2016 Volume 33 Issue 2 Pages 155-164
Recently at commercial buildings and office buildings it is popular to install VRF (variable refrigerant flow) compression type heat pump system. Especially, VRF system which has multi indoor units is install in large building because this system has large adjusting capacity. On the other hand, depend on indoor unit’s condition the way to operation the other indoor unit change dramatically under unsteady-state driving, so it is too difficult to find optimum operating condition. In addition to changing the number of active indoor units occurs big change of quantity of refrigerant flow, refrigerant distribution changes step by step. We make the numerical simulation model which can be evaluate unsteady-state driving and make sure the accuracy of model, compared test results, and we analyze the effect of the case of decreasing active indoor unit.
