Ventilation with recovery is equipment designed to process air to such parameters that a person could feel comfortable and safe. Such parameters are regulated by standards and lie within the following limits: temperature 23÷26 C, humidity 30÷60%, air speed 0.1÷0.15 m/s.

There is another indicator that is directly related to the safety of a person’s presence in indoors- this is the presence of oxygen, or more precisely, the percentage of carbon dioxide in the air. Carbon dioxide displaces oxygen and, at levels of 2 to 3% carbon dioxide in the air, can cause loss of consciousness or death.

It is to maintain these four parameters that the ventilation units with recovery. This is especially true for modern business centers, where there is no natural influx fresh air. Industrial, administrative, commercial, residential, and other premises cannot do without modern ventilation equipment. With today's air pollution, the issue of installing ventilation units with recovery is most relevant.

It is possible to install additional filters and other devices in ventilation with recovery that allow you to even better clean and process the air to the specified parameters.

All this can be done using Dantex ventilation units.

Operating principle of a supply and exhaust ventilation system with heat recovery

Thanks to the supply and exhaust ventilation system, the room is pumped fresh air, and the heated exhaust air is discharged outside. Passing through the heat exchanger, the heated air leaves part of the heat to the walls of the structure, as a result of which cold air, coming from the street, is heated by the heat exchanger without spending additional energy on heating. This system is more efficient and less energy-consuming than a ventilation system without heat recovery.

The efficiency of the recuperator varies depending on the outside air temperature; it can be calculated using the general formula:

S = (T1 – T2) : (T3 – T2)
Where:

S– recovery efficiency;
T1– temperature of the air entering the room;
T2– air temperature outside;
T3– room air temperature.

Types of recuperators

Plate recuperators

This type of heat exchanger consists of a set of thin plates made of aluminum or any other material, preferably with good heat transfer characteristics). This is the cheapest and most popular type of device (recuperator). The efficiency of a plate recuperator can range from 50% to 90%, and the service life, due to the absence of moving parts, is very long.

The main disadvantage of such recuperators is the formation of ice due to temperature differences. There are three options for solving this problem:

• Do not use recovery under extreme conditions low temperatures
• Use models with an automated recovery process. In this case, cold air bypasses the plates, and warm air warms the ice. But it is worth considering that the efficiency of such models in cold weather will decrease by 20%.

Rotary recuperators

The heat exchanger has a moving part - a cylindrical rotor (recuperator), which consists of profiled plates. Heat transfer occurs when the rotor rotates. Efficiency ranges from 75 to 90%. In this case, the rotation speed affects the level of recuperation. The speed can be adjusted independently.

Ice does not form on rotary heat exchangers, but they are more difficult to maintain, unlike plate heat exchangers.

With intermediate coolant

In case of intermediate coolant, as in plate recuperators, there are two channels for clean and exhaust air, but heat exchange occurs through a water-glycol solution or water. The efficiency of such a device is below 50%.

Chamber recuperators

In this form, the air passes through a special chamber (recuperator), which contains a movable damper. It is the damper that has the ability to redirect the flow of cold and hot air. Due to such periodic switching of air flows, recuperation occurs. However, in such a system there is a partial mixing of outgoing and incoming air flows, which leads to the entry of foreign odors back into the room, but, in turn, this design has a high efficiency of 80%.

Heat pipes

This mechanism has many tubes, which are assembled into a single sealed block, and inside the tubes are filled with a special easily condensing and evaporating substance, most often freon. Warm air, passing through a certain part of the tubes, heats and evaporates it. It moves into the area of ​​the tubes through which cold air passes and heats it with its heat, while the freon cools and this can lead to the formation of condensation. The advantage of this design is that polluted air does not enter the room. Optimal use of heat pipes is possible in small rooms V climatic zones with a small difference between internal and external temperatures.

Sometimes recovery is not enough to heat the room at low outside temperatures, so electric or water heaters are often used in addition to recovery. In some models, heaters perform the function of protecting the heat exchanger from icing.

Price: 25,500 RUR

Installations with recovery and plate heat exchanger, Mitsubishi LOSSNEY are designed for air exchange and maintaining relative humidity in small rooms for various purposes. Made in Japan.

Air consumption - from 55 to 100 m3/hour.

