In order to independently calculate the necessary parameters of the cooling capacity of the chiller-fan coil system and select the optimal fan coil, you need to summarize all the heat entering the room, take into account many factors, circumstances, such as:
- How many people will be in the room on average;
- What is the purpose of the room functionally;
- Window and wall parameters (dimensions window openings, directionality to the cardinal points);
- The climatic characteristics of the region where the structure is located, the values of the temperature and humidity of the outside air, solar radiation etc.;
- Construction, thickness, thermal conductivity of external enclosing structures;
- The total approximate amount of heat that can potentially be emitted by devices and equipment located in the room or planned to be placed in the room (all computers, lighting devices, etc. must also be taken into account);
- The presence and parameters of the ventilation system;
- Temperature graph refrigerant (with a schedule of +10, +15 0 С, the cooling capacity of the fankyol is lower than at + 7, + 12 0 С).
Fan coil calculation methods
Academic
This principle of calculation gives the most accurate results but it also takes the most time and effort. As a rule, this method is used more for research than practical purposes: to study the processes of heat exchange, heating and cooling of air in rooms when different conditions using ventilation, air conditioning and heating systems. It is also applicable for calculating the main indicators of the chiller-fan coil system. All the factors described above in the article are taken into account, some more nuances, less significant factors are added to them. The calculation is performed using precise reference values of the thermal conductivity and heat transfer coefficients, with an i-d diagram, etc. Since this method takes a lot of time, especially without experience and special training, it is used only in cases where it is really justified.
Refined
This calculation is less accurate than the previous one, but much faster. For it, the averaged values of the quantities involved in the calculation are taken. This calculation method is usually used by technical specialists of companies when selling and installing fan coil units. Three types of performance can be determined:
- Explicit performance (all heat inflows excluding air humidity);
- Hidden (all sources of heat inflow, taking into account air humidity);
- Full (both explicit and latent performance are taken into account).
To determine latent heat, use is made of i-d charts or the corresponding tables. At low values of air humidity, it is permissible to determine the total heat simply by increasing the calculated apparent heat by 20%. Where the humidity is high, the calculation of the latent heat must be carried out separately - otherwise, the calculation error can reach 50-60%.
Appraisal
This calculation is based on the area of the room. Meaning required power taken as 1 kW of cold for 10 m 2 of the room. Latent heat is usually not taken into account. However, with an air humidity of 40%, the latent heat can be more than 30% in addition to the sensible heat. Therefore, such a calculation will not give reliable results in worst cases may even cause the chiller-fan coil system to malfunction. However, this method is, in principle, admissible for calculating the system, for example, for residential premises. In office and residential premises with windows facing south or east, or large quantity equipment that generates heat, it is better to increase the design cooling capacity, calculated in this way by 25-50%, that is, take the specific heat emission equal to 125-150 W / m 2.
Desirably doing everything necessary calculations according to the cooling capacity of the system, lay an additional 10-15% of the reserve.
Moreover, when choosing a fan coil by power, be sure to pay attention to the units in which the manufacturer indicates the cooling power - it can be indicated in the usual W or BTU / h.
If you find it difficult to carry out calculations, or you are unsure of the correctness of the calculations, contact qualified specialists. In this case, a mistake can cost a lot of financial losses in the future.
Indoors large area filled with many sources of heat generation, the installation of air conditioners is irrational. To achieve comfortable conditions with less energy consumption allows the use of fan coil units. These are heat exchange devices consisting of a fan and a radiator, inside which water circulates. Before purchasing the equipment, its capacity is calculated. Depending on the degree of preparedness of the consumer, the calculations are carried out in an academic or simple approximate way.
How to choose the right fan coil power
The total capacity of the fan coil units must not exceed the capacity of the chiller
The chiller-fan coil system is one of the climatic equipment options for creating a comfortable microclimate in office, commercial, industrial and household premises... The equipment is designed for two modes: cooling in the warm season and heating in cold period... For multi-zone air conditioning systems, it is recommended combined option: the heat and humidity load falls on the fan coil units, and the ventilation ensures the purity of the air.
The main elements of the system: chiller - a machine for generating cold; and fan coil units - air conditioners or fan coils, which are heat exchangers. The heating medium is water or an ethylene glycol mixture. The hydraulic unit circulates the fluid in the pipeline. The purpose of fan coil units is to bring the air temperature in the room to the specified parameters.
