Why is the cockpit locked — no user inputs?

The EPMS/BMS cockpit is a simulated monitoring and anomaly-detection aid, not a design calculator or live field-control system. Its numbers represent one adopted four-hall engineering scenario: 30,000 kW current IT, 40,000 kW design IT, 2,000 racks and PUE 1.45. Allowing arbitrary inputs would break the governed accuracy contract and produce engineering-indefensible output. All KPIs are derived deterministically from CONV_CALC.

What is the canonical chilled-water loop basis?

The adopted warm-water CHW loop runs at 19.4 °C supply / 27.0 °C return (ΔT = 7.6 K). CHWS derives from the 25.4 °C rack-inlet target minus a 6.0 K assumed coil approach; CHWR adds the adopted 7.6 K rise. The separate condenser-water loop is 32.0/37.0 °C and must not be labelled CHWS/CHWR.

How is WUE derived and what does 600 L/min mean?

WUE = 1.20 L/kWh is the site water-usage effectiveness target under ISO/IEC 30134-9. The cockpit converts it to an equivalent average cooling-makeup flow: 1.20 × 30,000 / 60 = 600.0 L/min. It is not relabeled as a measured instantaneous cooling-tower flow; 8.0 L/min domestic/process demand is excluded from WUE.

Conventional DC — EPMS & BMS Cockpit — Technical Manual & Methodology

01 Purpose & engineering basis

The Conventional DC cockpit is a simulated EPMS/BMS monitoring and anomaly-detection aid for a chilled-water, UPS-backed, generator-protected data centre. It answers five questions within one deterministic scenario: what is the modeled energy balance, is cooling performing within design, how are the UPS modules loaded, how much fuel autonomy remains, and how do site sustainability metrics (PUE/WUE/CUE) compare to design targets. It neither connects to nor controls field equipment.

This page is a cockpit, not a calculator. Its basis of design is fixed: the scenario constants in CONV_MODEL (locked, deep-frozen) drive every displayed number. The governing accuracy contract is the ACCURACY_VALIDATION 6 rules (one source of truth · no Math.random on basis KPIs · explicit denominator on every metric · marketing target ≠ derived value · terminology must match engineering basis · basis chip on every critical KPI), plus the 23 acceptance tests in tools/probe-accuracy-validation.mjs. Basis document: conv/review/09-engineering-basis-and-calculations.md.

02 Inputs — locked basis-of-design

There are no user inputs. The table distinguishes authored/adopted inputs from the derived campus snapshot in CONV_MODEL and CONV_CALC.snapshot. Capacity geometry comes from the governed four-hall design basis; equipment nameplates remain explicitly assumed pending Basis-of-Design confirmation.

Parameter	Symbol / key	Value	Unit	Source
Hall count	`campus.hall_count`	4	hall	Governed four-hall design basis; adopted geometry
IT design capacity	`site.it_design_kw`	40 000 campus / 10 000 per hall	kW	Derived from 4 governed halls
IT load (adopted current)	`site.it_load_kw`	30 000 campus / 7 500 per hall	kW	Adopted normal scenario; simulated, not measured
Rack inventory	`campus.racks_total`	2 000 campus / 500 per hall	rack	Governed hall geometry
Rack current / design average	`rack_actual_avg_kw / rack_design_avg_kw`	15 / 20	kW/rack	Derived current load / governed design basis
Power usage effectiveness	`pue`	1.45	—	doc-09 line 11
Water usage effectiveness	`wue_l_per_kwh`	1.20	L/kWh	doc-09 line 13
Grid carbon intensity	`carbon_kg_per_facility_kwh`	0.42	kgCO₂/kWh	doc-09 line 14, denominator = facility kWh
Cold-aisle average temperature	`avg_temp_c`	22.4	°C	doc-01 §Right-Side Stats Panel; ASHRAE TC9.9 recommended band
Average relative humidity	`avg_rh_pct`	48	%	doc-01/09 environment row; ASHRAE 40–60% band midpoint
Rack-inlet target	`rack_inlet_target_c`	25.4	°C	Adopted project target
CHW coil approach	`chw_coil_approach_k`	6.0	K	Assumed pending coil selection
CHW supply / return	`chws_c / chwr_c`	19.4 / 27.0	°C	Derived thermal chain; 7.6 K adopted rise
Chillers running / total	`chillers_running / chillers_total`	7 / 10	—	Derived at 5,000 kW_th/unit and central N+1; unit rating assumed
UPS efficiency	`ups_efficiency`	0.96	—	Retained sourced efficiency; current computed loss is 1,250 kW
UPS module topology (2N)	`ups_module_count`	64 total; 32/system × 1 250 kW	module / kW	Derived from 40 MW design and 2N; module rating assumed
EPMS metering tolerance	`metering_tolerance_pct`	2	%	doc-12 line 9 "within 2%"
Fuel tank capacity	`tank_capacity_l`	972 737	L	Assumed tank sizing to retain the 48 h target at current campus burn
Tank usable fraction	`usable_fraction`	0.90	—	doc-09 line 141
Fuel level	`level_pct`	85	%	doc-09 lines 16, 126
Specific fuel consumption	`specific_consumption_l_per_kwh`	0.356384	L/kWh	Sourced rate retained across the campus rebaseline; the retired fixed burn nameplate is not reused

