Ventilation machine with recuperator. Air recuperators

Air handling unit- this is modern solution for organizing optimal air exchange and rational use of energy resources. The principle of operation is the implementation of forced inflow and removal of air outside the premises. On the basis of PES installations, you can create individual system microclimate by connecting various filters and devices.

Recovery ventilation system

To save thermal energy, some PES installations are equipped with recuperators. The heat exchanger is a metal heat exchanger that is integrated into the ventilation system and provides partial heating of the outside air due to the warm air removed. In this case, the heating of the bulk of the air flow is carried out by a conventional air heater. The supply and exhaust unit with heat recovery, although the price is higher than for other devices, but due to energy efficiency, these costs quickly pay off. An important characteristic of the device is its coefficient of performance (COP), which ranges from 30 - 96% depending on the type of heat exchanger, the speed of the air flow through the heat exchanger and the temperature difference.

supply exhaust ventilation with recuperation fully meets modern requirements for saving thermal energy. And thanks to the space heating function, it is considered the most promising development in the field of ventilation.

Main advantages:

1. Comfortable air exchange
2. Efficient Energy Saving
3. Humidity adjustment function
4. Reliable sound insulation
5. High efficiency up to 96%
6. Convenient control system
7. Air purification from dust and impurities
8. Maximum saving of thermal energy

Classification and characteristics of devices.

Depending on the design of the heat exchanger, the PVU with a recuperator can be of several types:

Plate heat exchangers are the most common design. Heat transfer occurs by passing air through a series of plates. During operation, condensate is formed, so the recovery system is additionally equipped with a condensate outlet. The efficiency is 50-75%.

The rotary heat exchanger is a cylindrical device densely packed with layers of corrugated steel. Heat exchange is carried out by a rotating rotor, which sequentially passes first warm and then cold air. In this case, the intensity depends on the speed of rotation of the rotor. The supply and exhaust system with this type of heat recovery is large, so it is suitable for shopping centers, hospitals, hotels and other large area premises. Due to the absence of freezing, the efficiency reaches 75-85%

Less common types include recuperators with an intermediate coolant (this can be water or a water-glycol solution). The efficiency is 40-60%. The air handling unit with a heat exchanger can be made in the form of heat pipes filled with freon. The efficiency of such a device is 50-70%. In addition, it is used chamber heat exchanger. Cold and warm air pass in it through one chamber, which is separated by a special damper. Periodically, the damper turns over, and the air flows change places. The efficiency is up to 90%.

Supply and exhaust ventilation with heat recovery best price!

A wide range of PVU installations is available for order in the online store "Yanvent" for various purposes, performance, configuration and cost.

Thanks to a convenient search form, you can easily find a suitable model and buy an air handling unit with heat recovery at the best price!

A comfortable indoor climate cannot be organized without a good ventilation system. Plastic windows, doors and Decoration Materials make the house so airtight that it can lead to a lack of natural ventilation, dampness and condensation. And if you take into account the general air pollution, then you simply cannot do without effective air filters. In such houses, an air recovery system for private houses must be present. This device is driven by a supply and exhaust unit, which contains a heat exchanger. Such a device will not only provide housing with fresh, purified air, but also help reduce heating costs.

Recuperator for a private house. Advantages

The term "recuperator" in translation from lat. means returning. The device itself is a heat exchanger that stores heat in the room and transfers it to the air entering from the street. Recuperation is a ventilation method with minimal heat consumption. Such a device helps to save up to 70% of heat and return it back to the room.

Main advantages:

• Low noise
• No need to open windows
• Possibility of installation in a false ceiling structure
• Savings on heating and air conditioning costs
• Convenience and additional features

Automatic adjustment of the intensity of air flow makes the use of devices not only safe, but also comfortable.

How to choose a ventilation recuperator?

All modern ventilation units use the same principle of operation - they provide air flow to the house, cleaning it from dust and impurities. Such systems may differ: in dimensions, cleaning class, performance, equipment and the presence of additional functions.

Units with an electric heat exchanger have a built-in rotary heat exchanger with an efficiency of 80% and a remote control. In devices with a water heater, it is possible to control the speed and temperature of the incoming air flow. Such ventilation units are more popular than those with electric heat exchangers.

Given the minimum energy consumption of a heat exchanger for a private house, the price of which is quite affordable, the cost of installing a ventilation system will pay off very quickly. And if we also take into account the undoubted benefits for health and general well-being, then the choice in favor of a PVU with a recuperator becomes obvious.

