This design model is about Evacuated Tube Solar Collector (ETC-Water working fluid) for the heating load. The system design is attached to an intermediate heat exchanger storage tank. The system is used to generate thermal heat based on the user load. 
Users will be able to discover the total area based on the assigned thermal load volume. The following parameters can be calculated:
1-Mean plate temperature.
2-ETC total area.
3-Overall losses.
5-Exergy analysis.
6-System total thermal power.
7-Total system area, design operating conditions, and flow rates.
8-Storage tank design and size.
9-Cost analysis.

The system main units are:
2-Heat exchanger storage tank.
4-Pumping system.
6-Water working fluid.


**MatLab-SimuLink should be used to run the model.