Perancangan Sistem Pembangkit Listrik Hibrida (Energi Angin Dan Matahari) Menggunakan Hybrid Optimization Model For Electric Renewables (HOMER)

Telah dilakukan penelitian tentang sistem pembangkit listrik hibrida (energi angin dan matahari) menggunakan software HOMER. Penelitian ini bertujuan untuk merancang sistem pembangkit listrik hibrida (Energi angin dan matahari) menggunakan software HOMER. Pada penelitian ini diperoleh potensi radiasi matahari sebesar 8,073 kWh/m2 setiap hari dan potensi energi angin sebesar 2,3 m/s. Nilai NPC tertinggi sebesar $171.447 dan terendah sebesar$61,.811. Nilai COE tertinggi sebesar 1.,663 $/kWh dan terendah sebesar 0,599$/kWh.A research on hybrid power system (wind and solar energy) had been done. This study was aimed to design hybrid power system (wind and solar energy) by using HOMER software. The research resulted in potential solar radiation of 8.073 kWh/m2 per day and wind energy potential of 2.3 m/s. The highest NPC value was $171,447 and the lowest one was$ 61,811. The highest COE value was $1.663/kWh and the lowest one was 0.599$/kWh

Perancangan Sistem Pembangkit Listrik Hibrida (Energi Angin Dan Matahari) Menggunakan Hybrid Optimization Model for Electric Renewables (HOMER)

Telah dilakukan penelitian tentang sistem pembangkit listrik hibrida (energi angin dan matahari) menggunakan software HOMER. Penelitian ini bertujuan untuk merancang sistem pembangkit listrik hibrida (Energi angin dan matahari) menggunakan software HOMER. Pada penelitian ini diperoleh potensi radiasi matahari sebesar 8,073 kWh/m2 setiap hari dan potensi energi angin sebesar 2,3 m/s. Nilai NPC tertinggi sebesar $171.447 dan terendah sebesar$61,.811. Nilai COE tertinggi sebesar 1.,663 $/kWh dan terendah sebesar 0,599$/kWh.A research on hybrid power system (wind and solar energy) had been done. This study was aimed to design hybrid power system (wind and solar energy) by using HOMER software. The research resulted in potential solar radiation of 8.073 kWh/m2 per day and wind energy potential of 2.3 m/s. The highest NPC value was $171,447 and the lowest one was$ 61,811. The highest COE value was $1.663/kWh and the lowest one was 0.599$/kWh

Thermoelectric properties of Mexican-hat band structures

Materials with Mexican-hat electronic energy dispersions emerging from heterostructures, substrate effects, or spin–orbit couplings are believed to exhibit excellent thermoelectric properties due to its van Hove singularity of density of states in two-dimension. However, within a constant relaxation time approximation, we disprove this belief and we find that the singularity effect is cancelled down by the group velocity contribution in the thermoelectric transport distribution. Nevertheless, the band parameters can still be optimised to reach thermoelectric figure of merit larger than 2 in a wide bandwidth, thus keeping the potential of materials with Mexican-hat bands for thermoelectric applications

A Comparative Study of Thermoelectric Properties of Monolayer, Bilayer and Bulk CrI3

We comparatively study the electronic and thermoelectric properties of the monolayer, bilayer, and bulk CrI3 by density functional theory (DFT). We show that, according to the DFT calculation, those materials are magnetic semiconductors with ferromagnetic (FM) in monolayer, antiferromagnetic (AFM) in the bilayer, back to FM in the bulk structure. The thermoelectric properties of those materials are evaluated by using the Boltzmann transport equation (BTE) with a constant relaxation time approximation (RTA). At room temperature, we obtain bulk CrI3 has more significant electrical conductivity than monolayer and bilayer CrI3, while the Seebeck coefficient is similar that implied the bulk CrI3 has a better thermoelectric performance. In those systems, the optimum power factor is obtained by shifting the chemical potential of CrI3 by 1 eV with p-type doping

Long-lived qubit entanglement by surface plasmon polaritons in a Weyl semimetal

We investigate spontaneous entanglement of two qubits mediated by nonreciprocal surface plasmon polaritons (SPPs) in a Weyl semimetal. In the absence of external magnetic fields, the topology of the Weyl semimetal even gives rise to nonreciprocal SPPs that are topologically protected and reside inside the photonic gap. We utilize this nonreciprocal SPP as a mediator of entanglement of two spatially-separated qubits. Our two main findings are: (1) the nonreciprocal SPP gives better quantum entanglement than the reciprocal one, and (2) the achieved entanglement is sufficiently long-lived compared to the entanglement using SPPs in conventional metals.Comment: 24 pages in preprint format, 7 figure

Thermoelectric properties of semiconducting materials with parabolic and pudding-mold band structures

By a combination of semi-analytical Boltzmann transport and first-principles calculations, we systematically investigate thermoelectric properties of semiconducting (gapped) materials by varying the degrees of polynomials in their energy dispersion relations, in which either the valence or conduction energy dispersion depends on the wave vector raised to the power of two, four, and six. Within the relaxation time approximation, we consider various effects such as band gaps, dimensionalities, and dispersion powers to understand the conditions that can give the optimal thermoelectric efficiency or figure of merit (ZT). Our calculations show that the so-called pudding-mold band structure produces larger electrical and thermal conductivities than the parabolic band, but no significant difference is found in the Seebeck coefficients of the pudding-mold and parabolic bands. Tuning the band gap of the material to an optimum value simultaneously with breaking the band symmetry, the largest ZT is found in a combination of two-contrasting polynomial powers in the dispersion relations of valence and conduction bands. This band asymmetry also shifts the charge neutrality away from the undoped level and allows optimal ZT to be located at a smaller chemical potential. We expect this work to trigger high-throughput calculations for screening of potential thermoelectric materials combining various polynomial powers in the energy dispersion relations of semiconductors. We give preliminary screening results for bulk PtS2 and FeAs2 compared with Si, where we indicate that the former two have better thermoelectric performance than the latter