How to apply industrial heat pumps
How industrial heat pumps work, where they fit on the temperature ladder, what drives their coefficient of performance, and how to find good sources and sinks.
What an industrial heat pump does
A heat pump moves heat from a lower temperature to a higher one using a relatively small amount of work. It is the same thermodynamic machine as a refrigerator, run for the heat it delivers rather than the cooling it provides. For industry, the appeal is efficiency: because it moves heat rather than creating it, a heat pump can deliver several units of useful heat for each unit of electricity, where a resistance heater or boiler delivers at most one.
That multiplier is why heat pumps are central to electrifying low- and medium-grade process heat. They take heat that is otherwise rejected — from cooling water, exhaust air, effluent or a refrigeration plant — and upgrade it to a temperature the process can use.
Coefficient of performance and what drives it
The key metric is the coefficient of performance (COP): useful heat delivered divided by work input. A higher COP means more heat per unit of electricity and lower running cost and carbon.
The single biggest driver of COP is the temperature lift — the gap between the source and the delivery temperature. The smaller the lift, the higher the COP. This has a direct design consequence: find the warmest available source and serve the coolest acceptable sink. A heat pump asked to lift heat across a large temperature gap will have a poor COP and may not beat a boiler on running cost.
Where heat pumps fit on the temperature ladder
Heat pumps are not for every duty. Their sweet spot is low- and medium-grade heat:
- Space and water heating, washing, drying, low-temperature process — classic, high-COP territory.
- Medium-grade process heat and low-pressure steam — increasingly served by high-temperature industrial heat pumps and mechanical vapour recompression.
- High-temperature process — generally beyond heat-pump reach today, better served by electrification by other means, or by combustion fuels.
The practical rule is to electrify the bottom of the ladder with heat pumps, where the efficiency multiplier is largest, and reserve other technologies for the genuinely hot duties.
Finding sources and sinks
A heat pump needs a source to draw from and a sink to serve. The best projects pair the two well:
- Sources — cooling-water return, refrigeration condenser heat, exhaust air, warm effluent, compressor heat. Warmer and more continuous is better.
- Sinks — pre-heating feedwater or process water, space heating, drying, washing duties. Cooler and more continuous is better.
The ideal is a site that simultaneously needs cooling and heating, because a single heat pump can do both — taking heat from where it is unwanted and delivering it where it is. Mapping these flows is often the highest-value part of a heat-pump study.
Working fluids and equipment types
Several heat-pump configurations serve industry. Closed-cycle compression heat pumps use a refrigerant and an electric compressor, and dominate low- and medium-grade duties. Mechanical vapour recompression takes a process vapour, compresses it to raise its condensing temperature, and reuses the heat — very efficient where a suitable vapour stream exists, as in evaporation and distillation. Absorption heat pumps use heat rather than electricity to drive the cycle, which can suit sites with abundant waste heat.
Refrigerant choice matters for both performance and compliance, as regulations tighten on high-global-warming-potential fluids. Natural and low-GWP refrigerants are increasingly specified, particularly for higher-temperature duties.
How to scope a heat-pump project
A disciplined scoping sequence avoids oversized, underperforming installations:
- Profile heating and cooling demand by temperature and by time — continuity matters as much as quantity.
- Identify the warmest source and the coolest acceptable sink to minimise lift.
- Estimate COP at realistic operating conditions, not just the best-case rating.
- Compare running cost against gas and electric-boiler alternatives at expected electricity and fuel prices.
- Reduce demand first — recover waste heat and insulate hot surfaces — so the heat pump is sized for a smaller, cleaner load.
Done well, a heat pump turns rejected low-grade heat into a genuine asset and is often the most efficient way to electrify the lower end of a site's heat demand.
Frequently asked questions
How can a heat pump deliver more energy than it consumes?
It does not create energy — it moves existing heat from a lower temperature to a higher one using work. Because it transfers heat rather than generating it, the useful heat delivered can be several times the electrical input. That ratio is the coefficient of performance.
What limits a heat pump's efficiency?
The temperature lift — the gap between the source and the delivery temperature. The larger the lift, the lower the coefficient of performance. Good design finds the warmest available source and serves the coolest acceptable sink to keep the lift small.
Can heat pumps make steam?
High-temperature industrial heat pumps and mechanical vapour recompression can reach low-pressure steam and medium-grade process temperatures, and the achievable range keeps rising. Very high-temperature duties remain beyond heat-pump reach and need other technologies.
What is the best site for a heat pump?
One that needs heating and cooling at the same time, because a single machine can reject heat from the cooling duty straight into the heating duty. Pairing a warm waste-heat source with a cool, continuous heat sink gives the best economics.
Related guides
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Software that helps
Schneider EcoStruxure
IoT platform for energy and plant resource management.
AVEVA Predictive Analytics
Early-warning analytics for critical process and power assets.
Seeq
Advanced analytics for time-series process data.