Accuracy rule 4: None of these values is a marketing target presented as a measured outcome. PUE 1.45 is the engineering basis from doc-09, not a best-in-class aspirational figure. The cockpit displays these as design basis chips, not live telemetry.

03 Calculation methodology

All derivations are pure functions inside CONV_CALC. Function names below map one-to-one to js/conv-engine.js. No formula exists outside the engine.

Facility and non-IT load

Facility = IT × PUE → 30 000 × 1.45 = 43 500 kW Non-IT = Facility − IT → 43 500 − 30 000 = 13 500 kW In facilityLoadKw(m), nonItLoadKw(m). Facility is the total metered input to the site; Non-IT covers cooling, lighting, UPS losses, and all ancillaries. Both are rendered on the dashboard energy panel.doc-09 lines 25–28, 32–34

PUE reconciliation

PUE = Facility / IT = 43 500 / 30 000 = 1.45 (identity check) The cockpit renders PUE as the ratio Facility÷IT. The locked value must always reconcile to exactly 1.45 — any other display would violate accuracy rule 1 (one source of truth). Denominator is IT load (not design capacity).doc-09 line 11; ACCURACY_VALIDATION rule 3

UPS losses

UPS loss = IT × (1/η − 1) → 30 000 × (1/0.96 − 1) = 1 250 kW Normal shared system load = IT / 2 → 30 000 / 2 = 15 000 kW/system Normal module load = IT / 64 → 30 000 / 64 = 468.75 kW/module In upsLossKw(m), upsSystemKw(m), upsModuleKw(m). Two independent 2N systems each have 32 × 1,250 kW modules and 40,000 kW rated capacity; each system can carry the full protected load. Normal operation shares 15,000 kW per system, while failover is 30,000 kW on one system. Equipment ratings are assumed pending an approved schedule.governed 2N resilience contract; engine v2.0.0

Chilled-water loop

CRAH supply = rack inlet − supply mixing → 25.4 − 0.0 = 25.4 °C CHWS = CRAH supply − coil approach → 25.4 − 6.0 = 19.4 °C ΔT = CHWR − CHWS → 27.0 − 19.4 = 7.6 K IT sensible-load CHW reference = IT / (Cp × ΔT) → 30 000 / (4.186 × 7.6) = 943.0 L/s Evaporator duty = IT + UPS loss → 30 000 + 1 250 = 31 250 kW Plant-duty CHW reference = Qevap / (Cp × ΔT) → 31 250 / (4.186 × 7.6) = 982.3 L/s Condenser/tower rejection = Qevap + chiller kW → 31 250 + 5 153.4 = 36 403.4 kW In crahSupplyAirC(m), chwsC(m), chwrC(m), chwFlowLps(m) and the historical compatibility function heatRejectionKw(m). Despite that API name, snapshot.cooling.heat_rejection_kw is evaporator duty; true tower rejection is tower_rejection_kw_th. Cp = 4.186 kJ/(kg·K) for water. The 6.0 K coil approach is assumed pending selection. Both flow values are calculated references; measured header flow is UNAVAILABLE. The separate condenser-water loop is 32.0/37.0°C and must not be labelled CHWS/CHWR.governed rack-inlet target; engine v2 thermal chain