Price: 62,600 RUR

Series air handling units with heat recovery, Daikin ( VAM-150F,VAM-250F, VAM-350FB, VAM-500FB, VAM-650FB, VAM-800FB, VAM-1000FB, VAM-1500FB, VAM-2000FB), designed for air exchange, energy saving and maintaining relative humidity in premises for various purposes. They are suitable for country houses, cottages, apartments and commercial premises. Basic distinctive feature DAIKIN installations are characterized by high efficiency and low power consumption. These ventilation units can work either independently or as part of VRV air conditioning systems, as well as in conjunction with air humidifiers.

Air consumption - from 150 to 2000 m3/hour.

Price: 51,500 RUR

A series of air handling units with plate recuperator, Mitsubishi LOSSNEY ( LGH-15RX5ELGH-5E, LGH-25RX5ELGH-5E, LGH-35RX5ELGH-5E, LGH-50RX5ELGH-5E, LGH-65RX5ELGH-5E, LGH-80RX5ELGH-5E, LGH-100RX5ELGH-5E), designed for air exchange, energy saving and maintaining relative humidity in premises for various purposes. They are perfect for country houses, cottages, apartments and commercial premises. The main distinguishing feature of LOSSNEY installations is their high efficiency and low power consumption. Made in Japan.

Air consumption - from 100 to 1000 m3/hour.

Price: 29,500 RUR

Series of installations inflow recuperative ventilation, Electrolux ( EPVS-200, EPVS-300, EPVS-450, EPVS-650, EPVS-1100, EPVS-1300), designed for air exchange, energy saving and maintaining relative humidity in premises for various purposes. They are perfect for country houses, cottages, apartments and commercial premises. The main distinguishing feature of Electrolux STAR installations is their high efficiency of up to 90% and low power consumption.

Air consumption - from 200 to 1300 m3/hour.

Price: 131,000 RUR

A series of supply and exhaust ventilation units with plate recuperator, TURKOV ZENIT ( 200 heco, 350 heco, 450 heco, 550 heco), designed for ventilation, energy saving and maintaining relative humidity in rooms for various purposes. They are perfect for country houses, cottages, apartments and commercial premises. TURKOV air handling units with heat recovery have the ability to connect a 1.5 kW electric heater, which allows you to regulate the temperature of the incoming air into the room.
Management by WI-FI And MODBAS with a smart home system.

Air consumption - from 200 to 550 m 3 /hour.

Price: 29,400 RUR

A series of supply and exhaust ventilation units with plate recuperator, Dantex DV ( DV-200HRE, DV-250HRE, DV-350HRE, DV-400HRE, DV-500E, DV-600HRE, DV-800HRE, DV-1000HRE, DV-1200HRE), designed for ventilation, energy saving and maintaining relative humidity in rooms for various purposes. They are perfect for country houses, cottages, apartments and commercial premises. Dantex air handling units with heat recovery allow you to regulate the temperature of the incoming air into the room and have low power consumption.

Air consumption - from 150 to 1200 m3/hour.

Price: 36,500 RUR

A series of air handling units with heat recovery, Royal Clima ( RCS 350, RCS 500, RCS 650, RCS 950, RCS 1350, RCS 1500), designed for air exchange, energy saving and maintaining relative humidity in premises for various purposes. High efficiency and low power consumption.

Air consumption - from 330 to 1500 m3/hour.

Price: 87,900 RUR

WITH rotary recuperator heat, UNI ( Norway) are intended for ventilation and energy saving in the premises of country houses, cottages, apartments. The main distinctive feature of the installations is built-in electric air heater allowing you to regulate the temperature of the exhaust air into the room, low power consumption and a wide range of operating temperatures. Supply and exhaust UNI installations can be connected to the system " Smart House"via MODBUS protocol.

Air consumption - up to 720 m3/hour.

Recovery in ventilation plays an important role, as it allows you to increase the efficiency of the system due to design features. There are different designs of recovery units, each of which has its own pros and cons. The choice of supply and exhaust ventilation system depends on what problems are being solved, as well as on the climatic conditions of the area.

Design features, purpose

Recovery in ventilation is quite new technology. Its action is based on the ability to use the removed heat to heat the room. This happens thanks to separate channels, so air currents do not mix with each other. The design of recuperative units can be different; some types avoid the formation of condensation during the heat transfer process. The performance level of the system as a whole also depends on this.

