Ac Blower Motor Runs But Very Little Air Flow Variable Refrigerant Flow Systems: Advantages and Long Term Efficiency

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Variable Refrigerant Flow Systems: Advantages and Long Term Efficiency

Variable Refrigerant Flow (VRF) systems use refrigerants for both cooling and heating purposes. Refrigerants are substances that contain fluorocarbons and especially chlorofluorocarbons. However, due to their negative impact on ozone air quality and their contribution to ozone depletion, they are being replaced by other refrigerants containing ammonia, sulfur dioxide, propane. The ozone depletion effect of many of the common refrigerants used today is frequently debated.

A natural substance that can be used as a refrigerant is air. Air is commonly used for heating and cooling purposes in residential buildings, automobiles, and turbine-powered aircraft. Air also has many advantages, as it does not pollute the environment and is not dangerous to plants or animals. The main drawback that prevents its widespread use is that it is not very efficient. Also, if the outside air is humid, its cooling power will be greatly reduced. For that reason, air is not used in areas with high humidity. When the outside temperature is too hot, the cooling unit cannot cool the air enough to provide comfort in the indoor environment, even if the outside dew point is really low.

In a VRF system, there is a condensing unit outdoors which is connected to several fan coil units. Each unit of fan coil can be controlled independently and the amount of refrigerant sent to each evaporator is controlled by the users. VRF systems thus operate at different speeds depending on ambient temperature requirements, allowing them to operate under partial loading conditions and thus help in achieving energy efficiency.

In heat recovery VRF units, each of the indoor units can be controlled to heat or cool as needed, and the compressor load is favorably affected by indoor heat recovery. In VRF units, air conditioner inverters are used that support different motor speeds, to help achieve different refrigerant flow rates, without having to control the system by turning it on or off.

Companies manufacturing commercial air conditioners not only strive to achieve operational reliability and quietness of manufactured VRF systems, but also achieve high energy efficiency. Their VRF devices are suitable for large-scale use in a variety of commercial sites, such as shopping centers, hotels, etc. Such commercial appliances work to provide both cooking and heating of the ambient air at the same time. For the purpose, they use 2 pipe technology. The number of indoor units that can be connected to a single outdoor unit is as high as 60 units.

In terms of initial costs, it should be pointed out that VRF systems are more expensive to install than traditional split and heat pump systems. However, with a 10 percent difference in their course of operation, long-term costs prove to be lower. Hence the initial cost difference can be recovered during operation, thus proving VRF systems more efficient in the long run.

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