Water usage effectiveness (WUE)

WUE = annual cooling makeup water [L] / annual IT energy [kWh] = 1.20 L/kWh Equivalent cooling makeup = (WUE × IT) / 60 → (1.20 × 30 000) / 60 = 600.0 L/min Total treated flow = cooling makeup + domestic/process → 600.0 + 8.0 = 608.0 L/min In waterFlowLpmForWue(m). WUE definition and reporting context follow ISO/IEC 30134-9. The cockpit shows a steady-state equivalent cooling-makeup rate, not a measured instantaneous flow. Domestic/process demand is excluded from WUE.CONV_CALC.snapshot.water.flow_lpm_for_wue; engine v2.0.0; ISO/IEC 30134-9:2022

Carbon usage effectiveness (CUE)

CUE = carbon emission rate [kgCO₂/hr] / IT power [kW] Carbon rate = Facility × grid factor → 43 500 × 0.42 = 18 270 kgCO₂/hr CUE (IT-basis) = grid factor × PUE → 0.42 × 1.45 = 0.609 kgCO₂/kWh-IT In carbonKgPerHr(m). CUE per ISO/IEC 30134-8 uses the facility-energy denominator for the grid carbon factor (0.42 kgCO₂/kWh is stated as a facility-energy intensity in doc-09 line 14). The IT-basis form CUE = grid factor × PUE is a derived identity. Denominator must be explicit on every CUE display (accuracy rule 3).doc-09 lines 155–158, 167; ISO/IEC 30134-8

Fuel autonomy

Usable fuel = capacity × usable fraction × fill level = 972 737 × 0.90 × 0.85 = 744 144 L Generator burn = Facility × specific consumption = 43 500 × 0.356384 = 15 503 L/hr Autonomy = usable fuel / generator consumption rate = 744 144 / 15 503 = 48.0 hr In generatorConsumptionLph(m), fuelUsableL(m), fuelAutonomyHr(m). The 48 hr value is this project's assumed tank-sizing result. It does not prove an Uptime Tier or universal minimum; approved generator curves, running-set allocation, refuelling logistics and authority requirements govern operational duration.sourced specific-consumption rate; adopted campus basis

Rack inventory and density

Campus rack inventory = 4 halls × 500 racks/hall = 2 000 racks Current average density = 30 000 kW / 2 000 racks = 15 kW/rack Design average density = 40 000 kW / 2 000 racks = 20 kW/rack The selected hall always retains 500 racks, 7,500 kW current load and 15 kW/rack current average. These are governed geometry and scenario values, not equivalent-rack estimates.governed four-hall rack basis; engine v2.0.0

EPMS power metering

EPMS total = Facility load = 43 500 kW (nominal; tolerance band ±2%) EPMS UPS output = IT load = 30 000 kW (mechanical on gen-backed board) In epmsTotalKw(m), epmsUpsOutputKw(m). Metering tolerance ±2% is a quality flag, not an applied offset — the cockpit shows nominal values. EPMS = Electrical Power Monitoring System.doc-00 line 77; doc-12 line 9

Governed four-hall operating and design points

Current IT = 4 halls × 7.5 MW IT/hall = 30 MW IT Current rack basis = 500 racks/hall × 15 kW/rack average = 7.5 MW IT/hall Design IT = 4 halls × 10 MW IT/hall = 40 MW IT Design rack basis = 500 racks/hall × 20 kW/rack average = 10 MW IT/hall Design facility input = 40 MW IT × dPUE 1.45 = 58 MW at the declared 100% design point The governed RZConvDesignBasis.STUDY supplies the adopted geometry and 100% capacity envelope; CONV_CALC supplies the locked 30 MW operating point. Its rack thermal contract is chilled-water CRAH with a 25.4°C rack-inlet target. As an explicit rejected counterexample only, 200 racks/hall would imply 50 kW/rack and fails that selected air-side contract. The 40 MW/58 MW result is a design point, not current telemetry; part-load performance beyond the adopted point remains unavailable without an approved curve.

