HEAT RECOVERY AIR HANDLING UNIT

Abstract

This heat recovery air handling unit (1) comprises an indoor module (2), an outdoor module (4), a central module (3) with a plate heat exchanger (5), fans (11) (26), an inlet chamber (6) and an outlet chamber (7) of an exhaust duct, an inlet chamber (8) and an outlet chamber (9) of an intake duct, characterized in that the plate heat exchanger (5) is a counterflow or crossflow type heat exchanger, and the fans (11) (26) form opposing airflows, in which the fan (11) is located in the inlet chamber (8) or the outlet chamber (9) of the intake duct, and the fan (26) is located in the inlet chamber (6) or the outlet chamber (7) of the exhaust duct, and further comprising a condensate removal system. Figure for the summary: Fig 2

Description

Title of the invention: HEAT RECOVERY AIR HANDLING UNIT technical field

[0001] The utility model relates to ventilation equipment, specifically heat recovery air handling units, and can be used for installation in domestic and special purpose premises. TECHNICAL CONTEXT

[0002] The state of the art describes various technical solutions, forms and constructions designed for the natural ventilation of residential and commercial buildings.

[0003] The desire to find optimal ventilation system solutions is driven by the objective of designing buildings in a way that guarantees maximum energy efficiency. However, increasing a building's energy efficiency coefficient proportionally reduces the natural self-regulation of the indoor climate. In other words, in such buildings, due to the use of central heating, the operation of numerous household appliances, and other modern technological factors, significant drying of the indoor air occurs. This then creates conditions favorable to the development of allergic diseases and respiratory complications or illnesses.

[0004] In spring and summer, energy-efficient buildings do not effectively remove excess moisture, hindering natural air circulation in the premises and thus creating conditions favorable to the growth of mold and harmful microorganisms.

[0005] The above statements have been known for a long time. That is why, in many developed countries, medical institutions recommend frequent ventilation of premises. Most countries implement regulations governing air exchange systems.

[0006] Ventilation is primarily achieved by opening windows, thus allowing natural air circulation in the premises. However, ventilation achieved solely by opening windows leads to numerous drawbacks. In particular, during the winter, an open window significantly cools the room due to its surface area, while in the summer, it causes overheating. Consequently, this results in considerable energy consumption to maintain acceptable and comfortable working and living conditions. Therefore, continuous efforts are being made to develop and improve ventilation systems.

[0007] A known heat recovery air handling unit [patent UA no. 146223 F24F7 / 00, F28F13 / 14 of 27 January 2021], which includes a heat recovery unit The system consists of interconnected air ducts, a fan, and a heat exchanger mounted within the wall of a room between its external and internal surfaces. Two straight, concentric cylinders are installed in the opening between these surfaces, and a Q-shaped corrugated heat exchanger (in cross-section) is fixed between them on the external surface of the inner cylinder. Additionally, opposing external and internal fans are mounted on the internal surface of the cylinder. The unit's openings are fitted with corresponding external and internal covers, the inner cover having an air intake grille and an internal air outlet slot with an air diffuser. The external cover is further equipped with a condensate drain opening extending beyond the plane of the external wall surface, an air intake grille and a corresponding grille for internal air exhaust.

[0008] The disadvantages of this heat recovery air handling unit include a low degree of air heat exchange efficiency. When air passes along the heat exchange surface of the corrugated heat exchanger, the presence of cutouts in the heat exchanger's hollows reduces the heat exchange area. The low level of air exchange performance occurs because the airflow within the unit is unbalanced.

[0009] Furthermore, a drawback is the lack of resistance to wind loads. Since the outdoor unit is of an open type, it does not provide wind protection for the exhaust pipe and leads to the risk of the unit freezing in sub-zero temperatures.

[0010] Since it is structurally impossible to install complete heating and filtering devices, and since the power supply unit is located within the room module, additional heating of the heat recovery unit is not provided. The design of the heat exchanger results in excessive condensation and leads to possible freezing of the unit.

