Air-to-Air Heat Exchanger Types Compared
Plate, rotary wheel, heat pipe, enthalpy plate and run-around coil each win in different applications. Use the matrix to compare them at a glance, then follow the decision flow to pick the right core.
Side-by-side comparison
| Attribute | Sensible Plate (aluminum) | Enthalpy Plate (membrane) | Rotary Wheel | Heat Pipe | Run-Around Coil |
|---|---|---|---|---|---|
| Heat-transfer mechanism | Solid-wall conduction | Membrane + moisture permeation | Rotating thermal mass | Phase-change working fluid | Two coils + circulating fluid |
| Energy recovered | Heat only | Heat + some moisture | Heat + moisture | Heat only | Heat only |
| Typical effectiveness | 60–75% | 55–70% | 70–85% | 50–65% | 45–65% |
| Cross-contamination risk | None (separated) | None (membrane) | Small carry-over | None (separated) | None (piped) |
| Moving parts | None | None | Motor + seal | None | Pump (optional) |
| Pressure drop | Medium | Medium–high | Medium | Low–medium | Low–medium |
| Frost tolerance | Needs strategy | Needs strategy | Needs strategy | Good | Good (fluid) |
| Relative cost | Low–mid | Mid | Mid–high | Mid | Mid–high |
| Best for | Isolation, cost, drying | Isolation + humidity | Shared air, high humidity | Compact, frost, isolation | Strict isolation, remote loops |
| Avoid when | Max efficiency needed | Budget tight | Streams risk-separated | Highest recovery needed | Space/complexity limited |
Decision flow
- Are the two airstreams risk-separated? (exhaust carries fumes, dust, pathogens, odors) — If yes, use a separated core (sensible plate, enthalpy plate, heat pipe, or run-around coil). Never a rotary wheel.
- Do you need moisture (latent) recovery? — If yes and streams are shared, an enthalpy rotary wheel gives the highest total effectiveness. If streams are separated, use an enthalpy (membrane) plate core.
- Is this a contaminated / mine / pharma / data-center exhaust? — Pick heat pipe or sensible plate; these tolerate dust and guarantee isolation.
- Priority? — Max efficiency → rotary wheel (shared air only). Compact / freeze-tolerant / easy retrofit → heat pipe. Lowest cost / robust → sensible plate. Remote or strictly isolated loops → run-around coil.
- Cold climate? — Add freeze protection: preheat, bypass, or choose a heat-pipe / run-around design that tolerates frost better.
Still unsure? Open the application selector →
Core types & products
Sensible Plate
Heat onlyNo moving partsIsolatedCounter- or cross-flow aluminum core. Cheapest, most robust, ideal for drying, mines and contaminated exhaust.
Plate exchangers →Enthalpy Plate
Heat + moistureIsolatedMembrane/polymer core that also transfers humidity with zero mixing — the only latent option for separated streams.
Air-to-air range →Rotary Wheel
Heat + moistureHighest εMoving partEnthalpy or sensible wheel for shared-building air with the highest recovery (70–85%). Not for separated streams.
Rotary wheel →Heat Pipe
Heat onlyCompactFreeze-tolerantPassive phase-change core, no motor, easy retrofit, excellent for mines, pharma and cold climates.
Heat pipe →Need a sizing or a second opinion?
Send us your airflow, temperatures and exhaust description — our engineers will specify the core, freeze protection and pressure budget for your exact duty.
Call: 15753355505
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