The principle of operation of the device: the fan blows air through the heat exchanger. The cold coil reduces the flow temperature. Cooled air returns to the room. The process is accompanied by the loss of condensate, which is discharged to the drain.
Fan coil selection
The air conditioner is selected according to the total refrigerating capacity. Cooling costs are higher than heating power, so the calculation is based on maximum performance. Calculations require taking into account many parameters that affect the amount of heat and moisture released in the room:
- Receipt of sensible heat into the room:
- a) the location of the room and windows relative to the cardinal points;
- b) the number of people (with an average physical activity an adult generates 130-150 watts of heat);
- c) material, thickness and quality of wall and floor insulation;
- d) power lighting fixtures;
- e) heat generated during operation household appliances, computers.
- The climatic conditions are typical for the region in terms of temperature and humidity.
- Refrigerant temperature in the chiller-fan coil system.
- The presence of ventilation, the amount of fresh air flow.
- The functional purpose of the room.
Fan coil calculation methods
Heat loss at home
Having determined the total heat load in the room, they begin to calculate the power of the fan coil. Three calculation techniques are used. They are distinguished by the complexity of implementation and the accuracy of the results.
Academic
The most accurate calculation option that takes into account all possible parameters. The academic method involves a long and complex calculation process, a beginner will need 8-10 hours to choose a fan coil for a room with an area of 25-30 sq. m. The calculations carried out are similar to the studies carried out for the heat exchange processes of the air conditioning system. For work you will need:
- thermal conductivity coefficients of fencing materials;
- indicators of heat transfer of structural materials to the environment;
- moisture content and enthalpy (components of the id of the diagram).
When calculating air humidity and its processing, an id diagram is used. It contains several parameters:
- relative humidity;
- temperature;
- moisture content (amount of steam in 1 kg of air);
- enthalpy (amount of heat in 1 kg of air).
By connecting all the available indicators with lines, a diagram of the air condition is obtained. It is used by specialists to calculate air heating and a fan coil.
Refined
Technicians involved in the design of air conditioning systems carry out calculations based on the averaged values of the reference values. The method is less accurate than the academic one, but it gives a fairly reliable result. The calculation is carried out taking into account the effect of humidity on the power of fan coil units. Manufacturers in the characteristics indicate two performances: explicit and full. These parameters require explanation:
- Apparent performance of the device - takes into account all heat inflows in the room without correction for humidity.
- The total performance of the fan coil is the cold power used to compensate for sensible and latent heat. The second parameter is the heat of condensation of vapor into liquid. It is calculated using an id diagram or special tables.
With low air humidity, latent heat is up to 20%. Add this number to the apparent performance to get the full. With an increase in the humidity index, the proportion of latent heat increases to 50-60%.
Approximate or approximate
The simplest calculation option, which is offered by employees at the points of sale of air conditioning systems using fan coil units, who do not have professional selection skills. Calculations are fast with minimal set used parameters. Generalized preliminary calculations in the premises for various purposes provide the following data:
- for offices with office equipment and computers, an air conditioner-closer with a capacity of 150 watts for every 1 sq. m;
- a living space with a ceiling height of 2.7-3 m needs a fan coil with a cold performance of 100 watts per 1 sq. m area.
For example: the area of a room in an apartment is 20 sq. m - Q = 100 X 20 = 2000 W or 2 kW.
The final power is determined without taking into account the latent heat. In regions with a dry climate, the error is up to 20%, and with high humidity (80-90%), the error is within 50%.
Possible difficulties
Some HVAC equipment manufacturers indicate the cooling capacity of the fan coil not in the usual kW, but in BTU. British Thermal Unit stands for British Thermal Unit. The unit ratio is 1 kW = 3412 BTU / h.
The power of the devices for ease of orientation of buyers is indicated in rounded. For example: 7000 BTU / h = 2100 W.
Features of calculating a fan coil
Manufacturers' data on the production of cold air conditioner-coil unit are tied to standard temperature indicators:
- dry bulb 27 °;
- wet bulb 19 °;
- water at the fan coil inlet 7 °.