Our company manufactures supply and exhaust ventilation systems using highly efficient enthalpy heat exchangers, thanks to which we managed to achieve stable heat recovery with high efficiency in difficult climatic conditions.

It should be noted that TURKOV enthalpy heat exchangers are the only ones produced in the Russian Federation.

Enthalpy heat exchanger It is designed to transfer heat and moisture from the exhaust air to the supply air. In addition to moisture, part of the heat is transferred from the exhaust air, thereby increasing efficiency recuperator.

Moisture capacity of the heat exchanger depends on the outside temperature. The working area made of a polymer membrane allows water vapor molecules to pass from the humidified exhaust air and transfer it to the dry supply air.

There is no mixing in the recuperator supply and exhaust flows air.
Water molecules pass through the membrane due to diffusion due to the difference in the concentration of water vapor on both sides of the membrane, the cell sizes of which are so small that only water vapor can pass through it - for other substances that pollute the air flow, the membrane turns out to be a reliable barrier.

Possessing the property of a sponge, the heat exchanger plate allows it to absorb moisture without condensate falling on the surface of the plates.

Cases of supply and exhaust ventilation equipment manufactured by the company are constantly being improved, improving the properties of thermal insulation and noise absorption.
Thanks to the use of polypropylene, it was possible to achieve a radical reduction in the level of low-frequency noise.

Our company offers the widest range of heat recovery ventilation equipment that can meet the needs of premises of various purposes and sizes.

The main differences between TURKOV supply and exhaust ventilation systems

In addition to enthalpy heat exchangers, supply and exhaust ventilation can be equipped with other types of heat recovery devices, with overview which we invite you to read:

About recovery in the supply and exhaust ventilation system

This process determines the return of some heat to reheat the air entering the room. Return is carried out through the heat exchanger of the heat exchanger, when part of the heat is transferred from the exhaust air to the incoming fresh flow. And during the hot summer period, the heat exchanger reduces the penetration into the room along with the supply air high temperature environment.

In heat exchangers extract and supply air flowing at different temperatures. Cold air in contact with the warm surface of the wall is heated. The air stream with an increased temperature, in contact with a cold surface, is cooled.

Main characteristics of recuperators

Supply and exhaust ventilation with recuperation is used in industrial and public facilities, as well as in residential buildings. The indicators by which ventilation units with recuperation are distinguished are as follows:

• according to available power.
• according to the design of the coolant.
• existing types can be tubular, lamellar and ribbed.
• according to the material used for heat transfer. This function is performed by air or liquid.
• in the direction of movement of the energy carrier, the direction of which can be direct, transverse or countercurrent.
• from the place of installation on the object. If the heat exchanger serves the premises of the entire building, it is called central. Decentralized devices are those that are installed for maintenance private rooms or offices.

The main components of the design of the recuperator are as follows:

• housing for fixing the component parts of the unit, ensuring their safety and performance.
• a heat exchanger that exchanges heat between various energy carriers.
• fan unit - to move flows air masses by extract and inflow.
• heating elements that maintain the required temperature.
• multi-stage filters with different degrees of air purification, retaining pollution, impurities, odors.
• automation unit with programmable controls for recuperation processes.
• controller with a panel for displaying the real mode of operation by timer with the function of diagnosing nodes, sensors.
• air dampers of various shapes with a manual or electric drive, regulating the throughput of the air duct.
• valves with rubber seals, having the same function as air dampers.
• silencers to absorb outgoing sound from the operating device.

The main types of recuperators

Characteristics of the rotary type.

They occupy a wide range of applications in industry and in public utilities. Having a large surface of the heat exchanger, devices of this type are quite effective. Possibility of regulation of speed of turns of a rotor, allows to choose the required optimum mode. Its efficiency is less than that of a plate heat exchanger. This is explained by the increased consumption of electricity for its optimal operation. The disadvantages include: a large size of the heat exchanger, control over the rotating rotor and partial ingress of air from the exhaust jet into the incoming inflow. For this reason, the use of rotary heat exchangers in humid and toxic environments is limited.

The design of the rotary heat exchanger and its operation.

