Energy Resources Consumption Minimization in Housing Construction

The article deals with the energy savings analysis during operation of buildings, provides the heat balance of residential premises, considers options for energy-efficient solutions for hot water supply systems in buildings. As technical facilities that allow the use of secondary heat sources and solar energy, there are also considered the systems with heat recovery of "gray" wastewater, heat pumps, solar collectors and photoelectric converters

Information and Ecological Behaviour towards the Natural Resources Consumption of the Population of Bucharest

Over the last decades, the consumer’s ecological behaviour has been the topic of intense debates, academic activities and researches. The scope of our article is to briefly highlight the importance of concrete actions aimed at informing and getting awareness of the environmental aspect in the consumption of natural resources, and also analyze the results of a research regarding the adult population perception of the methods developing ecological behaviour in consuming natural resources. A set of three hypotheses has been tested during the research using primary information obtained through a questionnairebased survey. The information has been processed using SPSS software. The results of our research outline the facts that the population of Bucharest is selective when choosing the information channels, that there is a low correlation between the civic expression and the individual behaviour due to an early development of the non-government organizations, the reduced civic involvement and the adverse accommodation of messages to target groups. Those who are interested in informing and developing the consumers’ ecological behaviour would rather need the support of fellow citizens than of the institutions authorized to promote such a message.ecological behaviour, consumer, natural resources, environment, information, Bucharest, concern

Architecture, design and source code comparison of ns-2 and ns-3 network simulators

Ns-2 and its successor ns-3 are discrete-event simulators. Ns- 3 is still under development, but offers some interesting characteristics for developers while ns-2 still has a big user base. This paper remarks current differences between both tools from developers point of view. Leaving performance and resources consumption aside, technical issues described in the present paper might help to choose one or another alternative depending of simulation and project management requirements.Ministerio de Educación y Ciencia TIN2006-15617-C03-03Junta de Andalucía P06-TIC-229

An Approach for Mitigating Disruptions on Resources’ Consumption Cycles

This paper examines the impact of disruptions on consumption cycles of resources. Such a cycle consists of states and transitions that depict how a resource is prepared, consumed, locked, unlocked, and withdrawn. It happens that events like last-minute upgrades and urgent fixes arise disrupting the resource’s ongoing consumption. Disruption leads to suspending an ongoing consumption to accommodate these events according to 3 scenarios referred to, in this paper, as co-existence, taking turns, and co-existence/taking turns. To verify the correctness of the resources’ consumption cycles with respect to each scenario, Petri Nets (PN) are developed linking this verification to properties like liveness and deadlock freeness

Green Hydrogen: Resources Consumption, Technological Maturity, and Regulatory Framework

Current climate crisis makes the need for reducing carbon emissions more than evident. For this reason, renewable energy sources are expected to play a fundamental role. However, these sources are not controllable, but depend on the weather conditions. Therefore, green hydrogen (hydrogen produced from water electrolysis using renewable energies) is emerging as the key energy carrier to solve this problem. Although different properties of hydrogen have been widely studied, some key aspects such as the water and energy footprint, as well as the technological development and the regulatory framework of green hydrogen in different parts of the world have not been analysed in depth. This work performs a data-driven analysis of these three pillars: water and energy footprint, technological maturity, and regulatory framework of green hydrogen technology. Results will allow the evaluation of green hydrogen deployment, both the current situation and expectations. Regarding the water footprint, this is lower than that of other fossil fuels and competitive with other types of hydrogen, while the energy footprint is higher than that of other fuels. Additionally, results show that technological and regulatory framework for hydrogen is not fully developed and there is a great inequality in green hydrogen legislation in different regions of the world.This research was funded by the Spanish Government, grant (1) Ref: PID2020-116616RBC31, and grant (2) Ref: RED2022-134588-T REDGENERA

Energy budgets' formation based on incomplete data

The universal technique of the current energy budget calculation is recommended for several periods of time. Basing on the data of annual energy budget and considering the plant's features, social, climatic and other conditions, correcting factors are calculated to estimate energy resources consumption for the day, week, month and year. Shortterm current energy budget supports important financial, trade, logistic, organizational and other control directions. The developed technique is applicable for subnational entities and industrial enterprises in order to increase level of energy resources consumption planning and forecasting as well as bills' optimization

Energy budgets' formation based on incomplete data

The universal technique of the current energy budget calculation is recommended for several periods of time. Basing on the data of annual energy budget and considering the plant's features, social, climatic and other conditions, correcting factors are calculated to estimate energy resources consumption for the day, week, month and year. Shortterm current energy budget supports important financial, trade, logistic, organizational and other control directions. The developed technique is applicable for subnational entities and industrial enterprises in order to increase level of energy resources consumption planning and forecasting as well as bills' optimization

Maximal near-field radiative heat transfer between two plates

A parametric study of Drude and Lorentz models performances in maximizing near-field radiative heat transfer between two semi-infinite planes separated by nanometric distances at room temperature is presented in this paper. Optimal parameters of these models that provide optical properties maximizing the radiative heat flux are reported and compared to real materials usually considered in similar studies, silicon carbide and heavily doped silicon in this case. Results are obtained by exact and approximate (in the extreme near-field regime and the electrostatic limit hypothesis) calculations. The two methods are compared in terms of accuracy and CPU resources consumption. Their differences are explained according to a mesoscopic description of near-field radiative heat transfer. Finally, the frequently assumed hypothesis which states a maximal radiative heat transfer when the two semi-infinite planes are of identical materials is numerically confirmed. Its subsequent practical constraints are then discussed.Comment: 19 pages, 11 figures, submitted to Journal of Physics D : Applied Physic