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Publications
Publications (61)
The freezing process as a charging condition in a shell-and-coil ice storage system, as a cold energy battery, is examined in this work through mainly numerical simulations. The numerical model is first carefully validated against new experimental measurements using an ice-on-coil storage system developed for that purpose. Next, a numerical sensiti...
The primary sources of irreversibility in a polymer electrolyte membrane fuel cell are identified using the entropy generation approach. In the current work, a 2D multicomponent lattice Boltzmann method (LBM), which simulates chemical and electrochemical interactions in addition to heat and mass transfer, is used to compute the entropy generation r...
Metal hydrides' great density, safety, and controlled release at low pressures make them indispensable for storing hydrogen. Both large-scale and portable applications can benefit from their continuous rechargeability. For a hydrogen economy to be sustainable, research into increasing their efficiency is essential. In this work, a two-dimensional m...
One of the key issues confronting modern greenhouses is the need to supply the necessary energy in an environmentally friendly manner to facilitate heating and cooling processes within greenhouses. Solar radiation entering the greenhouse during the day can sometimes be more than the energy demand of the greenhouse. In contrast, there are cases wher...
Rock beds, considered as one of the suitable options for a sensible heat storage system, have recently been employed and analyzed by researchers. The main advantages of this system include the abundance of material (rock) used in the bed to store thermal energy and its low cost. The system utilizes the material for a specific purpose by passing thr...
Performance of available air-source heat pumps (ASHP) for buildings is extremely influenced by the outdoor air temperature (OAT). When OAT falls below –20°C, especially in subarctic climate, most commercially available ASHPs lose their defined functionality. To address this issue, a novel cascade heat pump (CHP) is proposed that utilizes two natura...
Governments are prioritizing energy efficiency and decarbonization to reach the objectives fixed by international agreements towards net-zero emissions. Integrated systems coupling renewable energy (solar, wind) with medium to high-temperature thermal energy storage (TES) appear as an interesting solution in the energetic mix, especially for large...
Decarbonizing industrial heating globally is a significant challenge, driving the integration of high-temperature heat pumps for heat recovery and electrification in the industrial sector. However, current high-temperature heat pumps with low global warming potential refrigerants face limitations in delivering high-temperature heat due to their res...
Due to its unique qualities and advantages, phase change materials (PCMs) are crucial for thermal energy storage in various applications. The poor conductivity of PCMs is known to cause delayed charging and discharging rates. So, various techniques were proposed by the researchers to improve the thermal performance of PCM systems. To address this c...
The building sector is one of the main players in the global energy market. Passive strategies such as natural ventilation are promising techniques toward sustainable targets in this sector. Windcatchers as a natural ventilation system can provide fresh air and improve thermal comfort. However, the performance evaluation of windcatchers is still a...
Among several kinds of heat exchangers, borehole (ground) heat exchangers have a prominent place in application of renewable energy systems to supply energy. Recently, there has been noteworthy improvement in new methods of modeling and analyzing such systems. This development is the outcome of several empirical and theoretical researches in the th...
Thermal energy is one of the most widely encountered energy forms in our daily life. To ensure efficient utilization and conversion of this energy, the balance between supply and demand needs to be maintained. For this purpose, thermal energy storage is required. There are various thermal energy storage systems available; one of the most basic is s...
This study presents a computationally efficient numerical model for solving the fluid flow and heat transfer phenomena in co-axial boreholes heat exchangers arranged on a rectangular grid (N × N) drill hole pattern. Such systems of boreholes are an integral component of a Solar-Borehole Thermal Energy Storage System for seasonal thermal storage app...
Rapid economic growth has led to energy resources shortages, creating unique challenges for developing countries whose activities depend on energy. Thermal energy storage is an important field of technology that can be deployed as a reliable method to decrease net energy usage. For example, ice storage systems are one of the most efficient methods...
Using mine ventilation network (MVN) software to model airflow through porous zones in underground mining operations is arduous due to its complex and dynamic nature. However, accurately measuring airflow is essential to control underground mine air quantity and quality. This study integrated the computationally expensive conjugate porous media mod...
The extensive use of fossil fuels for space and water heating in buildings is raising CO2 emissions into the atmosphere. To address this concern, renewable and alternative energy sources should replace conventional energy sources. This paper examines the technical feasibility, economic viability, and environmental impact of substituting conventiona...
