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

How to input the available electric heater power?

I am studying the total energy consumption of a small building after applying energy efficiency measures. One of the measures is installing a solar water heater for domestic hot water, instead of the standard electrical heater. How can I model in openstudio, a solar heater with solar tubes that is provided by electrical resistance heating that can be used at night or during some winter days. please I need the modeling instructions in details because I am beginner with openstudio modeling.

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No, it doesn't appear that there is an input for electric resistance heating for the SolarCollector:IntegralCollectorStorage object or its companion SolarCollectorPerformance:IntegralCollectorStorage object. If you wanted to account for electric resistance heating, you could add a water heater storage tank in parallel with the integral solar collector. This parallel water heater would provide electric resistance backup heating for the integral solar collector.

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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....

( 2020-08-30 18:20:03 -0500 )edit

"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.

( 2020-08-30 18:38:29 -0500 )edit

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.

( 2020-08-30 18:41:44 -0500 )edit

@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.

( 2020-08-31 07:19:13 -0500 )edit

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.

( 2020-08-31 10:39:44 -0500 )edit