Fancoils in air heating systems of private houses. Heating with fan coil units What are fan coil units

We love being at home comfortable temperature even if it's hot or cold outside. Air conditioners save us in the summer. But can one air conditioner cope with a large private house? But what if you need to cool an office or an entire shopping center?

Many people think that air conditioners are limited. Of course, this type is the most common, but there are other types that are no less effective. One of them is a chiller-fan coil air conditioning system. The word is complicated, but it is not difficult to guess from it what this system consists of. Let's try to disassemble each of the parts of the system - fan coil and chiller - and understand what are its advantages.

What is a fancoil?

A fancoil is a device that cools or heats the air in a room. Fancoil is an element of the whole air conditioning system. It is also called a fan coil. The fancoil consists of two parts: a fan (fan) and a heat exchanger (coil). Often there is a coarse filter in the closer so that large, fluff and other pollutants do not get into the device. AT modern models a remote control is provided.

In the well-known split systems, the indoor unit is the same fan coil unit. Only split systems cool or heat the air thanks to the refrigerant - a special gaseous substance, most often freon. In the fan coil, a liquid works - water or a non-freezing aqueous solution of ethylene glycol.

Principle of operation fan coil is simple:

1. The fan "takes" air from the room and sends it to the heat exchanger.
2. Meanwhile, cold or hot water enters the heat exchanger, depending on which air temperature you want to achieve.
3. The water in the heat exchanger takes or gives off heat to the air.
4. Then the air, cooled or heated, returns to the room - already at the desired temperature.
5. When the system is set to cool the air, condensate occurs on the heat exchanger, which, using a pump, drains into the sewer or is discharged to the street.

But where does the water get into the heat exchanger? To get it, the fan coil needs an additional unit. A boiler plant or heat pump is used to heat the air, and a chiller is used to cool the air. We will talk about the chiller a little later.

There can be several fan coil units in one room - just like heating radiators. The number of units depends on the area of ​​the room and on the requirements for air temperature.

The fancoil can operate not only in air recirculation mode, but also in mixed mode, that is, it combines the air from the room with fresh air. But not all door closers have this option, but only those connected to the supply ventilation.

According to the installation method fan coils are divided into:

• floor;
• wall;
• ceiling.

There are universal devices that are mounted on the wall and on the ceiling.

There are also hull and unframed fancoils. Models without a case are cheaper; they are usually camouflaged behind decorative panels or suspended ceilings.

By number of heat exchangers fan coils are:

• Two-pipe when two pipes leave one heat exchanger. Through one pipe, water enters the fan coil, through the other it goes back. Basically, two-pipe models are used only for cooling. Air heating is also possible, but you will have to heat the water in an additional heat exchanger and use a special pump.
• Four-pipe. There are two heat exchangers in such fan coil units, two pipes depart from each. Cold water circulates in one heat exchanger, and hot water circulates in the other. Thanks to this, the device cools and heats the air without problems.

There is another classification of fan coil units:

• Cassette fan coil units installed where there are suspended ceilings. They are two- and four-pipe. Usually cassette models are made without a case, since most of it is hidden anyway. Only visible remains decorative panel- it has shutters that distribute the air flow. Fancoil cassette type almost no noise, relatively easy to install, and evenly distributes air throughout the room.
• Duct fan coil units often used for large facilities, such as offices and shopping centers. They are installed inside ventilation system behind false ceilings and behind false walls. Channel-type fan coil units can either supply Fresh air or clear an existing one.

A chiller is a machine for cooling liquid. Often it works in tandem with a fan coil unit, but it also has another application: for example, a skating rink is poured with a chiller, medicines are cooled. As a rule, the chiller in the chiller-fan coil system is located on the roof or in technical room.

By type of cooling chillers are divided into two types:

• air cooled when the condenser in the chiller - the device in which the refrigerant turns from a gas into a liquid - is blown by a stream of air.
• water cooled when the condenser in the chiller is cooled by running water

There are also absorption and vapor compression chillers:

• Absorption. In such chillers, a mixture of water and lithium bromide is used instead of freon. In Russia, they are not yet very common.
• Vapor compression. Now this type is the most common. In fact, this is the same freon air conditioner, only not air passes through it, but water. Vapor compression chillers consist of a compressor, condenser, expansion valve and evaporator.

