---
title: EVOLV Project Overview
created: 2026-04-07
updated: 2026-04-07
status: evolving
tags: [overview, wastewater, node-red, isa-88]
---

# EVOLV — Edge-Layer Evolution for Optimized Virtualization

Industrial automation platform for wastewater treatment, built as custom Node-RED nodes by Waterschap Brabantse Delta R&D. Follows ISA-88 (S88) batch control standard.

## Stack

Node.js, Node-RED, InfluxDB (time-series), TensorFlow.js (prediction), CoolProp (thermodynamics). No build step — pure Node.js.

## Architecture

Each node follows a 3-tier pattern:
1. **Entry file** — registers with Node-RED, admin HTTP endpoints
2. **nodeClass** — Node-RED adapter (tick loop, message routing, status)
3. **specificClass** — pure domain logic (physics, state machines, predictions)

3-port output convention: Port 0 = process data, Port 1 = InfluxDB telemetry, Port 2 = parent-child registration.

## What Works

| Capability | Status | Evidence |
|---|---|---|
| rotatingMachine state machine | proven | 76 tests passing, all sequences verified |
| 3D pump curve prediction (flow/power from pressure+control) | proven | Monotonic cubic spline interpolation across 34 pressure levels |
| NCog / BEP tracking per pump | proven | Produces meaningful values with differential pressure |
| machineGroupControl BEP-Gravitation | proven | Within 0.1% of brute-force global optimum |
| Combination selection (2^n exhaustive) | proven | Stable: 1-2 switches across 5-95% demand sweep, no hysteresis |
| Prediction health scoring | proven | NRMSE drift, pressure source penalties, edge detection |
| Hydraulic efficiency (η = QΔP/P) | proven | CoolProp density, head calculation |
| Unit conversion chain | proven | No double-conversion, clean layer separation |

## What Doesn't Work (honestly)

| Issue | Status | Evidence |
|---|---|---|
| C5 curve non-convexity | evolving | 5 raw data points cause spline artifacts, dP/dQ non-monotonic |
| NCog = 0 at high ΔP | evolving | At ΔP > 800 mbar for H05K, Q/P is monotonically decreasing |
| calcBestCombination (NCog-weight mode) | disproven | Uses NCog as proportional weight instead of BEP target |

## Current Scale

- 13 custom Node-RED nodes (12 submodules + generalFunctions)
- rotatingMachine: 76 tests, 1563 lines domain logic
- machineGroupControl: 90+ tests, 1400+ lines domain logic
- 3 real pump curves: H05K-S03R, C5-D03R-SHN1, ECDV
- Tick loop: 1000ms interval

## Node Inventory

| Node | Purpose | Test Status |
|------|---------|-------------|
| rotatingMachine | Pump/compressor control | 76 tests (full) |
| machineGroupControl | Multi-pump optimization | 90 tests (full) |
| pumpingStation | Multi-pump station | needs review |
| valve | Valve modeling | needs review |
| valveGroupControl | Valve group coordination | needs review |
| reactor | Biological reactor (ASM kinetics) | needs review |
| settler | Secondary clarifier | needs review |
| monster | Multi-parameter bio monitoring | needs review |
| measurement | Sensor signal conditioning | needs review |
| diffuser | Aeration system control | needs review |
| dashboardAPI | InfluxDB + FlowFuse charts | needs review |
| generalFunctions | Shared utilities | partial |