The main unit is a set of heat exchange discs with blades forming a cylindrical rotor. Rotating, it pushes air flows. And at the same time as the heat exchanger heats it or cools it. The discs, the number of which can vary, consist of cells made of corrugated sheet material. During installation, the drum shaft is oriented horizontally, maintaining parallelism to the direction of air flow. Rotating, it alternately drives out the first heated air, then draws in the supply air, transferring part of the heat to it. The structure of the device is technically complex, increasing its cost. Its installation requires qualified installation and skillful maintenance.

Characteristics of the plate recuperative device.

Working on a supply and exhaust system, it is designed for ventilation and saving thermal energy. The main characteristic is its efficiency (COP). The thermal coefficient is calculated according to this formula. The temperature difference in the room after the inflow and outside air is divided by the temperature difference between the removed and outside air.

The device is in high demand by customers. The disadvantage is the appearance of frost marks on the plates on the exit side. This is due to the fact that the heat exchanger plate has a different temperature with the air being removed. Therefore, condensation forms. Lowering the outside temperature accelerates the build-up of icing layers. Frozen plates create resistance to the passing air stream. Because of this, the ventilation performance decreases, the recovery slows down until the device stops completely. Work resumes after thawing of the plates. The degree of freezing is regulated by a special valve. When an ice layer occurs, the valve opens and the incoming air enters for some time without heating. exhaust warm air is aimed at defrosting the ice layer, and the resulting wet streaks merge into drainage tank and into the sewer. In this mode, the energy consumption for the operation of the heat exchanger is reduced to a minimum.
About the device of the recuperator and its operation. It consists of a housing made of aluminum, galvanized sheet with anti-corrosion coating. The walls inside the case are covered with a layer of insulating material. Supply and exhaust air pass through built-in filters.

Compared with a rotary device, the air flows in a plate heat exchanger are clearly demarcated. The exhaust and supply channels are separated by plates. Aerodynamic characteristics and efficiency are affected by the chosen distance between the heat exchanger plates.

Heat exchange units are made of copper, aluminum or steel sheets. The aluminum heat exchanger is characterized by increased heat transfer and corrosion resistance. For the manufacture of plastic or very rarely cellulose materials are also used. Plastic heat exchangers are light in weight, low in performance and are used for living conditions. Paper heat exchangers are rarely used, but they transform moisture and heat well. Moisture is not removed into the atmosphere, but enters the room along with the incoming air. The number of a set of plates separating the flows can be different. The optimal distance is maintained from 5 to 9 mm. By adjusting the selection of the number of cassettes, the appearance of condensate is reduced. The thermal defrost element reduces efficiency by taking part of the electricity for its operation. The design is easy to mount, reliable in operation and low cost.

Roof mounted heat exchangers

These ventilation units are used in facilities with a large working space. They filter, heat and supply air to the building. The air temperature is controlled by a duct heater or cooler. Its inflow is carried out partially or in full through the lamellar structure of the heat exchanger.

Characteristic.

Install such supply and exhaust ventilation systems on the roofs of buildings through holes made in them. Recuperators extract the used air collected under the ceiling and release it into the atmosphere, and its heat is transferred to a powerful incoming jet. The air supply is directed directly to the ceiling or directed to working area. The recuperator can be a component in general scheme ventilation of the entire facility. The device is easy to operate.

Design.

Unit models are made different power, which is measured by the volume of passing air in cubic meters per hour. The basis of the device is a frame-panel structure made of aluminum profiles. Optimal Thickness heat exchanger sheets about 0.2 mm. For sound and thermal insulation, the walls of the case are laid mineral wool. Recuperators are completed for heating with electric, water and gas sections. The achieved efficiency is about 65%. Mounting supply and exhaust ventilation does not cause any difficulties. To do this, it is necessary to make a window in the roof and strengthen the structure - the “glass” for proper load distribution. Installing a heat exchanger on the roof does not occupy the usable volume of the building.

Heat exchanger with water circulation

Characteristic.

The thermal energy carrier is water or antifreeze entering the supply unit from a separately placed exhaust heat exchanger. The operation of a heat exchanger with water circulation is similar to that of water heating. Usefulness of an action plate heat exchanger with water circulation reaches 50-65%.
Supply and exhaust ventilation with recuperators of this type is rarely used when it is possible to assemble a heat exchange line. The operation of this system requires frequent monitoring. The weak point is the presence of a pump that circulates the heat exchanger. As well as additional nodes that regulate the operation of the system. They increase energy consumption. At a large distance supply and exhaust heat exchangers, it is not advisable to use this option. The heat exchanger performs only the function of heat exchange without moisture transformation.

