“…The use of forced circulation (T3) provided a higher temperature gain and a 56% increase in the amount of thermal energy stored (Table 5) when compared to natural circulation (T4). Jordan et al (2015) and Pandey et al (2015) have shown that increasing the flow up to a certain value, contributes to the increase of solar collector efficiency. The electric power consumption of the configuration operating with forced circulation heat pump (T1) was 54.9% lower than the configuration using the 3000 W of electrical resistance as supplementary heating (T2).…”
A comparative test of water heating between the hybrid system-solar collector with heat pump-and a system with conventional supplementary heating-with high electric powerwas performed. For this, a small capacity heat pump was installed, which was later installed together with a solar heating system, composed of a 250 L thermal reservoir and three thermoplastic collector plates. Tests were carried out to evaluate the COP of the heat pump and the energy consumption of the solar heating system operating with the heat pump and with an electrical resistance of 3000 W. In the laboratory tests, the heat pump presented an average COP of 2.15. In the field tests, the energy consumption of the solar system with heat pump was 54.9% lower when compared to the tests in which electrical resistance was used as a source of supplementary heating.
“…The use of forced circulation (T3) provided a higher temperature gain and a 56% increase in the amount of thermal energy stored (Table 5) when compared to natural circulation (T4). Jordan et al (2015) and Pandey et al (2015) have shown that increasing the flow up to a certain value, contributes to the increase of solar collector efficiency. The electric power consumption of the configuration operating with forced circulation heat pump (T1) was 54.9% lower than the configuration using the 3000 W of electrical resistance as supplementary heating (T2).…”
A comparative test of water heating between the hybrid system-solar collector with heat pump-and a system with conventional supplementary heating-with high electric powerwas performed. For this, a small capacity heat pump was installed, which was later installed together with a solar heating system, composed of a 250 L thermal reservoir and three thermoplastic collector plates. Tests were carried out to evaluate the COP of the heat pump and the energy consumption of the solar heating system operating with the heat pump and with an electrical resistance of 3000 W. In the laboratory tests, the heat pump presented an average COP of 2.15. In the field tests, the energy consumption of the solar system with heat pump was 54.9% lower when compared to the tests in which electrical resistance was used as a source of supplementary heating.
Foram realizados testes em ambiente aberto com dois painéis fotovoltaicos, na cidade de Dourados/MS, durante seis dias não consecutivos, entre os meses de junho a julho de 2018, onde um painel foi mantido original (PV), enquanto o outro sofreu modificações para operar como um módulo fotovoltaico-térmico utilizando água (PVT/w), sendo este conectado a um reservatório para acumulação de água quente. Nos ensaios foram feitas medições de tensão de circuito aberto (Voc), temperatura na superfície das células fotovoltaicas e temperatura da água do sistema de resfriamento e termoacumulação do PVT/w, para determinação da energia térmica produzida e estimativa do rendimento térmico. O aumento da temperatura da água de arrefecimento afeta de forma negativa o valor da tensão de circuito aberto, a qual foi, em média, 2,3% maior para o PVT/w, o qual apresentou menor temperatura superficial em todos os testes. O rendimento térmico médio do PVT/w foi de 242 W m-2, resultando numa estimativa de rendimento total (térmico e elétrico) de 349 W m-2, um aumento de 161% em relação ao rendimento energético do PV (apenas energia elétrica), estimada em 106 W m-2 com base nas informações do catálogo técnico do fabricante.
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