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🏠 建筑热损失Heat Loss Calculator
Q = U × A × ΔT（W）：U 为传热系数 W/(m²·K)，A 面积，ΔT 室内外温差；并估算每天耗能。本地处理。Q = U × A × ΔT (W): U-value W/(m²·K), area A and indoor-outdoor temperature difference; plus daily energy. Processed locally.
使用说明与常见问题How-to & FAQ
「建筑热损失」是什么？What is the Heat Loss Calculator tool?
Q = U × A × ΔT（W）：U 为传热系数 W/(m²·K)，A 面积，ΔT 室内外温差；并估算每天耗能。本地处理。Q = U × A × ΔT (W): U-value W/(m²·K), area A and indoor-outdoor temperature difference; plus daily energy. Processed locally.
如何使用「建筑热损失」？How do I use the Heat Loss Calculator tool?
填写 U 值、面积以及室内和室外温度，即可得到热损失 Q = U × A × ΔT（瓦）以及每天的能耗。结果会随输入实时更新。Enter the U-value, the area and the indoor and outdoor temperatures to get the heat loss Q = U × A × ΔT in watts, plus the energy per day. The result updates as you type.
典型 U 值？Typical U-values?
单层玻璃约 5.8，双层约 2.8，节能窗约 1.2，保温墙体 0.2-0.4。Single glazing ≈ 5.8, double ≈ 2.8, low-E ≈ 1.2, insulated walls 0.2-0.4.
能举个计算实例吗？Can you show a worked example?
例如在「建筑热损失」中填 U 值 W/(m²·K) = 2.5，面积 m² = 20，室内温度 °C = 21，室外温度 °C = -4，结果区显示：温差：25 K；热损失功率：1,250 W；每天耗能：30 kWhFor example, entering U-value W/(m²·K) = 2.5, Area m² = 20, Indoor temperature °C = 21, Outdoor temperature °C = -4 in the Heat Loss Calculator gives: Temperature difference: 25 K; Heat loss: 1,250 W; Energy per day: 30 kWh
哪些输入会被检查？Which inputs are validated?
「建筑热损失」会检查这些输入——「U 值 W/(m²·K)」、「面积 m²」：必须填写，须大于 0；「室内温度 °C」：必须填写；「室外温度 °C」：可留空；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Heat Loss Calculator checks its inputs — "U-value W/(m²·K)", "Area m²": required, must be greater than 0; "Indoor temperature °C": required; "Outdoor temperature °C": optional; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.
有哪些选项可以调整？What options can I adjust?
「建筑热损失」的设置：「U 值 W/(m²·K)」默认 2.5；「面积 m²」默认 20；「室内温度 °C」默认 21；「室外温度 °C」默认 -4。每次生成结果都按当前设置处理。Settings in the Heat Loss Calculator — "U-value W/(m²·K)" default 2.5; "Area m²" default 20; "Indoor temperature °C" default 21; "Outdoor temperature °C" default -4. The result always uses the current settings.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「建筑热损失」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Heat Loss Calculator uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.
「建筑热损失」免费吗？需要注册吗？Is the Heat Loss Calculator free? Do I need an account?
「建筑热损失」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Heat Loss Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.