The Fluid Does the Work
A heat pipe transfers heat through evaporation and condensation of a sealed working fluid. The fluid must stay liquid at the cold end and vapour at the hot end across your operating range.
Common Fluids
| Fluid | Typical range | Use |
|---|---|---|
| Water | Moderate to high temp | Building HVAC, above freezing |
| Ammonia | Low temp | Cold storage, freezers |
| Refrigerants (R134a etc.) | Low to moderate | General HVAC |
| Acetone / methanol | Very low temp | Specialty, cryogenic |
Selection Criteria
- Operating temperature - pick a fluid whose range brackets your duty
- Freeze risk - for sub-zero, use ammonia or a low-temp refrigerant
- Compatibility - fluid must not corrode the tube wall
- Pressure - vapour pressure at hot end must stay safe
Watch-out
Mismatched fluid is the most common heat-pipe failure. Specify the fluid from the coldest and hottest expected temperatures, not the average.
What This Product Does
This unit is built as a compact air-to-air heat exchanger that transfers thermal energy between two separate air streams without allowing them to mix. Warm exhaust air passes over one side of the core while cooler supply air passes over the other, and the temperature difference drives heat from the warm stream to the cool one. The result is pre-conditioned make-up air that needs far less external heating or cooling, which lowers the load on the building or process system.
Construction and Materials
The core is formed from corrugated aluminium or stainless-steel plates bonded into a counter-flow pack, with sealed channels that keep the two air paths isolated. Frames are typically galvanised or powder-coated steel, and service doors give access for inspection and cleaning. Gasket materials are selected for the operating temperature and any mild chemical exposure, so the unit stays reliable in demanding ventilation duties.
Where It Fits
In the Heat Pipe Working Fluid Selection configuration the exchanger is suited to HVAC make-up air units, paint and coating ovens, food and pharmaceutical drying, and general process ventilation where energy cost is a concern. It can be mounted horizontally or vertically to match the available plant layout, and it connects with standard flanged ductwork for straightforward integration with existing fans.
Frequently Asked Questions
Does it need power to operate? The passive core needs no electricity; only the associated fans and controls consume power. How often should it be cleaned? Inspect at least once per season and clean the exhaust side when temperature recovery begins to drop.