Central air conditioning system

Called central air conditioning system serving a few or one large room. Various types of central air conditioners: the type PACKAGED, sectional, self-contained, multizone central air-conditioning. Consider some of them. PACKAGED type air conditioners air conditioning systems such as PACKAGED from the indoor unit cabinet type (sometimes called columns) are used to treat the air in large rooms (concert and conference rooms, shops, restaurants, manufacturing facilities, computer rooms, waiting rooms, ticket halls). By way of feeding the treated air installation of this type are divided into air-conditioning, feeding processed air pressure in the ducts of the ventilation system and air conditioning, feeding processed air directly into the amount of serviced premises. Multizone central air-conditioning in the early 80-ies a number of leading in the field of air conditioning companies (Daikin. HITACHI. Mitsubishi Electric, Mitsubishi Heavy Industries, Matsushita (Panasonic / National), and others) have developed a new product in a comfortable air-conditioning - the so-called system Variable refrigerant flow (VRF), or multizone system successfully combines the advantages of autonomous local and central air conditioning systems. Treatment of air in the room is served by the indoor unit, similar in technical capabilities and consumer qualities of the indoor unit of household or a semi-split systems. Group of indoor units (various types and capacities) is attached to the outdoor unit system of insulated copper piping. The system is completely sealed and does not require refueling coolant. As standard refrigerant used Freon R-22. Control and regulation of temperature and humidity of air parameters is carried out individually for each room. There are several series: The most simple series with the possibility of indoor units only for cooling or drying. These series are produced only by a few firms-manufacturers (such as Daikin, Sanyo) and are not widely known because of the inability to heat the premises serviced during the transition periods of the year. System with the ability to work both on cooling (drying) and heat pump operation (Heat Pump). All internal components of a system of work or in cooling (drying) PLI in the heating mode. This version is standard and most common for VRF-systems. Such systems are often called double-tube because of the outdoor unit are 2 pipes (gas and liquid). System with the possibility of simultaneous operation of indoor units for cooling (drying), and for other areas - for heating in a heat pump. Due to the transfer of heat from the refrigerated space in the heated, these systems operate with the recovery and are called Heat recovery. Structurally, such a system look a bit different than the standard 2-tube. Here, the outdoor unit is connected with a group of indoor units is not directly but through a special device to switch modes. In this case, the connection of external units and devices, mode switching is carried out on three pipelines (liquid, gas pressure and low gas pressure). Which determined the name trehtrubnyh for systems with heat recovery. Indoor units can support a variety of indoor individual temperature regimes. In the systems of different companies use different technical features that provide the connection to one outdoor unit from 2 to 24, the total cooling capacity of the system can reach up to 94 kW, vertical drop between indoor and outdoor units can reach 50 meters apply a variety of energy-efficient technologies: a multi-stage or modulating regulation of productivity (the vast majority of systems have inverter drive compressors), heat recovery (for a three-pipe systems), energy-efficient heating in a heat pump (for our country this is relevant only for transient periods of the year). Of particular note is that VRF-systems have a wide range of successful applications - both for several rooms of a small office or a cottage, and in high-rise building. VRF-systems have been developed as an alternative to central air conditioning system. Having all the advantages of central air conditioners. VRF-systems have several advantages over them, because: for placing equipment does not require any special computer room and the ventilation chamber, which saves valuable space of the building and its useful volume, there is no need for bulky insulated duct systems and air distribution, as is supplying only the health standards for oxygen; VRF-systems do not require constant maintenance and upkeep for the purpose of highly qualified service operation, the management system can be performed with a conventional remote control by an individual user, and with the central station (optional), and a separate demand conditioning system can be controlled from a personal computer system work extremely economical, since its performance at any given time corresponds to the thermal load on the premises by management (mainly through the inverter compressor drive), operating costs are always minimal, provided the maximum level of comfort because of the precise maintenance of temperature regimes; VRF-system standard equipped with highly powerful systems of self-control and self-test that shortens the time for certification, and if necessary - and for troubleshooting.