04 Constants & data sources

Every constant lives in the deep-frozen CONV_MODEL object with a // source: tag pointing to conv review doc line numbers. The snapshot table confirms all computed intermediates at the locked basis point.

Computed quantity	Function	Result	Unit
Facility load	`facilityLoadKw()`	43 500	kW
Non-IT load	`nonItLoadKw()`	13 500	kW
UPS loss	`upsLossKw()`	1 250	kW
CHW ΔT	`chwDeltaT()`	7.6	K
IT sensible-load CHW reference	`chwFlowLps()`	943.0	L/s
Plant-duty CHW reference	`heatRejectionKw() / (Cp × ΔT)`	982.3	L/s
Measured CHW header flow	not bound	UNAVAILABLE	L/s
Evaporator duty	`heatRejectionKw()` compatibility API	31 250	kW
Condenser / tower rejection	`snapshot.cooling.tower_rejection_kw_th`	36 403.4	kW
UPS per-module load	`upsModuleKw()`	468.8	kW
UPS per-system load	`upsSystemKw()`	15 000	kW
Cooling makeup flow	`waterFlowLpmForWue()`	600.0	L/min
Carbon emission rate	`carbonKgPerHr()`	18 270	kgCO₂/hr
Usable fuel	`fuelUsableL()`	744 144	L
Generator fuel burn	`generatorConsumptionLph()`	15 503	L/hr
Fuel autonomy	`fuelAutonomyHr()`	48.0	hr

Accuracy rule 2: None of these values involves Math.random(). Every number is stable on reload, reproducible in Node, and covered by the current tools/test-conv-calc.mjs and campus-model assertions.

05 Outputs & cockpit panels

The cockpit surfaces these derived quantities across its dashboard, EPMS, cooling, water, fuel, and sustainability panels. Each KPI carries a basis chip citing its source.

KPI	CONV_CALC function	Unit	Panel
IT load	`model.site.it_load_kw`	kW	Energy dashboard
Facility load	`facilityLoadKw()`	kW	Energy dashboard / EPMS total
Non-IT load	`nonItLoadKw()`	kW	Energy breakdown
PUE	Facility / IT (identity)	—	Sustainability header
WUE	`model.environment.wue_l_per_kwh`	L/kWh	Sustainability / water panel
CUE (IT-basis)	grid factor × PUE	kgCO₂/kWh-IT	Sustainability panel
Carbon rate	`carbonKgPerHr()`	kgCO₂/hr	Sustainability panel
UPS loss	`upsLossKw()`	kW	EPMS electrical panel
UPS per-module kW	`upsModuleKw()`	kW	EPMS UPS A / UPS B gauges
CHW supply / return	`model.cooling.chws_c / chwr_c`	°C	Cooling panel — primary loop only
CHW ΔT	`chwDeltaT()`	K	Cooling panel
IT sensible-load CHW reference	`chwFlowLps()`	L/s	Cooling panel; calculated, not measured
Plant-duty CHW reference	`heatRejectionKw() / (Cp × ΔT)`	L/s	Cooling reconciliation; calculated, not measured
Evaporator duty	`heatRejectionKw()` compatibility API	kW	Cooling plant duty
Condenser / tower rejection	`snapshot.cooling.tower_rejection_kw_th`	kW	Condenser-water / heat-rejection plane
Chillers running / total	`model.cooling.chillers_*`	—	Cooling panel status
Water makeup flow	`waterFlowLpmForWue()`	L/min	Water panel
Fuel level / usable	`model.fuel.level_pct / fuelUsableL()`	% / L	Fuel panel gauge
Fuel autonomy	`fuelAutonomyHr()`	hr	Fuel panel — 48 hr project/model result
Rack inventory / current density	`snapshot.campus`	rack / kW·rack⁻¹	2,000 campus / 500 per hall / 15 kW current average
Avg temperature / RH	`model.environment.avg_temp_c / avg_rh_pct`	°C / %	Environment panel
EPMS metering tolerance	`model.electrical.metering_tolerance_pct`	%	EPMS quality chip
Current Design Studio snapshot	`CONV_CALC.snapshot`	kW	Current scope: locked 30,000 kW campus IT / 43,500 kW facility
Four-hall design-point appendix	4 × 10 MW IT; 500 racks/hall; 20 kW/rack design average	MW IT / rack / kW·rack⁻¹	Current-plus-study scope: governed 40 MW IT / 58 MW facility design-point study

