Add recirculation pump node with input handling and flow management

additional_nodes/recirculation-pump.html

@@ -0,0 +1,57 @@
+<script type="text/javascript">
+    RED.nodes.registerType("recirculation-pump", {
+        category: "WWTP",
+        color: "#e4a363",
+        defaults: {
+            name: { value: "" },
+            F2: { value: 0, required: true },
+            inlet: { value: 1, required: true }
+        },
+        inputs: 1,
+        outputs: 2,
+        outputLabels: ["Main effluent", "Recirculation effluent"],
+        icon: "font-awesome/fa-random",
+        label: function() {
+            return this.name || "Recirculation pump";
+        },
+        oneditprepare: function() {
+            $("#node-input-F2").typedInput({
+                type:"num",
+                types:["num"]
+            });
+            $("#node-input-inlet").typedInput({
+                type:"num",
+                types:["num"]
+            });
+        },
+        oneditsave: function() {
+            let debit = parseFloat($("#node-input-F2").typedInput("value"));
+            if (isNaN(volume) || debit < 0) {
+                RED.notify("Debit is not set correctly", {type: "error"});
+            }
+            let inlet = parseInt($("#node-input-n_inlets").typedInput("value"));
+            if (isNaN(inlet) || inlet < 1) {
+                RED.notify("Number of inlets not set correctly", {type: "error"});
+            }
+        }
+    });
+</script>
+
+<script type="text/html" data-template-name="recirculation-pump">
+    <div class="form-row">
+        <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
+        <input type="text" id="node-input-name" placeholder="Name">
+    </div>
+    <div class="form-row">
+        <label for="node-input-F2"><i class="fa fa-tag"></i> Recirculation debit [m3 s-1]</label>
+        <input type="text" id="node-input-F2" placeholder="m3 s-1">
+    </div>
+    <div class="form-row">
+        <label for="node-input-inlet"><i class="fa fa-tag"></i> Assigned inlet recirculation</label>
+        <input type="text" id="node-input-inlet" placeholder="#">
+    </div>
+</script>
+
+<script type="text/html" data-help-name="recirculation-pump">
+    <p>Recirculation-pump for splitting streams</p>
+</script>

additional_nodes/recirculation-pump.js

@@ -0,0 +1,38 @@
+module.exports = function(RED) {
+    function recirculation(config) {
+        RED.nodes.createNode(this, config);
+        var node = this;
+
+        let name = config.name;
+        let F2 = parseFloat(config.F2);
+        let inlet = parseInt(config.inlet);
+
+        node.on('input', function(msg, send, done) {
+            switch (msg.topic) {
+                case "Fluent":
+                    // conserve volume flow debit
+                    let F1 = msg.payload.F;
+                    let F_diff = Math.max(F1 - F2, 0);
+                    let F2_corr = F1 < F2 ? F1 : F2;
+
+                    let msg_F1 = structuredClone(msg);
+                    msg_F1.payload.F = F_diff;
+
+                    let msg_F2 = structuredClone(msg);
+                    msg_F2.payload.F = F2_corr;
+                    msg_F2.payload.inlet = inlet;
+
+                    send([msg_F1, msg_F2]);
+                    break;
+                default:
+                    console.log("Unknown topic: " + msg.topic);
+            }
+
+            if (done) {
+                done();
+            }
+        });
+
+    }
+    RED.nodes.registerType("recirculation-pump", recirculation);
+};