Ventilation with heat recovery can produce high efficiency during operation, which depends on the type of heat recovery unit, the speed of air flow through the heat exchanger and how large the difference between the temperature outside and inside the room is. The efficiency value in some cases, when the ventilation system is designed taking into account all factors and has high performance, can reach 96%. But even taking into account the presence of errors in the operation of the system, the minimum efficiency limit is 30%.

The goal of the regenerative unit is to maximize efficient use ventilation resources to further ensure sufficient air exchange in the room, as well as energy savings. Taking into account the fact that the supply exhaust ventilation with recovery operates most of the day, and also, taking into account that ensuring a sufficient frequency of air exchange requires considerable equipment power, the use of a ventilation system with a built-in recovery unit will help save up to 30% of electricity.

The disadvantage of this technique can be called quite low efficiency when installed on large areas. In this case, electricity consumption will be high, and the performance of the system aimed at heat exchange between air flows may be noticeably lower than the expected limit. This is explained by the fact that air exchange occurs much faster in small areas than in large objects.

Types of recuperative units

There are several varieties used in ventilation system equipment. Each of the options has advantages and disadvantages, which must be taken into account even when forced ventilation with recovery is just being designed. There are:

1. Recuperator plate mechanism. It can be made on the basis of metal or plastic plates. Along with fairly high performance (efficiency is 75%), such a device is susceptible to icing due to the formation of condensation. The advantage is the absence of moving structural elements, which increases the service life of the device. There is also a plate type of recuperative unit with moisture-permeable elements, which eliminates the possibility of condensation. A feature of the plate design is that there is no possibility of mixing two air flows.

1. Ventilation systems with heat recovery can operate on the basis of a rotor mechanism. In this case, heat exchange between air flows occurs due to the operation of the rotor. The productivity of this design increases to 85%, but there is a possibility of air mixing, which can bring odors back into the room that are removed outside the room. The advantages include the ability to additionally dry air environment, which allows the use of equipment of this type in premises special purpose with an increased level of importance, for example in swimming pools.
2. The chamber mechanism of the recuperator is a chamber that is equipped with a movable damper, which allows odors and contaminants to penetrate back into the room. However this type The design is very productive (efficiency reaches 80%).
3. Recuperative unit with intermediate coolant. In this case, heat exchange occurs not directly between two air flows, but through a special liquid (water-glycol solution) or plain water. However, a system based on such a node has low performance (efficiency below 50%). A recuperator with an intermediate coolant is almost always used to organize ventilation in production.
4. Regenerative unit based on heat pipes. This mechanism works using freon, which tends to cool, which leads to the formation of condensation. The performance of such a system is at an average level, but the advantage is that there is no possibility of odors and contaminants penetrating back into the room. Ventilation in an apartment with recuperation will be very effective due to the fact that it is necessary to maintain relatively small area. To be able to operate such equipment without negative consequences for it, it is necessary to select a model based on a recuperative unit, which eliminates the possibility of condensation. In places with a fairly mild climate, where the air temperature outside does not reach critical levels, the use of almost any type of recuperator is allowed.

Recuperators

Supply and exhaust ventilation- This A complex approach to the problem of ventilation.

Supply and exhaust units provide an active flow of fresh air into the room and removal of exhaust air masses from the room. Recuperators are becoming increasingly popular, the advantage of which is the supply of fresh air heated to room temperature, with minimal annual energy consumption.

Recuperators return up to 95% of the heat back to the room, creating virtually no additional energy costs. Thus, recuperators are the most economical view ventilation unit supplying warm air to the room. This is achieved by retaining heat from waste room air on heat exchangers.

The latest models of recuperators combine the functions supply and exhaust ventilation and fine air purification from allergens, are equipped with carbon dioxide sensors, specially designed heat exchangers to maintain optimal humidity conditions, and the ability to control from a smartphone.

Installing a recuperator effectively helps to cope with stuffiness, control room humidity, mold and dampness in the house, and condensation on plastic windows.

We are official dealer leading manufacturers, and we can provide a guarantee best price. From us you can choose and buy any model of recuperator with delivery throughout Moscow and Russia.

