PL249201B1 - Device for ventilation and heat recovery - Google Patents

Abstract

A ventilation and heat recovery device installed in a ventilation duct located between a room in a building and an open space consists of a pipe, fans, and a nozzle. The ventilation duct (1) includes a pipe (2) with high thermal conductivity, the first end of which is located in the room beyond the outlet of the ventilation duct (1) and to which a supply nozzle (3) is attached, connected to the room's wall grille (4). At the other end of the pipe (2), a supply fan (5) is installed, mounted in a combined external air intake/exhaust vent (6). At the end of the duct (1) on the open space side, an exhaust fan (7) is installed, mounted in a combined external air intake/exhaust vent (6). On the outer surface of the pipe (2), there are lamellas (8), preferably spirally wound.

Description

The subject of the invention is a device for ventilation and heat recovery.

Ventilation devices capable of recovering heat from exhausted ventilation air are known. These inventions are used in mechanical supply and exhaust ventilation systems, primarily in air handling units for ducted installations. Patent description KR101193222B1 describes a supply and exhaust ventilation device consisting of a cross-flow heat exchanger and fans. Control is provided by dampers mounted in circular ventilation ducts. Utility model CN205897430U also describes a supply and exhaust ventilation device that, in addition to a sheet metal cross-flow heat exchanger for heat recovery, also includes a heater, a cooler, and air filters. The device described in patent description US6948553B1, which has a cross-flow heat exchanger for heat recovery, is characterized by the fact that the rotors of two fans are mounted on the shaft of a single electric motor. Rotary rotor heat exchangers are also used in supply and exhaust ventilation systems. Patent application EP2101137A1 presents a unit with a rotary rotor, in which heat accumulation occurs in the walls of small passageways. Linear counterflow heat exchangers are also known, which can be installed in a circular duct, as shown in patent application JP2012093084A. Patent application CN110612426A presents a spiral heat exchanger with spirally arranged walls, which increases the heat exchange surface and turbulence of the flowing air. Devices that enable decentralized ventilation of individual or groups of rooms, suitable for use in buildings without ventilation ducts, are also known in the art. These include counterflow in-wall heat exchangers installed in a wall opening, such as the Viessmann Vitovent 200-D or the one described in patent application WO2021/068996A1. Other heat exchanger designs are mounted on the outside of an external wall, as in patent application GB2373849A. These can also be unidirectional in-wall heat exchangers with a heat accumulator, cyclically changing the airflow direction, such as the Viessmann Vitovent 100-D. Patent applications also describe devices for installation in gravity ventilation ducts, such as patent application EP2369254A2, a system with a flexible ventilation pipe placed in the duct, with a heat exchanger at the outlet.

The technical problem to be solved is the need to improve ventilation conditions with heat recovery in buildings with a single ventilation-gravity duct.

The essence of a ventilation and heat recovery device installed in a building's ventilation duct located between a room in the building and an open space, consisting of a pipe, fans, and nozzle, is that the ventilation duct contains a high-thermal-conductivity pipe. The first end of the pipe is located in the room, beyond the ventilation duct outlet. A supply nozzle connected to the room's wall grille is attached to the pipe. At the other end, a supply fan is installed, mounted in a combined external air intake/exhaust vent. At the end of the duct facing the open space, there is an exhaust fan mounted in a combined external air intake/exhaust vent. Preferably, the outer surface of the pipe has fins, preferably spirally wound.

A beneficial effect of the invention is that the device is designed for decentralized mechanical supply and exhaust ventilation with heat recovery in rooms with existing gravity ventilation. Installation of the device does not require structural modifications to the building, only the installation of the system within the existing gravity ventilation duct, a dedicated wall grille in the room, and an external grille equipped with fans. The use of fans at the duct outlet minimizes noise transmission into the room.

The invention is presented in an embodiment in the drawing, where Fig. 1 shows a perspective view of the assembled device in a cross-section of a gravity ventilation duct, Fig. 2 - a cross-section of the ventilation duct with a ventilation and heat recovery device installed.

The ventilation and heat recovery device in the example embodiment consists of three main elements: a ventilation pipe 2, a combined external air intake/exhaust vent 6, and a room wall grille 4. In the upper part of the ventilation duct 1, pipe 2 is attached to the combined external air intake/exhaust vent 6 via the intake/exhaust connector 12. The combined air intake/exhaust vent 6 is made of plastic and has a rectangular shape. In the upper part, it has air exhaust openings, while in the lower part it has air intake openings 14 connected to the connector 12. The combined air intake/exhaust vent 6 has a roof 15. Inside the air intake/exhaust vent 6, an axial supply fan 5 and an axial exhaust fan 7 are mounted. The supply fan 5 and exhaust fan 7 are VKO100 type fans from VENTS GROUP and are powered from a 230 V mains. The supply fan 5 and exhaust fan 7 are connected to the electrical system via a power cable laid in the space created between pipe 2 and duct 1. The room wall grille 4 is made of plastic. In the central part, it has an supply nozzle 3 connected to pipe 2 by a connector 9 of the room grille 4, while in the peripheral part it has exhaust openings 10. The direction of the nozzle 3 is adjusted by means of an articulated joint 11. A flexible pipe 2 with a diameter of 75 mm, made of aluminum with a wall thickness of 0.5 mm, is connected to the connector 9. On the outer surface, along the entire length of pipe 2, there are spirally arranged lamellas 8, 25 mm wide and 0.5 mm thick. The lamellas 8 maintain the distance between the pipe 2 and the walls of the ventilation channel 1 and increase the heat exchange surfaces between the exhaust and supply air.

In the device, the air supplied to the room flows inside the pipe 2 and the air removed from the room flows in the space created between the pipe 2 and the existing ventilation duct 1.

List of markings

- ventilation duct

- pipe

- air supply nozzle

- room wall grid

- supply fan

- combined intake-exhaust

- exhaust fan

- lamellas

- grille connector

- exhaust openings

- articulated joint

- intake-exhaust connector

- ejection holes

- intake holes

- visor

Claims (2)

1. A device for ventilation and heat recovery mounted in a ventilation duct of a building located between a room in the building and an open space, having a pipe, a fan and a nozzle, characterized in that in the ventilation duct (1) there is a pipe (2) with high thermal conductivity, the first end of which is located in the room beyond the outlet of the ventilation duct (1) and to which an air supply nozzle (3) is attached, combined with a wall grille (4) of the room, and at the other end of the pipe (2) there is an air supply fan (5) mounted in a combined external air intake-exhaust vent (6), while at the end of the duct (1) on the side of the open space there is an exhaust fan (7) mounted in a combined external air intake-exhaust vent (6). 2. A device according to claim 1, characterized in that on the outer surface of the pipe (2) there are lamellas (8), preferably spirally wound.