University of Tabriz

About: University of Tabriz is a education organization based out in Tabriz, Iran. It is known for research contribution in the topics: Population & Nanocomposite. The organization has 12141 authors who have published 20976 publications receiving 313982 citations.

Short-Term Self-Scheduling of Virtual Energy Hub Plant Within Thermal Energy Market

Abstract: Multicarrier energy systems create new challenges as well as opportunities in future energy systems. One of these challenges is the interaction among multiple energy systems and energy hubs in different energy markets. By the advent of the local thermal energy market in many countries, energy hubs’ scheduling becomes more prominent. In this article, a new approach to energy hubs’ scheduling is offered, called virtual energy hub (VEH). The proposed concept of the energy hub, which is named as the VEH in this article, is referred to as an architecture based on the energy hub concept beside the proposed self-scheduling approach. The VEH is operated based on the different energy carriers and facilities as well as maximizes its revenue by participating in the various local energy markets. The proposed VEH optimizes its revenue from participating in the electrical and thermal energy markets and by examining both local markets. Participation of a player in the energy markets by using the integrated point of view can be reached to a higher benefit and optimal operation of the facilities in comparison with independent energy systems. In a competitive energy market, a VEH optimizes its self-scheduling problem in order to maximize its benefit considering uncertainties related to renewable resources. To handle the problem under uncertainty, a nonprobabilistic information gap method is implemented in this study. The proposed model enables the VEH to pursue two different strategies concerning uncertainties, namely risk-averse strategy and risk-seeker strategy. For effective participation of the renewable-based VEH plant in the local energy market, a compressed air energy storage unit is used as a solution for the volatility of the wind power generation. Finally, the proposed model is applied to a test case, and the numerical results validate the proposed approach.

Experimental Study on Thermal Efficiency of Flat Plate Solar Collector Using TiO2/Water Nanofluid

Abstract: In this study, a small flat plate solar collector (FPSC) was fabricated and tested for studying the effects of different nano particle concentrations of in water as base fluid. Three flow rates (i.e. 36, 72 and 108 lit/m2.hr) and four particles concentration ratios (i.e. 0, 0.1, 0.2 and 0.3 % wt) were investigated. Experimental testing method was selected based on EUROPEAN STANDARD EN 12975-2 as a quasi-dynamic test method (QDT). Adding nano particles to water brought about an improvement of initial efficiency of FPSC between 3.5 and 10.5% and the index of collector total efficiency between 2.6 and 7% relative to base fluid. Also the results indicate that the initial efficiency () for 36, 72 and 108 lit/m2.hr flow rates of water as base fluid were 0.4712, 0.4998 and 0.5457, respectively which reveals the increase of 6.1 and 15.8% of it in the two latter cases in comparison with the first case, 36 lit/m2.hr flow rate. In addition, the index of collector total efficiency of 72 and 108 lit/m2.hr mass flow rates has increased by 6.7 and 15.7%, respectively in comparison with 36 lit/ m2.hr mass flow rate.