Release acceptance	Executable evidence	Required invariant
Locked calculation chain	`tools/test-conv-calc.mjs` and `tools/test-conv-campus-model.mjs`	The current snapshot retains 30,000 kW IT, four equal 7,500 kW halls and all documented identities.
Design Studio scopes	`tools/test-rz-design-studio.mjs` plus browser/PDF journey	Current renders the adopted 30 MW operating point; current-plus-study adds the governed 40 MW/58 MW design-point study without mutating `CONV_CALC.snapshot`.
EPMS source truth	`tools/test-epms-ats-rack-color.mjs`	Normal, tie and generator scenarios derive the final ATS-to-rack conductor from its actual energizing source.
Accessible document flow	Keyboard and dialog browser journey	Labeled controls, focus trap, Escape/scrim/close and trigger-focus return remain intact; failures are visible.

06 Worked example — adopted 30 MW campus scenario

Full derivation chain reproducing every primary KPI on the simulated cockpit exactly. All figures match CONV_CALC.snapshot.

Facility load: 30 000 × 1.45 = 43 500 kW
Non-IT load: 43 500 − 30 000 = 13 500 kW
PUE reconciliation: 43 500 / 30 000 = 1.45 ✓ (identity holds)
UPS loss: 30 000 × (1/0.96 − 1) = 1 250 kW · normal system load: 30 000 / 2 = 15 000 kW · module load: 30 000 / 64 = 468.75 kW
CHW references: 27.0 − 19.4 = 7.6 K · IT sensible-load reference: 30 000 / (4.186 × 7.6) = 943.0 L/s · evaporator-duty reference: 31 250 / (4.186 × 7.6) = 982.3 L/s · measured header flow: UNAVAILABLE
Thermal duties: evaporator: 30 000 + 1 250 = 31 250 kW · condenser/tower: 31 250 + 5 153.4 = 36 403.4 kW
WUE check: 1.20 L/kWh (basis) · equivalent cooling makeup: (1.20 × 30 000) / 60 = 600.0 L/min
Carbon rate: 43 500 × 0.42 = 18 270 kgCO₂/hr · CUE (IT-basis): 0.42 × 1.45 = 0.609 kgCO₂/kWh-IT
Usable fuel: 972 737 × 0.90 × 0.85 = 744 144 L · burn: 43 500 × 0.356384 = 15 503 L/hr · autonomy: 744 144 / 15 503 = 48.0 hr
Rack reconciliation: 4 × 500 = 2 000 racks · 30 000 / 2 000 = 15 kW/rack current average

Engineering reading: the cockpit operates at 75% of modeled IT design capacity (30,000/40,000 kW), equally allocated as 7,500 kW across four 500-rack halls. PUE 1.45 and 48 h autonomy are declared scenario values, not universal quality grades, code baselines or Tier evidence. Operational targets require an approved metering boundary, load profile, climate basis, risk policy and certification review.

