{ "evidenceVersion": "internal-worked-cases-2026-09-22-v1", "evidenceClass": "internal-reproducible-equation-check", "independentProfessionalReview": "not-completed", "toleranceBasis": "Absolute numerical-agreement tolerance only; not physical accuracy, field validation or project acceptance.", "inputBasis": "Synthetic fixed inputs; no live weather, customer data, manufacturer certification or equipment recommendation.", "sourceHashes": { "scripts/methodology-evidence/cases.ts": "e9dbf5788e29cae39d4c970b6adc90312022e1237a02a09a80f21c01e02fa511", "scripts/methodology-evidence/fixtures.ts": "fcbe0d0cf6e00b6294ee3477b8228bf04ce107480f074e8f2295ded297cc6485", "scripts/methodology-evidence/reference.ts": "bdc66c1e28a201d168e5611bf446ed47d2b185fbb478ae9033d7efa72ad32f50", "src/lib/calc/constants.ts": "7a38008e9d7ea49b9fefbed44794d2800c3ebb0f9d648031d294e2ddbfafbf20", "src/lib/calc/engine.ts": "1c97945da4637f7f8bcbdf284dba7d4dd91dac96890fccbdee1159abd1428123", "src/lib/calc/index.ts": 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"L": 10, "W": 5, "D": 1.5, "theta1_h": 48, "theta1_c": 48, "T1_h": 28, "T2_h": 15, "T1_c": 24, "T2_c": 32, "poolCoverDuringHeatup": "NO", "activityFactor": "Public, schools - 1", "pipeLength": 15, "pipeConfig": "Uninsulated PVC, outdoor exposed (wind)", "customPipeU": 0, "T_indoor": 30, "RH_indoor": 0.6, "ventilationMode": "CIBSE/ASHRAE 62.1 (fixed L/s/m²)", "ventRate": 0.72, "deckFactor": 1.5, "hrvEfficiency": 0, "T_amb_avg": 10, "T_amb_h": 5, "T_amb_c": 35, "windOutdoor": 2, "windOutdoor_h": 1.227, "windOutdoor_c": 1.538, "RH_winter": 0.6, "RH_summer": 0.6, "elevation": 0, "I_solar": 0, "I_solar_h": 0, "I_solar_c": 0, "alpha_water": 0.85, "solarApplies": "NO", "includeSolarInHeatingSizing": false }, "status": "internal-equation-agreement", "reference": "separate-internal-outdoor-arithmetic", "checks": [ { "metric": "Q1", "unit": "kW", "expected": 23.538027468462715, "actual": 23.538027468462715, "difference": 0, "absoluteTolerance": 0.001, "withinTolerance": true }, { "metric": "Q2", 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"T_amb_c": 35, "windOutdoor": 2, "windOutdoor_h": 1.227, "windOutdoor_c": 1.538, "RH_winter": 0.6, "RH_summer": 0.6, "elevation": 0, "I_solar": 0, "I_solar_h": 0, "I_solar_c": 0, "alpha_water": 0.85, "solarApplies": "NO", "includeSolarInHeatingSizing": false }, "status": "internal-equation-agreement", "reference": "separate-internal-indoor-arithmetic", "checks": [ { "metric": "Q1", "unit": "kW", "expected": 23.538027468462715, "actual": 23.538027468462715, "difference": 0, "absoluteTolerance": 0.001, "withinTolerance": true }, { "metric": "Q2", "unit": "kW", "expected": -0.05691369826038976, "actual": -0.05691369826038976, "difference": 0, "absoluteTolerance": 0.001, "withinTolerance": true }, { "metric": "Q3", "unit": "kW", "expected": 5.031143529006642, "actual": 5.031143529006642, "difference": 0, "absoluteTolerance": 0.001, "withinTolerance": true }, { "metric": "Q4", "unit": "kW", "expected": -0.108375, "actual": -0.108375, "difference": 0, "absoluteTolerance": 0.001, 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"method": "hazen-williams-fixed-duty-internal-v1", "input": { "designFlowM3h": 