The variable factors include the fan speed, high is indicated in the characteristics. There is also medium and low. Among the factors that change will affect the performance of the fan coil unit:
- inlet water temperature;
- air flow (fan speed);
- the amount of water passing through fan coil;
- indoor air temperature.
Self-calculation electrical power fan coil units for an office or production hall can cause serious problems. This work is trusted by specialists. With a refined calculation helps online calculator on sites related to climatic technology... For household use approximate calculation is suitable for the device.
Fan coil unit is an element of the air conditioning system, similar in principle to indoor unit split systems. Since the fan coil unit is not stand-alone device and works only in the system, here we will not only consider the question of how to choose a fan coil comparing them different types and technical characteristics, but we will also touch on general principles choosing the best air conditioning system with fan coil units for your purposes.
The device and scope of fan coil units
The main parts of a fan coil unit are a radiator-heat exchanger, into which a coolant is supplied from an external source, and a fan associated with it. The fan coil unit can work both for cooling and heating - it all depends on the temperature of the coolant supplied to it. By changing the fan speed, you can adjust the performance of the device and the intensity of cooling or heating the air in the room without changing the temperature and flow rate of the coolant. Desired temperature the coolant is given during external device, most often in a so-called chiller, and then it is distributed throughout the system with a number of fan coil units.
- Chiller
- Pumping station
- Fan coil units
Water or antifreeze can be used as a heat carrier. When the system is operating for cooling, the use of antifreeze significantly increases its efficiency, since, unlike water, such a coolant can also be given a negative temperature.
A centralized air conditioning system using fan coil units is installed in large production halls, supermarkets or public areas, as well as in organizations with a large number of separate rooms, for example, in business centers. Choice centralized system conditioning in such cases gives significant savings in comparison with the use of a large number autonomous air conditioners, both in terms of the total cost of equipment and electricity costs.
Types of fan coil units - how to choose?
Fan coil units are divided by the type of functioning into two-pipe (single-circuit) and four-pipe (double-circuit), as well as by the type of installation: wall, floor-ceiling, cassette and channel.
- Two-pipe fan coil unit
It uses one heat carrier and, depending on its temperature, it can work either in heating mode or in cooling mode. The intensity of heating or cooling can be adjusted, but in order to switch from one mode to another, it is necessary to change the temperature of the coolant in the entire system. - Four-pipe fan coil unit
It has two independent heat exchangers, one of which is supplied with a cold heat carrier, and the other - a hot one. By directing the air flow to different heat exchangers, you can make such a device work for both heating and cooling, like a hot and cold water... A four-pipe fan coil unit is, in fact, two devices mounted in one housing, and therefore it costs much more. The complexity of the entire system, operating simultaneously on two circuits, also doubles. The choice of a two-circuit system is justified only in hotels, where each of the guests can have their own tastes. In most cases, a single-circuit one is quite enough, which will work for cooling in summer, and for heating air in all serviced rooms in winter. - Wall mounted fan coil units
They are very similar in design to conventional wall mounted air conditioners. They can be installed in any room, it is enough just to bring flexible pipes through which the coolant will circulate. They are equipped with a wired or wireless remote control from which you can adjust the intensity and direction, and for dual-circuit models - and the temperature of the air flow. Some models are equipped with a thermostat that automatically maintains the set temperature in the room. - Floor-to-ceiling fan coil units
Floor or ceiling mounted. Their installation is also simple and can be done in any room. The choice of installation on the floor or ceiling depends not only on the interior solution, but also on the mode in which the device will be used more often. It is better to install it at the bottom for heating, and at the top for cooling. Then the mixing of air in the room will occur in a natural way due to convection and will require less power supplied to the fan, which will not only save energy, but also reduce the noise level. - Cassette fan coil units
They are mounted in a false ceiling. This installation method allows you to easily hide all the wires and pipes, and when using ceilings with good sound insulation qualities, significantly reduce the noise level from a running fan. - Duct fan coil units
Install in the channel supply ventilation, which, like when installing cassette models, makes all structures and supplied communications invisible - only ventilation grill... But, unlike cassette ones, duct fan coil units do not require installation of suspended ceilings that “eat up” part of the room height.