07 References & standards

conv review doc 09 — 09-engineering-basis-and-calculations.md: primary source for all scenario constants (IT load, PUE, WUE, CHW loop, UPS efficiency, fuel system). Line numbers cited throughout.
ASHRAE 90.1 — Energy Standard for Buildings: PUE benchmarks and baseline cooling-system design parameters for conventional chilled-water data centres.
ASHRAE TC9.9 — Thermal Guidelines for Data Processing Environments: cold-aisle temperature and RH recommended bands (A1/A2 class).
Uptime Institute Tier Standard — topology and concurrently-maintainable design intent; the cockpit does not claim certification or infer a universal fuel duration.
ISO/IEC 30134-2:2026 — Data-centre Power Usage Effectiveness (PUE) definition and reporting boundary.
ISO/IEC 30134-9:2022 — Water Usage Effectiveness (WUE) definition, measurement categories, calculation and reporting interpretation.
ISO/IEC 30134-8 — Key Performance Indicators for Data Centres — Part 8: Carbon Usage Effectiveness (CUE). Denominator = IT energy; grid carbon factor applied at facility-energy basis per doc-09 line 14.
Engine source — js/conv-engine.js (CONV_CALC v2.0.0 + CONV_MODEL, deep-frozen). Gates: tools/test-conv-calc.mjs and tools/test-conv-campus-model.mjs.
Accuracy gate — tools/probe-accuracy-validation.mjs plus the strict ship gate. Every required assertion must pass before any cockpit change ships.
Design-document source — js/rz-design-studio.js governs shared document type/scope validation and accessible dialog state; dc-conventional.html supplies the 30 MW current snapshot and 40 MW/58 MW design-point appendix.
Electrical topology source — EPMS_Telemetry.html owns modeled source selection and the final ATS-to-rack conductor class; regression evidence is tools/test-epms-ats-rack-color.mjs.
ISA-18 alarm-management series — lifecycle, operator response and rationalization context for future alarm-management work.
IEC 62682:2022 — alarm-management terminology and acceptance context; inclusion is not a conformance claim.

08 Assumptions & limitations

The cockpit models a single fixed engineering scenario. It is not a design calculator and cannot be parameterised. Key assumptions and scope boundaries:

CHW loop: The adopted warm-water chilled-water loop is 19.4/27.0°C at 7.6 K rise. CHWS derives from the 25.4°C rack-inlet target and an assumed 6.0 K coil approach pending equipment selection. The separate condenser-water loop is 32.0/37.0°C and is never labelled CHWS/CHWR.

UPS topology: The 2N model has two independent systems, each rated 40,000 kW using 32 × 1,250 kW assumed modules. Normal load is 15,000 kW/system and 468.8 kW/module; failover places 30,000 kW on one system. Static bypass and detailed fault selectivity require an approved topology study.

Fuel consumption: 15,503 L/hr derives from 43,500 kW facility load × 0.356384 L/kWh. It is an engineering sizing assumption, not a live meter or a substitute for vendor part-load curves and running-set allocation.

WUE and water flow: The 600.0 L/min figure is the steady-state equivalent cooling makeup derived from annual WUE. Actual cooling-tower blowdown, drift loss and basin makeup vary with ambient wet-bulb temperature. Domestic/process demand adds 8.0 L/min but is excluded from WUE.

Carbon intensity: 0.42 kgCO₂/kWh is a fixed grid-average factor from the engineering basis. Real-time grid decarbonisation, marginal emissions, and Scope 2 market-based accounting are out of scope.

Capacity planning: Four 500-rack halls are adopted: each hall carries 7.5 MW current IT at 15 kW/rack average and has 10 MW design IT at 20 kW/rack average. The 30 MW current scenario is simulated/adopted, not installed, energized, commissioned or measured evidence. The 40 MW IT / 58 MW facility values remain the 100% design point.

Design-point efficiency: 1.45 is the declared PUE at the adopted operating point and dPUE at 100% design, not an approved part-load curve or annual measured PUE. Other operating points fail closed until an approved monotonic curve is supplied.

Design Studio: The current scope is generated from the captured 30 MW CONV_CALC.snapshot. The current-plus-study scope appends the governed 40 MW/58 MW design-point study; changing scope does not change cockpit data.

This manual and the cockpit are an engineering education and operational reference aid. They do not substitute for a live DCIM/EPMS/BMS with calibrated sensors, metered telemetry, and alarm setpoints set by a qualified controls engineer to the site authority having jurisdiction.

09 Cockpit controls & telemetry map

The dashboard is a facility overview rather than a command HMI. Its controls navigate, explain or report the locked scenario; none writes to BMS/EPMS equipment.