Principle of operation chiller is as follows:

1. The compressor increases the pressure of freon - a gaseous refrigerant.
2. Then freon enters the condenser, where it cools and becomes liquid.
3. Freon boils in the thermostatic expansion valve (TRV) and begins to evaporate.
4. Freon absorbs heat from the water in the evaporator.
5. Freon becomes gaseous again, and the cycle repeats.
6. The water cooled in the evaporator enters the fan coil, which distributes air throughout the room.

Chiller Installation: From Design to Testing

The most difficult part of installing a chiller-fan coil system is the installation of the chiller. It goes through several stages:

1. Preparatory work. At this stage, the features of the premises or building are clarified, the necessary equipment is selected.
2. Choice of location. The place is selected taking into account the weight and dimensions of the chiller. It is also important to provide free approaches to the unit so that it is easy to maintain.
3. Base installation. Just putting the chiller on the floor or roof will not work - you need a base or mounting frame, on which the device will then be installed.
4. Vibration isolation. To prevent vibrations from the operation of the chiller from being felt like a small earthquake, anti-vibration mounts are installed.
5. Chiller installation. If the unit is too large, it is installed using special equipment.
6. Hydraulic circuit installation, i.e. connecting pipelines to the cooler and installing fan coil units.
7. Setting electrical systems and testing chiller operation.

Climatic equipment must be selected, installed and maintained by qualified specialists.

Chiller-fan coil system: pros and cons

Now that we know what a fan coil and chiller are, we can understand what a chiller-fan coil system is. The chiller, the external unit of the system, is connected by a pipeline to a fan coil - an internal heat exchanger, which is blown by a fan.

But why do we need such a system if there are conventional air conditioners? The fact is that it has several advantages over split systems:

• Scalability. Due to the gas refrigerant, the distance between the indoor and outdoor units in split systems is limited. In a chiller-fan coil system, you can connect as many fan coil units as you like at a distance of up to several hundred meters - specific characteristics depend on the chiller power and pumping station. Due to this, even in a large building, only one chiller can be used.
• aesthetic component. Due to limited distance between indoor and outdoor units outdoor unit conventional air conditioner is placed on the facade of the building. In the chiller-fan coil system, the chiller is placed on the roof or in the technical room, so appearance facade is preserved.
• Versatility. If many split systems, this air conditioning option works around the clock at any temperature. In addition, thanks to the large number of fan coil units, it is possible to easily control the air temperature in each individual room.
• Safety. The refrigerant is liquid, not gas, as in split systems, so the likelihood of an accident is much lower.

Multizone climate system chiller-fan coil is designed to create comfortable conditions inside a large building. It works constantly - in summer it supplies cold, and in winter heat, warming the air to a predetermined temperature. It’s worth getting to know her device, do you agree?

In our proposed article, the design and components of the climate system are described in detail. Methods for connecting equipment are given and analyzed in detail. We will tell you how this thermoregulation system is arranged and functions.

The role of the cooling device is assigned to the chiller - an external unit that produces and supplies cold through pipelines with water or ethylene glycol circulating through them. This is what distinguishes it from other split systems, where freon is pumped as a coolant.

For the movement and transfer of freon, refrigerant, expensive copper pipes. Here they do a great job. water pipes with thermal insulation. Its operation is not affected by the outside temperature, while split systems with freon lose their efficiency already at -10⁰. The internal heat exchange unit is a fan coil unit.

It receives low temperature liquid, then transfers the cold to the room air‚ and the heated liquid returns back to the chiller. Fancoils are installed in all rooms. Each of them works according to an individual program.

