What are HVAC Systems?
HVAC stands for heating, ventilation and air conditioning systems. This system is responsible for heating and cooling your home and includes products like furnaces, air conditioners, heat pumps as well as ductwork, thermostats and other home comfort controls.What are VRF Systems?
Variable refrigerant flow (VRF) systems are an upgraded and enhanced version of multi-split systems causing simultaneous heating and cooling as well as heat-recovery capabilities. Modern VRF systems provide some major advantages, such as zoning (heating and cooling zone), separated temperature control, less ductwork, without any secondary fluids (chilled-water or hot-water), and other associated costs.More about VRF technology
VRF run on all-electric technology and consists of a single outdoor condensing unit, multiple indoor units serving various areas, refrigerant piping with branch selectors, and associated controls. VRF systems use R-410A refrigerant as the heat-transfer fluid and the working fluid, achieving a very high energy efficiency ratio (EER) of 15 to 20 and integrated energy efficiency ratio (IEER) of 17 to 25. They are 20% to 30% more efficient than conventional HVAC systems due to partial load operation, speed modulation, zoning capabilities, and heat-recovery technology.
VRF operations in relation to other HVAC systems
VRF has the ability to vary and control the refrigerant flow through multiple evaporator coils to provide individual temperature control in various mechanical comfort zones. Using direct expansion (DX) as part of the basic refrigeration cycle, VRF systems transfer the heat from the room directly to evaporator coils located within the conditioned space. The heat-transfer media, in this case, is the refrigerant, which delivers heating and cooling to various zones with less energy as compared with air or water. VRF systems act as multi-split systems, connecting multiple indoor units with one centralized outdoor condensing unit assembly, providing simultaneous heating and cooling and heat recovery in various areas.
The VRF system is best suited for applications with simultaneous needs for cooling and heating during the same mode of operation. Branch selectors are used as control devices directing the liquid refrigerant or gas refrigerant to particular zones requiring cooling or heating. In heat-recovery systems, the branch-circuit controller can take the heat recovered from the cooling zone and use it to warm up the room in heating mode. This way, the compressor cooling or heating requirements are reduced, which saves energy.
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