Supply and exhaust ventilation units with heat recovery appeared relatively recently, but quickly gained popularity and became a fairly popular system. The devices are capable of fully ventilating the room in cold period, while maintaining optimal temperature regime incoming air.

What it is?

When using supply and exhaust ventilation in the autumn-winter period, the question of preserving heat in the room often arises. The flow of cold air coming from the ventilation rushes to the floor and contributes to the creation of an unfavorable microclimate. The most common way to solve this problem is to install a heater that heats the flow of cold street air before supplying it to the room. However this method is quite energy-consuming and does not prevent heat loss in the room.

The best option The solution to the problem is to equip the ventilation system with a recuperator. The recuperator is a device in which the air outflow and supply channels are located in close proximity to each other. The recuperation unit allows partial transfer of heat from the air leaving the room to the incoming air. Thanks to the technology of heat exchange between multidirectional air flows, it is possible to save up to 90% of energy, in addition, summer period the device can be used to cool incoming air masses.

Specifications

The heat recuperator consists of a housing, which is covered with heat and sound insulating materials and is made of sheet steel. The device body is quite durable and can withstand weight and vibration loads. The housing has inflow and outflow openings, and air movement through the device is ensured by two fans, usually of an axial or centrifugal type. The need to install them is due to a significant slowdown natural circulation air, which is caused by high aerodynamic drag recuperator. To prevent the suction of fallen leaves, small birds or mechanical debris, an air intake grille is installed on the inlet located on the street side. The same opening, but on the room side, is also equipped with a grille or diffuser that evenly distributes air flows. When installing branched systems, air ducts are mounted to the openings.

In addition, the inlets of both flows are equipped with fine filters that protect the system from dust and grease droplets. This protects the heat exchanger channels from clogging and significantly extends the service life of the equipment. However, the installation of filters is complicated by the need to constantly monitor their condition, clean them, and, if necessary, replace them. Otherwise, a clogged filter will act as a natural barrier to air flow, causing resistance to increase and the fan to break.

According to the type of design, recuperator filters can be dry, wet or electrostatic. The choice of the desired model depends on the power of the device, physical properties And chemical composition exhaust air, as well as the personal preferences of the buyer.

In addition to fans and filters, recuperators include heating elements, which can be water and electric. Each heater is equipped with a temperature relay and is capable of automatically turning on if the heat leaving the house cannot cope with heating the incoming air. The power of the heaters is selected in strict accordance with the volume of the room and the operating performance of the ventilation system. However, in some devices, heating elements only protect the heat exchanger from freezing and do not affect the temperature of the incoming air.

Water heater elements are more economical. This is explained by the fact that the coolant that moves along the copper coil enters it from the heating system of the house. The coil heats the plates, which, in turn, give off heat to the air flow. The water heater regulation system is presented three-way valve, opening and closing the water supply, a throttle valve that reduces or increases its speed, and mixing unit regulating temperature. Water heaters are installed in an air duct system with a rectangular or square cross-section.

Electric heaters are often installed on air ducts with round, and their heating element is a spiral. For correct and efficient work spiral heater, the air flow speed should be greater than or equal to 2 m/s, the air temperature should be 0-30 degrees, and the humidity of the passing masses should not exceed 80%. All electric heaters are equipped with an operation timer and a thermal relay that turns off the device if it overheats.

In addition to the standard set of elements, at the request of the consumer, air ionizers and humidifiers are installed in recuperators, and most modern designs equipped with an electronic control unit and a function for programming the operating mode, depending on external and internal conditions. The instrument panels are aesthetically pleasing appearance, allowing recuperators to fit organically into the ventilation system and not disturb the harmony of the room.

Principle of operation

In order to better understand how the recuperative system works, you should refer to the translation of the word “recuperator”. Literally it means “return of used”, in this context – heat exchange. In ventilation systems, the recuperator takes heat from the air leaving the room and transfers it to incoming air flows. The temperature difference between multidirectional air jets can reach 50 degrees. IN summer time The device works in reverse and cools the air coming from the street to the temperature of the outlet. On average, the efficiency of devices is 65%, which allows rational use energetic resources and save significantly on electricity.

