The low-grade problem
Much recoverable heat is low-grade – 25-60C drain water, vent air, or process streams. Too cool to use directly, but too warm to waste. A heat pump lifts it to a useful temperature using a little electrical work.
How it pairs with air-to-air recovery
从被动式方案开始： 空气-空气或空气-水回收 以获取容易实现的节能等级，随后由热泵升级处理剩余部分。在泳池或洗衣房中， 排水余热回收 feeds the heat pump’s evaporator.
Where it pays
COP and payback
当被动式方法不足时，提供 3-5 倍输入能量（COP 3-5）的热泵可使低品位热回收具备经济性。请用以下方法验证： 投资回收期计算 并阅读以下： 工业余热案例 以获取真实案例。
The temperature-lift principle
A heat pump value is that it moves more energy than the electricity it consumes, expressed as COP. For low-grade waste streams of 25 to 60C, a correctly sized heat pump can deliver three to five times the input energy as useful heat, lifting drain, vent, or process heat to the 45 to 60C needed for hot water or heating. The higher the source temperature and the smaller the required lift, the better the COP.
Layering passive and active recovery
The efficient pattern is passive first, active second: catch the easy grade with air-to-air or air-to-water recovery, then let the heat pump upgrade what remains. In a pool or laundry this means drain-water recovery feeding the heat pump evaporator, with the condenser supplying hot water. Stacking the two extracts more from the same waste stream than either alone.
Verification and control
Measure the heat pump actual COP under operating conditions, not just the nameplate, and confirm the source stream is reliably available, since recovery that idles because the drain or vent flow stops delivers nothing. Control should prioritize the heat pump when the source and demand coincide, and fall back gracefully otherwise. Validate the whole scheme with a payback calculation.
常见问题
What is heat pump waste heat recovery?
Using a heat pump to lift low-grade waste heat of 25 to 60C to useful temperatures with a small electrical input.
What COP can I expect?
Typically 3 to 5, delivering three to five times the input energy. The COP improves with a higher source temperature and a smaller lift.
How does it pair with passive recovery?
Passive air-to-air or air-to-water recovery catches the easy grade first, then a heat pump upgrades what remains, such as drain water feeding the evaporator.
Where does it pay?
Domestic hot water from vent or drain heat, process pre-heat in food plants, and space heating. Validate with a payback calculation.
常见问题
What is heat pump waste heat recovery?
Using a heat pump to lift low-grade waste heat of 25 to 60C to useful temperatures with a small electrical input.
What COP can I expect?
Typically 3 to 5, delivering three to five times the input energy. The COP improves with a higher source temperature and a smaller lift.
How does it pair with passive recovery?
Passive air-to-air or air-to-water recovery catches the easy grade first, then a heat pump upgrades what remains, such as drain water feeding the evaporator.
Where does it pay?
Domestic hot water from vent or drain heat, process pre-heat in food plants, and space heating. Validate with a payback calculation.
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。