Fan coil unit specifications
The main technical characteristic of fan coil units is their thermal power, which can be different in cooling or heating mode. Other important characteristics Is the capacity, which means the amount of air blown through per unit of time, and the effective length of the air stream. It is these characteristics that are taken into account when choosing a fan coil for the size of a particular room.
These devices consume electrical power only for the operation of the fans, and it is, as a rule, small, but if there are many such devices in the system, this can create a serious additional load to the power grid. In addition, many systems use the same control panel for all fan coil units, and the total power of the devices connected to it is limited.
It is also important that technical specifications like the noise level. Unfortunately, the fan is like any mechanical system, cannot work absolutely silently, and if these devices are installed in rooms in which people live or work, it is better to choose models with a minimum noise level.
How much and where to buy a fan coil unit
Given the variety of designs and models of fan coil units, it is difficult to talk about their prices at all - they vary very much. For example, only the prices for the most common channel models range from 15 to 40 thousand rubles.
You can buy a fan coil in our online store, where there are about 20 models.
Fan coil unit is a heat exchange equipment that is included in common system chiller-fan coil unit and is the final element of the entire circuit serving for cooling / heating air in closed rooms.
Fan coil selection
Depending on many factors, the calculation and selection of a fan coil is made. These factors include:- the number of people in the room;
- the purpose of the room;
- area and orientation along the cardinal points of window openings and walls of the room;
- the geographical location of the room with the temperature and humidity characteristics of the outside air;
- material and quality of external walls and ceilings;
- the number and power of lighting fixtures or other devices that are in the room and can generate heat;
- the presence of a room ventilation system.
Fan coil calculation methods
There are three ways to calculate a fan coil unit to create the required temperature background in the room. They can be called differently.Academic
This is the most accurate and time consuming calculation process. Such calculations are made in the course of scientific research or research on heat exchange processes for cooling / heating indoor air using air conditioning systems. The same method is applicable for fan coil units. All of the above factors and a few other less significant ones are taken into account in order to maximize all the nuances of the fan coil operation. In this case, the exact reference values of the coefficients of thermal conductivity, heat transfer of fencing materials, heat transfer coefficients from the walls to the inner and external environment... When calculating, the i-d diagram must be used humid air... With this calculation, without special training, you can spend a whole day selecting fan coil units for a room of 20-30 sq. m.
Refined
Such a calculation is performed by technical specialists, leading managers of companies that sell fan coil units and chiller-fan coil air conditioning systems. The calculation is not as accurate as in the previous case, but it is performed much faster and based on the averaged values of all reference quantities that can participate in the calculation. However, with such a calculation, it is necessary to calculate the performance taking into account the air humidity. Therefore, there are three definitions of performance:
- apparent performance, which takes into account sensible heat, i.e. all heat gains excluding air humidity;
- latent performance, which takes into account latent heat, i.e. all heat gains taking into account air humidity.
- full performance, which takes into account sensible and latent heat, i.e. all heat gains taking into account air humidity.
Latent heat is calculated with i-d charts or special tables.
In regions with low air humidity, it is possible to add 20% to the calculated apparent heat and obtain total heat. Thus, 20% will be allocated for latent heat. In regions with high humidity it is necessary to carry out a separate calculation of the latent heat. Otherwise, you can make a selection with an error of up to 50-60%.
Approximate (urgent, approximate)
Such a calculation is made by managers who sell fan coil units and chiller-fan coil air conditioning systems, but do not have the selection skills. It is made based on the area of the room. A fan coil unit with a cooling capacity of 1000 W is selected for every 10 square meters. with a ceiling height of up to 2.70 - 3 m.
Latent heat is almost never taken into account in such cases. And in regions with a humidity of 40%, latent heat is approximately 30% of the sensible heat, and with a humidity of 80-90% - up to 50% of the sensible heat. Such calculations can affect the operation of the entire chiller-fan coil system or lead to its breakdown, therefore, such calculations and selection of fan coil units must be trusted by trusted and qualified specialists.
The chiller-fan coil multi-zone climate system is designed to create comfortable conditions inside a large building. It works constantly - in summer it supplies cold, and in winter with heat, warming up the air to a given temperature. It’s worth getting to know her device, don’t 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 - external block‚Producing and supplying cold through pipelines with water or ethylene glycol circulating through them. This is what makes it different from other split systems, where freon is pumped in as a coolant.