[0011] A known heat recovery air handling unit [Invention Application No. EP4417886A1 F24F12 / 00; F24F7 / 08; F28D21 / 00; F28F9 / 02; dated August 21, 2024] is designed for installation in an external wall of a building. The unit comprises an indoor module and an adjacent heat exchange module, which consists of a cylindrical corrugated heat exchanger with a multitude of heat exchange air channels arranged along the axis of symmetry of the heat exchanger. These air channels have identical cross-sections and are adjacent to one another, forming a continuous corrugated volume of heat exchange segments. The first and second separators are provided to separate and direct the exhaust and supply airflows in opposite directions within the heat exchange air channels. The first and second separators They are attached to the heat exchanger on its two end surfaces and mounted along the heat exchanger's axis of symmetry. The first and second fans, whose housings are adjacent to the first and second separators respectively, are installed at the ends of the separators facing away from the heat exchanger. The axis of one fan is arranged parallel to, but not coaxially with, the axis of the other fan.

[0012] The disadvantages of this heat recovery air handling unit include a low level of air heat exchange efficiency, low air exchange performance, a heat exchanger design that leads to excessive condensation, and insufficiently efficient condensate removal from the unit, which can lead to the unit freezing during cold seasons.

[0013] A known heat recovery air handling unit [https: / / [www.dimplex.eu / de-de / decentralised-domestic-ventilation-unit-dl-50-wa2#372710], considered the closest analogue, comprises an indoor module, an outdoor module, and a central module. The central module contains a heat recovery unit and fans.

[0014] The disadvantages of the closest analogue are as follows:

[0015] - the central module has a complex design, making maintenance and Difficult unit operation: the fans are not integrated into a fan module;

[0016] - there is no condensate removal system, such as a collection tank condensate, a pump to remove the condensate outside the unit or a drain channel for condensate discharge. This leads to excessive condensate accumulation and potential freezing in countries with cold climates;

[0017] - there is no heating element in the inlet chamber of the pipe intake to preheat the air, which is necessary to prevent condensation;

[0018] - there is no heating element in the outlet chamber of the pipe intake to warm the air, which is used to ensure a comfortable intake air temperature in countries with cold climates;

[0019] - there are no filters, which results in polluted air and insects entering the unit and the premises.

[0020] The objective of the utility model is to create a heat recovery air handling unit, in which:

[0021] - a high level of air heat exchange efficiency is obtained through the placement of a counter-current or cross-current plate heat exchanger in the central module;

[0022] - a high level of air exchange performance is guaranteed due to the structural arrangement of the fans;

[0023] - the mixing of air flows is avoided by means of partitions placed in the central module between the inlet and outlet chambers of the exhaust and intake air ducts;

[0024] - maximum efficient heat transfer from the heating devices is achieved through the complete integration of heating devices in both the inlet and outlet chambers of the intake air duct;

[0025] - an excessive accumulation of condensate and the subsequent freezing of the unit in cold climates are avoided by means of a condensate removal system, namely: a condensate collection tank and a channel to discharge the condensate outside the unit, or a channel to discharge the condensate outside the unit, or a pump to discharge the condensate outside the unit, or a pump and a channel to discharge the condensate outside the unit, or an evaporator;

[0026] - the penetration of polluted air and insects into the unit and the interior space is prevented due to the presence of filters. DISCLOSURE OF THE INVENTION

[0027] The stated objective is achieved as follows. The heat recovery air handling unit comprises an indoor module, an outdoor module, a central module with a plate heat exchanger, fans, an exhaust air duct inlet chamber, an exhaust air duct outlet chamber, an intake air duct inlet chamber, an intake air duct outlet chamber, and a partition between the inlet and outlet chambers of the exhaust and intake air ducts, respectively. In this case, a counterflow or crossflow type heat exchanger is used as the plate heat exchanger, and the fans generate opposing airflows.One fan is positioned in the inlet chamber of the intake air duct, the other fan is positioned in the outlet chamber of the exhaust air duct; or one fan is positioned in the inlet chamber of the exhaust air duct, and the other in the outlet chamber of the intake air duct; or one fan is positioned in the inlet chamber of the exhaust air duct, and the other in the inlet chamber of the intake air duct; or one fan is positioned in the outlet chamber of the intake air duct, and the other in the outlet chamber of the exhaust air duct; and includes a condensate removal system.

[0028] In one embodiment for solving the problem described, the fans in the heat recovery air handling unit can be combined in a ventilation module.

[0029] In a preferred embodiment for solving the problem described, the heat recovery air handling unit includes an inlet chamber of the intake duct which contains a heating device for preheating the air.

