VRF systems are universal complexes for air conditioning of large areas. Multisonal VRF systems both heat and cool the air in the room. On average, an ordinary VRF system can work in a room with a volume of 150-500 m2. Such systems with an average market price cannot provide the whole set of climate parameters without any additional ventilation blocks. But they acquire such complex systems to solve a global problem in a comprehensive way. Definition of VRF systems - implies an individual approach to air conditioning in each room. In real time, the needs of each consumer per minute are taken into account. The VRV system is ideal for facilities with high demand for microclimate or high activity in rooms. Precise temperature control allows you to monitor changes in the VRV system and adjust its operation in order to economically support the parameters required for each user. Thus, the VRV system is an effective complex for air conditioning of one or another object.

Advantages of VRV, VRF systems:

1. VRV air conditioners save energy. This is possible thanks to special blocks with heat utilization of heat. This finishing work allows to heat and cool the air of different rooms at the same time.
2. Useful space saving. This is achieved by the compactness of the internal blocks of the VRV, and the high length of the connecting communications allows for maximum removal of the external modules of the system.
3. The VRV system operates in a high temperature range. Some systems can operate at -200C, and some narrowly specialized models can even operate at -500C.
4. Variety of design decisions:
   • The length of the pipelines increases the flexibility of designing systems at one facility or another.
   • Possibility of reproduction of the system after commissioning.
   • Possibility to replace obsolete VRV interior blocks when repairing or re-planning rooms.
   • Commissioning of the system in stages.
5. The comfortable operation of the VRV is based on the low noise characteristics, as well as the control system, which consists of controllers and consoles.
6. Simple installation:
   • Installation of blocks on each floor
   • Commissioning of the system without commissioning

Chiller-fancoil systems differ from all air conditioning systems in that water (or non-freezing liquid) circulates between the indoor and outdoor units, rather than freon. The chiller is a refrigeration machine cooler designed to cool water and liquids. Chiller is an ordinary freon air conditioner through which water passes, not cooled air from the evaporator. This water enters the fan coils through a system of heat-insulating pipelines with the help of a pumping station. Fancoils are installed in air-conditioned rooms and play the role of internal blocks of split-systems. Chiller-fancoil systems have a number of advantages over traditional multsplit or multisonal systems:

Advantages;

• Large scale. The number of fans (loads) per cent of the central refrigeration machine (chillers) is almost limited only by its efficiency.
• Minimum volume and area. The air conditioning system of a large building can contain a single chiller that occupies a minimum volume and area. Due to the absence of external units of air conditioners, the appearance of the facade is preserved.
• Unlimited distance between chillers and fancoils. The length of the tracks can reach hundreds of meters, because the specific loss of the track length meter during the high heat capacity of the liquid heat carrier is less than in gas-fired refrigerant systems.
• The value of the pliers. For connection between chillers and fan coils, use ordinary water pipes, connecting fittings, etc. It is used. Balancing water pipes, that is, equalizing the pressure and water flow rate between separate fan coils, is easier and cheaper than with gas-filled systems.
• Security. Potential volatile gases (gas refrigerant) are usually concentrated in chillers installed outdoors (on the roof or directly on the ground). The risk of pipe failure inside the building is limited by the risk of flooding, which can be reduced with automatic shut-off valves.

Disadvantages:
Chiller-fancoil systems are not ventilation systems - they cool the air in every air-conditioned room, but in no way affect the air circulation. However, it is possible to apply a pipe water cooler installed in the flow unit. It is possible to combine both pipe water coolers and different types of internal fan coils in one chiller, which produce additional heat flows. Chiller-fancoil systems are more cost-effective than cap systems in terms of electricity consumption, but they certainly lose out in terms of cost-effectiveness to refrigerant variable consumption systems (VRF). However, the capacity of VRF systems is limited (the volume of rooms cooled to several thousand cubic meters).

Types of chillers:

• Chillers with built-in air condenser and axle fans
• Chiller with built-in air condenser and centrifugal fans
• Chillers with continuous air condenser
• Continuous air condenser with axial fans

Modern chillers are produced in a wide range of power - from 5 to 9000 kW, which allows you to condition both small cottages and multi-storey buildings. All freckles can be distinguished by the following main features:

• According to the type of condenser cooling
• With water and air cooling

Air cooling is performed in the same way as in domestic air conditioners - the condenser is filled with air flow from the fan. During water cooling, the condenser is cooled by running water. The second method helps to significantly reduce the size and cost of chillers, but requires the use of running water or the installation of gradients (circulating water supply systems).

• When there is a heating mode - with or without heat pump (reversible). Models with a heat pump not only cool the heat carrier, but also heat it.
• By design - with built-in or removable capacitor. Air-cooled chillers can be monobloc (with built-in condenser) or removable condenser. In the first case, the chiller is an autonomous cooling machine that connects only the pipes from the pump station. In the second case, the capacitor is made in a separate block. This allows the freckles to be placed inside the room and the condenser to be removed from the roof. This solution simplifies the maintenance of freckles and increases its reliability due to the stable temperature in the room. In addition, since the chiller itself and all the pipes that carry heat are inside the room, the use of non-freezing liquid can be avoided and water can be used as a heat carrier without draining it during the winter.
• Air-cooled monoblock chillers can have axial or centrifugal fans. Arrow fans are cheaper, but create less air pressure. Therefore, chillers with an axial fan should be installed only in open areas - on the roof, walls of the building, etc. can be placed. Centrifugal fans create stronger air pressure. Therefore, chillers with such fans can be placed indoors, allowing air to escape through the fence and air duct. In addition to traditional freon chillers, absorption chillers are also available. Such chillers use water and an absorber (lithium bromide) instead of freon. The circulation of absorption cooling is similar to the circulation of freon. When heat is transferred from a vapor-like state to a liquid, the effect of its absorption by the refrigerant is used. In the process of absorption chillers, the following occurs: under the influence of an external heat source (gas burner, steam or hot water), refrigerated (water) vapor is released from the concentrated solution of lithium bromide transported to the condenser. Here they are condensed into the liquid entering the evaporator. Water evaporates in the evaporator, and its vapors are absorbed by the absorber sweat (concentrated solution of lithium bromide). The mixed solution of the absorber is then heated and the whole cycle is repeated. It is a source of energy for hot water or steam absorption chillers. Therefore, they are usually used where there are severe restrictions on the amount of electricity used. Due to the lack of development of energy storage technology, absorption chillers could not be widespread in Russia. Such freckles, as a rule,

• Multi-split air conditioners mean many parts. In the cooling system, the internal blocks are connected to a single external block. In this way, it is possible to avoid the difficulty and visual pollution in the area formed by the external blocks.
• Multi-split air conditioners are available in different interior block options such as wall, cabin, floor-ceiling type. In addition, there are 8 multi-split air conditioner models that connect one indoor unit to one outdoor unit. Each built-in module can be managed independently of each other.

Multi-split air conditioners are used:

• In residences and workplaces
• in stores
• In shopping malls
• In schools
• In hospitals
• In meeting and concert halls

Multi-conditioner differs from other systems in terms of features. Provides detailed control, multiple control systems at the same time, design flexibility, easy installation and maintenance, quiet operation system and superior performance due to high energy saving and single centralized control.

© 2021 - Xan Construction. Created by NC GROUP