Heat Recovery Units

Product Details

Air handling units condition indoor air with their heating, cooling, humidification and de-humidification functions. Furthermore, air handling units supply the fresh air requirement of the environment with filtered air. According to standards, mechanical strength, block air leakage, filter bypass leakage, thermal conductivity, thermal bridging, and acoustic isolation tests are conducted. In order to perform these tests, a model box bearing similar design properties to the air handling unit is manufactured and tests are performed on this model box.

There are two basic criteria for mechanical strength
• Relative bending value of the body at design conditions (mm/m)
• Mechanical strength of the body at maximum fan operating pressure indicates that there is no permanent deformation in the body under this
pressure Relative Bending Test – conducted at 1000 Pa pressure Relative Fan Pressure Test – conducted at 2500 Papressure

The properties sought in air handling unit casings are the following
• Low thermal conductivity coefficient
• Low heat bridging
• Low sound permeability
• Low air leakage
• Capability to bear air handling unit elements and with stand the positive and negative pressures created within the unit
• For its materials to be environment friendly, hygienic and have the desired fire rating
• That rain or snow does not permeate units that are placed outdoors.

Capacity Air flow 800 to 20000 CFM & above
Static Pressure: As per requirement
(Generally 50mm to 200mm)

Air Leakage from the Body
Air leakage tests are performed in a manner that will ensure a performance oriented product.

Filter Bypass Leakage
Filter bypass leakage tests are conducted under a pressure on the filter section.

Thermal Conductivity
High thermal resistance of the casing is important not only in terms of heat loss, but also in terms of condensation that may occur on the unit casing. Condensation on unit surfaces leads to an increase in heat loss on the casing as well as expediting corrosion and unhygienic conditions. Since more than 90% of the unit casing surfaces consist of panels, low heat conduction coefficient in panels means that the thermal connectivity coefficient of the unit casing will be low as well.

Rotor Type Heat Recovery Unit
It operates on the regenerative principle. Heat recovery is achieved with the turning of the rotor. The heat and temperature of the exhaust air is transferred to the rotor blades with the turning motion of the heat exchanger rotor. The transferred moisture and heat energy is passed on to fresh air by the continued rotation. In addition to heat transfer conducted during the winter, it is also possible to save energy and conduct dehumidification with the same unit in the summer.