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vrf system in delhi

Posted on Apr 02,2014 by Admin
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Variable refrigerant flow (VRF) is an HVAC technology.[1] VRF comes in two system formats, Heat Pumps(HP),two pipe system, that have heating and cooling mode just like a standard HP. Since a VRF system will generally have 2 or more Indoor Units Unit's(IDU), HP IDU's will all be in cooling or in heating together. The second style system is the Heat Recovery (HR), three pipe system, that has a special box that controls the flow of suction gas and hot gas through the evaporator, indoor, coils. By switching from suction gas in the coil to hot gas, the indoor unit can be switched from cool to heat while other IDU's remain in cooling mode. While this adds to the first cost this allows for zone by zone selection of cooling or heating as desired by the occupant. The heating mode also allows for a increase in overall efficiency when used simultaneously with cooling on a single system. This increase is accomplished since the heating units is functioning as a condenser providing sub-cooled liquid back into the liquid line that is used by cooling IDU's. VRF uses refrigerant as the cooling and heating medium, and allows one outdoor condensing unit to be connected to multiple indoor fan-coil units (FCUs), each individually controllable by its user, while modulating the amount of refrigerant being sent to each evaporator. By operating at varying speeds, VRF units work only at the needed rate allowing for substantial energy savings at partial-load conditions. Heat recovery VRF technology allows individual indoor units to heat or cool as required, while the compressor load benefits from the internal heat recovery. Energy savings of up to 55% are predicted over comparable unitary equipment.[2] [1] VRF is typically implemented with the use of an Air conditioner inverter which adds an DC inverter to the compressor in order to support variable motor speed and thus variable refrigerant flow rather than on/off operation. An engineer estimated in 2009 that a VRF system cost 20 to 40 percent more than a traditional split/heat pump HVAC system to install, but opined that operating costs are potentially 20 to 50 percent lower then traditional systems. He speculated that the cost differences might be recovered in five years.[3]
2 comment on “vrf system in delhi”                                                
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Apr 05,2014
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Apr 05,2014
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