In practice, heat exchange in a recuperator looks like this: forced ventilation drives an excess volume of air into the room, as a result of which contaminated masses are forced to leave the room through the exhaust duct. Coming out warm air passes through the heat exchanger, heating the walls of the structure. At the same time, a flow of cold air moves towards it, which takes away the heat received by the heat exchanger without mixing with the exhaust flows.

However, cooling the air leaving the room leads to the formation of condensation. If the fans work well, imparting high speed to the air masses, the condensate does not have time to fall onto the walls of the device and goes out into the street along with the air stream. But if the air speed was not high enough, then water begins to accumulate inside the device. For these purposes, the design of the recuperator includes a tray, which is located at a slight inclination towards the drain hole.

Through the drain hole, water enters a closed tank, which is installed on the side of the room. This is dictated by the fact that accumulated water can freeze the outflow channels and the condensate will have nowhere to drain. Use collected water not recommended for humidifiers: the liquid may contain a large number of pathogenic microorganisms, and therefore must be poured into the sewer system.

However, if ice still forms from condensation, it is recommended to install additional equipment– bypass. This device is made in the form of a bypass channel through which supply air will enter the room. As a result, the heat exchanger does not heat the incoming flows, but spends its heat exclusively on melting the ice. The incoming air, in turn, is heated by a heater, which turns on synchronously with the bypass. After all the ice has been melted and the water has been drained into storage tank, the bypass is turned off and the recuperator begins to operate normally.

In addition to installing a bypass, hygroscopic cellulose is used to combat icing. The material is located in special cassettes and absorbs moisture before it has time to fall into condensation. Moisture vapor passes through the cellulose layer and returns to the room with the incoming flow. The advantages of such devices are simple installation, the optional installation of a condensate collector and storage tank. In addition, the operating efficiency of cellulose recuperator cassettes does not depend on external conditions, and the efficiency is more than 80%. The disadvantages include the inability to use in rooms with excess humidity and the high cost of some models.

Types of recuperators

The modern ventilation equipment market represents wide choose recuperators different types, differing from each other both in design and in the method of heat exchange between flows.

• Plate models are the simplest and most common type of recuperator, characterized by low cost and long service life. The heat exchanger of the models consists of thin aluminum plates, which have high thermal conductivity and significantly increase the efficiency of the devices, which in plate models can reach 90%. High efficiency indicators are due to the peculiarity of the structure of the heat exchanger, the plates in which are located in such a way that both flows, alternating, pass between them at an angle of 90 degrees to each other. The sequence of passing warm and cold jets was made possible by bending the edges on the plates and sealing the joints using polyester resins. In addition to aluminum, alloys of copper and brass, as well as polymer hydrophobic plastics, are used to produce plates. However, in addition to advantages, plate recuperators also have their own weak sides. The downside of the models is the high risk of condensation and ice formation, which is due to the plates being too close to each other.

• Rotary models consist of a housing inside which a cylindrical rotor consisting of profiled plates rotates. During rotation of the rotor, heat is transferred from the outgoing flows to the incoming ones, as a result of which a slight mixing of the masses is observed. And although the mixing rate is not critical and usually does not exceed 7%, such models are not used in children's and medical institutions. The level of air mass recovery depends entirely on the rotor rotation speed, which is set manually. The efficiency of rotary models is 75-90%, the risk of ice formation is minimal. The latter is due to the fact that most of the moisture is retained in the drum and then evaporates. The disadvantages include difficulty in maintenance, high noise load, which is due to the presence of moving mechanisms, as well as the size of the device, the impossibility of installing on a wall and the likelihood of the spread of odors and dust during operation.

• Chamber models consist of two chambers, between which there is a common damper. After warming up, it begins to turn and let cold air into warm chamber. Then the heated air goes into the room, the damper closes and the process repeats again. However, the chamber recuperator has not gained wide popularity. This is due to the fact that the damper is not able to ensure complete sealing of the chambers, so the air flows are mixed.

• Tubular models consist of large quantity tubes containing freon. During the heating process from the outgoing flows, the gas rises to the upper sections of the tubes and heats the incoming flows. After heat transfer occurs, freon takes on a liquid form and flows into the lower sections of the tubes. The advantages of tubular recuperators include a fairly high efficiency, reaching 70%, the absence of moving elements, the absence of hum during operation, small size and long term services. Disadvantages are considered heavy weight models, which is due to the presence of metal pipes in the design.

