What Are Heat Recovery Units?

Heat Recovery Units are mechanical equipment that reduce energy loss in ventilation systems by transferring heat between exhaust air and fresh air.

These units operate by transferring energy between indoor exhaust air and outdoor fresh air without mixing the air streams, or in a controlled manner. Their purpose is to reduce the heating or cooling demand of fresh air, improve energy efficiency, and contribute to sustainable building operation.

How Do Heat Recovery Units Work?

The system transfers thermal energy from exhaust air to the fresh air stream. During winter, warm air discharged from indoors preheats the cold air drawn from outside. During summer, conditioned indoor air helps precool the warm outdoor air.

Heat transfer can be achieved using plate heat exchangers, rotary heat exchangers, heat pipe exchangers, or coil-based systems. The system type should be selected according to airflow rate, hygiene requirements, moisture-transfer needs, pressure loss, and the application area.

Applications of Heat Recovery Units

• Office buildings and business centres
• Shopping centres
• Hotels, restaurants, and social facilities
• Schools, universities, and educational buildings
• Hospitals, laboratories, and hygienic areas
• Industrial production facilities
• Air handling units and mechanical ventilation systems
• Spaces with high fresh-air requirements
• Commercial and industrial projects targeting energy efficiency

Advantages of Heat Recovery Units

• Helps reduce heating and cooling energy demand.
• Minimises energy loss while supplying fresh air.
• Contributes to maintaining indoor air quality.
• Supports lower operating costs in HVAC systems.
• Contributes to sustainable building, green building, and energy-efficiency goals.
• Can be designed according to different airflow rates, heat exchanger types, and installation configurations.
• Can be integrated into existing ventilation systems.

Key Components

• Heat recovery exchanger
• Fresh-air and exhaust-air fans
• Filter stages
• Damper and bypass system
• Condensate tray and drainage connection
• Housing, panels, and insulation structure
• Pressure, temperature, and filter contamination sensors
• Electrical panel and automation infrastructure
• Service doors and maintenance access sections
• Duct connection spigots and vibration connection equipment

Heat Recovery Unit Selection Criteria

Heat Recovery Units should be selected by evaluating airflow rate, fresh-air ratio, exhaust airflow, efficiency value, pressure loss, exchanger type, filter class, sound level, moisture-transfer requirements, frost risk, and installation space together.

In addition, duct routing, maintenance access, condensate drainage, automation integration, bypass requirements, fan selection, energy consumption, and room usage scenarios should be planned correctly. An incorrectly selected heat recovery system can adversely affect energy efficiency and ventilation performance.

Heat Recovery Methods

Different heat exchanger technologies can be used in heat recovery systems. In plate heat exchangers, the two air streams transfer heat through thin plate surfaces without mixing. This structure is a simple, reliable solution suitable for hygienic applications.

Rotary heat exchangers can achieve high efficiency through a rotating wheel structure and, depending on the application, can also provide moisture transfer. Heat pipe or coil-based systems can transfer energy between physically distant points.

The right method should be determined according to hygiene requirements, energy-efficiency targets, room type, maintenance needs, air-mixing risk, and investment budget.

Energy Efficiency and Operating Cost

As fresh-air requirements increase in mechanical ventilation systems, heating and cooling loads also increase. Heat recovery applications help reduce these loads and lower operating costs.

With high-efficiency heat exchangers, low-pressure-loss filters, correct fan selection, bypass control, and automation integration, Heat Recovery Units can be designed for more efficient operation.

Indoor Air Quality and Sustainability

In modern buildings, indoor air quality is as important as energy savings. Heat recovery systems support meeting fresh-air requirements while reducing energy loss.

This supports occupant comfort, ventilation quality, and sustainable building goals together. Heat recovery systems are an important energy-efficiency solution, especially in commercial and industrial projects requiring high fresh-air rates.

Airtes Heat Recovery Unit Solutions

Airtes offers a process-focused product selection and technical support approach for Heat Recovery Units used in commercial buildings, industrial facilities, offices, hotels, hospitals, laboratories, and projects with high fresh-air requirements.

During system assessment, airflow rate, fresh-air ratio, exhaust airflow, exchanger type, pressure loss, filtration, sound level, automation, installation space, and site conditions are considered together. This approach creates a safe, efficient, and long-lasting heat recovery solution tailored to the operating requirements.

Why Airtes?

• System selection suited to the project and intended use
• Solution-oriented approach for energy-efficient ventilation and HVAC applications
• Combined assessment of airflow, exchanger type, pressure loss, and filtration requirements
• Integration support for existing ventilation systems
• Installation, commissioning, and technical support suited to site conditions
• Safe and sustainable solutions matching operational needs

Frequently Asked Questions

What are Heat Recovery Units?

Heat Recovery Units are energy-efficient ventilation equipment that recover energy from exhaust air to precondition fresh air.

Where are they used?

They can be used in offices, shopping centres, hotels, hospitals, schools, laboratories, industrial facilities, and mechanical ventilation projects with high fresh-air requirements.

What is the difference between plate and rotary heat exchangers?

Plate heat exchangers transfer heat without mixing the air streams. Rotary heat exchangers can provide high efficiency and, depending on the application, moisture transfer through their rotating wheel structure.

Does a heat recovery system save energy?

Yes. By transferring energy from exhaust air to fresh air, heating and cooling loads are reduced. This helps lower operating costs.

What services does Airtes provide for these systems?

Airtes provides professional support for airflow assessment, heat exchanger type selection, filtration, duct connection, pressure loss analysis, system integration, installation, commissioning, and technical support.

Contact Airtes for Heat Recovery Units Suited to Your Project

A heat recovery system should not be selected before properly analysing the fresh-air requirement, exhaust airflow, room use, energy-efficiency target, exchanger type, filtration need, duct pressure loss, and installation space at your facility. The Airtes technical team provides professional support for a Heat Recovery Units solution suited to your operation.

You can contact us for detailed information, site surveys, and project-based quotations.