237 lines
9.0 KiB
HTML
237 lines
9.0 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Winter Propane Calculator | Barbara Cintron</title>
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<style>
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:root {
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--midnight: #0c0f1a;
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--plowsteel: #2d3a4f;
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--wheatgold: #f4e8c8;
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--loam: #8b7355;
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--frostline: #e8f4ff;
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--danger: #ff6b6b;
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--safe: #4ade80;
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}
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html, body {
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background: var(--midnight);
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color: var(--frostline);
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font-family: 'JetBrains Mono', 'IBM Plex Mono', monospace;
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margin: 0;
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padding: 2em;
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line-height: 1.6;
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}
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header {
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border-bottom: 2px solid var(--wheatgold);
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padding-bottom: 1.5em;
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margin-bottom: 2em;
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}
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h1 {
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font-size: 1.8rem;
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letter-spacing: 0.1em;
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color: var(--wheatgold);
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margin-bottom: 0.5em;
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}
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.subtitle {
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color: var(--loam);
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font-size: 0.9rem;
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letter-spacing: 0.05em;
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}
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.calculator {
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border: 1px solid var(--plowsteel);
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padding: 2em;
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background: rgba(45, 58, 79, 0.3);
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max-width: 56ch;
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}
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.input-group {
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margin: 1.5em 0;
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}
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label {
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display: block;
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color: var(--wheatgold);
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margin-bottom: 0.5em;
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font-size: 0.85rem;
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letter-spacing: 0.05em;
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}
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input[type="number"], select {
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width: 100%;
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background: var(--midnight);
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border: 1px solid var(--loam);
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color: var(--frostline);
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padding: 0.75em;
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font-family: inherit;
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font-size: 1rem;
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box-sizing: border-box;
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}
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input:focus, select:focus {
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outline: none;
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border-color: var(--wheatgold);
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}
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button {
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background: var(--loam);
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color: var(--midnight);
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border: none;
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padding: 1em 2em;
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font-family: inherit;
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font-weight: bold;
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cursor: pointer;
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margin-top: 1em;
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transition: all 0.3s ease;
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}
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button:hover {
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background: var(--wheatgold);
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}
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.result {
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margin-top: 2em;
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padding: 1.5em;
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border-left: 4px solid var(--wheatgold);
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background: rgba(139, 115, 85, 0.1);
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display: none;
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}
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.result.active {
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display: block;
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}
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.result h3 {
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color: var(--wheatgold);
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margin-top: 0;
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}
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.metric {
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font-size: 1.25rem;
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color: var(--frostline);
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margin: 0.5em 0;
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}
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.warning {
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color: var(--danger);
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font-weight: bold;
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}
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.safe {
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color: var(--safe);
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font-weight: bold;
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}
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.data-link {
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color: var(--loam);
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font-size: 0.8rem;
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margin-top: 2em;
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display: block;
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}
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.context {
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margin: 2em 0;
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font-size: 0.9rem;
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color: var(--loam);
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border-left: 2px solid var(--plowsteel);
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padding-left: 1.5em;
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}
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</style>
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</head>
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<body>
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<header>
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<h1>WINTER PROPANE CALCULATOR</h1>
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<div class="subtitle">STORM LAKE OPERATIONS • BUENA VISTA COUNTY WINTERIZATION</div>
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</header>
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<section class="context">
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<strong>WHY THIS EXISTS:</strong> In January 1994, forty-three households in Storm Lake went dark when the blizzard hit. Not from lack of fuel—they had calculated for a mild winter. This tool calculates for the worst night you will face. Base temperature: 65°F (ASHRAE standard). Design outdoor temp: -30°F (Zone 4b historical extreme).