• Models with intermediate coolant consist of two separate air ducts passing through a heat exchanger filled with a water-glycol solution. As a result of passing through the heating unit, the exhaust air transfers heat to the coolant, which, in turn, heats the incoming flow. The advantages of the model include its wear resistance, due to the absence of moving parts, and among the disadvantages are low efficiency, reaching only 60%, and a predisposition to condensation formation.

How to choose?

Thanks to the wide variety of recuperators presented to consumers, choose the desired model won't be difficult. Moreover, each type of device has its own narrow specialization and recommended installation location. So, when purchasing a device for an apartment or private house, it is better to choose a classic plate model with aluminum plates. Such devices do not require maintenance, do not require regular maintenance and have a long service life.

This model is perfect for use in an apartment building. This is due low level noise during its operation and compact dimensions. Tubular standard models have also proven themselves well for private use: they are small in size and do not buzz. However, the cost of such recuperators is slightly higher than the cost of plate products, so the choice of device depends on financial opportunities and personal preferences of the owners.

When choosing a model for a production workshop, non-food warehouse or underground parking lot, you should choose rotary devices. Such devices have great power and high performance, which is one of the main criteria for working over large areas. Recuperators with intermediate coolant have also proven themselves well, but due to their low efficiency they are not as in demand as drum units.

An important factor when choosing a device is its price. Yes, the most budget options plate heat exchangers can be purchased for 27,000 rubles, while a powerful rotary heat recovery unit with additional fans and a built-in filtration system will cost about 250,000 rubles.

Design and calculation examples

In order not to make a mistake when choosing a recuperator, you should calculate the efficiency and operating efficiency of the device. To calculate the efficiency, use the following formula: K = (Tp - Tn) / (Tv - Tn), where Tp denotes the temperature of the incoming flow, Tn - outside temperature, and TV – room temperature. Next, you need to compare your value with the maximum possible efficiency indicator of the purchased device. Typically this value is specified in technical passport model or other accompanying documentation. However, when comparing the desired efficiency and that indicated in the passport, you should remember that in fact this coefficient will be slightly lower than stated in the document.

Knowing the efficiency of a particular model, you can calculate its effectiveness. This can be done by the following formula: E (W) = 0.36xPxKx (Tv - Tn), where P will denote air flow and measured in m3/h. After all the calculations have been made, you should compare the costs of purchasing a recuperator with its efficiency, converted into monetary equivalent. If the purchase justifies itself, you can safely purchase the device. Otherwise, you should think about alternative methods heating the incoming air or installing a number of simpler devices.

At independent design device, it should be taken into account that maximum efficiency Counterflow devices have heat exchange capabilities. They are followed by cross-flow ducts, and in last place are unidirectional ducts. In addition, how intense the heat exchange will be directly depends on the quality of the material, the thickness of the dividing partitions, and also on how long the air masses will remain inside the device.

Installation details

Assembly and installation of the recovery unit can be carried out independently. The most simple view homemade device is a coaxial recuperator. To make it, take a two-meter plastic pipe for a sewer with a cross-section of 16 cm and an aluminum air corrugation 4 m long, the diameter of which should be 100 mm. At the ends big pipes put on adapter-splitters, with the help of which the device will be connected to the air duct, and put the corrugation inside, twisting it in a spiral. The recuperator is connected to the ventilation system in such a way that warm air is driven through the corrugation, and cold air goes through a plastic pipe.

As a result of this design, mixing of flows does not occur, and the street air has time to warm up while moving inside the pipe. To improve the performance of the device, you can combine it with a ground heat exchanger. During testing, such a recuperator gives good results. Yes, when outside temperature at -7 degrees and internal at 24 degrees, the productivity of the device was about 270 cubic meters per hour, and the temperature of the incoming air corresponded to 19 degrees. average cost homemade model– 5 thousand rubles.

At self-production When installing a recuperator, it should be remembered that the longer the heat exchanger is, the higher the efficiency of the installation. That's why experienced craftsmen It is recommended to assemble the recuperator from four sections of 2 m each, having carried out preliminary thermal insulation of all pipes. The problem of condensate drainage can be solved by installing a fitting for draining water, and placing the device itself at a slightly inclined angle.