HEAT RECOVERY TYPE AIR CONDITIONING UNIT

Abstract

The utility model relates to ventilation equipment, specifically for heating heat recovery type air conditioning units.

Description

2 The observations just mentioned have been known for a long time. This is why, in many developed countries, medical facilities recommend frequent ventilation of premises. Most countries put in place regulations governing air renewal systems. 5 Ventilation is mainly ensured by opening windows, which allows for natural air circulation inside the premises. However, ventilation linked to simply opening windows has many drawbacks. In winter, more precisely, an open window significantly cools the room due to its surface area, while in summer, it leads to overheating. Consequently, considerable energy consumption is required to maintain acceptable and comfortable working and living conditions. Therefore, continuous efforts are being made to develop and improve ventilation systems. A heat recovery air conditioning unit is wellknown [Patent U An°146223F24F7 / 00, F28F13 / 14 dated 27 January 2021] includes a recuperator equipped with air ducts, a fan and a heat exchanger, which are linked to each other and mounted between the external and internal surfaces of the wall of a part. 20 Two concentric cylinders with direct passage are installed in the opening between the external and internal surfaces of the part, and between the two, on the external surface of the internal cylinder, a corrugated heat exchanger in the shape of Ω (in cross-section) is fixed. Furthermore, on the internal surface of the cylinder, external and internal fans are installed opposite each other. The unit openings are fitted with corresponding external and internal covers, the internal cover being equipped with a grille for the supply air and an outlet slot for the internal air, which includes an air diffuser. BE2025 / 7011 3 The external cover is also equipped with an opening for the condensate drain, which extends beyond the plane of the external wall surface, an air intake grille, and a corresponding grille forInternal air exhaust. The disadvantages of this heat recovery air conditioning unit (HVAC unit) include a low degree of efficiency of the air-to-air heat exchanger. When air passes along the heat exchange surface of the corrugated heat exchanger, the presence of cutouts in the heat exchanger recesses reduces the heat exchange area. The low level of performance regarding air renewal is due to the fact that the airflow within the unit is not balanced. Another disadvantage lies in the lack of load resistance due to the canopy. Since the external module is of the open type, it offers no wind protection for the exhaust duct, which risks causing the unit to freeze at sub-zero temperatures. Given that it is structurally impossible to install heaters and filter elements in the full sense of the term, and that the power supply unit is located within the room module, it follows that no additional heating of the heat recovery unit is planned. The design of 20The heat exchanger causes excessive condensation and may eventually lead to the unit freezing. A well-known heat recovery air conditioning unit [patent application no. EP4417886A1F24F12 / 00;F24F7 / 08; F28D21 / 00;F28F9 / 02;dated August 21, 2024] is designed to be installed in an exterior wall of a building. The unit comprises an internal module and an adjacent heat exchange module, which consists of a corrugated cylindrical heat exchanger equipped with a multitude of air channels for heat exchange arranged along the axis of symmetry of the heat exchanger.30 BE2025 / 7011 4 These air channels have identical cross-sections and are adjacent to each other, forming a continuous corrugated volume of heat exchange segments. The first and second separators are provided to separate and direct the airflows stale and supply air in opposite directions inside the 5 channels for air for heat exchange purposes.The first and second separators are fixed to the heat exchanger on its two terminal surfaces and are mounted along the axis of symmetry of this heat exchanger. The first and second fans, whose casings are adjacent to the first and second separators respectively, are mounted at the ends of the separators, which are turned away from the heat exchanger. The axis of one of the fans is arranged parallel to the axis of the other fan, but without being coaxial with said axis. The disadvantages associated with this heat recovery air conditioning unit include low air heat exchange efficiency, poor air renewal performance, a heat exchanger design that leads to excessive condensation, and insufficient condensate removal from the unit, which can cause the unit to freeze during cold seasons. A well-designed heat recovery air conditioning unitThe unit known [https: / / www.dimplex.eu / de-de / decentralised-domestic-ventilation-unit-dl-50-wa2#372710], considered the closest analogue, comprises an internal module, an external module, and a central module. The central module contains a heat recovery unit and fans. The disadvantages of the closest analogue are as follows: - the design of the central module is