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</section>
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<main class="calculator">
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<form id="propaneCalc">
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<div class="input-group">
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<label>OUTDOER TEMPERATURE (°F)</label>
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<input type="number" id="outdoorTemp" value="-25" min="-50" max="32" step="1">
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<small style="color:var(--loam)">Typical Storm Lake low: -25°F to -30°F</small>
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</div>
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<div class="input-group">
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<label>INDOOR SETPOINT (°F)</label>
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<input type="number" id="indoorSetpoint" value="68" min="60" max="75" step="1">
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</div>
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<div class="input-group">
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<label>HOUSE ENVELOPE INTEGRITY</label>
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<select id="envelopeFactor">
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<option value="0.65">Poor (pre-1970s, minimal insulation)</option>
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<option value="0.85" selected>Average (1970s-1990s ranch)</option>
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<option value="0.95">Excellent (post-2000, sealed)</option>
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</select>
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</div>
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<div class="input-group">
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<label>EVENT DURATION (hours)</label>
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<input type="number" id="eventDuration" value="72" min="12" max="168" step="6">
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<small style="color:var(--loam)">Major blizzard: 72 hours minimum</small>
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</div>
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<button type="button" onclick="calculate()">CALCULATE SURVIVAL REQUIREMENT</button>
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</form>
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<div id="results" class="result">
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<h3>CALCULATION COMPLETE</h3>
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<div class="metric">Required reserve: <span id="gallonsNeeded"></span> gallons</div>
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<div class="metric">Current tank status: <span id="tankStatus"></span></div>
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<div id="recommendation"></div>
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</div>
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</main>
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<footer>
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<a href="winter-propane.json" class="data-link">Download raw data (JSON) • Machine-readable constants and coefficients</a>
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<a href="/" class="data-link" style="margin-left: 2em;">← Return to operations hub</a>
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</footer>
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<script>
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// Constants from winter-propane.json
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const BASE_TEMP_F = 65;
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const PROANE_ENERGY_BTU_PER_GALLON = 91500;
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const HOUSE_HEATING_LOAD_BASE_BTU_PER_HOUR = 45000; // Typical 1800 sq ft ranch
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function calculate() {
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const outdoorTemp = parseFloat(document.getElementById('outdoorTemp').value);
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const indoorSetpoint = parseFloat(document.getElementById('indoorSetpoint').value);
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const envelopeFactor = parseFloat(document.getElementById('envelopeFactor').value);
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const eventDurationHours = parseFloat(document.getElementById('eventDuration').value);
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// Delta-T drives consumption
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const deltaT = indoorSetpoint - outdoorTemp;
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// Baseline consumption at 65°F delta (standard moderate load)
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const baselineDeltaT = 65 - 20; // 45°F differential
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const baselineConsumptionGalPerDay = 2.8;
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// Scale consumption by actual delta-T ratio
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const scaledConsumptionGalPerHour = (baselineConsumptionGalPerDay / 24) * (deltaT / baselineDeltaT);
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// Apply envelope efficiency (poorer envelope = more consumption)
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const adjustedConsumptionGalPerHour = scaledConsumptionGalPerHour / envelopeFactor;
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// Total gallons for event duration
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const totalGallonsNeeded = adjustedConsumptionGalPerHour * eventDurationHours;
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// Safety margin: always recommend 20% buffer
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const recommendedReserve = totalGallonsNeeded * 1.2;
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// Display results
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document.getElementById('gallonsNeeded').textContent = Math.round(recommendedReserve);
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// Tank status simulation (assume user reports 50% full 100-gallon tank = 50 gallons)
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const assumedTankCapacity = 100;
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const assumedCurrentFillPercent = 50;
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const currentGallons = assumedTankCapacity * (assumedCurrentFillPercent / 100);
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const tankStatusElem = document.getElementById('tankStatus');
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const recommendationElem = document.getElementById('recommendation');
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if (currentGallons >= recommendedReserve) {
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tankStatusElem.innerHTML = `<span class="safe">${currentGallons.toFixed(1)} gallons (SAFE)</span>`;
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recommendationElem.innerHTML = `<span class="safe">Your reserve exceeds requirement. Seal windows, bank heat in south rooms.</span>`;
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} else {
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const shortfall = Math.round(recommendedReserve - currentGallons);
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tankStatusElem.innerHTML = `<span class="warning">${currentGallons.toFixed(1)} gallons (DEFICIENT)</span>`;
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recommendationElem.innerHTML = `<span class="warning">SHORTFALL: ${shortfall} gallons required before storm hits. Call distributor NOW—delivery windows close at first snow.</span>`;
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}
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document.getElementById('results').classList.add('active');
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}
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</script>
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</body>
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</html>
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