j-zipplies

**Describe the bug** This applies to the open loop demand models with a fixed return temperature: AixLib.Fluid.DistrictHeatingCooling.Demands.OpenLoop.VarTSupplyDp AixLib.Fluid.DistrictHeatingCooling.Demands.OpenLoop.VarTSupplyDpBypass From the documentation and parameters of the model, the user will expect...

**Describe the bug** The model AixLib.Fluid.DistrictHeatingCooling.Demands.OpenLoop.VarTSupplyDpBypass seems to have an implementation of return temperature that is not robust: Whenever the bypass is active (= when the calculated mass flow is...

**Describe the bug** Within AixLib.Fluid.DistrictHeatingCooling.Demands.OpenLoop.VarTSupplyDpBypass the connector source.m_flow_in is connected to changeSing.y (the negative mass flow signal = inflow) instead of smoothMax.y (which would be the correct outflow from the...

Hydraulics of hot water in pipe: Unexpected effects of temperatures on pressure drop

7

**Describe the bug** When simulating hot water in a pipe via pp.pipeflow(net, mode="all"), the results for velocity and re-Number => lambda and in final consequence the pressure drop have unexpected...