.Greenhouses.Flows.HeatTransfer.PipeFreeConvection_N .Greenhouses.Flows.HeatTransfer.PipeFreeConvection_NThis model is a variant of the PipeFreeConvection model, in which one single-port is replaced by a multi-port, thus enabling the computation of the heat flow when using discretized pipes models. The total heat flow to the air (i.e. heat flow at the single heat port) is defined as the sum of the heat flow from each cell.