Abstract
In this paper, an active domestic solar water heater is modeled under the climate conditions of five cities of Maghreb Arab Union countries by using Transient System Simulation Software Program. The aim is to evaluate the energy saving, payback period as an economic indicator, and the environmental benefit in reduction of greenhouse gases. Depending on the climate zone, it is found that the system has the potential to save annually between 3506-4130 kWh with a mean annual solar fraction between 71-100 % and has a payback period of 9.07-27.48 years. Another benefit of using the proposed system is the environmental issue; which results in reducing CO2 emission by an amount between 2-3.8 tCO2. These variations between can be attributed to the energy considerations in each country.
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