Ethylene Glycol Heat Recovery Ventilation Unit

An ethylene glycol heat recovery ventilation unit is an air handling device that uses ethylene glycol solution as a heat transfer medium to recover heat or cooling energy from exhaust air, improving the energy efficiency of air conditioning systems. It is widely used in places requiring strict separation of fresh and exhaust air, such as hospitals, laboratories, and industrial facilities.

Working Principle

The ethylene glycol heat recovery ventilation unit achieves energy recovery through a heat exchanger and ethylene glycol solution:

1. Exhaust Side: The cooling or heating energy in the exhaust air is transferred to the ethylene glycol solution via a heat exchanger, altering the solution's temperature.
2. Fresh Air Side: A circulation pump delivers the cooled or heated ethylene glycol solution to the fresh air side's heat exchanger, adjusting the fresh air temperature to reduce the operating load and energy consumption of the air conditioning system.
3. Heat Recovery Efficiency: The heat recovery efficiency of the ethylene glycol solution can reach about 50%, depending on system design and operating conditions.

System Components

• Fresh Air Side: Fresh air section, primary/medium efficiency filter section, ethylene glycol heat exchanger, and supply fan section.
• Exhaust Side: Return air section, primary efficiency filter section, ethylene glycol heat exchanger, and exhaust fan section.

Applications

• Suitable for scenarios requiring complete isolation of fresh and exhaust air, such as hospitals and cleanrooms.
• Ideal for industrial or commercial buildings needing efficient energy recovery, such as factories and transportation facilities.

Преимущества

• High Energy Efficiency: Reduces air conditioning system energy consumption through heat recovery, lowering operating costs.
• Flexibility: Adjusts fresh air temperature based on varying climate conditions, adapting to diverse environments.
• Safety: Ethylene glycol solution prevents heat exchanger freezing in low-temperature environments.

Considerations

• Maintenance: Regular checks on the ethylene glycol solution concentration and circulation pump operation are necessary.
• Design Requirements: System design must consider the layout of fresh and exhaust air ducts to ensure efficient heat exchange and prevent cross-contamination.