@strato-automation/node-red-contrib-strato-automation/psychrometric-calculator-node/psychrometric-calculator.html

Strato Automation Official Node Red Library

<script type="text/javascript">
    RED.nodes.registerType('psychrometric-calculator', {
        category: 'Strato Automation',
        color: '#f3b567',
        defaults: {
            name: { value: "", label: "name" },
            option: { value: "Imperial", required: true, label: "option" },
            initialized: { value: false }
        },
        inputs: 1,
        outputs: 5,
        icon: "font-awesome/fa-thermometer-quarter",
        paletteLabel: function () {
            return "Psychrometric Calculator";
        },
        label: function () {
            return "Psychrometric Calculator: " + this.option
        },
        labelStyle: function () {
            return this.name ? "node_label_italic" : "";
        },
        outputLabels: function (index) {
            const outLabels = [
                "Dew Point",
                "Enthalpy",
                "Saturation Pressure",
                "Vapor Pressure",
                "Wet Bulb Temperature"
            ]
            return outLabels[index];
        },
        inputLabels: function (index) {
            return "Input 1: Temperature\nInput 2: Humidity";
        },
        oneditprepare: function () {
            var node = this;
            $("#node-input-option").typedInput({
                types: [
                    {
                        value: "",
                        options: [ {value: "Metric", label: "Metric"}, {value: "Imperial", label: "Imperial"} ]
                    }
                ]
            })
        }
    });
    RED.events.on("nodes:add", function (node) {
        if (node.type == "psychrometric-calculator" && !node.initialized) {
            // Get node
            var node = RED.nodes.node(node.id);
            // Timeout to make sure the node is initialized and ready
            setTimeout(() => {
                in1_node = addNode(RED, node, {
                    type: 'input-topic',
                    name: "Temperature",
                    topic: "in1"
                }, -300, -40)

                in2_node = addNode(RED, node, {
                    type: 'input-topic',
                    name: "Humidity",
                    topic: "in2"
                }, -300, 40)
                groupNodes([node, in1_node, in2_node])
            }, 200);
            node.initialized = true;

        }
    });
</script>

<script type="text/html" data-template-name="psychrometric-calculator">
    <!-- Basic Settings -->
    <div class="form-tips" style="margin-bottom: 20px;">
        <b>Basic Settings</b>
    </div>
    <div class="form-row">
        <label for="node-input-name"><i class="fa fa-bookmark"></i> Name</label>
        <input type="text" id="node-input-name" placeholder="Optional name for this calculator">
    </div>
    <div class="form-row">
        <label for="node-input-option"><i class="fa fa-thermometer-half"></i> Units</label>
        <input type="text" id="node-input-option">
    </div>

    <div class="form-tips" style="margin-top: 20px;">
        <p><i class="fa fa-info-circle"></i> Tip: Input 1 expects temperature and Input 2 expects relative humidity percentage.</p>
    </div>
</script>

<script type="text/html" data-help-name="psychrometric-calculator">
    <p>A node that calculates various psychrometric properties based on temperature and relative humidity inputs.</p>

    <h3>Inputs</h3>
    <dl class="message-properties">
        <dt>Input 1 (Temperature) <span class="property-type">number</span></dt>
        <dd>
            Temperature value in selected units:
            <ul>
                <li>Metric: degrees Celsius (°C)</li>
                <li>Imperial: degrees Fahrenheit (°F)</li>
            </ul>
        </dd>
        
        <dt>Input 2 (Humidity) <span class="property-type">number</span></dt>
        <dd>Relative humidity percentage (0-100%)</dd>
    </dl>

    <h3>Outputs</h3>
    <ol class="node-ports">
        <li>Dew Point
            <dl class="message-properties">
                <dt>payload <span class="property-type">number</span></dt>
                <dd>Temperature at which water vapor begins to condense (°C or °F)</dd>
            </dl>
        </li>
        <li>Enthalpy
            <dl class="message-properties">
                <dt>payload <span class="property-type">number</span></dt>
                <dd>Total heat content of the air (kJ/kg or BTU/lb)</dd>
            </dl>
        </li>
        <li>Saturation Pressure
            <dl class="message-properties">
                <dt>payload <span class="property-type">number</span></dt>
                <dd>Vapor pressure at saturation (kPa or PSI)</dd>
            </dl>
        </li>
        <li>Vapor Pressure
            <dl class="message-properties">
                <dt>payload <span class="property-type">number</span></dt>
                <dd>Actual vapor pressure (kPa or PSI)</dd>
            </dl>
        </li>
        <li>Wet Bulb Temperature
            <dl class="message-properties">
                <dt>payload <span class="property-type">number</span></dt>
                <dd>Temperature indicated by a moistened thermometer (°C or °F)</dd>
            </dl>
        </li>
    </ol>

    <h3>Configuration</h3>
    <dl class="message-properties">
        <dt>Name <span class="property-type">string</span></dt>
        <dd>Optional name to identify the node in the flow</dd>
        
        <dt>Units <span class="property-type">string</span></dt>
        <dd>
            Select unit system:
            <ul>
                <li><code>Metric</code> - Uses °C, kPa, kJ/kg</li>
                <li><code>Imperial</code> - Uses °F, PSI, BTU/lb</li>
            </ul>
        </dd>
    </dl>

    <h3>Details</h3>
    <p>This node calculates psychrometric properties using standard ASHRAE formulas. The calculations include:</p>
    <ul>
        <li><b>Dew Point</b> - Temperature at which condensation begins</li>
        <li><b>Enthalpy</b> - Total heat content per unit mass of air</li>
        <li><b>Saturation Pressure</b> - Maximum possible vapor pressure at given temperature</li>
        <li><b>Vapor Pressure</b> - Actual partial pressure of water vapor</li>
        <li><b>Wet Bulb Temperature</b> - Temperature reading of a moistened thermometer</li>
    </ul>

    <h3>Status</h3>
    <dl class="message-properties">
        <dt>Grey dot</dt>
        <dd>All calculations completed successfully</dd>
        
        <dt>Yellow dot</dt>
        <dd>Waiting for both temperature and humidity inputs</dd>
    </dl>

    <h3>References</h3>
    <p>Calculations based on ASHRAE Handbook - Fundamentals (2021) Chapter 1 equations and Clausius-Clapeyron relationship.</p>
</script>