| 1. |
- Liu, Suhong, et al.
(författare)
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Energy analysis using carbon and metallic oxides-based nanomaterials inside a solar collector
- 2020
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Ingår i: Energy Reports. - Germany : Elsevier. - 2352-4847. ; 6, s. 1373-1381
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Tidskriftsartikel (refereegranskat)abstract
- The effectiveness of a flat-plate solar collector was studied by using SiO2, Al2O3, Graphene, and graphene nanoplatelets nanofluids with distilled water as the working fluids. The energy efficiency was theoretically compared using MATLAB programming. The prepared carbon and metallic oxides nanomaterials were structurally and morphologically characterized via field emission scanning electron microscope. The study was conducted under different operating conditions such as different volume fractions (0.25%, 0.5%, 0.75% and 1%), fluid mass flow rate (0.0085, 0.017, and 0.0255 kg/s), input temperatures (30, 40, and 50 °C), and solar irradiance (500, 750, and 1000 W/m2). Nanofluids showed better thermophysical properties compared to standard working fluids. With the addition of the nanofluids SiO2, Al2O3, Gr and GNPs to the FPSC the highest efficiency of 64.45%, 67.03%, 72.45%, and 76.56% respectively was reached. The results suggested that nanofluids made from carbon nanostructures and metallic oxides can be used in solar collectors to increase the parameters of heat absorbed/loss compared to water only usage.
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| 2. |
- Palm, Jenny, et al.
(författare)
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Understanding tenants’ responses to energy efficiency renovations in public housing in Sweden : From the resigned to the demanding
- 2020
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Ingår i: Energy Reports. - : Elsevier BV. - 2352-4847. ; 6, s. 2619-2626
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Tidskriftsartikel (refereegranskat)abstract
- This study focuses on the experiences of tenants in renovation projects of public housing rental apartments in Sweden. Tenants’ perspectives are under-researched in the context of energy efficiency renovation projects, which is a considerable oversight given the many ways in which such projects impact their lives. The aim of the paper is to reveal rare qualitative insights into tenants’ experiences of, and attitudes towards, energy efficiency renovations in a public housing context and the extent to which they feel motivated and able to influence the renovation project. Participatory observations at tenant meetings were conducted as well as semi-structured phone interviews. An empirically driven typology is developed indicating that tenants have different interests and attitudes regarding energy efficiency renovations. Six different types are identified: the satisfied; the demanding, the conservative, the resigned, the sceptical and the resistant.
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| 3. |
- Zhu, Ruijin, et al.
(författare)
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Short-term prediction for wind power based on temporal convolutional network
- 2020
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Ingår i: Energy Reports. - : Elsevier BV. - 2352-4847. ; 6, s. 424-429
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Tidskriftsartikel (refereegranskat)abstract
- The fluctuation and intermittence of wind power bring great challenges to the operation and control of the distribution network. Accurate short-term prediction for wind power is helpful to avoid the risk caused by the uncertainties of wind powers. To improve the accuracy of short-term prediction for wind power, the temporal convolutional network (TCN) is proposed in this paper. The proposed method solves the problem of long-term dependencies and performance degradation of deep convolutional model in sequence prediction by dilated causal convolutions and residual connections. The simulation results show that the training process of TCN is very stable and it has strong generalization ability. Furthermore, TCN shows higher forecasting accuracy than existing predictors such as the support vector machine, multi-layer perceptron, long short-term memory network, and gated recurrent unit network.
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