Which side of the plant loop for Solar Collector in E+/OpenStudio?

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In the model I am working on in OS the Collector is on the Plant's supply side and also in the in.idf after the forward translation the collector remains in the plant's supply side. if you need I can post pictures and code fragments.

Ok, After some testing and reading this is my take on that: The E+ measure I wrote to add AM to the collector loop didn't change much. Even when you run the E+ example file you will get freezing, and if you change weather file to hot weather you will get overheating.

Your observation about OS is correct, it won't let you add Collectors on the demand side as the E+ example is set. After doing some tweaking I found out that the collector performance curve is the most important. One have to make sure that coefficients are correct. After that said it is still reasonable to get some overheating since that is what happens in the real world. In order to prevent that, measure like pressure relief valve, drain - back or covering should be taken.

I am in the process of modeling an indirect solar water heating system...not finished yet but here is what I have learned. I added a new Empty Plant Loop and called it ServiceHWLoop, and then put a Water Use Connection on the Demand Side and a Water Heater Mixed on the Supply Side.

Then, I added a new Empty Plant Loop and called it SolarLoop. Next, I went to My Model (not Library) and dragged the Water Heater Mixed into the SolarLoop on the Demand Side. The Water Heater Mixed now shows four connection points - I interpret two of these to be the Source Side and the other two the Use Side consistent with the EnergyPlus nomenclature. I plan to put a pump and Solar Collector Flat Plate Water on the Supply Side of SolarLoop and then add controls, schedules, etc.

I will update in a day or so to indicate whether this works.