Energy saving potential diagnosis for Moroccan university campuses

Public buildings are energy-intensive users, especially when energy management is lacking. More than ever, the use of energy efficiency strategies and renewable energy sources (RES) in buildings are a national priority for Morocco in order to improve energy self-sufficiency, replace fossil fuel use and lower energy bills and greenhouse gas emissions. Relating to the exemplarity of the Moroccan government in terms of energy efficiency and sustainable development, the study support that aim and presents results of a deep energy performance analysis of more than 20 university campuses across Morocco, which has concluded that around 80% of the energy consumed in the university campuses is designated for lightning and hot water for sanitary use. Later, this study examined the potential for energy saving and the environmental benefits of implementing actions to reduce energy demand from the grid, considering the use of on-site solar energy. Thereafter, the study aimed to analyze the impact of RES integration in public university campuses, namely the photovoltaic (ESM1) for electricity output and solar thermal system for hot water use (ESM2), to assess the techno-economic-environmental performance on building energy consumption reduction. Hence, the paper reported a detailed energetic-economic and environmental (3E) analysis simulation for campuses by integration of the two Energy Saving Measurements (ESM). The results showed that the integration of ESM1 system can reduce the annual energy demand by 22% and the energy bill by 34%, whereas the integration of ESM2 achieved 67% in energy saving. According to the analysis of the results, the integration of ESM1 is expected to save 6044 MWh of electrical energy annually on the 30222 MWh for all campuses and 2559 MWh for ESM2 which is equivalent to 284 m3/yr of diesel. With the reduced energy consumption, it is possible to cut down fossil fuels for electricity production and offset greenhouse gas emissions by 672 tons of carbon dioxide annually. Besides, the evaluation of results showed that the energy performance indicator was reduced from 530 kWh/bed /yr to 248 kWh/bed/yr, which represents 56% of energy saving

5.1 Energy Auditing

International audienceThis chapter presents the fundamentals of energy auditing as one of the most important approaches for reducing energy losses and minimizing the damaging effects of climate change and global warming. It classifies energy audits according to their type and level and describes their general methodology and tools. A case study of an energy audit carried out in the cement industry is presented as an illustrative example. \textcopyright 2018 Elsevier Inc. All rights reserved

Energy Conservation Potential of an Energy Audit within the Pulp and Paper Industry in Morocco

International audienceAn energy audit is a primary step toward improving energy efficiency at the facility level and ensuring a clean production. The pulp and paper sector is one of the most energy-intensive industries in Morocco. This article aimed at identifying energy conservation opportunities at a Small and Medium-sized paper industry. The audit results together with their financial viability are presented regarding the analysis of energy consumption and electrical quality issues. The paper introduces an action plan for a more efficient energy use of some specific applications such as furnaces and compressed-air installations as well. The recommended energy efficiency measures have the potential of saving about 347.85 MWh of electrical energy and 101.78 MWh of thermal energy corresponding to reductions of 11.48% and 2.22%, respectively. The total investments related to the application of the action plan is approximately 290.53 kMAD and the global payback period does not exceed one year. It was also shown that a total quantity of 283.39 t of CO2 emissions can be saved annually

Energy and environmental evaluation of alternative fuel vehicles in Maghreb countries

This study conducts a well-to-wheel assessment of alternative fuel vehicles in the Maghreb region, aiming to reduce greenhouse gas emissions from the transport sector. The research employs international standards, ISO 14040–14043, to assess diesel, hybrid-electric, battery-electric, and fuel-cell vehicles and highlights the potential benefits of transitioning to electric and fuel-cell vehicles in the Maghreb, offering energy efficiency and reduced environmental impact.The sensitivity analysis suggests that fuel-cell vehicles are the best alternative for Morocco and Algeria, while battery-electric vehicles are preferable in Tunisia. By 2030, fuel-cell vehicles in Morocco and Algeria would consume 128 ​MJ and 125 ​MJ and emit 7.9 CO2eq and 7.1 CO2eq emissions per 100 ​km, respectively, while in Tunisia, battery-electric vehicles are expected to consume 114 ​MJ and emit 6.55 CO2eq emissions per 100 ​km driven. Ultimately, the right adoption of alternative fuel vehicles in the Maghreb region implies half energy need cut off and 60% less GHG emissions from light-duty vehicles leading to improved environmental conditions, health outcomes, and economic growth

Renewable Power Generation: A Supply Chain Perspective

In recent years, the transition to a more sustainable and clean system has focused on the accelerated development of renewable energy technologies. This transition can be perceived as a major priority, especially with the current environmental concerns, threatening various aspects of human life. The objective of this article is, therefore, to highlight the role of the supply chain in the renewable power generation sector. In this context, a detailed assessment of the supply chain contribution to the renewable energy sector is presented. Next, the performance of the renewable energy supply chain is qualitatively evaluated by illustrating the various barriers against continuing development, and the key measures are recommended to overcome these barriers. Then, the main factors influencing the performance of the supply chain are identified and key performance indicators related to the renewable energy supply chain are established to achieve high efficiency and sustainability performances in the power sector

