AIR-CONDITIONING SYSTEMS

Comfort conditioners are used for adjustment and automatic maintenance of air temperature, relative humidity, cleanliness and air exchange rates in accordance with applicable hygiene and sanitary requirements. As to their structure, the air conditioners can consist of one unit (mono-block) and two or more units (split systems and multi-split systems). The conditioners pertain to the same model range but differ in performance and design capacity.

Window — air-conditioners consist of one unit; a vaporizer and condenser are located in a single package unit. Ordinary air-conditioners can cool air only; more complicated air-conditioners have a heating mode and remote control. Rating of such air-conditioners is 1,5 to 9 kW. The air-conditioners are installed into window openings, high qualification is not required to install them.

Split Systems — the external unit is located outdoors and is secured to a building wall, balcony, onto a roof and other structures blown through by wind; the internal unit is located inside a building. The external and internal units as the integrated system are interconnected with special pipes. Various types of internal units of split systems are available. All modern split systems include a remote control with a liquid crystal display. Using the remote control, you can set any indoor temperature required; set a timer for automatic switch-on and switch-off of the conditioner at preset time; adjust air flow direction, etc.

Wall-mounted — air-conditioner is the most common and affordable conditioner. You can install it in any small room in any office, apartment and shop. Rating of wall air-conditioners is 2 to 9,4 kW, that covers area of 15 m² to 70 m².

Multi-split system — consists of one outdoor unit and two or more indoor units located in different separate rooms. They are controlled with remote controls independently.

Ceiling and wall air-conditioners — Capacity of such air-conditioners is 3,5 to 15 kW; owing to the structure of the indoor unit, you can mount them onto the ceiling, wall or floor close to the wall.

Cassette air-conditioners — False ceiling is required to install a cassette air-conditioner. A cassette chamber distributes cooled air through the lower part of the unit. Accordingly, the size of the lower part of such air-conditioner corresponds to a standard ceiling tile 600x600 mm and if rating is higher, the size is twice as large, 1200x600 mm. The lower part is covered with a false screen with guide louver. Ratings of such air-conditioners are 7 to 17 kW. The main advantage of the cassette air-conditioner is inconspicuous location as people can see the false screen only. One more advantage of such conditioner is uniform distribution of air flow in four directions and therefore one cassette conditioner is enough to cool a big room.

Duct air-conditioners — The indoor unit is installed in a space above the false ceiling. Cooled air is distributed through heat-insulated air ducts located in inter-ceiling space. Typical capacity of such conditioners is 7 to 18 kW, that is sufficient to cool a small office or 4-5 room apartments. A principal difference of the duct air-conditioner from any other split systems is supply of fresh air to the extent required to ventilate air-conditioned rooms in full. Such air-conditioner solves issues of both ventilation and air-conditioning of a whole office, apartment or cottage.

Column floor air-conditioners — are installed in large rooms: hotel halls, restaurants, conference-rooms and in other similar areas. They have big capacity (8 to 18 kW) and provide high air recirculation.

To create and maintain comfortable microclimate in cottages, multi-room apartments, offices, shops, etc., ROOMTOP packaged duct air-conditioners, multi-zone systems , end HVS systems are used.

ROOMTOP Packaged Duct Air-Conditioners
Rating of equipment of such class is within 7 to 29 kW. Such equipment is segregated into a separate group due to principal differences in its structure. Standard duct systems consist of indoor and outdoor units but this equipment is a mono-block of minimal vertical size. Two independent fan blowers of the condenser and vaporizer afford 90º turn and high air flow rate. Owing to the above characteristics, ROOMTOP can be installed directly above false ceilings in rooms (for example, in sales area, show-rooms, etc.). In addition, a problem of outdoor unit location is no longer relevant.
Major characteristics of ROOMTOP equipment:

Multi-zone systems Multi-zone systems are improved version of standard multi-split systems. In such systems dozens of indoor units can be connected to the single outdoor unit. Various types of indoor units of multi-zone systems (wall, duct, cassette, etc.) are available; they can have different capacity, 2 to 25 kW in general.
Maximum distance between the indoor and outdoor units (pipe length) is 100 meters. Height difference between the indoor and outdoor units (vertical distance between the units) is 50 meters. Thus, it is possible now to place the outdoor unit of the air-conditioner in any convenient area (roof, basement and even in the area located dozens meters from the building). The indoor units can be controlled with both individual remote controls and the central control panel managing operation modes of each indoor unit and system status on the whole, and a personal computer.

HVS-system — are a breakthrough in air-conditioning technologies. They are peculiar alternative to big chillers and large duct split-systems. They are the most environmentally safe air-conditioners as minimum freon is used in them. HVS systems are equipped with the intelligent control system providing continuous operation monitoring of the equipment. Freon is used in a condenser circuit of the shop-manufactured outdoor unit only. As to their structure, the systems consist of two units: the outdoor unit is a condensing mechanism cooled with air; the indoor unit consists of a hydraulic module integrating a battery, water pump, duct relay, etc. HVS components can be located on top, below or at any of the floors according to architectural peculiarities of the building and their target. They can work in conjunction with fan coils of different types and central air-conditioners depending on the client’s requirements and architectural peculiarities of the building. Provided that a proper water pump is selected, any pipe length (distance from the chiller to the fan coil) may be used.

