2026-07-18 04:41:23 +02:00
<!DOCTYPE html>
< html lang = "en" >
< head >
< meta charset = "UTF-8" >
< meta name = "viewport" content = "width=device-width, initial-scale=1.0" >
< title > Winter Propane Calculator | Barbara Cintron< / title >
2026-07-21 12:36:26 +02:00
< meta property = "og:type" content = "website" >
< meta property = "og:title" content = "Winter Propane Calculator | Barbara Cintron" >
< meta property = "og:description" content = "WINTER PROPANE CALCULATOR STORM LAKE OPERATIONS • BUENA VISTA COUNTY WINTERIZATION WHY THIS EXISTS: In January 1994, forty-three households in Storm Lake…" >
< meta property = "og:url" content = "https://barbara-cintron.4ort.net/winter-propane.html" >
< meta name = "twitter:card" content = "summary" >
< meta name = "description" content = "WINTER PROPANE CALCULATOR STORM LAKE OPERATIONS • BUENA VISTA COUNTY WINTERIZATION WHY THIS EXISTS: In January 1994, forty-three households in Storm Lake…" >
2026-07-18 04:41:23 +02:00
< style >
:root {
--midnight: #0c0f1a;
--plowsteel: #2d3a4f;
--wheatgold: #f4e8c8;
--loam: #8b7355;
--frostline: #e8f4ff;
--danger: #ff6b6b;
--safe: #4ade80;
}
html, body {
background: var(--midnight);
color: var(--frostline);
font-family: 'JetBrains Mono', 'IBM Plex Mono', monospace;
margin: 0;
padding: 2em;
line-height: 1.6;
}
header {
border-bottom: 2px solid var(--wheatgold);
padding-bottom: 1.5em;
margin-bottom: 2em;
}
h1 {
font-size: 1.8rem;
letter-spacing: 0.1em;
color: var(--wheatgold);
margin-bottom: 0.5em;
}
.subtitle {
color: var(--loam);
font-size: 0.9rem;
letter-spacing: 0.05em;
}
.calculator {
border: 1px solid var(--plowsteel);
padding: 2em;
background: rgba(45, 58, 79, 0.3);
max-width: 56ch;
}
.input-group {
margin: 1.5em 0;
}
label {
display: block;
color: var(--wheatgold);
margin-bottom: 0.5em;
font-size: 0.85rem;
letter-spacing: 0.05em;
}
input[type="number"], select {
width: 100%;
background: var(--midnight);
border: 1px solid var(--loam);
color: var(--frostline);
padding: 0.75em;
font-family: inherit;
font-size: 1rem;
box-sizing: border-box;
}
input:focus, select:focus {
outline: none;
border-color: var(--wheatgold);
}
button {
background: var(--loam);
color: var(--midnight);
border: none;
padding: 1em 2em;
font-family: inherit;
font-weight: bold;
cursor: pointer;
margin-top: 1em;
transition: all 0.3s ease;
}
button:hover {
background: var(--wheatgold);
}
.result {
margin-top: 2em;
padding: 1.5em;
border-left: 4px solid var(--wheatgold);
background: rgba(139, 115, 85, 0.1);
display: none;
}
.result.active {
display: block;
}
.result h3 {
color: var(--wheatgold);
margin-top: 0;
}
.metric {
font-size: 1.25rem;
color: var(--frostline);
margin: 0.5em 0;
}
.warning {
color: var(--danger);
font-weight: bold;
}
.safe {
color: var(--safe);
font-weight: bold;
}
.data-link {
color: var(--loam);
font-size: 0.8rem;
margin-top: 2em;
display: block;
}
.context {
margin: 2em 0;
font-size: 0.9rem;
color: var(--loam);
border-left: 2px solid var(--plowsteel);
padding-left: 1.5em;
}
< / style >
2026-07-21 12:36:26 +02:00
< script defer src = "https://analytics.4ort.xyz/script.js" data-website-id = "d3ed927c-888a-4a6c-ae5f-0b1c613ddf5b" > < / script >
2026-07-18 04:41:23 +02:00
< / head >
< body >
< header >
< h1 > WINTER PROPANE CALCULATOR< / h1 >
< div class = "subtitle" > STORM LAKE OPERATIONS • BUENA VISTA COUNTY WINTERIZATION< / div >
< / header >
< section class = "context" >
< 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).