complex, which makes maintenance and operation of the unit difficult: the fans are not integrated into a ventilation module; BE2025 / 7011 5 - There is no condensate removal system, such as a condensate collection tank, a pump to remove the condensate from the unit, or a condensate drain. This deficiency leads to excessive condensate accumulation and a risk of freezing in cold climates; 5 - There is no heating element in the inlet chamber of the intake duct for preheating the air, which is necessary to prevent condensation; - There is no heating element in the outlet chamber of the ductintake for air heating, which is used to guarantee a comfortable intake air temperature in cold climates; - there are no filters, which leads to the penetration of polluted air and insects into the unit and the premises. The purpose of the utility model is to create a Heat Recovery Air Conditioning Unit, in which: - a high level of air-heat exchange efficiency is obtained by placing a counterflow or crossflow plate heat exchanger in the central module; - a high level of air renewal performance is guaranteed through the structural arrangement of the fans; - Mixing of airflows is prevented by means of partition walls placed in the central module between the inlet and outlet chambers of the ducts for stale air and for intake air; 25 BE2025 / 7011 6 - Maximum efficient heat transfer from the heaters is obtained by fully integrating the heaters into theinlet chamber and in the outlet chamber of the air intake duct; -excessive accumulation of condensate and freezing of unit 5 which results in cold climates is avoided by means of a condensate removal system, more precisely: a condensate recovery tank and a duct intended to discharge the condensate outside the unit, or a duct intended to discharge the condensate outside the unit, or a pump intended to discharge the condensate outside the unit, or a pump and a duct intended to discharge the condensate outside the unit, or an evaporator; -due to the presence of filters, the entry of polluted air and insects into the unit and the interior space is prevented. The object indicated is implemented in the following manner. The 15-unit heat recovery air conditioning unit comprises an internal module, an external module, a central module equipped with a plate heat exchanger, fans, a stale air duct inlet chamber, a stale air duct outlet chamber, a supply air duct inlet chamber, and a 20-unit outlet chamber.duconduit pour l’air intake et une paroidesepartition entre les chambers de l’inlet et de outlet des ducts pour l’air stale et l’air intake, respectively.In the present case, a recuperator of the counterflow or crossflow type is used to act as a plate recuperator, and the fans generate opposing airflows. BE2025 / 7011 7 One fan is positioned in the inlet chamber of the duct for intake air and the other fan is positioned in the outlet chamber of the duct for exhaust air; or one fan is positioned in the inlet chamber of the duct for exhaust air and the other is positioned in the outlet chamber of the duct for intake air; or one fan is positioned in the inlet chamber of the duct for exhaust air and the other is positioned in the inlet chamber of the duct for intake air; or one fan is positioned in the outlet chamber of the duct for intake air and the other is positioned in the outlet chamber of the duct for exhaust air; and it includes a condensate drainage system. 10In one embodiment intended to solve the aforementioned problem, the fans in the heat recovery air conditioning unit can be combined to obtain a single ventilation module. In a preferred embodiment intended to solve the aforementioned problem, the heat recovery air conditioning unit has an inlet chamber of the intake duct, which contains a heater for preheating the air. In another embodiment intended to solve the aforementioned problem, the heat recovery air conditioning unit has an outlet chamber of the intake duct, which contains a heater for further heating of the air. The problem in question is also solved by the fact that the fans in the heat recovery air conditioning unit have a mechanical air flap and / or a gravity-operated valve 25. According to another embodiment concerning the solution of theThe problem mentioned is that the central module housing in the heat recovery air conditioning unit has an external casing that provides thermal insulation. 