-running chillers; capacity headroom, not proven maintenance.	`chillers_total − chillers_running`.
Comms / stale	`as-comms`, `as-stale`	state / count	OK / 0 if versioned snapshot exists.	`snapshot.meta`; no live transport.
Last update	`as-update`, `clock`	local time	Browser clock.	`rzTick()`.
Data quality / scenario	`as-dq`, `as-scn`	quality / mode	GOOD / Simulated.	`snapshot.meta`.
PUE	`kpiPue`, `cPue`, `sPue`	ratio	1.45; warn above 1.5.	`snapshot.site.pue`.
WUE	`kpiWue`, `sWue`	L/kWh IT	1.20.	`snapshot.environment.wue_l_per_kwh`.
Grid factor	`kpiCarbon`, `sCue`	kgCO₂/kWh facility	0.42; not CUE.	`snapshot.environment.carbon_kg_per_facility_kwh`.
CUE IT-basis	`sCueIt`	kgCO₂/kWh IT	0.609, displayed 0.61.	grid factor × PUE.
IT load	`kpiIt`, `cIt`, `sItLoad`	kW / MW	30,000 kW / 30.00 MW campus; 7,500 kW / 7.50 MW per hall.	`snapshot.site.it_load_kw`, `snapshot.campus.halls[*].it_load_kw`.
IT design / utilization	basis/report	kW / %	40,000 kW campus design; 10,000 kW/hall; 75% adopted utilization.	`snapshot.site.it_design_kw`, `snapshot.campus`.
Rack inventory / density	basis/report	rack / kW·rack⁻¹	500 racks/hall; 2,000 campus; 15 kW/rack current average; 20 kW/rack design average.	`snapshot.campus`, `snapshot.campus.halls[*]`.
Facility load	`sTotalLoad`	kW	43,500 campus; 10,875 per hall.	`snapshot.site.facility_load_kw`, hall snapshot.
Non-IT load	basis/report	kW	13,500 campus.	`snapshot.site.non_it_load_kw`.
UPS 2N load	`sUpsA`, `sUpsB`	kW / %	15,000 kW/system normal (37.5% of 40,000 kW rated); 30,000 kW/system failover (75%); 64 × 1,250 kW modules, 468.8 kW/module normal.	`snapshot.electrical`.
UPS loss	basis/report	kW	1,250 at 96% efficiency.	`snapshot.electrical.ups_loss_kw`.
CHWS / CHWR	`cChw`, `sChwSup`, `sChwRet`	°C	19.4 / 27.0; warm-water chilled-water loop derived from the 25.4°C rack-inlet target.	`snapshot.cooling`.
CHW ΔT / IT sensible-load reference	basis/report	K / L/s	7.6 / 943.0; calculated, not measured.	`snapshot.cooling.chw_delta_t`, `snapshot.cooling.flow_lps`.
Plant-duty CHW reference / measured header	basis/report	L/s	982.3 calculated / UNAVAILABLE measured.	`snapshot.cooling.heat_rejection_kw / (Cp × ΔT)`; no flow-transmitter binding.
Evaporator duty	basis/report	kW	31,250.	`snapshot.cooling.heat_rejection_kw` historical compatibility key.
Condenser / tower rejection	basis/report	kW	36,403.4.	`snapshot.cooling.tower_rejection_kw_th`.
Chiller count	KPI / Cooling row	count	7/10 running; 5,000 kW_th/unit; central N+1.	`snapshot.cooling.chillers_*`.
Temperature / RH	`kpiTemp`, `cTemp`, `cRh`, `sTempAvg`, `sRhAvg`	°C / %	22.4 / 48; warn outside 18–27°C or 20–80% RH; critical temp >32°C.	`snapshot.environment`.
Differential pressure	Environment DP	Pa	UNAVAILABLE.	No governed pressure-sensor source or timestamp.
Fuel level	`cFuel`, `sFuelMain`	%	85; source model.	`snapshot.fuel.level_pct`.
Day tank	Fuel Day Tank row	%	UNAVAILABLE.	No per-genset day-tank level in the current authority.
Usable fuel / burn / autonomy	Fuel Autonomy row / basis	L / L·h⁻¹ / h	744,144 L / 15,503 L/h / 48.0 h; warn below 24 h, critical below 12 h.	`snapshot.fuel`.
Water equivalent flow	basis/report	L/min	600.0 cooling makeup; 608.0 total treated including 8.0 domestic/process.	`snapshot.water`.
Carbon rate	basis/report	kgCO₂/h	18,270.	`snapshot.environment.carbon_kg_per_hr`.
Network / topology / uptime	Network, UPS Topology, Uptime rows	state / %	UNAVAILABLE / UNAVAILABLE / UNAVAILABLE.	No dedicated network/topology authority or authenticated downtime event log is bound.
Safety	FACP, VESDA rows	state	UNAVAILABLE.	The overview has no bound fire-panel authority; use the dedicated Fire cockpit.
Adopted rack basis	`snapshot.campus`	rack / kW·rack⁻¹	500 racks/hall × 4 halls; 15 kW current and 20 kW design average.	Campus snapshot derived from governed hall geometry.
Design-point IT	`RZConvDesignBasis.STUDY`	MW IT	10 MW/hall × 4 halls = 40 MW IT; 58 MW facility at dPUE 1.45.	Governed planning-study envelope; current adopted operating point remains 30 MW IT.
Design rack basis	`racksPerHall`, `averageRackKw`	rack / kW·rack⁻¹	500 racks/hall × 20 kW design average = 10 MW/hall; selected peak 30 kW.	Thermal compatibility gate in `conv-design-basis.js`.
Design thermal environment	`thermal`, `airReference`	°C / kPa / %RH	25.4 °C project rack-inlet target; 18–27 °C recommended envelope; 101.325 kPa, 50% RH and c_p 1.006.	Adopted design input; 25.4 °C is not presented as a universal standard.
Design efficiency	`pue.designPoint`	ratio	dPUE 1.45 at 40 MW IT; 58 MW design facility input.	Ungoverned operating points remain unavailable without an approved curve.
EPMS final source path	`w_ats_rack_*` visual class	source / energized state	Final ATS-to-rack conductor uses the selected source color.	`EPMS_Telemetry.html` topology state, not `CONV_CALC`.