Design.

Main nodes supply and exhaust ventilation system with heat recovery are two heat exchangers. They are installed separately in the supply and exhaust ducts. Connect them with an insulated flexible pipeline. He allows more easy choice location of nodes and installation of the system. The heat exchanger with water circulation is equipped with a pump, expansion tank, controller, pressure indicator. temperature sensors. Air, safety and control valves. When installing a single recovery system, several heat carriers can be connected. Different ways of exhaust and air supply ensure the operation of the heat exchanger without the formation of traces of icing. The transfer of contaminants from the outgoing air to the inlet stream is excluded.

Selection of supply and exhaust ventilation unit

There are special ventilation unit selection programs. Using a computer, and in accordance with the requirements, they select equipment taking into account performance, air consumption, and a suitable configuration. The program will simulate the installation with the required dimensions and characteristics. In reality, it is possible to analyze the optimal connection of nodes and constituent elements. The program does not require special training. The selection of the supply and exhaust ventilation unit is facilitated by the demonstration of the selection result on the monitor. Indicate only its composition, laying the necessary information from the proposed options. The choice is made automatically, according to the data entered by the customer. Further, as in the game constructor, the required nodes are removed or supplemented. For example, add a water heating section, specifying its parameters. Or include other adjustment elements and automation kits.

Briefly about the installation of the heat exchanger

Before installing the supply and exhaust ventilation system, a primary installation project is carried out. Roughly estimate the scope of the cost future work. Having studied all the features of the object, the conditions of the customer and the capabilities of the contractor, they set the exact price. Then they draw up a detailed project with an agreed final price.

Mount recuperators on walls, ceilings, roofs on the floor. They are located in any position and on the outside of the building. The mounting opening in the wall is made with a diameter of up to 250 mm with a diamond tool. The working module of the device is located in the wall. Ventilation grilles are placed at the end. The hole in the wall is placed at an inclination of about 3 degrees to the foundation of the building. The outer pipe must protrude at least 5 cm beyond the wall surface.

Installation of the roof heat exchanger is carried out according to a special project on the bearing part of the ceiling. It is installed in a round or square structure made of galvanized steel. Or in a reinforced concrete glass, laid during the construction of the building. Its size in diameter is 700-1450 mm. Before installing the heat exchanger, a casing is preliminarily fixed to protect against foreign objects entering the channels.

Two air ducts are laid to move air. The first one is the main one. It is larger in diameter. Serves for the intake and separation of air flows to each consumer. The second one is of smaller diameter to remove the used atmosphere. The piping is fully insulated for quiet operation and to prevent condensation. By strengthening the pipes behind the suspended ceiling, they "eat up" the size of the room in height by 20 cm. The large length of the air ducts creates increased resistance to air flow. In this case, the device is equipped with additional fans that support the required pressure.

List of questions on the choice of supply and exhaust ventilation with recuperation

The customer needs.

1. Get information about the equipment manufacturer from the manager or seller. The duration of the existence of the company, its position in the market and customer reviews.
2. Specify the performance of the heat exchanger at the place of its installation. In accordance with the size, layout of the room or house. Information can be obtained from the company's specialists.
3. Determine the resistance to air flow after installation of the unit, taking into account the dimensions and bends of the duct. The calculation is carried out by the designer.
4. The choice of the type and power of the heat exchanger, taking into account the air flow and the resistance of pipelines. Performed by the designer.
5. Determination of the class (energy consumption) of the heat exchanger. The customer receives an answer to the questions: the cost of operating the system, the amount of energy saved, the calculation of the cost of the heating season.
6. Check the availability of the certificate and the validity of the warranty. It is issued for the components of the heat exchanger and the entire supply and exhaust ventilation system. How best quality component parts - the more expensive the device will cost.
7. Compare the passport efficiency with the real coefficient. It depends on:
   - the difference between the temperature of the air in the room and the external environment;
   - type of heat exchanger cassette;
   - air humidity;
   - the correct layout of the system and its placement on the site.

Efficiency for different types of recuperators.