[0030] Another embodiment to solve the problem described is that the heat recovery air handling unit includes an outlet chamber of the inlet duct which contains a heating device for post-heating the air.

[0031] The problem described is also solved by the fact that the fans in the heat recovery air handling unit have a mechanical damper and / or a gravity-operated valve.

[0032] According to another embodiment of the solution to the problem described, the housing of the central module in the heat recovery air handling unit has an external thermal insulation envelope.

[0033] The problem described is also solved by the fact that the heat recovery air handling unit has a condensate removal system which includes a condensate collection tank and a channel for discharging the condensate outside the unit.

[0034] The problem described is also solved by the fact that the heat recovery air handling unit has a condensate removal system which includes a channel to discharge the condensate outside the unit.

[0035] Furthermore, the problem described is solved by the fact that the heat recovery air handling unit has a condensate removal system which includes a pump to discharge the condensate outside the unit.

[0036] Another embodiment of the solution to the problem described consists in the heat recovery air handling unit having the condensate removal system include a pump and a discharge channel to discharge the condensate outside the unit.

[0037] Yet another embodiment of the solution to the problem stated is that the heat recovery air handling unit has a condensate removal system which includes a condensate collection tank with an ultrasonic evaporator.

[0038] One embodiment of the solution to the problem stated is that the heat recovery air handling unit has filters placed in the inlet chamber of the exhaust duct and in the inlet chamber of the intake duct.

[0039] Another solution to the problem stated is that the indoor module of the heat recovery air handling unit has an indoor register and / or indoor inlet and exhaust grilles, while the outdoor module has outdoor inlet and exhaust grilles.

[0040] Yet another embodiment of the solution to the problem stated is that the outdoor module of the heat recovery air handling unit has external registers and / or external inlet and outlet grilles, while the indoor module has internal inlet and outlet grilles.

[0041] The problem described is also solved by the fact that one fan and / or the other fan in the heat recovery air handling unit are positioned at an angle with respect to the conditional axis of symmetry of the unit.

[0042] The proposed heat recovery air handling unit differs from the nearest analogue in that it comprises:

[0043] - a counter-current or cross-current plate heat exchanger in the module central, resulting in a high degree of air heat exchange efficiency for the unit;

[0044] - two fans in the central module, positioned either in the inlet chamber of the intake duct and the exhaust duct outlet chamber, or in the exhaust duct inlet chamber and the intake duct outlet chamber, or in the exhaust duct inlet chamber and the intake duct inlet chamber, or in the intake duct outlet chamber and the exhaust duct outlet chamber, contributing to a high degree of air exchange performance.

[0045] - an optimal placement of heating devices in the entrance chamber of the intake duct and intake duct outlet chamber, ensuring maximum efficient heat transfer from the heating devices.

[0046] - a condensate removal system, which prevents excessive accumulation of condensate and subsequent icing of the unit in cold climates.

[0047] - filters, which prevent contaminated air and insects from entering the unit and the local.

[0048] As a result of using the proposed utility model, a heat recovery air handling unit is created, which guarantees a high degree of heat exchange efficiency and a high degree of air exchange performance. DESCRIPTION OF THE FIGURES

[0049] The essence of the utility model is explained by the figures, where:

[0050] [Fig. 1] General view of the heat recovery air handling unit;

[0051] [Fig.2] Schematic representation of the heat recovery air handling unit with parallel arrangement of fans in the inlet chamber of the intake duct and the outlet chamber of the exhaust duct;

[0052] [Fig.3] Schematic representation of the heat recovery air handling unit with parallel arrangement of fans in the exhaust duct inlet chamber and the intake duct outlet chamber;

[0053] [Fig.4] Schematic representation of the heat recovery air handling unit with fans located in the exhaust duct inlet chamber and the intake duct inlet chamber;

[0054] [Fig.5] Schematic representation of the heat recovery air handling unit with fans located in the outlet chamber of the intake duct and the outlet chamber of the exhaust duct;

[0055] [Fig.6] Schematic representation of hot and cold air movement.