06 Formulas & derivations

Facility = IT × PUE = 30,000 × 1.45 = 43,500 kWNonIT = Facility − IT = 13,500 kWfacilityLoadKw(), nonItLoadKw(); Manual §03/06.

UPS loss = IT × (1/η − 1) = 30,000 × (1/0.96 − 1) = 1,250 kWNormal shared system output = IT / 2 = 15,000 kW/systemNormal module output = IT / 64 = 468.75 kW/moduleTwo independent 40,000 kW-rated systems, each built from 32 × 1,250 kW modules; snapshot.electrical.

ΔT = 27.0 − 19.4 = 7.6 KIT sensible-load reference = 30,000 / (4.186 × 7.6) = 943.0 L/sEvaporator duty = IT + UPS loss = 31,250 kWPlant-duty reference = 31,250 / (4.186 × 7.6) = 982.3 L/sTower rejection = 31,250 + 5,153.4 = 36,403.4 kWsnapshot.cooling; both flows are calculated references and measured header flow is unavailable. CHWS derives from 25.4°C rack inlet − 6.0 K assumed coil approach.

Water flow = WUE × IT / 60 = 1.20 × 30,000 / 60 = 600.0 L/minAnnual WUE definition expressed as steady-state equivalent cooling makeup; actual instantaneous tower demand varies.

Carbon rate = Facility × grid factor = 43,500 × 0.42 = 18,270 kgCO₂/hCUE_IT = grid factor × PUE = 0.42 × 1.45 = 0.609 kgCO₂/kWh ITDenominators remain explicit.

