Heat Recovery

Imofa UK employs various forms of heat recovery in the design and manufacture of its bespoke air handling units maintaining air-quality standards whilst recovering as high a percentage as possible of the heat from the exhausted air stream.

Recovery of heat from the exhaust air in balanced ventilation systems and it’s efficient transfer to the supply fresh air offers major potential for energy savings, contributing significantly to building energy efficiency and the reduction of carbon emissions…

Recuperative Plate Heat Exchangers

No moving parts, built up of alternating layers of plates through which the heat is transferred between the separated supply and exhaust air streams.

  • Corrosion resistant heat transfer plates
  • Extended surface plate design for high heat transfer efficiency
  • Total separation of supply and exhaust airstreams ensuring no cross contamination
  • Efficiency function of plate gaps and lengths, and air flow rate
Energy savings up to 80% Crossflow
Energy savings up to 80% Crossflow
Two heat exchangers can be arranged in a cross / counter flow pattern to increase efficiency.
Energy savings up to 95% Counterflow Energy savings up to 95% Counterflow
Optimised efficiency due to extended heat transfer surface.
Recuperative Plate Heat Exchangers

Rotary Heat Exchangers

Rotary heat exchangers are also employed as a well proven and efficient means of heat recovery providing up to 80% energy savings. The rotating wheel (rotor) is made up of an air permeable heat transfer matrix which picks up heat from the exhaust air and releases it as the wheel passes through the cooler supply air. Depending on the air conditions, and using desiccant coated rotors the heat recovery wheel can also transfer moisture providing both sensible and latent energy recovery.

Mini HR Rotary Fan
Thermal Wheel Flow Diagram

Run–around Coils

A run around coil heat recovery system consists of two matched coils, one located in the exhaust contaminated air stream and the other in the supply fresh air stream. The heat exchange medium (usually water) is pumped in a continuous loop through the coils in a single direction at a constant rate.