171.4, "skimmerType": "skimmer", "pumpArrangement": "flooded", "backwashType": "multiport", "filterMedia": "high_rate_sand", "balanceTankLiftM": 0, "pumpHeightVsWaterM": 1, "waterTempC": 28, "atmosphericKpa": 101.3, "filterAreaM2": 4, "filterCleanKpa": 30, "filterDirtyKpa": 70, "suction": { "material": "pvc", "boreMm": 200, "lengthM": 8 }, "discharge": { "material": "pvc", "boreMm": 160, "lengthM": 15 }, "strainerKpa": 10, "skimmerKpa": 5, "nozzleKpa": 15, "fittings": [ { "type": "90_elbow", "suctionCount": 2, "dischargeCount": 3 }, { "type": "tee_run", "suctionCount": 0, "dischargeCount": 1 }, { "type": "gate_valve", "suctionCount": 1, "dischargeCount": 1 }, { "type": "check_valve", "suctionCount": 0, "dischargeCount": 1 }, { "type": "entrance_sharp", "suctionCount": 1, "dischargeCount": 0 }, { "type": "exit", "suctionCount": 0, "dischargeCount": 1 } ], "equipment": [ { "name": "Heat exchanger", "dpKpa": 25 }, { "name": "UV", "dpKpa": 15 }, { "name": "Flow meter", "dpKpa": 5 } ], "pump": { "headAtDesignM": 20, "npshrM": 3 }, "npshMarginM": 0.6, "headMarginPct": 10 }, "status": "internal-equation-agreement", "reference": "separate-internal-hydraulic-arithmetic", "checks": [ { "metric": "suctionVelocityMs", "unit": "m/s", "expected": 1.5155087358861588, "actual": 1.5155087358861588, "difference": 0, "absoluteTolerance": 0.001, "withinTolerance": true }, { "metric": "dischargeVelocityMs", "unit": "m/s", "expected": 2.3679823998221234, "actual": 2.367982399822123, "difference": -4.440892098500626e-16, "absoluteTolerance": 0.001, "withinTolerance": true }, { "metric": "suctionLossM", "unit": "m", "expected": 1.896636749583302, "actual": 1.8966367495833025, "difference": 4.440892098500626e-16, "absoluteTolerance": 0.001, "withinTolerance": true }, { "metric": "dischargeLossM", "unit": "m", "expected": 3.7892865877816595, "actual": 3.7892865877816595, "difference": 0, "absoluteTolerance": 0.001, "withinTolerance": true }, { "metric": "tdhCleanM", "unit": "m", "expected": 13.346504438404962, "actual": 13.34650443840496, "difference": -1.7763568394002505e-15, "absoluteTolerance": 0.001, "withinTolerance": true }, { "metric": "tdhDirtyM", "unit": "m", "expected": 17.43214769229296, "actual": 17.43214769229296, "difference": 0, "absoluteTolerance": 0.001, "withinTolerance": true }, { "metric": "headRequiredM", "unit": "m", "expected": 19.17536246152226, "actual": 19.17536246152226, "difference": 0, "absoluteTolerance": 0.001, "withinTolerance": true }, { "metric": "npshaM", "unit": "m", "expected": 9.064181258075923, "actual": 9.064181258075923, "difference": 0, "absoluteTolerance": 0.001, "withinTolerance": true }, { "metric": "npshMarginActualM", "unit": "m", "expected": 6.064181258075923, "actual": 6.064181258075923, "difference": 0, "absoluteTolerance": 0.001, "withinTolerance": true }, { "metric": "backwashFlowM3h", "unit": "m³/h", "expected": 148, "actual": 148, "difference": 0, "absoluteTolerance": 0.001, "withinTolerance": true }, { "metric": "governingFlowM3h", "unit": "m³/h", "expected": 171.4, "actual": 171.4, "difference": 0, "absoluteTolerance": 0.001, "withinTolerance": true } ], "expectedAssurance": "INDETERMINATE", "actualAssurance": "INDETERMINATE" } ] }