The main elements of the system are a pumping station‚ a chiller‚ a fancoil. The fancoil can be installed at a great distance from the chiller. It all depends on how powerful the pump is. The number of fan coil units is proportional to the chiller capacity

Typically, such systems are used in hypermarkets‚ shopping malls‚ buildings‚ built underground‚ hotels. Sometimes they are used as heating. Then, through the second circuit, heated water is supplied to the fan coil units or the system is switched to a heating boiler.

Structural version of the system

According to the design of the chiller-fan coil system, there are 2-pipe and 4-pipe. According to the type of installation, wall-mounted, floor-standing, built-in devices are distinguished.

The system is evaluated according to the following main parameters:

• chiller power or cooling capacity;
• fan coil performance;
• air mass movement efficiency;
• highway lengths.

The last parameter depends on the strength pumping unit and the quality of pipe insulation.

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Chiller and fan coil connection

The coordinated functioning of the system occurs by connecting to one or more fan coil units through pipelines with thermal insulation. In the absence of the latter, the efficiency of the system drops significantly.

Each fincoil has an individual piping unit, through which its performance is regulated both in the case of heat and cold generation. The refrigerant flow in a separate unit is regulated by means of special fittings - shut-off and control.

To direct the chilled water to the heat exchanger, one pipe is connected to the fan coil, and the other - to drain the liquid - to the chiller. The design of the system allows the mixing of the refrigerant with the coolant

If it is not allowed to mix the coolant with the refrigerant. water is heated in a separate heat exchanger and complement the circuit circulation pump. To ensure smooth adjustment of the flow of the working fluid through the heat exchanger, a 3-way valve is used when installing the piping circuit.

If a two-pipe system is installed in the building, then both cooling and heating occur due to the cooler - chiller. To increase the efficiency of heating with help during the cold period, in addition to the chiller, a boiler is included in the system.

Unlike two-pipe system with one heat exchanger, 2 of these nodes are incorporated into the four-pipe system. In this case, the fan coil unit can work both for heating and cold, using in the first case the liquid circulating in the heating system.

One of the heat exchangers is connected to the refrigerant pipeline, and the second to the heat carrier pipe. Each heat exchanger has an individual valve controlled by a special remote control. If such a scheme is applied, the refrigerant never mixes with the heat carrier.

Since the temperature of the coolant in the system during the heating season ranges from 70 to 95⁰ and for most fan coil units it exceeds the allowable one, it is first reduced. Therefore, the supply from the central heating network to the fan coil units passes through a special heating point.

Main chiller classes

The conditional division of chillers into classes occurs depending on the type of refrigeration cycle. On this basis, all chillers can be conditionally classified into two classes - absorption and vapor compressor.

Absorption unit device

An absorption chiller or ABCM uses a binary solution with water and lithium bromide present in it - an absorber. The principle of operation is the absorption of heat by the refrigerant in the phase of converting vapor into a liquid state.

Such units use the heat released during operation industrial equipment. In this case, the absorbent absorber with a boiling point significantly higher than the corresponding parameter of the refrigerant dissolves the latter well.

The operation scheme of a chiller of this class is as follows:

1. Heat from an external source is fed to a generator where it heats up a mixture of lithium bromide and water. When the working mixture boils, the refrigerant (water) evaporates completely.
2. The vapor is transferred to the condenser and becomes a liquid.
3. The liquid refrigerant enters the throttle. Here it cools down and the pressure drops.
4. The liquid enters the evaporator, where the water evaporates and its vapors are absorbed by the lithium bromide solution - the absorber. The air in the room is cooled.
5. The diluted absorbent is reheated in the generator and the cycle is restarted.

Such an air conditioning system has not yet become widespread, but it is fully in tune with current trends concerning energy saving, therefore, has good prospects.

The design of vapor compression plants

Most refrigeration systems operate on the basis of compression cooling. Cooling occurs due to the continuous circulation, boiling at low temperatures, pressure and condensation of the coolant in a closed-type system.

The design of a chiller of this class includes:

• compressor;
• evaporator;
• capacitor;
• pipelines;
• flow regulator.