• For a paper plate heat exchanger, it will be 60-70%. When the installation freezes, it is defrosted by the system itself, while reducing productivity. The highest rate is achieved in the absence of the defrosting function and additional heating of the incoming air.
• For an aluminum plate heat exchanger, the efficiency will be up to 63%. Sometimes productivity decreases up to 45%. This is due to the frequent defrosting process of the heat exchanger. The formation of ice on the surface is eliminated by increasing the consumption of electricity.
• In a rotary heat exchanger, the efficiency is regulated by “automatic”. It responds to the readings of temperature sensors placed outside and in the room. However, with the appearance of ice layering, the efficiency decreases.

Approximate characteristics of some household recuperators.

From all of the above, we can confidently say:

It's obvious that supply and exhaust ventilation with a recovery company from TURKOV is at the forefront of modern engineering technologies.

Once again, we recall the main distinctive features supply and exhaust ventilation units TURKOV and invite to our catalog to get acquainted with detailed descriptions equipment:

Many of the buildings currently under construction, both industrial and residential, have very complex infrastructures and are designed with the utmost emphasis on energy efficiency. Therefore, it is impossible to do without installations of such systems as general air ventilation systems, smoke protection systems and air conditioning systems. To ensure the efficient and long service life of ventilation systems, it is necessary to design and install a high-quality general air ventilation system, a smoke protection system and an air conditioning system. Installation of such equipment of any type must be carried out with the obligatory observance of certain rules. And according to the technical characteristics, it must correspond to the volume and type of premises in which it will be operated (residential building, public, industrial).

Of great importance is the correct operation of systems: compliance with the terms and rules for preventive inspections, scheduled preventive repairs, as well as the correct and high-quality adjustment of ventilation equipment.

For each ventilation system in Moscow, accepted for operation, a passport and an operating log are drawn up. The passport is drawn up in two copies, one of which is stored at the enterprise, and the other in the technical supervision service. Everything is entered in the passport specifications systems, information about the repair work, copies of as-built drawings of ventilation equipment are attached to it. In addition, the passport reflects a list of operating conditions for all components and parts of ventilation systems.

According to the established schedule, scheduled inspections of ventilation systems are carried out. During scheduled inspections:

• Defects are identified and corrected current repair;
• The technical condition is determined;
• Partial cleaning and lubrication of individual components and parts are carried out.

All data of scheduled inspection of ventilation systems, in without fail indicated in the operating log.

Also, during the working shift, the on-duty operational team provides for scheduled overhaul maintenance of ventilation systems. This service includes:

• Start-up, regulation and shutdown of ventilation equipment;
• Supervision of the operation of ventilation systems;
• Control of conformity of parameters of the air environment and temperature supply air;
• Elimination of minor defects.

Commissioning of general air ventilation systems, smoke protection systems and air conditioning systems

Stage commissioning is a very important stage, because the high-quality work of ventilation and air conditioning depends on commissioning.

During commissioning, you can see the work of the installation team, and the parameters specified in the project, there is a check and comparison of the equipment indicators with the indicators specified in project documentation. During the survey, full check the technical condition of the installed equipment, the distribution and uninterrupted operation of adjustment devices, the installation of control and diagnostic devices, the detection of errors in the operation of the equipment. If deviations are detected that are within the normal range, then the readjustment does not occur, and the object is prepared for delivery to the customer, with the execution of all documents.

All masters of our company have a specialized education, certificates in health and safety, rich work experience and have all Required documents and evidence.

At the stage of commissioning, we measure the air flow velocity in the air ducts, the noise level, test the quality of equipment installation, adjust engineering systems in accordance with the parameters of the project, certification.

Start-up tests and adjustment of ventilation and air conditioning systems must be carried out by a construction and installation or a specialized commissioning organization.

Certification of systems

A technical document drawn up on the basis of a check of the working condition of ventilation systems and equipment, carried out using aerodynamic tests, is called certification of the ventilation system.

SP 73.13330.2012 "Internal sanitary systems of buildings", updated version of SNIP 3.05.01-85 "Internal sanitary systems" regulate the form and content of the ventilation system passport.

Obtaining a ventilation system passport, in accordance with the requirements of the above document, is mandatory.

At the end of the installation work, the customer receives a passport for the ventilation system.

A passport must be obtained for each ventilation system.

The passport is indispensable for the registration of purchased equipment, for the correct operation of such equipment, in order to achieve the necessary sanitary and hygienic air parameters.

In the period established by law, this document is provided by the control and supervisory authority. The receipt of this document is an indisputable proof in resolving disputes with the relevant authorities.