[0056] In figures 1 to 6, the following positions are marked: 1 - Heat recovery air handling unit 2 - Interior module 3 - central module 4 - outdoor module 5 - Plate heat exchanger 6 - Exhaust pipe inlet chamber 7 - Exhaust pipe outlet chamber 8 - Inlet chamber of the intake duct 9 - Intake duct outlet chamber 10 - partition 11, 26 - fans 12 - mechanical register 13 - Gravity-operated valve 14 - preheating element 15 - Post-heating element 16 - filter 17 - External thermal insulation envelope 18 - Condensate drain channel 19 - condensate collection tank 20 - ventilation module 21 - Interior intake grille 22 - Inner exhaust grille 23 - Internal register 24 - external intake grille 25 - external exhaust grille 27 - Ultrasonic evaporator 28 - Condensate drain pump 29 - external register. METHODS OF IMPLEMENTATION

[0057] The heat recovery air handling unit (1) consists of an indoor module (2), a central module (3) and an outdoor module (4). The central module (3) is surrounded by an external thermal insulation envelope (17), which is used to reduce heat transfer to the surrounding structures (wall) and improves the acoustic characteristics of the unit (see [Fig. 1]).

[0058] In the heat recovery air handling unit (1), two fans (11) (26) can be combined in a fan module (20). The fans (11) (26) of the heat recovery air handling unit (1) are equipped with a mechanical damper (12) and / or a gravity-operated valve (13).

[0059] The heat recovery air handling unit (1) includes a condensate removal system (18). The condensate removal system includes a condensate collection tank (19) and a discharge channel (18) for discharging the condensate outside the unit (1), or a discharge channel (18) for discharging the condensate outside the unit (1), or a pump (28) for discharging the condensate outside the unit (1), or a combination of a pump (28) and a discharge channel (18) for discharging the condensate outside the unit (1), or a condensate collection tank (19) with an ultrasonic evaporator (27).

[0060] The inlet chamber of the intake duct (8) contains a heating device (14) for preheating the air. This heating device (14) is used to preheat the air to prevent condensation. The outlet chamber of the intake duct (9) contains a heating device (15) for post-heating the air. The post-heating element (15) is used to ensure a comfortable intake air temperature in countries with cold climates.

[0061] The central module (3) contains filters (16) in the exhaust duct inlet chamber (6) and the intake duct inlet chamber (8). These filters (16) are used to protect the counterflow or crossflow plate heat exchanger (5) and the radial fans (11) from contaminated air and insects entering them and the premises. The filters (16) may be treated with an antibacterial agent.

[0062] The inner module (2) has an inner register (23) and / or inner intake grilles (21) and inner exhaust grilles (22), while the outer module (4) has outer intake grilles (24) and outer exhaust grilles (25).

[0063] The outer module (4) has outer registers (29) and / or outer intake grilles (24) and outer exhaust grilles (25), while the inner module (2) has inner intake grilles (21) and inner exhaust grilles (22).

[0064] By plate recuperator (5) is meant a heat exchanger assembly (not shown) consisting of a specific number of thin profiled plates (not shown), which are arranged parallel to each other, forming a single unit with separate airtight channels for the movement of two air flows in opposite directions.

[0065] In [Fig.2] to 6, the movement of hot air (dotted line) and cold air (solid line) through the heat recovery air handling unit (1) is schematically represented.

[0066] The heat recovery air handling unit (1) operates as follows. After the heat recovery air handling unit is switched on, the exhaust and intake fans (11) (26) are activated, initiating air exchange within the unit. The warm exhaust air from the room enters the indoor module (2), flows through the inlet chamber of the exhaust duct (6), and enters the plate heat exchanger (5), where it heats the plate heat exchanger. At the outlet of the plate heat exchanger (5), the air enters the outlet chamber of the exhaust duct (7), where the exhaust fan (26) is located. It then passes through the outdoor module (4) and is discharged to the outside through the exhaust grille (21).

[0067] Simultaneously with the movement of hot air, fresh cold air is brought in. The cold air from outside enters the outdoor module (4) through the supply grille (21), passes through the inlet chamber of the intake duct (8), where the intake fan (11) is located, and enters the plate heat exchanger (5). The cold air entering the plate heat exchanger (5) is heated in the process.

[0068] When it exits the plate recuperator (5), the new but preheated air passes through the outlet chamber of the intake duct (9), then moves through the interior module (2) and enters the premises.

[0069] A partition (10) is placed between the inlet chamber of the intake duct (8) and the outlet chamber of the exhaust duct (7), as well as between the inlet chamber of the exhaust duct (6) and the outlet chamber of the intake duct (9), to prevent the mixing of airflows. As a result of the operation of the heat recovery air handling unit, heat exchange occurs between the hot and cold air, while the airflows do not mix.