The refrigerant circulates in a closed system. This process is controlled by a compressor, in which a gaseous substance with a low temperature (-5⁰) and a pressure of 7 atm is compressed when the temperature is raised to 80⁰.

Dry saturated steam in a compressed state goes to the condenser, where it is cooled to 45⁰ at a constant pressure and turns into a liquid.

The next point on the path of movement is the throttle (reducing valve). At this stage, the pressure is reduced from the value of the corresponding condensation to the limit at which evaporation occurs. At the same time, the temperature also drops to approximately 0⁰. The liquid partially evaporates and wet steam is formed.

The diagram shows a closed cycle, according to which the vapor compression plant operates. The compressor (1) compresses wet saturated steam until it reaches pressure p1. In the compressor (2), the steam gives off heat and transforms into a liquid. In the throttle (3), both the pressure (p3 - p4)‚ and the temperature (T1-T2) decrease. In the heat exchanger (4), pressure (p2) and temperature (T2) remain unchanged

Having entered the heat exchanger - evaporator, the working substance, a mixture of vapor and liquid, gives off cold to the coolant and takes heat from the refrigerant, drying at the same time. The process takes place at constant pressure and temperature. The pumps supply low temperature fluid to the fan coil units. Having traveled this path, the refrigerant returns to the compressor to repeat the entire vapor compression cycle again.

Vapor Compression Chiller Specifics

In cold weather, the chiller can operate in natural cooling mode - this is called free-cooling. At the same time, the coolant cools the outside air. Theoretically, free cooling can be used at an external temperature of less than 7⁰С. On practice optimum temperature for this 0⁰.

When set to "heat pump" mode, the chiller works for heating. The cycle undergoes changes, in particular, the condenser and evaporator exchange their functions. In this case, the coolant must be subjected not to cooling, but to heating.

The simplest are monoblock chillers. They compactly combine all the elements into one whole. They go on sale 100% complete up to the refrigerant charge.

This mode is most often used in large offices‚ public buildings‚ in warehouses. A chiller is a refrigeration unit that provides 3 times more cold than it consumes. Its efficiency as a heater is even higher - it consumes 4 times less electricity than it produces heat.

What is the difference between a refrigerant and a heat transfer fluid?

The refrigerant is a working substance, which during the refrigeration cycle can be in different states of aggregation at different values pressure. The coolant does not change phase states. Its function is to transfer cold or heat over a certain distance.

The refrigerant is transported by the compressor, and the coolant is transported by the pump. The temperature of the refrigerant can fall below the boiling point or rise beyond it. A heat transfer fluid, unlike a refrigerant, constantly operates at temperatures that do not rise above the boiling point at the current pressure.

The role of the fan coil in the air conditioning system

Fancoil - important element centralized air conditioning system. Second name - fan coil. If the term fan-coil is literally translated from English, then it sounds like a fan-heat exchanger, which most accurately conveys the principle of its operation.

The design of the fan coil unit includes a network module that provides connection to the central control unit. Robust body hides structural elements and protect them from harm. Outside, a panel is installed that evenly distributes air flows in different directions

The purpose of the device is to receive media with a low temperature. The list of its functions also includes both recirculation and cooling of the air in the room where it is installed, without the intake of air from outside. The main elements of the fan-coil are located in its body.

These include:

• centrifugal or diametral fan;
• heat exchanger in the form of a coil consisting of a copper tube and aluminum fins mounted on it;
• dust filter;
• Control block.

In addition to the main components and parts, the design of the fan coil unit includes a condensate trap, a pump for pumping out the latter, an electric motor, through which the air dampers are rotated.

On the picture channel fan coil brands of Trane. The performance of two-row heat exchangers is 1.5 - 4.9 kW. The unit is completed low noise fan and compact body. It fits perfectly behind false panels or suspended ceiling structures.

Depending on the method of installation, there are ceiling, channel, mounted in channels, through which air is supplied, unframed, where all elements are mounted on a frame, wall-mounted or console.