In cold climates, a borehole thermal storage system is key to supplying renewable energy year-round for heating applications. For such systems, coaxial borehole heat exchangers are getting more attention in recent years due to their superiority over other types of borehole heat exchangers. As such, more research is needed to understand the heat tra...
Buildings account for almost 40 percent of worldwide energy usage. In Canadian residential buildings, energy consumption is dominated by space heating and domestic hot water supply. Thus, focusing on this sector is essential in the effort to reduce the environmental and economic costs of energy usage. In this study, a municipal sewage heat recovery...
Understanding the behavior, characteristic and interaction of airflow and air/gases leakage through broken rock zones, tunnels and underground mine openings is still a challenging research area due to the complex flow structure through the dynamic nature of underground mine environment. It is crucial to accurately calculate the ventilation paramete...
Modern data centers are playing a pivotal role in the global economic situation. Unlike high-quality source of waste heat, it is challenging to recover the decentralized and low-quality waste heat sourced from data centers due to numerous technological and economic hurdles. As such, it is of the utmost importance to explore possible pathways to max...
Due to their relatively high thermal effectiveness and ease‐of‐use, direct contact heat exchange units are a favorable choice in heat recovery applications. Today, spray‐based direct heat exchangers are commonly used for a variety of applications, including evaporative cooling and heat recovery. Yet in spite of their versatility, these heat exchang...
This study seeks to investigate the concept of using large waste rocks from mining operations as waste-heat thermal energy storage for remote arctic communities, both commercial and residential. It holds its novelty in analyzing such systems with an experimentally validated transient three-dimensional computational fluid dynamics and heat transfer...
Thermochemical biomass conversion technologies use renewable feedstocks to produce gaseous, liquid and solid fuels to produce electric power, heat, chemicals or other types of fuel. Biomass gasification has emerged as a promising conversion technology to meet increasing global energy demands. In this study, a thermodynamic model programmed with MAT...
The Atkinson equation along with its friction factor is commonly used to estimate pressure requirement in mine ventilation. However, friction factor correlation of flow through broken rock, typically found in blasted stope, gob, rock pit or block caving rock deposits, etc., is currently unavailable. Also, it is impractical to conduct direct measure...
Dependency on fossil fuel and associated carbon footprints have increased the urge to look for methods to increase the thermal efficiency of heating and cooling systems. Exhaust air heat recovery system is one of the promising solutions with viable potential in industrial applications such as mine ventilation and so on. Direct contact heat exchange...
Characterization of flow through packed bed of spheres with large particle diameters (O ~ m) is important in industrial applications, such as mining, geothermal, oil and gas, and construction industries. In this study, a three-dimensional pore-scale mathematical model of packed bed of spheres with large particle diameters considering uniform and no...
Remote communities in arctic climates are solely dependent on diesel generators for continuous power supply due to their detached loci from national power gridlines or natural gas pipelines. Moreover, to get along with the harsh, long winters, these communities directly or indirectly depend on fossil-fuel based heating systems. Due to the lower eff...
Thermal energy storage in packed rock beds helps to reduce energy costs and carbon footprint’s on an industrial, commercial and residential scale. Fluid flow and heat transfer in large-size packed rock beds used in mining applications such as heating/cooling of mine intake air or ventilation of block-caved mines have recently received significant a...
Communities situated in distant areas are deemed as 'remote' and have either very limited or no access to power grid lines. Therefore, most of these communities greatly depend on diesel-burning for power and heat provision at all times. Nonetheless, nearly 30% of the energy associated with the diesel burning and power generation process is dissipat...
Increasing depth and complexity of recently discovered orebodies are forcing mining companies to deploy highly energy-intensive and technologically challenged mining projects. These challenges usually result in higher energy demands along with heavier draw on infrastructure, power and capital/operating costs. If not tackled innovatively, these chal...
Underground mining is among the most energy-intensive industries and ventilation comprises a significant portion of the energy demands of this important industry. Using the vast volume of broken rock, left in a decommissioned mine pit, as a thermal energy storage mass has enormous potential to lower ventilation-related energy costs in deep undergro...
The objective of this study is to perform the energy and exergy analysis of an integrated ground source heat pump (GSHP) system, along with technical assessment, for geothermal energy production by deployment of Engineering Equation Solver (EES). The system comprises heat pump cycle and ground heat exchanger for extracting geothermal energy from un...
