HRU

HRU

HRU

HRU

Heat Recovery Unit (HRU)

A heat recovery unit (HRU) can make mechanical ventilation more cost effective by reclaiming energy from exhaust airflows. HRU use air-to-air heat exchangers to heat incoming fresh air, recovering 40 to 85 percent of the temperature and/or that would otherwise be lost. Savings:
  • HRU can reduce 40% of fuel cost in stenter, without any compromise.
  • Payback period of 2 years.
    • Working
    • Technical Data
    • Features
    • Applications
    • Exhaust gas from the system is redirected from chimney to HRU. for heat recovery.
    • The exhaust gas passes through tubes in one direction, while the fresh air is passes by fins in counter direction.
    • Due to close contact of exhaust air and fresh air, heat transfer takes place.
    • The recovered heat is passed in to the system (dryer) and exhaust air is reconnected to chimney.
    • Flow is managed by two fans and controlled by damper.
    • Exhaust air inlet temperature to HRU 120 – 200 °C (depending on the process)
    • Exhaust air outlet temperature from HRU 70 - 100 °C
    • Ambient air inlet temperature to HRU 30°C - 35°C
    • Ambient air outlet temperature to HRU 130 - 140°C
    • Two layers of 25mm thick Insulation is provided all over the unit, to avoid the loss of heat when the system is in operation.
    • Can be easily fitted into existing exhaust duct, which eliminates the expensive re-ducting.
    • Completely pre-assembled and ready for installation.
    • Simple design, Easy and low maintenance cost, Cost efficient
    • HRU is suitable for commercial usage and mostly used in textile industry for stenter and dryer.
    • It can also be used for different application, where exhaust heat is between 120°C to 230°C.