研究目的
The aim of this work was to calculate the efficiency of a solar heating system with vacuum tubes collector, and verify its economic viability using three distinct scenarios.
研究成果
The mean efficiency found for the model of solar heater in study was of 51%. The electric shower, when used in conjunction with the solar heater, consumes 6.5 times less electrical energy than when used alone. The return of investment in the installation of a solar heater connected to an electric shower, for an interest rate of 6% per year, occurs in about 7 years, when compared with using an electric shower alone.
研究不足
The high initial cost of this technology can be a negative factor. Moreover, the auxiliary heating for days with low solar radiation can use up a lot of energy, turning the system unviable.
1：Experimental Design and Method Selection:
The efficiency of a solar collector type all-glass installed in a rural area in Paraná, Brazil, in the winter period, was evaluated. Two daily showers were simulated in three different scenarios, to measure additional electrical consumption used to boost the heating of water.
2：Sample Selection and Data Sources:
The experiment took place during the period of 1st June to 31st August 2013, at State University of Western Paraná, situated in the city of Cascavel.
3：List of Experimental Equipment and Materials:
A vacuum tube solar water heater was connected to a boiler EXXA brand, with 1.6 x 2.6 m dimensions. It was installed facing north, with a 28° inclination. The collector is made up of 20 glass tubes, directly connected to thermal reservoir.
4：6 x 6 m dimensions. It was installed facing north, with a 28° inclination. The collector is made up of 20 glass tubes, directly connected to thermal reservoir.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The daily consumption of hot water during the entire period of the experiment was set to two showers occurring at the end of the afternoon, with temperature of water being around 40°C, and 60 L of volume per shower.
5：Data Analysis Methods:
The efficiency of the solar heating system was calculated from data gathered between 6:00 and 18:00 h each day.
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