30 BE2025 / 7011 8 The problem mentioned is also resolved by the fact that the heat recovery air conditioning unit has a condensate removal system that includes a condensate recovery tank and a channel intended to discharge the condensate outside the unit. 5 The problem mentioned is also resolved by the fact that the heat recovery air conditioning unit has a condensate removal system that includes a channel intended to discharge the condensate outside the unit. Furthermore, the problem that has been mentioned is also resolved by the fact that the heat recovery air conditioning unit has a condensate removal system which includes a pump for removing the condensate from the unit. Another form of implementation of the solution to the problem that has beenThe aforementioned solution involves ensuring that, in the Heat Recovery Air Conditioning Unit 15, the condensate removal system includes a pump and a drain duct designed to discharge the condensate outside the unit. Another embodiment of the solution to the aforementioned problem lies in the fact that the Heat Recovery Air Conditioning Unit 20 has a condensate removal system that includes a condensate recovery tank comprising an ultrasonic evaporator. A further embodiment of the solution to the aforementioned problem lies in the fact that the Heat Recovery Air Conditioning Unit 25 has filters located in the inlet chamber of the exhaust duct and in the inlet chamber of the intake duct. BE2025 / 7011 9 Another solution to the problem that has been mentioned lies in the fact that the internal module of the heat recovery air conditioning unit has an internal air flap and / or intake grillesinternal and internal exhaust grilles, while the external module has external inlet grilles and external exhaust grilles. Another form of implementation of the solution to the problem that has been mentioned lies in the fact that the external module of the heat recovery air conditioning unit has external air flaps and / or external inlet grilles and external exhaust grilles, while the internal module has internal inlet grilles and internal exhaust grilles. The problem mentioned is also solved by the fact that one or more of the fans in the heat recovery air conditioning unit is positioned at an angle to the unit's conditional axis of symmetry. The proposed heat recovery air conditioning unit differs from the closest analogue in the following characteristics, namely: a counterflow plate heat exchanger orcross flow in the central module, which allows a high degree of air-heat exchange efficiency for the unit; BE2025 / 7011 10 - two fans in the central module, which are positioned either in the inlet chamber of the intake duct and in the outlet chamber of the exhaust duct; or in the inlet chamber of the exhaust duct and in the outlet chamber of the intake duct; or in the inlet chamber of the exhaust duct and in the inlet chamber of the intake duct; or in the outlet chamber of the intake duct and in the outlet chamber of the exhaust duct, thus contributing to a high degree of air renewal performance; -optimal placement of heaters in the inlet chamber of the intake duct and in the outlet chamber of the intake duct, which guarantees maximum efficiency for heat transfer from the heaters; -a condensate removal system, which prevents excessive accumulation of condensate and, consequently, freezing of the unit in cold climates;-filters that prevent polluted air and insects from entering the unit and the premises. Thanks to the use of the proposed utility model, a heat recovery air conditioning unit is created that guarantees a high degree of heat exchange efficiency and a high degree of air renewal performance. The essentials of the utility model are explained by the figures, in which: Figure 1 represents a general view of the heat recovery air conditioning unit; Figure 2 is a schematic representation of the heat recovery air conditioning unit which includes a parallel arrangement of fans in the inlet chamber of the intake duct and in the outlet chamber of the exhaust duct; BE2025 / 7011 11 Figure 3 is a schematic representation of the heat recovery air conditioning unit which includes a parallel arrangement of fans in the exhaust duct inlet chamber and in the intake duct outlet chamber; the figureFigure 4 is a schematic representation of the heat recovery type air conditioning unit 5 which includes fans which are arranged in the inlet chamber of the exhaust duct and in the inlet chamber of the intake duct; Figure 5 is a schematic representation of the heat recovery type air conditioning unit which includes fans which are arranged in the outlet chamber 10 of the intake duct and in the outlet chamber of the exhaust duct; Figure 6 is a schematic representation of the movement of hot and cold air. Figures 1 to 6 indicate the following positions: 1-Heat Recovery Air Conditioning Unit 15 2-Internal module 3-Central module 4-External module 5-Plate heat exchanger 6-Exhaust duct inlet chamber 20 7-Exhaust duct outlet chamber 8-Inlet duct inlet chamber 9-Inlet duct outlet chamber 10-Separation walls 11, 26-Fans 25 12-Mechanical air damper 13-Gravity-operated valve14-pre-heating element BE2025 / 7011 12 15-rear heating element 16-filter 17-external thermal insulation casing 18-condensate drain channel 19-condensate collection tank 5 20-ventilation module 21-internal inlet grille 22-internal outlet grille 23-internal air damper 24-external inlet grille 10 25-external outlet grille 27-ultrasonic evaporator 28-condensate drain pump 29-textile air damper. The heat recovery air conditioning unit (1) is 15 comprised of an internal module (2), a central module (3), and an external module (4). The central module (3) is surrounded by an external thermal insulation envelope (17) which is used to reduce heat transfer to surrounding structures (walls) and improve the acoustic characteristics of the unit (see Figure 1). 