Ceiling devices are the most popular and have 2 versions: cassette and channel. The first are mounted in large rooms with false ceilings. Per suspended structure position the body. The bottom panel remains visible. They can disperse air flow on two or all four sides.

If the system is to be used exclusively for cooling, then the best place for him - the ceiling. If the design is intended for heating, the device is placed on the wall in its lower part

The need for cooling does not always exist, therefore, as can be seen in the diagram that transmits the principle of operation of the chiller-fincoil system, a container is built into the hydraulic module, which acts as an accumulator for the refrigerant. thermal expansion water is compensated by an expansion tank connected to the supply pipeline.

Fancoils are controlled both in manual and automatic modes. If the fan coil is working for heating, then in manual mode cut off the cold water supply. When working, it is blocked for cooling hot water and open the way for the flow of the coolant working fluid.

Remote control for both 2-pipe and 4-pipe fan coil units. The module is connected directly to the device and placed near it. The control panel and wires for its power are connected from it.

To work in automatic mode on the panel set the desired for specific premises temperature. The specified parameter is supported by thermostats that correct the circulation of coolants - cold and hot.

The advantage of a fan coil unit is expressed not only in the use of a safe and cheap coolant, but also in the rapid elimination of problems in the form of water leaks. This makes their service cheaper. The use of these devices is the most energy efficient way to create a favorable microclimate in a building.

Since any large building has areas with different requirements for temperature regime, each of them must be served by a separate fan coil unit or a group of them with identical settings.

The number of units is determined at the design stage of the system by calculation. The cost of individual components of the chiller-fan coil system is quite high, therefore, both the calculation and the design of the system must be carried out as accurately as possible.

Conclusions and useful video on the topic

Video #1 Everything about the device, operation and principle of operation of the thermoregulation system:

Video #2 About how to install and commission the chiller:

The installation of a chiller-fan coil system is suitable for medium and large buildings with an area exceeding 300 m². For a private house, even a huge one, the installation of such a thermoregulation system is an expensive pleasure. On the other hand, such financial investments will provide comfort and well-being, and this is a lot.

Please write your comments in the box below. Ask questions on points of interest, share own opinion and impressions. Perhaps you have experience in the field of installing a chiller-fan coil climate system or a photo on the topic of the article?

One of the most modern systems heating and air conditioning for private houses is a chiller-fan coil system. This system will allow you to create a favorable microclimate in your home, maintain the freshness of the air, and preserve the health of the household. This system especially stands out against the background of traditional split systems, so we will talk about its features in this article. First, consider the structure of the system as a whole, then we will touch directly on fan coil units.

The main purpose of the chiller-fan coil system is air conditioning. It consists of two main parts: a chiller and a fan coil. A chiller is a device that is directly responsible for heating or cooling, and a fan coil is essentially an air conditioner that serves to cool or heat the air in the room in which the fan coil itself is located.

Unlike a conventional air conditioner, the refrigerant does not circulate through the fan coil, often water or non-freezing liquid circulates through it. As for the chiller, it can work, for example, on solid fuel or work on a heat pump system.

In addition to the main parts, the system contains: a hydraulic module, automation, connecting elements, storage and expansion tanks, coolant and refrigerant. The hydromodule is, in fact, a pumping station, the task of which is to ensure the movement of the coolant in the system. Automation provides control and regulation of the system during its operation.

Connecting elements are pipes that connect parts of the system, units, to each other. Ethylene glycol is used as a coolant (for regions with cold or temperate climate) or water (for regions with a hot climate). The refrigerant is gas, often freon.

The distinctive advantages of the chiller-fan coil system lie in a number of its features.

Firstly, the system is very easy to maintain - filters can be easily removed, cleaned or changed.

Secondly, it is possible to install several fan coil units (in separate rooms), while the chiller operates alone for the entire system, and the number of fan coil units is determined only by the chiller capacity.

Thirdly, the chiller is installed immediately in one specific place, it does not require several places, that is, it does not eat up a lot of space.

Fourthly, well-organized thermal insulation of pipes will allow transferring the coolant to long distance, that is, heated or air-conditioned rooms may be located far from the chiller.

