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  • Writer's pictureKai Zhang

Formula for the Ratio of Internal and External Units in a VRF System

Updated: Jun 16

The calculation and selection of the ratio of indoor and outdoor units in a VRF system are mainly based on the matching of the cooling capacity of indoor and outdoor units to ensure the efficiency and performance of the air conditioning system. The calculation formula for the ratio of internal and external units is: external unit power=total internal unit cooling capacity/1.3, while the calculation formula for over ratio is: over ratio=total internal unit cooling capacity/outdoor unit power * 100%.


VRF-external-units

The appropriate range of indoor and outdoor unit ratios is usually between 50% and 130%, which means that the proportion of indoor and outdoor unit cooling capacity can vary within this range to adapt to different usage scenarios and needs.


Not exceeding 130% of the overallocation ratio is in compliance with the overallocation standard for home decoration central air conditioning. If the over ratio is greater than 130%, although it may reduce the initial cost, it will cause the air conditioning unit to operate under overload, affecting refrigeration efficiency, increasing power consumption, increasing failure rate, and shortening service life.


vrf-external-internal-units

Therefore, selecting the appropriate ratio of internal and external units is the key to ensuring the efficient operation of air conditioning systems. In practical applications, the cooling capacity of the internal mechanism should be calculated based on the room area, and the power of the external unit should be selected based on the total cooling capacity of the internal mechanism, ensuring that the excess ratio meets the standards to achieve the best cooling effect and economic benefits.


VRF-internal-units-installation

VRF-system-for-residential-area


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