< / section >
< main class = "calculator" >
< form id = "propaneCalc" >
< div class = "input-group" >
< label > OUTDOER TEMPERATURE (°F)< / label >
< input type = "number" id = "outdoorTemp" value = "-25" min = "-50" max = "32" step = "1" >
< small style = "color:var(--loam)" > Typical Storm Lake low: -25°F to -30°F< / small >
< / div >
< div class = "input-group" >
< label > INDOOR SETPOINT (°F)< / label >
< input type = "number" id = "indoorSetpoint" value = "68" min = "60" max = "75" step = "1" >
< / div >
< div class = "input-group" >
< label > HOUSE ENVELOPE INTEGRITY< / label >
< select id = "envelopeFactor" >
< option value = "0.65" > Poor (pre-1970s, minimal insulation)< / option >
< option value = "0.85" selected > Average (1970s-1990s ranch)< / option >
< option value = "0.95" > Excellent (post-2000, sealed)< / option >
< / select >
< / div >
< div class = "input-group" >
< label > EVENT DURATION (hours)< / label >
< input type = "number" id = "eventDuration" value = "72" min = "12" max = "168" step = "6" >
< small style = "color:var(--loam)" > Major blizzard: 72 hours minimum< / small >
< / div >
< button type = "button" onclick = "calculate()" > CALCULATE SURVIVAL REQUIREMENT< / button >
< / form >
< div id = "results" class = "result" >
< h3 > CALCULATION COMPLETE< / h3 >
< div class = "metric" > Required reserve: < span id = "gallonsNeeded" > < / span > gallons< / div >
< div class = "metric" > Current tank status: < span id = "tankStatus" > < / span > < / div >
< div id = "recommendation" > < / div >
< / div >
< / main >
< footer >
< a href = "winter-propane.json" class = "data-link" > Download raw data (JSON) • Machine-readable constants and coefficients< / a >
< a href = "/" class = "data-link" style = "margin-left: 2em;" > ← Return to operations hub< / a >
< / footer >
< script >
// Constants from winter-propane.json
const BASE_TEMP_F = 65;
const PROANE_ENERGY_BTU_PER_GALLON = 91500;
const HOUSE_HEATING_LOAD_BASE_BTU_PER_HOUR = 45000; // Typical 1800 sq ft ranch
function calculate() {
const outdoorTemp = parseFloat(document.getElementById('outdoorTemp').value);
const indoorSetpoint = parseFloat(document.getElementById('indoorSetpoint').value);
const envelopeFactor = parseFloat(document.getElementById('envelopeFactor').value);
const eventDurationHours = parseFloat(document.getElementById('eventDuration').value);
// Delta-T drives consumption
const deltaT = indoorSetpoint - outdoorTemp;
// Baseline consumption at 65°F delta (standard moderate load)
const baselineDeltaT = 65 - 20; // 45°F differential
const baselineConsumptionGalPerDay = 2.8;
// Scale consumption by actual delta-T ratio
const scaledConsumptionGalPerHour = (baselineConsumptionGalPerDay / 24) * (deltaT / baselineDeltaT);
// Apply envelope efficiency (poorer envelope = more consumption)
const adjustedConsumptionGalPerHour = scaledConsumptionGalPerHour / envelopeFactor;
// Total gallons for event duration
const totalGallonsNeeded = adjustedConsumptionGalPerHour * eventDurationHours;
// Safety margin: always recommend 20% buffer
const recommendedReserve = totalGallonsNeeded * 1.2;
// Display results
document.getElementById('gallonsNeeded').textContent = Math.round(recommendedReserve);
// Tank status simulation (assume user reports 50% full 100-gallon tank = 50 gallons)
const assumedTankCapacity = 100;
const assumedCurrentFillPercent = 50;
const currentGallons = assumedTankCapacity * (assumedCurrentFillPercent / 100);
const tankStatusElem = document.getElementById('tankStatus');
const recommendationElem = document.getElementById('recommendation');
if (currentGallons >= recommendedReserve) {
tankStatusElem.innerHTML = `< span class = "safe" > ${currentGallons.toFixed(1)} gallons (SAFE)< / span > `;
recommendationElem.innerHTML = `< span class = "safe" > Your reserve exceeds requirement. Seal windows, bank heat in south rooms.< / span > `;
} else {
const shortfall = Math.round(recommendedReserve - currentGallons);
tankStatusElem.innerHTML = `< span class = "warning" > ${currentGallons.toFixed(1)} gallons (DEFICIENT)< / span > `;
recommendationElem.innerHTML = `< span class = "warning" > SHORTFALL: ${shortfall} gallons required before storm hits. Call distributor NOW—delivery windows close at first snow.< / span > `;
}
document.getElementById('results').classList.add('active');
}
< / script >
< / body >
< / html >