Control / surface	Hook	Expected behavior	Data or safety boundary
Portfolio / DC Solutions / PRD / Manual	`.back-btn`	Navigate without changing `CONV_CALC.snapshot`.	PRD and Manual are public; cockpit access remains tier-controlled.
Generate Design / Design Studio	`genDesignTrigConv`, `RZDesignStudio`	Open the shared dialog, show captured snapshot/provenance, and select current or current-plus-study before generating the approved document type.	The design-point study appendix cannot mutate current values; focus is trapped and returned, and generation failure remains visible.
FAQ	`faqTrigConv`	Open ten explanatory questions; close by button, scrim or Escape.	Answers disclose locked, simulated and non-procurement scope.
Theme	`themeToggle`	Switch/persist light or dark theme.	Never changes values or threshold results.
Subsystem routes	`.nav-menu-item`	Open EPMS, Data Hall, Chiller, Fire, Fuel, Water or ICT pages.	Status copy in this overview is not a substitute for subsystem detail.
EPMS source-truth path	`w_ats_rack_*` in `EPMS_Telemetry.html`	Carry the actual selected source state through the ATS and its final rack conductor in normal, tie and generator scenarios.	Feed A is red/A and Feed B is green/B; source/state text supplements color, and no click issues a field command.
Alarm strip	`alarmStrip`	Show overall state, critical, warning, maintenance/bypass, comms, stale, last update, quality and scenario first.	Counts are evaluated from a frozen model; Last Update is browser time.
PUE basis	`.kpi-card[data-basis-param="site.pue"]`	Open formula, 30,000 kW IT / 43,500 kW facility / 13,500 kW non-IT inputs, scope, denominator and source.	1.45 is the adopted design-point ratio and facility load reconciles as IT × PUE; ≤1.5 is a target.
WUE basis	`data-basis-param="environment.wue_l_per_kwh"`	Explain annual definition, IT denominator and 600.0 L/min equivalent cooling makeup.	Equivalent steady-state rate is not an instantaneous tower meter.
Grid-factor basis	`data-basis-param="environment.carbon_kg_per_facility_kwh"`	Separate 0.42 kgCO₂/kWh facility from CUE_IT and 18,270 kgCO₂/h current rate.	Factor needs geography/date/version before reporting.
IT-load basis	`data-basis-param="site.it_load_kw"`	Show 30,000/40,000 kW campus, 75% utilization and selected-hall scope.	Simulated/adopted BOD, not a meter stream.
Uptime basis	`data-basis="uptime"`	Explain — / UNAVAILABLE and the required downtime event log.	No numeric or healthy-state placeholder is allowed until an authenticated outage ledger is bound.
Temperature basis	`data-basis="temp"`	Explain 22.4°C against the referenced thermal band.	Simulated aggregate, not a sensor roll-up.
Chiller basis	`data-basis-param="cooling.chillers_running"`	Explain 7/10 operation, 5,000 kW_th/unit assumption and central N+1 sizing.	Three non-running units include capacity headroom and are not automatically maintenance/bypass events.
KPI keyboard path	`.kpi-card[data-basis-param]`	Enter/Space opens; Escape, scrim and Close dismiss; focus returns.	All meaning remains textual, not color-only.
Facility image callouts	`cPue`, `cIt`, `cChw`, `cTemp`, `cFuel`, `cRh`	Show the six operational values on their physical context image.	Image is contextual; right panel and basis drawers are authoritative for scope.
Right statistics panel	`s*` IDs plus static rows	Group Efficiency, Power, Cooling, Reliability, Environment, Safety and Fuel.	Engine-bound and static presentation rows must remain visibly distinguishable.
Scroll to top	`scrollTopBtn`	Return to header without changing the scenario.	Respect reduced-motion preference.
Sign in	`rootLoginBtn` / shared gate	Open the shared authentication/upgrade flow for an unauthorized cockpit user.	It grants no access to public docs because they are already public.

10 Alarm, quality & operating interpretation

Primary arithmetic is deterministic. Several context rows remain static placeholders. The following map prevents a reader from assigning the same trust level to both classes.