During installation, ordinary pipes are used, standard shut-off valves, typical automation. The system is environmentally friendly, if a solution of ethylene glycol in water and has some toxicity, then in the event of a leak, a person will instantly begin to cough, and leave the room - it will be safe. As for the refrigerant, it circulates only in the chiller, that is, in the block in the attic or on the roof - outside the living quarters. Such a system allows you to combine both heating and supply and exhaust ventilation at a relatively low installation cost.

The coolant entering the chiller is heated or cooled, just as it happens in an air conditioner. Water or non-freezing liquid, which serves as a heat carrier, is supplied to the fan coil units by means of a pumping module, where the room air is mixed with the air of the unit, using a fan installed inside.

The heated or cooled coolant gives or takes heat from the room air, so the correct microclimate is achieved. This is the principle of operation of chiller-fan coil systems, which show themselves remarkably well as air heating systems for private houses.

The heat exchanger of the chiller itself is connected to the pump and the storage tank (accumulator), then an expansion tank is installed, and then the coolant is supplied through pipes to the fan coil units, while the control valves installed in the pipeline set the system to the correct mode.

For a particular house, the system design is developed by specialists individually, and if somewhere the chiller can only be installed on the roof, then otherwise the attic is best suited for placing the chiller. When designing, all the features of the premises, backyard infrastructure and the requirements of households for the microclimate are taken into account. The type of chiller is selected individually, as well as the number of fan coil units, depending on the intensity of the load and on the individual requirements of the customer to the features of the system operation modes.

The devices included in the system can work together or separately, again depending on the type of system. Chillers are reversible, vapor compressor or absorption. The reverse chiller is capable of both heating and cooling. The steam compressor will remove heat from the coolant circulating inside the unit into a special chamber.

And the absorption one will be able, by changing the state of aggregation of the liquid, to take away heat from it, or vice versa - to heat it; the absorbent transfers heat to the consumer. Cooling can be air or water, and the cooling circuit is remote. Directly, fan coil units are cassette or channel, wall, floor or ceiling.

When choosing a system, it is important to evaluate following parameters: chiller power, fan coil capacity, pumping station power, pipeline length, pipe insulation. So the chiller-fan coil system can be designed for any building, not only for a private house, but also, for example, for a supermarket or hotel.

To date, an indisputable fact is that heating a room using a household, semi-industrial split system, as well as any kind industrial air conditioner much more efficient than conventional electric heaters. However, as the outside temperature drops, the efficiency decreases. Therefore, I would especially like to highlight the use of the chiller-fan coil system for space heating.

How is fan coil heating done? In this direction, a special group of equipment has been allocated, designed specifically for heating, and this equipment is called - heat pumps. It should be noted that absolutely all types of fan coil units (wall, cassette, duct, floor-ceiling) can heat the air, but it must be borne in mind that warm air from the fan coil will rise up and the location of the fan coil at the top will have a bad effect on heating. This applies, to a greater extent, to channel and cassette fan coil units. For better efficiency heating, fan coil units with a lower location or with an adjustable air outlet in height should be selected. The very possibility of working on heating does not depend on the design of the fan coil unit. If the fan coil unit is paired with a chiller that can work to produce cold and heat, then the fan coil unit can also work to heat the air. If the chiller is designed only for cold operation, then, accordingly, the fan coil unit can only work for air cooling.

In most cases, fan coil units are made with two pipes, and they also have one heat exchanger inside the fan coil, and they are most often used. However, many manufacturers also produce four-pipe fan coil units that have two heat exchangers inside and these heat exchangers can each work in their own mode, independently of each other. At the same time, each heat exchanger is connected to its own chiller or any other system that preliminarily prepares (heats / cools) water for further supply to fan coil units. These heat exchangers operate independently of each other. As such a system for one heat exchanger, you can use an individual boiler or connect to central heating, if any, and connect the other to the chiller.

