.. 標題：BTU 熱負荷計算器
.. slug：btu-熱負荷計算器
.. 日期: 2025-12-26 15:00:00 世界標準時間
..標籤：網路、計算機、工具
..類別：計算器
..連結：
.. 描述：根據 BTU 輸出計算房間熱負荷和溫升
..類型：文字
<style>
    .calc-container {
        max-width: 1000px;
        margin: 20px auto;
        padding: 20px;
    }

    .calc-header {
        margin-bottom: 30px;
        padding: 25px;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        border-radius: 12px;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        color: white;
    }

    .calc-header h2 {
        margin-top: 0;
        color: white;
        font-size: 28px;
        margin-bottom: 10px;
    }

    .calc-header p {
        margin: 10px 0;
        opacity: 0.95;
        font-size: 15px;
    }

    .input-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 15px;
        margin-top: 20px;
    }

    .input-group {
        display: flex;
        flex-direction: column;
    }

    .input-group label {
        margin-bottom: 8px;
        font-weight: 600;
        color: white;
        font-size: 14px;
    }

    .input-group input {
        padding: 12px;
        font-size: 16px;
        border: 2px solid rgba(255,255,255,0.3);
        border-radius: 6px;
        font-family: 'Courier New', monospace;
        background: rgba(255,255,255,0.95);
        transition: all 0.3s ease;
    }

    .input-group input:focus {
        outline: none;
        border-color: #4CAF50;
        background: white;
        box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
    }

    .button-container {
        margin-top: 20px;
        display: flex;
        gap: 10px;
    }

    .calc-button {
        padding: 14px 35px;
        font-size: 16px;
        background: #4CAF50;
        color: white;
        border: none;
        border-radius: 6px;
        cursor: pointer;
        font-weight: bold;
        transition: all 0.3s ease;
        box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    }

    .calc-button:hover {
        background: #45a049;
        transform: translateY(-1px);
        box-shadow: 0 4px 8px rgba(0,0,0,0.3);
    }

    .calc-button:active {
        background: #3d8b40;
        transform: translateY(0);
    }

    .help-text {
        margin-top: 15px;
        font-size: 14px;
        color: rgba(255,255,255,0.9);
        background: rgba(0,0,0,0.1);
        padding: 10px 15px;
        border-radius: 4px;
    }

    .help-text strong {
        color: white;
    }

    .results {
        margin-top: 30px;
        display: none;
    }

    .results.show {
        display: block;
    }

    .result-section {
        background: white;
        border: 1px solid #e0e0e0;
        border-radius: 8px;
        margin-bottom: 15px;
        overflow: hidden;
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        transition: all 0.3s ease;
    }

    .result-section:hover {
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
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    .section-header {
        background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
        color: white;
        padding: 15px 20px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        user-select: none;
    }

    .section-header h3 {
        margin: 0;
        font-size: 18px;
        display: flex;
        align-items: center;
        gap: 10px;
    }

    .section-header .icon {
        font-size: 20px;
    }

    .section-content {
        padding: 20px;
        background: #fafafa;
    }

    .data-row {
        display: flex;
        margin: 12px 0;
        padding: 10px;
        background: white;
        border-radius: 4px;
        border-left: 3px solid #4CAF50;
    }

    .data-label {
        font-weight: bold;
        color: #555;
        min-width: 220px;
        flex-shrink: 0;
    }

    .data-value {
        color: #333;
        font-family: 'Courier New', monospace;
        word-break: break-word;
    }

    .data-value.highlight {
        color: #4CAF50;
        font-weight: bold;
        font-size: 18px;
    }

    .info-box {
        background: #e3f2fd;
        color: #1565c0;
        padding: 15px 20px;
        border-radius: 8px;
        border-left: 4px solid #2196F3;
        margin: 20px 0;
        font-size: 14px;
    }

    .info-box strong {
        color: #0d47a1;
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    .warning {
        background: #fff3e0;
        color: #e65100;
        padding: 15px 20px;
        border-radius: 8px;
        border-left: 4px solid #ff9800;
        margin: 20px 0;
    }

    /* Responsive design */
    @media (max-width: 768px) {
        .input-grid {
            grid-template-columns: 1fr;
        }

