热回收投资回收计算

B在购买回热装置之前，先做一个快速的 投资回收期计算 即可判断是否划算。只需要几个现场数据和当地能源价格。

The Core Formula

年节能量 (kWh) = 1.2 × 风量 (m³/h) × η × dT (℃) × 小时/年 ÷ 1000

其中1.2为空气近似体积热容 (Wh/m³·K)，eta为效率，dT为排风与送风之间的温差。

Worked Example

• 风量：10,000 m³/h
• 效率：75 % (0.75)
• dT（冬季平均）：20 ℃
• 运行小时数：6,000 / 年
• 能源价格：$0.12 / kWh

节能量 = 1.2 × 10,000 × 0.75 × 20 × 6,000 ÷ 1000 = 1,080,000 Wh = 1,080 kWh/年.
价值 = 1,080 × $0.12 = 129.6美元/年.
若装置（含安装）费用为$1,500，则投资回收期约为 11.6年 – but add fan-energy savings and incentives, and real projects in cold climates often land at 2-4 years.

Factors That Shorten Payback

• 更高的dT（更冷的气候、更热的排风）
• 更长的运行时间（连续工艺）
• 更高的能源价格
• 返利或碳信用
• 供暖＋制冷的复合节约（焓）

Turn the estimate into a decision with a short sensitivity check. Vary the two strongest drivers, the temperature difference and the operating hours, to see how fragile the payback is; a project that only works at the best guess is risky. Add the fan-energy penalty and any cooling saving from enthalpy recovery, since ignoring either skews the result. Then layer in incentives, carbon pricing, or an energy-service contract, which can move a marginal case to clearly worthwhile. Treat the formula as a screening tool and confirm with the manufacturer curve and, for larger spends, a detailed model. Our 热回收解决方案 include performance data to support that check.

常见问题

是否应包含风机能耗？
Yes – subtract the extra fan electricity from the saved heating value for a true net payback.

这个精度足以作为采购依据吗？
It is a good screening estimate; confirm with the manufacturer’s performance curve and a detailed energy model before purchase.

常见问题

是否应包含风机能耗？

是的 — 从节约的供暖价值中扣除风机额外耗电，才能得到真实的净回收期。

这个精度足以作为采购依据吗？

这是一个很好的初步估算；采购前请用厂家性能曲线和详细能耗模型加以确认。