Ventilation is one of the most energy demanding parts of deep underground mining operations due to the extensive amounts of energy needed to cool (or heat) the substantial amount of air flow in underground workings. This considerable amount of energy demand can be partially satisfied by extracting renewable energies or using alternative energy solu...
Ventilation plays an important role in energy demands of mining industry. Using the immense volume of waste rock as thermal energy storage mass to shave seasonal air temperature oscillations is a genuine and practical solution to save on ventilation energy demands. The extensive size and considerable temperature gradients exhibited in such systems...
The influence of anaerobic co-digestion of leachate and sludge with Organic Fraction of Municipal Solid Waste (OFMSW) under mesophilic condition in three batch digesters of 5 L capacity has been studied. OFMSW was mixed with leachate and sludge at three different ratios. Experimental results illustrated that the digester with a ratio of 2000/2500 (...
Backfill process has become standard practice in mining industry where the backfill slurry is transported from surface to underground via pipeline system. Paste backfill is one of the types of backfill slurries which in recent years has gained popularity due to its reduced water content, fast solidification time and it's environmentally friendly re...
Ventilation plays an important role in energy demands of mining industry. Using the immense volume of waste rock as thermal energy storage mass to shave seasonal air temperature oscillations is a genuine and practical solution to save on ventilation energy demands. The extensive size and considerable temperature gradients exhibited in such systems...
Deep underground mining is highly energy intensive due to the need of considerable amount of energy for heating, cooling and ventilation purposes. While this high energy demand cannot be diminished, it could be partially satisfied by taking advantage of the renewable energies available at mine site.
This paper studies the possibility of using immen...
Abundant mine waters of underground mines offer considerable amounts of geothermal heat that can replace fossil fuels at mine sites. The few existing mine geothermal projects use the waters accumulated in the underground galleries of abandoned mines. However, the authors believe that actives mines are much more suitable to host geothermal systems f...
Deep underground mining is highly energy intensive due to the need to overcome high pressure rise required by ventilation fans, high cooling load in summer due to rise in rock temperature and the auto-compression effect, and heating requirement in winter. Rising energy costs have led the mining industry to look for alternatives in energy-efficient...
Deep underground mining is highly energy intensive due to the need to overcome high pressure rise required by ventilation fans, high cooling load in summer due to rise in rock temperature and the auto-compression effect, and heating requirement in winter. Rising energy costs have led the mining industry to look for alternatives in energy-efficient...
Anaerobic digestion (AD) has been recently introduced as a promising technology for producing bioenergy around the world. Due to its especial characteristics, solid waste could be considered as a proper feedstock in the digester. Retention time (RT) and rate of biogas production are two major parameters affecting the efficiency of the process. The...
Anaerobic digestion (AD) treatment of agricultural and animal waste can be considered as a means of enabling environmental remediation. This research investigated two conditions of anaerobic co‐digestion of maize waste and cow dung. This was done by placing a mixture of cow dung and maize waste together in a floating drum digester that was run at t...
Polycyclic aromatic hydrocarbons (PAHs) are potential carcinogenic and hazardous compounds having raised appreciable environmental concerns around the world in recent decades. This research investigates the effect of soil washing on removal of PAHs in contaminated soil. The study was conducted by collecting soil samples from a petrochemical complex...
This research compares the various waste management strategies in Tabriz, Iran, and selects the best one by a decision-making method. Selection the best strategy is conducted based on the Multi Criteria Analysis (MCA). In this regard, the Analytic Hierarchy Process (AHP), a mathematical technique for multicriteria decision making, and the Multi Cri...
Anaerobic digestion technique is an environmentally friendly biological process considered as an alternative for improving the endangered environment condition caused by wastes like degradable and animal wastes. Anaerobic digestion has a broad range of applications which are symmetrically different from each other. Although the obvious aspect of th...
As a consequence to the increasing number of population and the improvement of living quality, the total amount of municipal solid waste is continuously rising. Developing alternative energy source to replace traditional fossil fuel has recently become more and more attractive due to the high energy demand, the limited resource of fossil fuel, and...
In this research, the effect of using vermicompost on growth rate, fertility and characteristics of tomatoes has been studied. Four vermicompost:soil mixture were supplied with ratios of 1:1, 1:2, 1:3, and 1:4 and also four different beds were provided. Total of 24 small globe tomato plants were tested and in each bed combination, six tomato plants...
http://rpsonline.com.sg/proceedings/9789810857165/978-981-08-5716-5_T298.xml