Usable fuel = 972,737 × 0.90 × 0.85 = 744,144 LBurn = 43,500 × 0.356384 = 15,503 L/h; autonomy = 744,144 / 15,503 = 48.0 hsnapshot.fuel; tank sizing and specific consumption are assumed engineering bases, not live curves.

Current IT = 4 halls × 7.5 MW IT/hall = 30 MW ITCurrent rack density = 7,500 kW/hall ÷ 500 racks/hall = 15 kW/rack averageDesign IT = 4 × 10 MW = 40 MW; design facility input = 40 MW × dPUE 1.45 = 58 MWThe governed four-hall geometry is adopted by CONV_CALC. The 40 MW/58 MW figures remain the 100% design point; the locked operating point is 30 MW/43.5 MW.

07 UX & interaction specification

Interaction	Required behavior	Accessibility / failure behavior
Alarm strip	First read stays above disclaimer/KPIs and updates from one snapshot.	State text/counts supplement color; no pulse-only meaning.
Subsystem rail	Seven routes disclose target subsystem.	Keyboard links and tooltip text; decorative icons are not the only label.
KPI basis	Click/Enter/Space opens formula, inputs, output, scope, denominator, source, mode and timestamp.	Escape/scrim/close work and focus returns.
Generate Design	Open the shared Design Studio, capture one snapshot, and select current or current-plus-study scope before producing a print-ready document.	Scope never changes the current snapshot; dialog traps focus, closes on Escape/scrim/button, reports failures and returns focus.
EPMS source path	Route to the electrical subsystem and read conductor state from actual topology.	Source name/state supplements red/green; de-energized conductors remain visually distinct.
FAQ	Open ten expandable questions without changing data.	Dialog has title, close button, Escape behavior and readable focus order.
Theme	Switch light/dark and persist choice.	Semantic states retain contrast; no white major surface in dark mode.
Mobile	Header, KPI and panels wrap/stack without document overflow.	Primary status and PRD/Manual remain reachable at 360 px.
Restricted access	Unauthorized user receives the shared upgrade/sign-in flow.	Overlay is an alert dialog; public docs never inherit it.