[0070] In [Fig. 2], the heat recovery air handling unit (1) is schematically shown with the fans (11) (26) arranged in parallel, located in the inlet chamber of the intake duct (8) and the outlet chamber of the exhaust duct (7), respectively. [Figs. 3] to 5 show other possible fan placement configurations (11) (26), with the heat exchange process operating on the same principle.

[0071] The examples provided are for illustrative purposes only and do not limit the possible implementations of the utility model.

[0072] The operation of the heat recovery air handling unit (1) is carried out using a keypad on the side panel of the unit, via an infrared remote control and via a mobile application on a wireless Wi-Fi network (not shown in the figures and not included in the scope of the patent claims).

[0073] The heat recovery air handling unit (1) is designed so that the indoor module and the central module can be easily detached from the ventilation duct (not shown in the figures), which simplifies maintenance during repair or preventive overhaul.

Claims

Demands

1. A heat recovery air handling unit (1) comprising an indoor module (2), an outdoor module (4), a central module (3) with a plate heat exchanger (5), fans (11) (26), an exhaust duct inlet chamber (6), an exhaust duct outlet chamber (7), an intake duct inlet chamber (8), an intake duct outlet chamber (9), and a partition (10) between the exhaust and intake duct inlet and outlet chambers, respectively, characterized in that the plate heat exchanger (5) is a counterflow or crossflow type heat exchanger, and the fans (11) (26) form opposing airflows, wherein the fan (11) is located in the intake duct inlet chamber (8), and the fan (26) is located in the exhaust duct outlet chamber (7),or the fan (26) is located in the inlet chamber of the exhaust pipe (6), and the fan (11) is located in the outlet chamber of the intake pipe (9), or the fan (26) is located in the inlet chamber of the exhaust pipe (6), and the fan (11) is located in the inlet chamber of the intake pipe (8), or the fan (11) is located in the outlet chamber of the intake pipe (9), and the fan (26) is located in the outlet chamber of the exhaust pipe (7), and further comprising a condensate removal system,

2. Heat recovery air handling unit according to claim 1, characterized in that the fans (11) (26) are combined in a ventilation module (20).

3. Heat recovery air handling unit according to claim 1, characterized in that the inlet chamber of the intake duct (8) contains a heating device (14) for preheating the air.

4. Heat recovery air handling unit according to claim 1, characterized in that the outlet chamber of the inlet duct (9) contains a heating device (15) for post-heating the air.

5. Heat recovery air handling unit according to claim 1, characterized in that the fans (11) (26) are equipped with a mechanical register (12) and / or a gravity-operated valve (13).

6. Heat recovery air handling unit according to claim 1, characterized in that a housing of the central module (3) has an external thermal insulation envelope (17).

7. Heat recovery air handling unit according to claim 1, characterized in that the condensate removal system includes a tank (19) for collecting the condensate and a channel (18) for removing the condensate outside the unit (1).

8. Heat recovery air handling unit according to claim 1, characterized in that the condensate removal system includes a channel (18) for removing the condensate outside the unit (1).

9. Heat recovery air handling unit according to claim 1, characterized in that the condensate removal system includes a pump (28) for removing the condensate outside the unit (1).

10. Heat recovery air handling unit according to claim 1, characterized in that the condensate removal system comprises a pump (28) and a channel (18) for removing the condensate outside the unit (1).

11. Heat recovery air handling unit according to claim 1, characterized in that the condensate removal system includes a container (19) for collecting the condensate with an ultrasonic evaporator (27).

12. Heat recovery air handling unit according to claim 1, characterized in that filters (16) are installed in the inlet chamber of the exhaust duct (6) and in the inlet chamber of the intake duct (8).

13. Heat recovery air handling unit according to claim 1, characterized in that the indoor module (2) has an indoor register (23) and / or grilles (21) (22) for indoor intake and indoor exhaust, and the outdoor module (4) has grilles (24) (25) for outdoor intake and outdoor exhaust.

14. Heat recovery air handling unit according to claim 1, characterized in that the outdoor module (4) has external registers (29) and / or inlet grilles (24) (25) exterior and exterior exhaust, and the interior module (2) has interior intake and interior exhaust grilles (21) (22).

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