Chiller-fan coil, central and roof (ROOFTOP) , systems are used in big rooms and buildings.

Chiller-fan coil systems
Chiller and fan coil systems are intended for independent adjustment of temperature in some rooms at the same time, for example, in hotels, business centers, modern apartment houses, etc. They consist of a CHILLER, FAN COILS, HYDROMODULE and piping. Chiller is a refrigerating machine intended for cooling any liquid (water, non-freezing liquids). Developing Fan Coil is equivalent to the internal air-conditioner unit but it uses liquid cooled by the chiller and not freon. Hydro-module is an assembly providing circulation of liquid from the chiller to fan coils through pipes. Thus, the chiller-fan coil system has the following advantages:

Central Air-Conditioner
Central conditioner is used to cool/heat, filter and supply air through air ducts to one big or some smaller rooms. It consists of typical sections, each performing its function. Central air-conditioners are classified as direct-flow air-conditioners and recirculation air-conditioners. The direct-flow air-conditioners treat outside air only. The recirculation air-conditioners treat a mixture of outside and recirculation (exhaust air). The central air-conditioner provides not only air cooling or heating but performs functions of combined extract and input ventilation, an air purifier and humidifier. The heat utilization air-conditioner reduces heat energy consumption arising as a result of air heating during winter season significantly. The central conditioner requires complex installation due to pipes and air ducts laying in the building.

Roof-Mounted Air-Conditioner
Roof-mounted air-conditioners (ROOFTOP) are refrigerating machines consisting of mono-blocks intended for simultaneous ventilation and temperature adjustment in the room. Such conditioner shall be installed at flat roofs or special structures, if the roof is sloped, and can be installed at the foundation of the building. The conditioner is used for air-conditioning and ventilation of big supermarkets, sports facilities and conference-rooms. Fresh air is taken from outside through intake grills, recirculation air is taken from the room through air ducts system and is brought to a mixing chamber where it is mixed up with fresh air. Then the air is supplied from the mixing chamber through the filter to the heat exchanger where it is cooled or heated. Then fan blowers feed the air into the air ducts distribution system. Roof-mounted air-conditioners have the following advantages: wide range of heat and cool ratings, easy-to-install, packaged installation, highly reliable and economical units, a common control system and low noise performance.

Precision conditioners are related to process equipment category. They are designed to provide continuous and all-the-year-round operation during a long period of time and intended to develop and maintain microclimate parameters of process facilities requiring high accuracy. Such conditioners are used in:
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Liebert-HIROSS Company produces precision conditioners of any types:

 

SUPERCHILLER

HIMOD (4 to 130 kW)
HIMOD precision conditioning systems including a remote condensing unit (split-system) are designed to provide maximum flexibility in process environment. The range includes the following models: Freecooler, Dualfluid, Constant. All of them have standard functionality sets meeting any exacting and various users’ requirements.

НISР (4,5 kW -14 kW)
HISP is a split-system for process facilities and telecommunication areas. It is mounted to the ceiling of any target room (ceiling system). It has an option of cooling the room with a mixture of outside and recirculation air (Freecooling). It includes anti-corrosion copper tubes with aluminum fins and special coating. They have a built-in evaporator (SE, split-evaporator) and external single condensing section (SC, split-condenser).

HIWALL (4 kW -20 kW)
Mono-block conditioner installed outside. Owing to its packaged structure, it can be mounted directly to a wall that provides high operation flexibility. Being designed for operation in severe environment outside a telecommunication section, HIWALL has a reliable enclosure vandalism protected; built-in functions of natural and emergency cooling are standard options.

HILINE (З kW -16 kW)
HILINE conditioners (mono-block air-conditioners installed indoors) are packaged units installed in working areas. HILINE units which are available in two versions - with upper and lower blow – produce high rated air flow due to new-structure fans providing air discharge outdoors directly or through flexible air ducts. Spiral compressors and a built-in condensing system with the additional free cooling element consisting of a modulation valve and a return valve preventing intake of air discharged outdoors are used in a cooling circuit with direct expansion mode.

SUPERCHILLER 2000 (48 kW -171 kW)
МАТRIX (350 kW -1200 kW)
SUPERCHILLER 2000, MATRIX chillers manufactured by Liebert-Hiross Company are packaged air cooled chillers having additional built-in coils free cooled with outdoor air.

Any precision air-conditioner includes MICROFACE EVOLUTION microprocessor-based controller. Such controller can operate based on parameters of other 16 Microface controllers; that is defined as “distributed intelligence” meaning that modules work as a common “team” where each “player” has its own function. That makes the system to be highly economical, easy-to-use and efficient. In addition, precision air-conditioners provide monitoring through ETHERNET, INTERNET and GSM links.