Point family	Representative hook	Source class	Interpretation / threshold
PUE / WUE / grid / IT / facility	`kpiPue`, `kpiWue`, `kpiCarbon`, `kpiIt`, `sTotalLoad`	Locked or derived from `CONV_CALC.snapshot`.	Stable on reload; PUE warns above 1.5.
CHWS / CHWR / environment / fuel	`sChwSup`, `sChwRet`, `sTempAvg`, `sRhAvg`, `sFuelMain`	Locked BOD/simulated aggregate.	Temperature warns outside 18–27°C and critical above 32°C; RH warns outside 20–80%; fuel warns below 24 h and critical below 12 h autonomy.
Maintenance / bypass	`as-maint`	Derived as 10 installed − 7 running chillers.	Current value 3 includes capacity headroom; it is not proof of three maintenance events.
Comms / stale	`as-comms`, `as-stale`	Model-integrity check.	Comms OK means a versioned local snapshot exists; stale 0 means the frozen scenario has no acquisition-age concept.
Last Update	`as-update`	Browser clock.	Display time, not field sample time.
UPS A/B	`sUpsA`, `sUpsB`	Derived from two 40,000 kW-rated systems, 32 × 1,250 kW modules/system.	15,000 kW/system normal (37.5%); 30,000 kW failover (75%); nameplates remain assumed pending approved schedule.
Chillers	Chillers row / shared basis drawer	7/10 derived from current 31,250 kW evaporator duty, 5,000 kW_th/unit and central N+1.	Per-hall allocation remains unavailable until the hydronic distribution design exists.
Network / topology / uptime	Network, UPS Topology, Uptime rows	UNAVAILABLE.	No dedicated network/topology authority or authenticated downtime event log is bound on the overview.
Environment DP	Differential Pressure row	UNAVAILABLE.	No pressure-sensor source, timestamp or alarm threshold is currently bound.
FACP / VESDA	Safety rows	UNAVAILABLE.	The overview has no bound fire-panel authority; the dedicated Fire cockpit owns validated fire state.
Day tank	Day Tank row	UNAVAILABLE.	Bulk-tank 85%/48 h arithmetic does not validate a separate per-genset buffer value.
Data Quality / Scenario	`as-dq`, `as-scn`	Snapshot metadata.	GOOD describes internal model availability; Simulated is the governing provenance.
EPMS final rack path	`w_ats_rack_*`	Modeled topology state in `EPMS_Telemetry.html`.	The conductor inherits its actual energizing source; red/green never replaces source and energized-state text.
Four-hall design-point appendix	Design Studio current-plus-study	Governed planning-study envelope paired with the adopted operating snapshot.	4 × 10 MW = 40 MW IT and 58 MW facility are the design-point study; current remains 4 × 7.5 MW = 30 MW IT.

Alarm sequence: critical count has priority over warning. The current model does not implement acknowledgement, shelving, suppression, cause/effect or an event historian. A future field implementation should follow the ISA-18 series and IEC 62682:2022, with point-level freshness and quality. These references define direction and terminology, not current conformance.

11 Glossary & RZExplain

Marked terms are discoverable through the shared RZExplain scanner. Definitions below use the exact denominator and scope implemented by this cockpit.

Term	Cockpit meaning	Common misread
PUE	Facility power / IT power = 43,500 / 30,000 = 1.45.	Target efficiency or cooling-only ratio.
WUE	Annual cooling makeup water litres / annual IT kWh = 1.20 L/kWh.	All site water or instantaneous tower flow.
CUE	Carbon per IT energy = grid factor × PUE = 0.609 kgCO₂/kWh IT.	The raw 0.42 facility-kWh grid factor.
CHWS / CHWR	Warm-water chilled-water supply/return at 19.4/27.0°C.	The separate 32.0/37.0°C condenser-water loop.
EPMS	Electrical Power Monitoring System; route from the subsystem rail.	A control authorization or protection study.
BMS	Building Management System context for cooling/environment/safety integration.	A live field connection in this page.
2N	Two independent UPS paths, each able to carry the protected load.	Two modules whose combined capacity alone meets load.
Facility load	All site input power inside the PUE boundary.	IT output alone.
Non-IT load	Facility − IT = cooling, losses and auxiliary demand.	Only chiller compressor power.
Locked / derived / placeholder	Immutable assumption / formula output / value awaiting authoritative history or sensor source.	Equivalent forms of live telemetry.