08 Acceptance criteria

ID	Given / when / then	Evidence
AC-01	Given the locked snapshot, then 30,000×1.45=43,500 kW and campus, selected-hall and visible representations agree at their declared scopes.	Engine/DOM assertion.
AC-02	Given repeated reloads, then all engine-bound KPI/callout/stat values are identical.	Multi-reload comparison.
AC-03	Given the adopted normal snapshot, then alarm counts follow current engine thresholds, Maintenance/Bypass shows 3 non-running chillers with capacity-headroom disclosure, Comms=OK and Stale=0.	Direct rule/DOM assertion.
AC-04	Given PUE >1.5, then warning count increments and overall state is WARNING unless critical exists.	Injected snapshot fixture.
AC-05	Given temperature >32°C or fuel autonomy <12 h, then critical count/state agree.	Boundary fixtures.
AC-06	Given CHWS/CHWR 19.4/27.0°C, then ΔT=7.6 K, IT-load reference=943.0 L/s, plant-duty reference=982.3 L/s, evaporator duty=31,250 kW and tower rejection=36,403.4 kW; measured header flow remains unavailable.	Unit calculation plus rendered-source assertion.
AC-07	Given WUE 1.20 and IT 30,000 kW, then equivalent cooling makeup=600.0 L/min.	Unit calculation and basis drawer.
AC-08	Given grid factor 0.42, then rate=18,270 kgCO₂/h and CUE_IT=0.609.	Unit calculation and rendered stats.
AC-09	Given the fuel basis, then usable fuel=744,144 L, burn=15,503 L/h and autonomy=48.0 h.	Unit calculation and row.
AC-10	Given each seven subsystem link, then destination resolves.	Puppeteer navigation checks.
AC-11	Given each basis-enabled KPI, then click/Enter/Space opens matching content and Escape closes.	Keyboard interaction loop.
AC-12	Given Generate Design, then the report contains the same snapshot values and no literal script closer breaks parsing.	Popup capture, text checks, script audit.
AC-13	Given FAQ, then all ten questions render and the dialog closes from button, Escape and scrim.	Dialog E2E.
AC-14	Given supported tiers, then cockpit unlocks; given free/demo, then gate remains.	Tier fixtures.
AC-15	Given 360 px width, then no horizontal document overflow occurs.	Responsive measurement.
AC-16	Given dark mode, then no major white content surface appears and status contrast remains legible.	Computed-style screenshot.
AC-17	Given PRD/Manual link injection, then exactly two anchors are added and no cockpit line is deleted.	Git diff assertion.
AC-18	Given a representative full journey, then no uncaught console/page error occurs.	Captured browser error stream.
AC-19	Given Design Studio current scope, then the output contains the same 30,000 kW campus operating snapshot and labels 40 MW/58 MW only as the design point.	`tools/test-rz-design-studio.mjs` plus dialog/PDF text assertions.
AC-20	Given current-plus-study scope, then the output adds the 4 × 10 MW = 40 MW IT / 58 MW facility design-point study and leaves the adopted 30 MW `CONV_CALC.snapshot` unchanged.	`tools/test-rz-design-studio.mjs` plus snapshot before/after and document text assertions.
AC-21	Given an EPMS rack served from Feed A, Feed B or generator-backed A, then the final ATS-to-rack conductor class matches that actual source and never defaults to green.	`tools/test-epms-ats-rack-color.mjs`.
AC-22	Given the adopted campus, then 4 halls × 500 racks × 15 kW/rack reconciles exactly to 30 MW current IT, while 20 kW/rack reconciles to the 40 MW design point.	`tools/test-conv-campus-model.mjs` and `tools/test-conv-design-basis.mjs`.
AC-23	Given the explicitly rejected 200-rack counterexample at 10 MW/hall, then the design-basis gate reports 50 kW/rack and blocks it as incompatible with the selected CRAH air-side contract.	`tools/test-conv-design-basis.mjs`.
AC-24	Given a hall-owned or downstream-demand-context subsystem page, Hall A–D selection changes the selected 7,500 kW / 500-rack demand context without mutating the 30,000 kW site snapshot; a site utility with no valid hall context exposes no selector.	Subsystem operator tests and browser journey.
AC-25	Given an alarm history query, then date range, system/point, severity, lifecycle/state, quality and value criteria compose deterministically and remain exportable.	Alarm-query unit and keyboard E2E.
AC-26	Given the fire cause, then every displayed effect identifies commanded state, feedback state, inhibit reason and responsible authority.	Fire cause/effect regression test.
AC-27	Given 390, 768, 1280 and 1920 px viewports, then each subsystem retains status-first hierarchy with no document overflow or overlapping schematic labels.	Playwright screenshots and responsive-layout gate.

09 Non-functional requirements

Performance

First meaningful overview within 2.5 s on a mid-tier mobile CPU with local assets.
One-second clock and five-second rebind remain idempotent and leak-free.
Generated report opens within 1 s after snapshot capture.

Accessibility

WCAG 2.2 AA, 44 px mobile actions and visible amber focus.
Basis cards and dialogs have full keyboard path.
Units, source and state remain available beyond color.

Reliability

Missing snapshot becomes FAULT/unavailable, never a silently trusted fallback.
All calculations stay pure and deterministic.
Static/placeholder rows remain explicitly classified.

Security

Shared auth owns the tier decision; no secret in markup.
Docs remain public and carry no auth bypass.
No dashboard interaction sends a control command.