For the movement and transmission of freon, refrigerant, expensive copper pipes... Here, they do an excellent job with this task. water pipes with thermal insulation. Its operation is not affected by the outside air temperature, while split systems with freon lose their performance already at -10⁰. The indoor heat exchanger is a fan coil unit.
It receives a liquid with a low temperature, then transfers the cold to the air in the room, and the heated liquid returns back to the chiller. Fan coil units are installed in all rooms. Each of them works according to an individual program.
The main elements of the system are - pumping station‚Chiller‚ fan coil unit. The fan coil unit can be installed on great distance from the chiller. It all depends on how strong the pump is. The number of fan coil units is proportional to the chiller capacity
Typically, such systems are used in hypermarkets, shopping malls, underground structures, hotels. They are sometimes used for heating purposes. Then, along the second circuit, heated water is supplied to the fan coil units or the system is switched to the heating boiler.
System design
According to the design of the chiller-fan coil system, there are 2-pipe and 4-pipe. By the type of installation, they are distinguished by wall-mounted, floor-standing, built-in devices.
The system is evaluated according to the following main parameters:
- the power or cooling capacity of the chiller;
- fan coil performance;
- the efficiency of moving the air mass;
- the length of the highways.
The last parameter depends on the strength pumping unit and the quality of pipe insulation.
Image gallery
Chiller and fan coil connection
The harmonious 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 value of the efficiency of the system drops significantly.
Each fincoil has an individual piping unit, by means of which its performance is regulated both in the case of heat and cold generation. The refrigerant flow rate in a separate unit is regulated by means of special valves - shut-off and control valves.
To direct the chilled water to the heat exchanger, one pipe is connected to the fan coil unit, and the other, to drain the liquid, to the chiller. The system design allows mixing of the refrigerant with the heat carrier
If the mixing of the heat carrier with the refrigerant must not be allowed. the water is heated in a separate heat exchanger and the circuit is supplemented with a circulation pump. To ensure smooth regulation of the flow of the working fluid through the heat exchanger, a 3-way valve is used when installing the piping.
If a two-pipe system is installed in a building, then both cooling and heating occurs due to the cooler - chiller. To increase the efficiency of heating with help in the cold season, a boiler is included in the system in addition to the chiller.
Unlike two-pipe system with one heat exchanger, 2 of these nodes are laid in a four-pipe system. In this case, the fan coil unit can work both for heating ‚and for 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 panel. If such a scheme is applied, the refrigerant never mixes with the heat carrier.
Since the temperature of the coolant in the system is heating season ranges from 70 to 95⁰ and for most fan coil units it exceeds the permissible value ‚it is preliminarily reduced. Therefore, ‚coming from the central heating network to the fan coil units‚ passes through a special heating point.
The main classes of chillers
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 steam compressor.
Absorption unit design
An absorption chiller or ABHM for operation 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 generated during operation industrial equipment... In this case, an absorbent absorber with a boiling point significantly higher than the corresponding parameter of the refrigerant ‚dissolves the latter well.
The operation diagram of a chiller of this class is as follows:
- Heat from an external source is supplied to a generator, where it heats up a mixture of lithium bromide and water. When boiling working mixture the refrigerant (water) is completely evaporated.
- The vapor is transferred to the condenser and becomes a liquid.
- Liquid refrigerant enters the throttle. Here it cools down and the pressure drops.
- 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.
- 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 completely in tune with current trends‚Concerning energy saving, therefore it has good prospects.
Construction of vapor compression units
Most of them operate on the basis of compression cooling. refrigeration units... Cooling occurs due to continuous circulation, boiling at low temperatures, pressure and condensation of the refrigerant in a closed system.
The 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 brought up to 80⁰.
Dry saturated steam in a compressed state goes to the condenser, where it is cooled to 45⁰ at a constant pressure and converted into liquid.
The next item on the way is the throttle (pressure reducing valve). At this stage, the pressure decreases from the value of the corresponding condensation to the limit at which evaporation occurs. At the same time, the temperature drops to approximately 0⁰. The liquid partially evaporates and moist vapor forms.