        .button-container {
            flex-direction: column;
        }

        .calc-button {
            width: 100%;
        }

        .data-row {
            flex-direction: column;
        }

        .data-label {
            margin-bottom: 5px;
            min-width: auto;
        }
    }
</style>
<div class="calc-container">
<div class="calc-header">
<h2>BTU 熱負荷計算器</h2>
<p>根據設備、伺服器或 HVAC 系統的 BTU 輸出計算房間內的溫度升高。</p>
<div class="input-grid">
<div class="input-group">
<label for="width">房間寬度（英尺）：</label>
<input id="width" min="1" step="0.1" type="number" value="10"/>
</div>
<div class="input-group">
<label for="length">房間長度（英尺）：</label>
<input id="length" min="1" step="0.1" type="number" value="20"/>
</div>
<div class="input-group">
<label for="height">房間高度（英尺）：</label>
<input id="height" min="1" step="0.1" type="number" value="10"/>
</div>
<div class="input-group">
<label for="btuload">總 BTU 負載（BTU/小時）：</label>
<input id="btuload" min="0" step="100" type="number" value="20000"/>
</div>
</div>
<div class="button-container">
<button class="calc-button" onclick="btu()">計算</button>
</div>
<div class="help-text">
<strong>什麼是英熱單位？</strong>英國熱量單位 (BTU) 測量熱能。 1 BTU 是將一磅水升高 1°F 所需的能量。使用此計算器可以確定設備熱量輸出如何影響室溫。</div>
</div>
<div class="results" id="results">
<div class="result-section">
<div class="section-header">
<h3><span class="icon">📊</span>房間資訊</h3>
</div>
<div class="section-content">
<div class="data-row">
<div class="data-label">房間容積：</div>
<div class="data-value highlight" id="cubicFeet"></div>
</div>
</div>
</div>
<div class="result-section">
<div class="section-header">
<h3><span class="icon">🌡️</span>熱負荷分析</h3>
</div>
<div class="section-content">
<div class="data-row">
<div class="data-label">BTU 升高 1°F：</div>
<div class="data-value" id="tempRise"></div>
</div>
<div class="data-row">
<div class="data-label">溫度升高：</div>
<div class="data-value highlight" id="totalPotentialHeatIncrease"></div>
</div>
</div>
</div>
<div class="info-box">
<strong>重要提示：</strong><br/>• 此計算假設沒有通風或冷卻系統<br/>• 空氣密度：海平面的標準大氣條件<br/>• 空氣熱容量：每立方英尺每華氏度 0.24 BTU<br/>• 對於資料中心，確保足夠的冷卻以防止溫度升高<br/>• 持續的熱負荷將導致累積溫度升高而無需冷卻</div>
</div>
</div>
<script>
/**
 * BTU Heat Load Calculator
 * Calculates room temperature rise based on BTU heat output
 *
 * Formula:
 * - Room Volume (cubic feet) = Width × Length × Height
 * - BTU per 1°F = Volume × 0.24 (heat capacity of air)
 * - Temperature Rise (°F) = Total BTU Load / BTU per 1°F
 * - Temperature Rise (°C) = (°F - 32) × 0.5556
 */

function btu() {
    // Set variables from input
    var height = Number(document.getElementById("height").value);
    var width = Number(document.getElementById("width").value);
    var length = Number(document.getElementById("length").value);
    var btuload = Number(document.getElementById("btuload").value);

    // Validate inputs
    if (isNaN(height) || isNaN(width) || isNaN(length) || isNaN(btuload)) {
        alert("Please enter valid numbers for all fields.");
        return;
    }

    if (height <= 0 || width <= 0 || length <= 0) {
        alert("Room dimensions must be greater than zero.");
        return;
    }

    if (btuload < 0) {
        alert("BTU load cannot be negative.");
        return;
    }

    // Calculate room volume in cubic feet
    var cubicFeet = width * length * height;

    // Calculate BTU needed to raise temperature by 1°F
    // Air has a heat capacity of approximately 0.24 BTU per cubic foot per degree Fahrenheit
    var btuOneDegree = cubicFeet * 0.24;

    // Calculate temperature rise in Fahrenheit
    var tempChange = btuload / btuOneDegree;

    // Convert to Celsius
    // Note: This converts a temperature difference, not an absolute temperature
    // For temperature differences: ΔC = ΔF × (5/9) or ΔF × 0.5556
    var celtemp = tempChange * 0.5556;

    // Format and display results
    document.getElementById("cubicFeet").innerHTML = cubicFeet.toFixed(2) + " cubic feet";
    document.getElementById("tempRise").innerHTML = btuOneDegree.toFixed(2) + " BTU/hr per °F";
    document.getElementById("totalPotentialHeatIncrease").innerHTML =
        tempChange.toFixed(2) + " °F (" + celtemp.toFixed(2) + " °C)";

    // Show results section
    document.getElementById("results").classList.add("show");

    // Scroll to results
    document.getElementById("results").scrollIntoView({ behavior: 'smooth', block: 'start' });
}

// Add enter key support for all input fields
document.addEventListener('DOMContentLoaded', function() {
    console.log('BTU Heat Load Calculator v2.0 - Modern UI');

    const inputs = ['width', 'length', 'height', 'btuload'];
    inputs.forEach(function(id) {
        document.getElementById(id).addEventListener('keypress', function(e) {
            if (e.key === 'Enter') {
                btu();
            }
        });
    });

    // Auto-focus first input field
    document.getElementById('width').focus();
});
</script>