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Students, professionals and people with interes in calculating Solar Thermal Water Heating Systems and its energy production in order to decide whether to invest or not in this technology.

* The geographical location of the facility. * The Monthly solar radiation on the horizontal plane. * The temperature of the water supply network. * The average daytime temperature. * Roof features: Deviation from South (if located in Northern Hemisphere) and Slope. * Type of collector’s integration on the building. * The profile of the obstacles that can cast shadows on the solar collectors. * The average hot water consumption at 60 ºC per end-user and day * The months scheduled for the STWH operation within one year * The hot water consumption profiles classified by Month, week and day * Type and prices of fuel consumption before and after STWH installation * Collector’s performance. * Parameters to place properly the solar collectors on the (sloped) roof * Features of the main equipments (exchangers , primary and secondary loops, solar storage tank, etc.) * Solar Fraction * Cost Ratios: Implementation, maintenance, monitoring, wardening insurance, etc.

* Solar collectors’ optimal position to maximize the received solar radiation during the operation period taking in account the slope and the orientation of the roof where the collectors are located. * Losses associated to orientation and tilt. * Solar chart according to the geographical location * Shadding losses due to overlaying the solar chart and the surrounding obstacles * Sizing of the main equipments (plate heat exchanger, primary and secondary loops, solar storage tank, etc.) to achieve the Solar Fraction. * Recalculating the annual Solar Fraction when features of the main equipments are modified * Energy production results: Annual and monthly Solar Fraction, Average annual efficiency, thermal energy demanded, solar energy contribution and excess of solar energy generated. * Profitability indicators according to static and dynamic calculation methods Besides, the profitability report, online issued in PDF format and editable format, shows: * Purpose and scope * Description of the STWH. * The annual and monthly radiation received on the solar collector according to his tilt and orientation. * Annual losses: shading, orientation and tilt * Monthly shading losses * Total weight in full load over the roof due to the solar collectors. * Total required area of (sloped) roof (including necessary gaps to avoid auto-shading) * Flow, pressure drop, and power of the hydraulic pumps in primary and secondary loops. * Percentage solution of antifreeze required in the primaryloop and its boiling and freezing point. * Compliance with regulations. * Performance charts. * Cash-flow curve according to income and expenditure for 25 years.

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