10 Provenance & sources

Source	Governs	Binding / use
`dc-conventional.html`	Visible controls, KPI cards, alarm rules, report, FAQ and gate.	Primary implementation source.
`js/conv-engine.js`	Immutable constants and all primary derived values.	`CONV_MODEL`, `CONV_CALC.snapshot`.
`js/rz-design-studio.js`	Shared document type/scope selection, current snapshot/provenance display and accessible dialog lifecycle.	Current and current-plus-study document control.
`EPMS_Telemetry.html`	Electrical source topology and ATS-to-rack conductor state/color.	Subsystem evidence; does not redefine dashboard power values.
Conventional DC Manual	Formula definitions, worked scenario, standards and limitations.	Public methodology companion.
Conventional review docs 00, 01, 09 and 12	Single capacity basis, dashboard direction, engineering calculations and QA criteria.	Requirements/risk authority.
ISO/IEC 30134-2:2026	PUE definition and reporting boundary.	Power-efficiency KPI and dPUE study-point context.
ISO/IEC 30134-9:2022	WUE definition, measurement categories and interpretation.	Water-efficiency KPI and equivalent-flow disclosure.
ISO/IEC 30134-8	CUE definition.	0.609 kgCO₂/kWh IT derivation.
ASHRAE TC 9.9	Thermal envelope context.	22.4°C/48% interpretation; site setpoints still require approval.
ASHRAE 90.1 / CIBSE Guide F / EN 50600	Facility energy and infrastructure design context.	Design/report background, not automatic compliance.
Uptime Institute Tier Standard	Resilience/topology intent.	Tier-III intent and fuel-resilience context; certification not claimed.
IEC 60364 / IEC 60909 / IEEE 1100	Power installation, fault and power-quality context.	Generated-design references; detailed studies out of scope.
NFPA 75/76	IT fire-protection context.	Safety subsystem reference; static Normal state is not compliance evidence.
ISA-18 alarm-management series	Alarm lifecycle, operator response and rationalization context.	Future historian/alarm-management direction; current page remains simulated.
IEC 62682:2022	Management of alarms for process industries.	Terminology and acceptance context, not a certification claim.

Subsystem operator contracts

These contracts are part of this master PRD and govern the dedicated Chiller, Fire, Fuel, Water and ICT pages. The page manuals remain the formula and operating-methodology authority; this section defines required product behavior and acceptance.

Subsystem	Required operator view	Current/design rule	Fail-safe / acceptance
Chiller plant	ISA-style topology, CHWS/CHWR, ΔT, reference-flow reconciliation, differential pressure, evaporator/tower duties, plant kW/ton/COP context, lead-lag, duty/standby/fault, N+1 headroom, equipment inspector and Hall A–D context.	Current 31,250 kW evaporator duty, 36,403.4 kW tower rejection, 19.4/27.0°C, calculated 943.0/982.3 L/s references and 7/10 chillers stay engine-bound. Measured header flow and per-hall allocation remain unavailable without instrumentation and a hydronic distribution design.	No cyan/green “running” cue may hide warning/trip. Selection opens a keyboard-accessible diagnostic view; no overlay or clipping from 390–1920 px.
Fire protection	FACP/VESDA authority, fire-water/inert-agent process mimic, reserve/pump/valve feedback, staged cause/effect and explicit interlock list for lift recall, access/door release, AHU/fan stop, smoke/fire damper, EPO, BMS/DCIM and notification.	Protected hall/rack counts are context only; suppression sizing remains in the fire calculation authority and AHJ-approved design.	Simulation cannot masquerade as field command. Cause and effect show commanded, proven, inhibited and unavailable separately; active fire red is never used as a medium color.
Fuel system	Bulk/day tank inventory, transfer path, two-pump duty/standby, polishing mode and ΔP, water-in-fuel, leak/sump zones, deliveries, consumption and N+1 autonomy.	Current autonomy remains 744,144 L ÷ 15,503 L/h = 48.0 h. Operational sizing still requires approved generator count/load curves and tank policy; no unqualified proportional extrapolation.	Leak or low-low state identifies zone and isolation consequence. Pump override remains visibly simulated and interlocked.
Water treatment	Raw/treated storage, duty/standby pumps, filter ΔP, chemical dosing, UV, conductivity/TDS, cooling makeup, blowdown, domestic split, leak/drain and maintenance state.	Current WUE-equivalent cooling makeup of 600.0 L/min remains distinct from measured flow; total treated flow is 608.0 L/min including 8.0 L/min domestic/process. The balance applies because evaporative cooling-tower heat rejection is adopted.	Pump symbol and animation follow ISA state, not decorative spin. Makeup and blowdown reconcile with scope/quality labels and sensor provenance.
ICT / OT network	Core/distribution/access and BMS/OT paths, installed/usable/N+1 capacity, bandwidth/latency/loss/jitter, redundancy, cyber boundary, gateway reachability, alarm history and selected-link detail.	Current traffic remains an authored snapshot. Design port/rack capacity derives from 500 racks/hall and documented oversubscription, not from IT MW alone.	Topology must remain readable without line-label collision; link state has text plus color; unknown/stale quality is not shown as healthy.