20 In the heat recovery air conditioning unit (1), two fans (11)(26) can be combined to obtain a ventilation module (20). The fans (11)(26) of the air conditioning unitHeat recovery air conditioning units (1) are equipped with a mechanical air damper (12) and / or a gravity-operated valve (13). 25 BE2025 / 7011 13 The heat recovery air conditioning unit (1) includes a condensate removal system (18). The condensate removal system includes a condensate recovery tank (19) and a drain pipe (18) for discharging the condensate outside the unit (1) or a drain pipe (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 drain duct (18) for evacuating the condensate outside the unit (1), or a condensate recovery tank (19) equipped with an ultrasonic evaporator (27). 10 The inlet chamber of the inlet duct (8) contains a heater (14) for preheating the air. This heater (14) is used for preheating the air in order to combat condensation. The outlet chamber of the inlet duct (9) contains a heater (15)for subsequent air heating. The subsequent heating element (15) is used to ensure a comfortable intake air temperature in cold climates. The central module (3) contains filters (16) in the inlet chamber of the intake duct (6) and in the inlet chamber of the intake duct (8). These filters (18) are used to provide protection against the entry of stale air and insects into the counterflow or crossflow plate heat exchanger (5) and radial fans (11), as well as into rooms. The filters (16) can be treated with an antibacterial agent. The internal module (2) has an internal air damper (23) and / or internal inlet grilles (21) and internal outlet grilles (22), while the external module (4) has external inlet grilles (24) and external outlet grilles (25). BE2025 / 7011 14 The external module (4) has external air damper(29) and / or external inlet grilles (24) and external outlet grilles(25), while the internal module (2) has internal inlet grilles (21) and internal outlet grilles (22). The term "plate heat exchanger (5)" refers to a package (5) of heat exchangers (not shown) consisting of a specific number of thin profiled plates (not shown), which are arranged parallel to each other to form a compact package which includes separate airtight channels intended for the movement of two air streams in opposite directions. 10 Figures 2 to 6 schematically represent the movement of hot air (lined line) and cold air (solid line) through the heat recovery air conditioning unit (1). The heat recovery air conditioning unit (1)15 operates as described below. As soon as the heat recovery air conditioning unit is switched on, the exhaust and intake fans (11)(26) are activated, which triggers air renewal within the unit. The stale, hot air coming fromThe air from the room enters the internal module (2), flows through the inlet chamber of the exhaust duct (6) and enters the plate heat exchanger (5) which it heats. Upon exiting 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 external module (4) and is exhausted outside, obstructing the exhaust grille (21). Simultaneously with the movement of hot air, fresh cold air is supplied. The cold air from outside enters the external module (4) through the supply grille (21), passes through the inlet chamber of the intake duct (8), in which the fan (11) is located, and enters the plate heat exchanger (5). BE2025 / 7011 15 The cold air entering the plate heat exchanger (5) is heated in the process. Upon exiting the plate heat exchanger (5), the fresh, but preheated, air passes through the outlet chamber of the intake duct (9), can then move through the internal module (2) and enter the room.A separation wall (10) is placed between the inlet chamber of the intake duct (8) and the outlet chamber of the exhaust duct (7), and also between the inlet chamber of the exhaust duct (6) and the outlet chamber of the intake duct (9) in order to prevent the mixing of the airflows. Thanks to the operation of the Heat Recovery Air Conditioning Unit 10, heat exchange is obtained between the hot air and the cold air, while the airflows do not mix. Figure 2 schematically represents the heat recovery air conditioning unit (1) in which the fans (11)(26) are arranged in a parallel configuration, located in the inlet chamber of the intake duct (8) and in the outlet chamber of the exhaust duct (7), respectively. Figures 3 to 5 show other possible configurations of fan placement (11)(26), it being understood that the process is carried out in accordance with the same principle. The examples provided are for illustrative purposes only and are notin no way limit the possible embodiments of the utility model. The operation of the heat recovery type air conditioning unit (1) is implemented using a keypad on the parallel side of the unit, via an infrared remote control, and via a mobile application that uses a Wi-Fi wireless network (which is not shown in the figures and is not part of the scope of the patent claims). 30 BE2025 / 7011 16 The heat recovery type air conditioning unit (1) is designed in such a way that the internal module and the central module can be easily disconnected from the ventilation duct (not shown in the