Abstract
In case of a Variable refrigerant flow(VRF) system, the refrigerant is supplied from one outdoor unit to a number of indoor units through manifold-shaped distributors. As the height difference between the distributors increases, the refrigerant may enter the distributor in two-phase state due to the pressure drop. Therefore, this study experimentally investigated the flow distribution characteristics in a distributor with four branches using air-water as a working fluid. Most of the literature deals only with the case where the working fluid is supplied from one inlet. However, for a VRF system depending on the mode of the indoor unit, the working fluid is supplied from both the inlet and branch. Therefore, the characteristics of two-phase flow distribution were investigated through three experimental cases considered in the flow arrangements varied by operation mode of the indoor unit. The experimental data of the two-phase flow distribution were obtained by varying void fraction, mass flow rate, and downstream flow resistance in the branch for each case. The unevenness of the distribution was suggested by the difference of liquid fraction where the liquid was most distributed and where it was least distributed.
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