Alarm-history contract: every subsystem exposes a common query vocabulary: from/to timestamp, system, point/tag, severity, lifecycle/state, value comparator, quality and acknowledgement. Empty results disclose the active filter; CSV export preserves source timestamp, quality and lifecycle. Filtering is read-only and never issues a control command.

11 Open questions & risks

Risk / open question	Current evidence	Required resolution
“LIVE” label conflicts with modeled data.	Header says LIVE while scenario/FAQ says Simulated/BOD locked.	Replace or qualify the label in a separately authorized cockpit change.
Uptime is not measured.	The KPI and drawer fail closed as — / UNAVAILABLE because no downtime event log is bound.	Bind authenticated, dated downtime events before rendering any numeric YTD uptime.
Several subsystem overview rows remain unavailable.	Network, UPS topology, FACP, VESDA, differential pressure and day-tank values have no governed overview authority.	Bind a validated model/source/quality/timestamp before replacing UNAVAILABLE.
Electrical nameplates are assumed pending Basis of Design.	The engine derives 64 × 1,250 kW UPS modules across two 40 MW-rated systems; normal sharing is 15 MW/system.	Replace assumed module rating/topology only with an approved equipment schedule; all dependent values must re-derive.
Alarm freshness is synthetic.	Stale=0 because snapshot is frozen; Last Update is browser time.	Distinguish model evaluation time from acquisition/sample time.
Maintenance semantics are overloaded.	Standby chiller count is shown as Maint/Bypass.	Separate planned maintenance, bypass and available standby capacity.
WUE flow is an annual-equivalent rate.	600.0 L/min is not an instantaneous cooling-tower measurement.	Keep scope label visible and bind actual makeup/blowdown if introduced.
Grid factor is fixed.	0.42 has no displayed geography/date/version in the dashboard.	Add source vintage and location/market basis before sustainability reporting.
Fuel consumption is a scaled design assumption.	15,503 L/h derives from 43,500 kW × 0.356384 L/kWh, not a vendor multi-set load curve.	Use approved generator curves and running-set allocation for operational autonomy.
Warm-water CHW level is assumed.	CHWS 19.4°C derives from the 25.4°C rack inlet target minus a 6.0 K assumed coil approach; CHWR is 27.0°C at the adopted 7.6 K rise.	Replace the approach only with an approved coil selection and re-run every dependent cooling gate.
Per-hall chiller allocation is unavailable.	The 7/10 N+1 plant is central and the engine intentionally returns no hall allocation.	Provide the hydronic distribution topology and isolation philosophy before allocating units to halls.
Generated design breadth exceeds validated snapshot.	Report includes fire, water chemistry and cost assumptions beyond primary dashboard points.	Maintain section-level source/assumption tags and independent calculation tests.
Access policy wording may drift.	Comments, overlay and shared feature flags have changed historically between Full access/Educator/Root descriptions.	Test the canonical policy; docs must not become an alternate access path.
Design capacity may be mistaken for current load.	The adopted operating point is 4 × 7.5 MW = 30 MW IT; 4 × 10 MW = 40 MW IT and 58 MW facility are the declared 100% design point.	Keep current/design-point scope labels and require discipline-specific sizing before procurement or commissioning use.
EPMS color can drift from topology truth.	A final ATS-to-rack segment previously used a fixed green class even when energized from the red/A path.	Derive the final segment from actual source state and keep the four-scenario regression test mandatory.

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