Obtaining a ventilation system passport can be carried out as separate view works, consisting of a complex of aerodynamic tests. The conduct of such events is regulated by the following regulations:

• SP 73.13330.2012;
• STO NOSTROY 2.24.2-2011;
• R NOSTROY 2.15.3-2011;
• GOST 12.3.018-79. “Ventilation systems. Methods of aerodynamic tests”;
• GOST R 53300-2009;
• SP 4425-87. "Sanitary and hygienic control industrial premises»;
• SanPiN 2.1.3.2630-10.

Air recirculation in ventilation systems is a mixture of a certain amount of exhaust (exhaust) air to the supply air. Thanks to this, a reduction in energy costs for heating fresh air in the winter period of the year is achieved.

Scheme of supply and exhaust ventilation with recovery and recirculation,
where L - air flow, T - temperature.

Heat recovery in ventilation- this is a method of transferring thermal energy from the exhaust air stream to the supply air stream. Recuperation is used when there is a temperature difference between the exhaust and supply air, to increase the temperature of the fresh air. This process does not imply mixing of air flows, the process of heat transfer occurs through any material.

Temperature and air movement in the heat exchanger

Heat recovery devices are called heat recuperators. They are of two types:

Heat exchangers-recuperators- they transfer heat flow through the wall. They are most often found in installations of supply and exhaust ventilation systems.

In the first cycle, which are heated by the outgoing air, in the second they are cooled, giving off heat to the supply air.

The supply and exhaust ventilation system with heat recovery is the most common way to use heat recovery. The main element of this system is the supply and exhaust unit, which includes a heat exchanger. The device of the supply unit with a heat exchanger allows transferring up to 80-90% of heat to the heated air, which significantly reduces the power of the air heater, in which the supply air is heated, in case of a lack of heat flow from the heat exchanger.

Features of the use of recirculation and recovery

The main difference between recuperation and recirculation is the absence of air mixing from the room to the outside. Heat recovery is applicable for most cases, while recirculation has a number of limitations, which are specified in regulatory documents.

SNiP 41-01-2003 does not allow re-supply of air (recirculation) in the following situations:

• In rooms where the air flow is determined on the basis of emitted harmful substances;
• In rooms in which there are pathogenic bacteria and fungi in high concentrations;
• In rooms with the presence of harmful substances, sublimated upon contact with heated surfaces;
• In rooms of category B and A;
• In rooms where work is carried out with harmful or combustible gases, vapors;
• In rooms of category B1-B2, in which combustible dusts and aerosols can be released;
• From systems with the presence in them of local suction of harmful substances and explosive mixtures with air;
• From vestibules-sluices.

Recycling:
Recirculation in air handling units is actively used more often with high system productivity, when air exchange can be from 1000-1500 m 3 / h to 10000-15000 m 3 / h. The removed air carries a large supply of thermal energy, mixing it into the outside air flow allows you to increase the temperature of the supply air, thereby reducing the required power heating element. But in such cases, before being re-introduced into the room, the air must pass through the filtration system.

Recirculation ventilation improves energy efficiency, solves the problem of energy saving in the case when 70-80% of the exhaust air enters the ventilation system again.

Recovery:
Air handling units with recuperation can be installed at almost any air flow rate (from 200 m 3 /h to several thousand m 3 /h), both at low and at large. Recuperation also allows heat to be transferred from the extract air to the supply air, thereby reducing the energy demand on the heating element.

Relatively small installations are used in ventilation systems of apartments and cottages. In practice, air handling units are mounted under the ceiling (for example, between the ceiling and the suspended ceiling). This solution requires the installation of some specific requirements, namely: dimensions, low noise, easy maintenance.

The air handling unit with recuperation requires maintenance, which obliges to make a hatch in the ceiling for servicing the heat exchanger, filters, blowers (fans).

The main elements of air handling units

A supply and exhaust unit with recovery or recirculation, which has both the first and second processes in its arsenal, is always a complex organism that requires highly organized management. The air handling unit hides behind its protective box such main components as:

• Two fans various types, which determine the performance of the installation by flow.
• Heat exchanger recuperator- heats the supply air by transferring heat from the exhaust air.
• Electric heater- heats the supply air to the required parameters, in case of a lack of heat flow from the exhaust air.
• Air filter- thanks to it, the control and purification of the outside air is carried out, as well as the processing of the exhaust air in front of the heat exchanger, to protect the heat exchanger.
• Air valves with electric actuators - can be installed in front of the outlet air ducts for additional air flow control and channel blocking when the equipment is turned off.
• bypass- thanks to which the air flow can be directed past the heat exchanger during the warm season, thereby not heating the supply air, but supplying it directly to the room.
• Recirculation chamber- providing the admixture of the removed air into the supply air, thereby ensuring the recirculation of the air flow.
  
