B在把资金投入空气-空气热回收系统之前,任何认真的买家都会问同一个问题:多久能回本?答案并非谜团,也不需要专业软件;一张电子表格加清晰的方法,就能给出一个经得起财务与节能规范审查员双重审视、站得住脚的简易回收期数字。本文列出核心公式,走一遍完全算好的例子,列明成本侧应包含的内容,并指出让大多数业余回收估算要么盲目乐观、要么无谓悲观的那两个错误。
The core formula
每小时回收的能量等于空气质量流量乘以其比热,再乘以排气与流入补风之间的温差,再乘以换热芯效率。以空气实用单位计:回收功率等于风量(m3/h)×空气密度(约1.2 kg/m3)×比热(约1.0 kJ/kg·K)×温升(K)×效率,除以3600将kJ/h换算为kW。乘以年运行小时得到年kWh,再乘以您的能源单价得到年节省金额(货币)。一 板式换热器 以70%效率、10,000 m3/h风量、20 K冬季温升运行时,每个运行小时都在回收真实、可计费的能量。 空气-空气回收 经济性系于这一行,所以要把风量和温升弄对。
Worked example
取一台移动10,000 m3/h的补风单元,冬季设计温升20 K,显热效率70%的板式换热芯,年运行4,000小时(供暖季单班工厂),天然气供暖有效成本0.05货币单位/kWh热量。回收功率=10,000×1.2×1.0×20×0.70/3,600=46.7 kW。年能量=46.7×4,000=186,800 kWh。年节省=186,800×0.05=9,340货币单位。若已安装回收包造价28,000,简单回收期=28,000/9,340=约3.0年。这还未计任何返利,也未计入夏季较小的制冷节省。同一套算法适用于一 旋转轮 或一 run-around coil;只有效率与压降惩罚会变化。
| 输入 | 数值 | 备注 |
|---|---|---|
| 风量 | 10,000 m3/h | 设计补风 |
| 冬季温升 | 20 K | 排气减流入 |
| 效率 | 70% | 显热板式 |
| 运行小时 | 4,000/年 | 供暖季,单班 |
| 能源成本 | 0.05/kWh | 燃气供暖有效 |
| 年节省 | 9,340 | 货币单位 |
| 安装成本 | 28,000 | 换热芯加安装 |
| 简单回收期 | 3.0年 | 不含返利 |
What to include
The cost side is where estimates go wrong. Capture the full installed cost: the core, its housing and bypass, control integration, labour, and any duct or curb modifications. Add a maintenance line, plates and wheels need periodic cleaning and occasional gasket or bearing service. Then subtract applicable incentives, many utilities and some jurisdictions offer rebates for energy recovery that meet code thresholds, which can cut the effective cost by 10 to 30 percent. Finally, run a sensitivity on fuel escalation: energy prices tend to rise, so a payback calculated at today’s price is conservative, and showing the 5- and 10-year cumulative cash position is more honest than a single payback number. Our 选型指南 将这套计算与装置选型相配对。
Pitfalls
两类错误主导了糟糕的投资回收研究。其一是忽视风机动力惩罚:回收换热芯增加压降,风机因而耗用更多电力,在临界设计中这额外的一度电可能抹去热节省中令人意外的一部分。务必将回收热量与增加的风机能耗相抵。其二是使用铭牌效率而非实际效率;结垢、部分旁路或失衡的换热芯很少达到其目录数值,因此应对安装效率(通常比铭牌低5至10个百分点)建模,你便会接近电表所示。把这两点做对,估算便足以可靠到能为项目融资。
Size your recovery with QIYU
QIYU提供板式、转轮与热管式空气-空气换热芯,并附已文档化的效率与压降曲线,以喂入您的投资回收模型。请将您的风量、温升、运行小时与能源成本告知我们, 联系我们 以获取按规格报价的方案。可通过 WhatsApp +86 15753355505、美国电话 +1 915 295-3666,或邮件 kuns913@gmail.com 联系杨经理。我们帮您选择合适的型号,或设计定制回收方案。
常见问题
What is the core payback formula?
Recovered power is airflow times air density times specific heat times the temperature lift times effectiveness, converted to kW, then multiplied by annual hours and unit energy cost to get annual saving.
What mistake makes estimates too optimistic?
Using peak design lift all year instead of a realistic seasonal average, or ignoring fan and pump parasitic power, overstates saving and shortens the apparent payback.
What makes estimates too pessimistic?
Charging the full recovery capital against only the winter saving, or omitting demand-charge and rebate benefits, can make a good project look unattractive.
Does it need specialist software?
No. A spreadsheet with the airflow, lift, effectiveness, hours and unit cost gives a defensible simple-payback number that survives finance and code review.
相关产品
面向暖通空调与通风的板式、旋转式或热管回收。
空气与液体用大表面积固定芯体。
大风量用高效能量回收。
用于洁净场合的被动、完全分离气流。