Heat recovery ventilation unit

A heat recovery ventilation unit for ventilating a building having at least one exterior wall, comprising:

• a first block having an air interconnection to interior of the building;
• a third block having an air interconnection to exterior of the building;
• and
• a second block located between the first block and the third block, the second block comprising a heat recovery exchanger mechanically connected to the second block;
• wherein the heat recovery exchanger comprises at least one first channel and at least one second channel;
• wherein the at least one first channel is in thermal contact with the at least one second channel;
• wherein for air interconnection to the exterior of the building, in the third block are installed an intake air duct for transporting fresh air from the exterior to the second block, and also an exhaust air duct, for the removal of waste air from the second block to the exterior;
• wherein for air interconnection to the interior of the building, in the first block are located a supply air duct, for conveying fresh air from the second block to the interior, and also an extract air duct, for transporting waste air from the interior to the second block, this second block being rotatable and equipped with a drive for rotating the second block including the heat recovery exchanger, relative to the first block and relative to the third block, the rotation of the second block being adjustable to a first position in which the at least one first channel is air interconnected to the intake air duct by its second end and its first end to the supply air duct and in which the at least one second channel is air interconnected by its second end to the exhaust air duct- and by its first end to the extract air duct, and the rotation of the second block being also adjustable to a second position, in which the at least one second channel is air interconnected by its second end to the intake air duct and by its first end to the supply air duct and in which the at least one first channel is air interconnected by its second end to the exhaust air duct and by its first end to the extract air duct;
• wherein the second block is positioned between the first block and the third block detachably;
• wherein the drive consists of a servo actuator;
• wherein to ensure the airtightness of all said air interconnections of the ends of the channels with the air ducts in both positions of the second block;
• the first block on its side facing the second block is provided with a first contact surface having an inner and an outer face;
• the third block on its side facing the second block is provided with a third contact surface having an inner and an outer face;
• the second block on its side facing the first block is provided with a second left contact surface having an inner and an outer face;
• and
• the second block on its side facing the third block is provided with a second right contact surface having an inner and an outer face;
• wherein all contact surfaces are airtight and sliding and each of them is provided with at least two openings for the passage of at least two separate air streams;
• and
• wherein at least one contact surface of the first contact surface and the second left contact surface is, on its inner face, supported by a first pad made of flexible airtight material, and also at least one contact surface of the second right contact surface and the third contact surface is, on its inner face, supported by a second pad made of flexible airtight material, the first block and the second block being connected to each other on their outer faces by pressing and the second block and the third block also being connected to each other on their outer faces by pressing.