Such fan coil units have wider functionality, but in this case, such four-pipe heat exchangers can be used to heat the air. The efficiency of using fan coil units as heating appliances much higher than from the use of conventional heating radiators precisely due to the use of built-in fans inside the fan coil and more efficient materials, in terms of heat transfer, from which the heat exchanger is made.

The very definition of "fan coil" is inseparable from such concepts as a chiller and a hydromodule. Only in isolated cases can the fan coil unit be used separately and work with other climatic equipment.

Fancoil as a chiller element

Initially, the fan coil unit was used only in combination with a chiller and was its integral part, and since this entire system worked to cool the air in rooms with large quantity rooms, then the fan coil was also intended only for cooling the air in the hot season. Water was used as the working medium that circulated from the chiller to the fan coil and back to the chiller. The provision of such a continuous flow was provided by the hydraulic module - its one or more pumps.

Over time, the processes of heat transfer were more deeply studied, and there appeared quite an informed decision- in addition to cooling the air, use fan coil units to heat the air. To implement this function, the chiller was equipped with a 4-way valve and other auxiliary elements. If in cooling mode the refrigerant in the chiller moves in the direction: compressor - condenser (most often air) - throttling device - evaporator (most often plate) - and again the compressor, then in heating mode the movement is in the opposite direction: compressor - evaporator - throttling device - condenser - compressor. It is in the evaporator, which in this case serves to condense the refrigerant, that it is taken from it a large number heat, which heats the water flowing further into the fan coil units to heat the air in them.

Such a function does not require a change in the design of the fan coil at all. As before, the fan coil unit includes a heat exchanger through which water moves, a fan that blows air over such a heat exchanger, a temperature sensor, a port for receiving an infrared signal from the control panel (if any), an air filter, a condensate collection pan and 3- x way valve (supplied separately).

Fan coil classification

Like other indoor units various systems air conditioning, regardless of the mode of operation, by location fan coils are:

• wall;
• cassette (single-flow and four-flow);
• cassette four-stream (standard and compact);
• channel (low - medium and high pressure);
• floor - ceiling

by design fan coil units are divided into:

• two-pipe and four-pipe;
• two-row, three-row and four-row;
• hull and non-hull.

by relative location fan coil units are divided into:

• horizontally installed;
• vertically mounted.

Fan coil efficiency

So there was a new name for a chiller that works on heat - a heat pump. In addition to using electricity or using natural resources to generate heat, another method of generating heat has been developed, and it is 2-4 times more efficient than direct use of electricity in heating devices. The heat, which subsequently goes to heat the air passing through the fan coil unit, is obtained as a result of the operation of the refrigeration circuit, and in particular, from the operation of the compressor during compression of the refrigerant. At the outlet of the compressor, the refrigerant can exit with a temperature of +60℃ to +100℃. This heat is further used to heat the water, which enters the fan coil, and then to the air. Since work on heat is provided for in winter period, then, to prevent freezing of water, it is changed to any liquid that does not freeze when low temperatures, then the same liquid will flow into the fan coil units. In such situations, the initial selection and calculations must be made specifically for the liquid that will be filled in the future. Changing from one fluid to another already during operation is prohibited. The efficiency of the heat supply system based on non-freezing liquids will be lower due to their increased viscosity, which entails additional resistance losses during heat transfer.

Where can fan coils be used for heating

All manufacturers manufacture chillers for both cooling and water heating, i.e., in most cases, they can operate in both cooling and water heating modes, while the temperature of the water supplied to the fan coil for air heating is usually +40…+55 ℃. There are some cheaper models that work only for cooling or only for heating. The latter have a special name - heat pumps. They are installed in private houses, cottages and provide water heating not only for heating, but also for plumbing and household needs. Fancoils are used as internal devices various types. Rapid air heating, intensive forced circulation and noiselessness put such fan coil units on the most high level among all possible heating devices. Fancoils can be used separately, independent of the chiller. This option is possible if there is some other source of water (liquid) heating, which is sent to fan coil units. The temperature of the water (liquid) in this case should not exceed +70 ℃, otherwise the fan coil will be damaged.