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Air conditioners for information technology and communication - DISPLACEMENT PLANT TYPE AIR CONDITIONING SYSTEM WITH DISPLACEMENT MODE AIR DELIVERY (DISPLACEMENT) The basic concept of the air conditioning system with displacement air delivery is based on the natural convection principle, where the cold air is at the lower ambient zones, while the hot air is at the higher ones. This concept has been developed and applied by RC GROUP for the air conditioning in Telephone Exchangers and Hi-Tech. facilities. The modern Telecom devices have the aim of heat dissipation by air suction from the lower side close to the floor, for discharge from the top side. The air circulation inside the Telecom device can be in natural convenction mode or through internal fans. The RC GROUP free-cooling air conditioning system with displacement air delivery supplies the cold air directly into the room close to the floor with low air speed and intakes the air from the top side of the conditioner where the air temperature is higher. Therefore, the Telecom devices (to be cooled) intakes the cold air from the bottom and discharges the hot air from the top. The system and the extremely low air speed, cause a high air stratification with 10°C temperature difference between the coldest and the hottest zone. By hot air suction in the higher ambient zone, the air conditioner remarkably increases both the thermodynamic performance and the efficiency, with consequent working conditions and energy consumption optimization. CONVERSION OF DISPLACEMENT UNITS INTO DOWNFLOW AIR DELIVERY AIR CONDITIONING UNITS FOR AIR DISTRIBUTION THROUGH DOUBLE FLOOR (UNDER) “Kit under” optional allows the conversion of the Displacement units into Under air conditioning units. The air distribution is from the bottom by means of the plenum formed between the building floor and the raised floor. The air can be directly injected into the racks if these are opened at the bottom and properly sealed, in order to avoid any possible leakage in the environment. The cold air flows through each apparatus, cooling the electronic equipment. The air flow moves upwards, enters the bottom part of the apparatus and leaves from the top. The air conditioners is provided with an air inlet from the top, for air intake from the warmest area in the room improving the plant energy performances. The system prevents a strong mixture of the cold air injected into the room and the hot air coming from the racks, typical of upflow air conditioners. This solution is most favourable when the thermal load is uniformly distributed in all areas of the room. If the load distribution is not homogeneous, the position of the grilles and of the air outlet nozzles will have to be suitable to the existing load needs. The air conditioning unit draws the air to be cooled at a temperature higher than the one measured around the equipment to be cooled, obtaining higher thermodynamic performances. The air can also be distributed through grilles on the raised floor, in front of the racks rows. In this case the cold air is injected into the room near the equipment to be cooled; the equipment can draw autonomously the necessary cooling air. FREE-COOLING PROPORTIONAL SYSTEM For a further energy-saving, the RC GROUP conditioners are equipped with a proportional automatic free-cooling system in order to obtain free cooling when the indoor temperature is higher than outdoor one. Practically the fresh air is used as a refrigerant in order to cool the ambient, when the outside conditions allow it. - total free-cooling: only fresh air is used to cool the ambient; - partial free-cooling: the fresh air is used for a pre-cooling and the compressor or the chilled water are used to balance the load; - mechanical cooling: the compressor or the chilled water are used to cool the ambient. The outdoor air introduction into the room causes an increase of the inner pressure which must be avoided to grant a correct plant work. Therefore on ENERGY.SPLIT and PEGASUS units it is necessary to install an overpressure damper near the ceiling to allow the exceeding hot air discharge outdoor. On the contrary on packaged units it is not necessary to install the damper because the air is directly discharged by the unit. 80 RC GROUP SpA • General Catalogue• 155.EN.0504
INDEX ENERTEL.DX.A.DL • R134a • 6 ÷ 15 kW Packaged air conditioning units for hi-tech. facilities and telecom exchanges. PEGASUS.DX.A.DL • R407C • 5 ÷ 25 kW Air conditioning units with remote air cooled condenser for hi-tech. facilities and telecom exchanges. PEGASUS.CW.DL • 9 ÷ 55 kW Chilled water feeding air conditioning units for hi-tech. facilities and telecom exchanges. RC GROUP SpA • General Catalogue• 155.EN.0504 Air conditioning units for information technology and communication 86 DISPLACEMENT VERSION 88 90 81
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equipment and systems for air condi
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Introduction INFORMATION TECHNOLOGY
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Plus Points List PLUS POINTS 3Speed
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Plus Points List AIR CONDITIONERS A
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Company presentation 1963 the first
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Company presentation Patented IDROC
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Company presentation RC WORLD produ
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Company presentation Intelligent De
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References INFORMATION TECHNOLOGY M
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RC GROUP www.rcgroup.it RC GROUP S.
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