Energy storage: Applications and challenges

International audienceIn this paper, an updated review of the state of technology and installations of several energy storage technologies were presented, and their various characteristics were analyzed. The analyses included their storage properties, current state in the industry and feasibility for future installation. The paper includes also the main characteristics of energy storage technologies suitable for renewable energy systems

Post Energy Audit of Two Mosques as a Case Study of Intermittent Occupancy Buildings: Toward more Sustainable Mosques

Mosques are buildings with a unique occupancy schedule and special energy and water consumption scheme. Generally, this type of buildings lacks the application of energy efficiency solutions and sustainable guidelines during the conception, construction and the operation phase. Interestingly, these iconic edifices can play a key role in raising awareness for sustainability and promoting cleaner energy technologies. The first aim of this work is to present energy audit results, recommended energy savings solutions for two historical mosques in Marrakech (Morocco). A detailed discussion of the adopted solutions is presented and an economic assessment was performed. Then, a two-year energy savings evaluation was conducted for the two mosques. Conclusions about the adequacy of the proposed solutions is presented. The second part is dedicated to outline some guidelines and sustainable criteria to consider for establishing an international sustainable mosques label. The creation of a such sustainable label will encourage spreading sustainable best practices in mosques and other types of buildings. It will also help to compare sustainable performances of different mosques around the world by establishing an adapted sustainable rating system

A holistic digital workflow methodology to shifting towards net zero energy urban residential buildings in a semi-arid climate

Given the looming threats of climate change and the rapid worldwide urbanization, it is a necessity to prioritize the transition towards a carbon-free built environment. This research study provides a holistic digital methodology for parametric design of urban residential buildings with regard to the Mediterranean semi-arid climate zone of Morocco in the early design phase. The morphological parameters of the urban residential buildings, namely the buildings’ typology, the distance between buildings, the urban grid’s orientation, and the window-towall ratio, are evaluated in order to identify the key combinations of passive and active solar design strategies that determine the high energy performing configurations, based on the introduced Energy Performance Index (EPI), which is the ratio between solar BIPV production to maximum available installed BIPV capacity and the normalized thermal energy needs. Through an automated processing of 2187 iterations via Grasshopper, we simulate daylight autonomy, indoor thermal comfort and solar rooftop photovoltaic and building integrated photovoltaic (BIPV) energy potential. Then, we analyze the conflicting objectives of energy efficiency measures, active solar design strategies, and indoor visual comfort in the decision-making process that supports our goal of getting closer to net zero urban residential buildings. The digital workflow showed interesting trends in reaching a balanced equilibrium between performance metrics influenced by the contrasting impact of solar exposure on indoor daylight autonomy and thermal energy demand. Furthermore, the study’s findings indicate that it is possible to achieve an annual load match exceeding 66,56 % while simultaneously ensuring an acceptable visual indoor comfort (sDA higher than 0.4). The findings also highlight the important role of the BIPV system in shifting towards the net zero energy goal, by contributing up to 30 % of the overall solar energy output and covering up to 20 % of the yearly self-consumption. Moreover, the energy balance evaluation on an hourly basis indicates that BIPV system notably enhances the daily load cover factor by up to 5.5 %, particularly in the case of slab SN typology, throughout the different seasons. Graphical representations of the yearly, monthly and hourly load matches and the hourly energy balance of the best performing configurations provide a thorough understanding of the potential evolution of the urban energy system over time as a result of the gradual integration of active solar electricity production

Etude des déséquilibres entre phases dans un coulis de glace en écoulement dans un échangeur

International audienceIl s'agit d'un travail expérimental mené sur un banc d'essais hydrauliques où circule un mélange de glace et d'une solution d'éthanol. Les mesures simultanées des températures et des concentrations de la phase liquide, à l'entrée et à la sortie d'un échangeur, simulant le déstockage, ont révélé l'existence d'un déséquilibre thermodynamique entre les deux phases. L'importance de ce déséquilibre dépend essentiellement des débits et des puissances de chauffe utilisés. Les résultats montrent que plus la puissance augmente ou le débit diminue, plus le déséquilibre thermodynamique est important

Solar driven cooling systems: An updated review

International audienceThis paper presents a review of the available technologies to provide cooling from solar energy for boththermal and photovoltaic ways. Several multi-criteria performance indicators figuring in the literatureare presented followed by a pros and cons analysis of the different solar thermal cooling processes. Amarket study is also carried out to evidence the potential of these solar cooling technologies. Finally, anoverview of various solar cooling installations in Europe, Egypt and China is presented