The diagram shows a closed cycle according to which the vapor compression unit operates. In the compressor (1), wet saturated steam is compressed until it reaches a pressure p1. In the compressor (2), the steam gives off heat and is transformed into liquid. In the throttle (3), both the pressure (p3 - p4) and the temperature (T1-T2) decrease. In the heat exchanger (4), the pressure (p2) and temperature (T2) remain unchanged
Having entered the heat exchanger - the evaporator ‚the working substance‚ a mixture of vapor and liquid ‚gives cold to the coolant and takes heat from the refrigerant‚ drying out at the same time. The process takes place at constant pressure and temperature. The pumps deliver low temperature liquid to the fan coil units. Having passed this way, the refrigerant returns to the compressor in order to repeat the entire vapor compression cycle again.
Specificity of a vapor compression chiller
In cold weather, the chiller can operate in natural cooling mode - this is called freecooling. In this case, the coolant cools the outside air. In theory, free cooling can be used at ambient temperatures below 7 ° C. On practice optimum temperature for this 0⁰.
When set to heat pump mode, the chiller operates for heating. The cycle is undergoing changes, in particular, the condenser and the 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. The chiller is refrigeration unit giving 3 times more cold than it consumes. Its efficiency as a heater is even higher - it consumes 4 times less electricity than it generates heat.
What is the difference between a refrigerant and a coolant?
A refrigerant is a working substance that, during the refrigeration cycle, can be in different states of aggregation at different meanings 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 refrigerant temperature can fall below the boiling point or rise beyond it. The heat carrier, unlike the refrigerant, constantly operates at temperatures that do not rise above the boiling point at the current pressure.
The role of fan coil in the air conditioning system
Fan coil unit - important element centralized climate control unit. The second name is a 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 fan coil unit is designed with a network module for connection to a central control unit. The robust housing hides the structural elements and protects them from damage. Outside, a panel is installed that evenly distributes air flows in different directions
The purpose of the device is to accept low temperature media. The list of its functions also includes both recirculation and cooling of air in the room where it is installed, without the intake of air from the outside. The main elements of the fan-coil are located in its body.
These include:
- centrifugal or cross-flow fan;
- heat exchanger in the form of a coil consisting of copper tube and aluminum ribs mounted on it;
- dust filter;
- Control block.
In addition to the main units and parts, the design of the fan coil unit includes a sump for collecting condensate, a pump for pumping out the latter, an electric motor, through which the air dampers are turned.
Pictured is a Trane duct fan coil unit. The productivity of double-row heat exchangers is 1.5 - 4.9 kW. The unit is complete low noise fan and compact body. It fits perfectly behind false panels or suspended ceiling structures
Depending on the installation method, there are ceiling ‚duct‚ fan coil units mounted in ducts through which air is supplied ‚open frame, where all elements are mounted on a frame‚ wall or console.
Ceiling devices are the most popular and have 2 versions: cassette and duct. The first ones are mounted in large rooms with false ceilings... Per suspended structure position the body. The bottom panel remains visible. They can disperse air currents on two or all four sides.
If you plan to use the system solely for cooling, then the best place for him - the ceiling. If the structure is intended for heating, the device is placed on the wall at the bottom of it
The need for cooling does not always exist, therefore, as can be seen in the diagram, transmitting the principle of operation of the chiller-fincoil system, a tank is built into the hydraulic module, which acts as a battery for the refrigerant. Thermal expansion of water compensates expansion tank connected to the supply pipeline.
Fan coil units are controlled in both manual and automatic modes. If the fan coil operates for heating, then the cold water supply is cut off in manual mode. When working, it is blocked for cooling hot water and open the way for the flow of 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 close to it. The control panel and wires for its power supply are connected from it.
To work in automatic mode, the temperature on the panel is set to the temperature required for a particular room. The set parameter is maintained by means of thermostats, which adjust the circulation of heat carriers - cold and hot.
The advantage of a fan coil is expressed not only in the use of a safe and cheap heat carrier, but also in the quick 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 zones with different requirements for temperature regime, each of them must be serviced 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 units 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. How to install and commission the chiller:
The installation of a chiller-fan coil system is advisable in 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 block below. Ask questions on points of interest, share your own opinions and impressions. Perhaps you have experience in the field of a chiller-fan coil climate system or a photo on the topic of the article?