Manufacturing: paint-booth exhaust heat to 70°C wash water
Illustrative low-lift heat pump recovering booth exhaust to supply parts wash water.
Engineering data
- Case type
- Illustrative engineering example
- Data status
- illustrative
- Industry
- Waste heat recovery
- Source temperature
- 28–35°C
- Sink temperature
- 65–70°C
- Temperature lift
- ≈ 30 K
- Heating or cooling duty
- 350 kW
- Architecture
- Air-to-water heat pump + glycol recovery coil
- Result status
- Illustrative strong ROI on two-shift booth runtime
- Key risk
- VOC / coil fouling; filtration maintenance; weekend load swing
- Existing system
- Electric / gas wash-water heaters; booth exhaust rejected
- Refrigerant
- R513A / R515B class
- COP
- 3–3.6
- Annual savings
- Illustrative 25–40% wash-heat energy cost cut (tariff-dependent)
- Estimated payback
- Illustrative <4 years on two-shift duty
Project background
An automotive supplier exhausted warm booth air while purchasing electric or gas heat for wash lines.
Source / inputs
Source: filtered exhaust air ~28–35°C equivalent. Sink: wash water 65–70°C. Duty: ~350 kW.
Heat pump solution
Air-to-water heat pump with glycol coil recovery and fouling-tolerant exchangers; weekend setback strategy.
COP & savings
Illustrative COP 3.0–3.6; strong when booth runs two shifts.
Investment / ROI notes
Payback often <4 years where electricity is competitive and booth runtime is high.