Abstract:

There are many heating and cooling systems today. The variable cooling fluid dive (VRF) air conditioning system is one of them.  These systems can be used both as a cooling system and as a heat pump. Thanks to this feature, the use in buildings such as hotels, schools and hospitals that need different weather conditions at the same time is prominent. In addition, the ability to both heat and cool at the same time contributes to energy savings. Another important advantage of these systems is that several internal units can work with one external unit. In this study, entropic formations and exergy losses occurring in different working conditions of the variable cooling fluid dive (VRF) air conditioning system, in dive and cooling fluids are calculated. The outcomes resulting from these losses have been identified. In addition, the exergy analysis was carried out by taking into account the thermo-economic analysis of the system and exergy. The study has determined the most efficient working conditions of the VRF systems and the cooling fluids that make the minimum exergy loss. When taking into account the working conditions and cooling fluids, the exergy axis cost of the system is calculated. As a result of the analysis, it has been explained that the condition in which VRF systems simultaneously heat and cool is the most efficient working condition. It has also shown the exergy efficiency and exergy axis cost impact of the cooling fluid and cooling fluid debt.

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