Vrf Air Conditioning System

Product Details:

Multi-split air-conditioning systems, or variable refrigerant flow (VRF) systems, are relatively not very new in the our market, although other have been used in many countries in Europe and Asia for more than 25 years. The known benefits of VRF systems include (1) easier modular installation (particularly beneficial for building retrofit); (2) space savings, with multiple indoor units connected to one outdoor unit; (3) ability to respond to fluctuations in space load conditions; (4) easier and more cost-effective maintenance and commissioning; and (5) energy efficiency. However, several studies show that there are concerns for the application of VRF systems in the United States, including (1) lack of awareness of energy-efficiency advantages, (2) higher initial cost, and (3) code compliance issues specific to the United States. These concerns need to be resolved to expedite the market penetration of VRF systems in United States. To address the concerns regarding VRF systems, there have been numerous studies of multi-split VRF systems since their introduction. Most studies were performed as field and chamber experiments and/or energy modeling analyses to verify the energy efficiency of VRF systems. In general, field experiments were performed with a set of VRF indoor units and an outdoor unit, and their energy consumption and performance were analyzed in real buildings under several different scenarios (e.g., varying indoor loads, control mode variation, and ventilation impact). The field studies verified the measured cooling/heating performance of the VRF systems under those various conditions, but it is relatively hard to compare VRF performance with that of other heating, ventilation, and air-conditioning (HVAC) systems in the same building. Energy modeling studies have often been used to compare VRF system performance and other HVAC system performance in a building under the same conditions. Sometimes modeling studies use generic building models to compare the performance and energy consumption of VRF and other HVAC systems or use a calibrated model for the same analysis. Although the latter would provide better analysis results than the former, the latter is still limited in predicting the precise energy consumption of the alternative system in real buildings because of uncertainties in the model algorithm itself and with regard to human behavior and the operational schedules of the building

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