A typical coil energy recovery (runaround) loop system places extended surface, finned tube water coils in the supply and exhaust air streams of a building or process. The coils are connected in a closed loop via counterflow piping through which an intermediate heat transfer fluid (typically water or a freeze-preventive solution) is pumped. We are manufacturer complet run around coil heat recovery units. You can contact us for your needs.

This system operates for sensible heat recovery only. In comfort-to-comfort applications, energy transfer is seasonally reversible the supply air is preheated when the outdoor air is cooler than the exhaust air and precooled when the outdoor air is warmer.

Advantages

• Does not require that the two air streams be adjacent to each other,
  
• Several air streams can be used,
  
• Has relatively few moving parts  a small pump and control valve,
  
• Relatively space efficient,
  
• The cooling or heating equipment size can be reduced in some cases,
  
• The moisture removal capacity of existing cooling equipment can be improved,
  
• No cross contamination between air streams.

Disadvantages

• Adds to the first cost, to the fan power to overcome add coil pressure drop, and for the glycol circulating pump,
  
• Requires added glycol pump and piping, expansion tank, and a three-way freeze protection control valve,
  
• Requires that the air streams must be relatively clean and may require filtration.