Does the solar Collector integral collector storage have an electric resistance to heat the water during night.

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@Aaron Boranian, first I would like to thank you for the answer. Could you please tell me what is the difference between solar Collector Flat Plate Water & Solar Collector Integral Collector Storage? what is the best way to model a solar water heater with solar tubes provided with electrical resistance heater? please I need detailed instruction because I am beginner with openstudio modelling. Thank you in advance....

"Integral" means the storage of hot water is within the panels on the roof, and "Flat Plat" means the panels on the roof only collect heat and require a tank to store hot water. "Flat Plate" is more common and seems like what you want to use. Here is a post that explains in words what components to connect for the solar water heating system, and here is a post with diagrams of solar thermal loops in OpenStudio.

Also, it looks like you've made a duplicate or copy of this question as another post here. If possible, please keep all discussion related to a question in one post by updating the text of your question or adding comments. I will merge the other post with this one.

@Aaron Boranian, Thank you very much, What is the difference between Scheduled CHW Temp, Scheduled Deck Temp, & Scheduled HW Temp? Where to use them? In Solar Heater Plant Loop which one should be used? Sorry for lot of questions.

Those are the names of schedules created in the Schedules tab of the OpenStudio application. You would need to review the schedule values to see what temperatures they correspond to. If they don't match the hot water temperature that you want leaving the solar collectors, you can make a new schedule with the correct water temperature value. You would then apply this schedule to the setpoint manager at the final node of the supply side (top portion) of your solar heater plant loop diagram in the HVAC Systems tab of the OpenStudio application.

I would recommend reviewing the OpenStudio Quick Start Document for a thorough introduction to the application.

@Aaron Boranian, I have used in my model solar Collector Flat Plate Water, but I have noticed two illogical outputs: 1- the maximum loop temperature reached more than 120 degrees C while I have input that the max. loop temp. is 100 degrees C only, Why in your opinion?? Is there an option other than that I have used to control the water temp. of the solar loop ?

2-The electric power in the output (DView) appeared to be about 10300 BTU/hr which is about 3016 kW while I have entered 2400 W as the min. & Max heater capacity in the properties of the storage tank in the right column. Why? Thank you

It's really hard to say why these are happening without looking at your model. Could you add a link to your model for others to review?

Have you defined setpoint managers at the last supply side node of each loop (solar water and storage tank)? They are the green tag icons in HVAC diagrams from the solution of this post that I mentioned earlier.

@Aaron Boranian, Kindly find attached my Model Link: https://drive.google.com/file/d/10XFQ.... Please advice