  

In addition to the main components of the air handling unit, it also includes a large number of small components such as sensors, automation system for control and protection, etc.

Control scheme

All components of the air handling unit must be properly integrated into the system of operation of the unit, and perform their functions in the proper amount. The task of controlling the operation of all components is solved by automated system process control. The installation kit includes sensors, analyzing their data, the control system corrects the operation of the necessary elements. The control system allows you to smoothly and competently fulfill the goals and tasks of the air handling unit, solving difficult problems interaction of all elements of the installation with each other.

Ventilation control panel

Despite the complexity of the process control system, the development of technologies makes it possible to provide an ordinary person with a control panel from the plant in such a way that from the first touch it is clear and pleasant to use the plant throughout its service life.

Example. Heat recovery efficiency calculation:
Calculation of the efficiency of using a recuperative heat exchanger in comparison with using only an electric or only a water heater.

Consider a ventilation system with a flow rate of 500 m 3 /h. Calculations will be carried out for the heating season in Moscow. From SNiPa 23-01-99 "Construction climatology and geophysics" it is known that the duration of the period with an average daily air temperature below + 8 ° C is 214 days, the average temperature of the period with an average daily temperature below + 8 ° C is -3.1 ° C .

Calculate the required average heat output:
In order to heat the air from the street to a comfortable temperature of 20 ° C, you will need:

N = G * C p * p ( in-ha) * (t ext -t avg) = 500/3600 * 1.005 * 1.247 * = 4.021 kW

This amount of heat per unit of time can be transferred to the supply air in several ways:

1. Supply air heating by an electric heater;
2. Heating of the supply heat carrier removed through the heat exchanger, with additional heating by an electric heater;
3. Heating of outdoor air in a water heat exchanger, etc.

Calculation 1: Heat is transferred to the supply air by means of an electric heater. The cost of electricity in Moscow S=5.2 rubles/(kW*h). Ventilation works around the clock, during 214 days of the heating period, the amount Money, in this case will be equal to:
C 1 \u003d S * 24 * N * n \u003d 5.2 * 24 * 4.021 * 214 \u003d 107,389.6 rubles / (heating period)

Calculation 2: Modern recuperators transfer heat with high efficiency. Let the recuperator heat the air by 60% of the required heat per unit time. Then the electric heater needs to spend the following amount of power:
N (electric load) \u003d Q - Q rec \u003d 4.021 - 0.6 * 4.021 \u003d 1.61 kW

Provided that the ventilation will work for the entire period of the heating period, we get the amount for electricity:
C 2 \u003d S * 24 * N (electric load) * n \u003d 5.2 * 24 * 1.61 * 214 \u003d 42,998.6 rubles / (heating period)

Calculation 3: A water heater is used to heat outdoor air. Estimated cost of heat from technical hot water per 1 gcal in Moscow:
S year \u003d 1500 rubles / gcal. Kcal=4.184 kJ

For heating, we need the following amount of heat:
Q (g.w.) \u003d N * 214 * 24 * 3600 / (4.184 * 106) \u003d 4.021 * 214 * 24 * 3600 / (4.184 * 106) \u003d 17.75 Gcal

In the operation of ventilation and heat exchanger throughout the cold period of the year, the amount of money for heat technical water:
C 3 \u003d S (hot water) * Q (hot water) \u003d 1500 * 17.75 \u003d 26,625 rubles / (heating period)

The results of calculating the costs of supply air heating for heating
period of the year:

From the above calculations, it can be seen that the most economical option is to use the hot service water circuit. In addition, the amount of money required to heat the supply air is significantly reduced when using a recuperative heat exchanger in the supply and exhaust ventilation system compared to using an electric heater.

In conclusion, I would like to note that the use of recuperation or recirculation units in ventilation systems makes it possible to use the energy of the exhaust air, which makes it possible to reduce the energy costs for heating the supply air, and therefore the monetary costs for the operation of the ventilation system are reduced. The use of the heat of the removed air is a modern energy-saving technology and allows you to get closer to the "smart home" model, in which any available type of energy is used to the fullest and most useful.