Sharifah Rafidah Wan Alwi

Sharifah Rafidah Wan Alwi
Universiti Teknologi Malaysia | UTM · Faculty of Chemical and Energy Engineering (FCEE)

PhD (Chemical Engineering), BEng (Chemical)

About

185
Publications
156,097
Reads
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4,524
Citations
Citations since 2017
29 Research Items
2933 Citations
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Introduction
Sharifah is the Director of Process Systems Engineering Centre (PROSPECT) of Universiti Teknologi Malaysia (UTM). Sharifah has been extensively involved in 28 research projects, 17 industrial based projects for various companies and government agencies and has trained engineers from more than 100 companies in the field of energy and water minimisation. She specialises in process systems engineering with emphasis on resource conservation
Additional affiliations
June 2004 - present
Universiti Teknologi Malaysia
Position
  • Managing Director
Description
  • Reasearch are: Process systems engineering with emphasis on resource conservation.
April 2004 - December 2015
Universiti Teknologi Malaysia
Position
  • Director of Process Systems Engineering Centre (PROSPECT)
Education
June 2004 - March 2007
Universiti Teknologi Malaysia
Field of study
  • Chemical Engineering
September 2000 - August 2003
The University of Manchester
Field of study
  • Chemical Engineering

Publications

Publications (185)
Article
Removing anthropogenic carbon dioxide emissions from existing industrial sites is essential to slow down climate change. A multipronged approach is required to reduce the carbon dioxide footprint of an existing industrial site by including carbon dioxide capture and utilisation, industrial symbiosis, heat integration and the introduction of renewab...
Article
Full-text available
Cogeneration or combined heat and power (CHP) energy system could concurrently produce electrical and heat energies. Nonetheless, its integration in energy planning would need to consider interactions with other energy carriers, energy storages, and transmission networks. Previous works have used energy hub (EH) modelling to optimise the energy flo...
Article
This work aims to extend the Pinch-based approach, namely the Material Recovery Pinch Diagram to identify the minimum numbers of water mains/headers required, flowrates and concentrations of the contaminants inside the water mains/headers. The freshwater target should be first determined using the Source and Sink Composite Curves (CC) representatio...
Article
This study aims to assess the environmental footprint of the increasing share of renewable energy and global energy demand. The considered footprints, including GHG emission, NO x emission, SO 2 emission and water consumption, are expressed in eco-cost. The assessment indicated that the eco-cost of global energy consumption increased, comparing 200...
Article
The emergence of global warming phenomena that has adversely affected the world today has been largely attributed to the proliferation of greenhouse gases, with Carbon dioxide, as its main constituent. The challenge to reduce the Carbon dioxide footprint can be overcome by increasing the value of Carbon dioxide emissions by creating subsidiary indu...
Article
Since the early 90’s, Composite Curves (CC) and the Grid Diagram (GD) have been among the most popular graphical tools for targeting and design of Mass Exchange Networks (MEN) based on Pinch Analysis technique. However, CC has limitations since it maps rich and lean streams based on composites instead of individual streams on the composition versus...
Article
Process effluent recovery can be a potential source of revenue and an effective way to reduce environmental footprints of industrial processes. Use of resource conservation technologies, resource-efficient processes and measures to reduce, recycle and reuse of various raw materials and waste are among sustainable manufacturing and cleaner productio...
Article
Diesel power systems have been widely applied for energy supply generation. This power scheme however requires periodical maintenance and contributes to the emissions of greenhouse gases. These challenges may be mitigated by integrating existing diesel station with renewable energy (RE) technologies into a hybrid system. Integration of diesel plant...
Article
Design of cost-effective Mass Exchange Networks (MENs) that involves mass integration can help to minimize the amount of mass separating agent (MSA) purchased, waste MSA generated by industries, reduce operating costs and mitigate environmental issues associated with MSA disposal. Design of MENs can be done using graphical and numerical methods, as...
Article
Total Site (TS) analysis for incorporating short-term or daily energy variation has been introduced in the previous studies as an extension of the Time Slice Model for the Heat Integration of batch processes. However, the energy supply and demand fluctuation could also be affected by changing customer demands due to seasonal climate variations, eco...
Article
The difference in electricity pricing based on the time of power use has led to load shifting from peak to off-peak hours in hybrid power systems (HPS). Apart from optimising electricity cost, shifting of the load may also change the capacity of storage in the system. Power Pinch Analysis has been recently applied to guide load shifting aiming to m...
Article
Medium and large scale industries typically consume large amounts of energy, and are under pressure to increase energy efficiency and reduce energy wastages. Conventional insight-based heat exchanger network (HEN) retrofit methods typically combine graphical visualisation and algebraic tools to manage different retrofit stages. These stages often i...
Article
Water is widely used in industry for processes such as washing, stripping, extraction, heating and cooling. Water minimisation has become an urgent need in the industry due to the scarcity of quality water, stricter environmental regulations, rising price of freshwater as well as the cost of wastewater treatment. In some countries and regions, wate...
Article
Full-text available
Rising energy prices, as well as environmental pollution and depletion of fossil fuel, have increased the need to find alternative energy sources and improve the efficiency of current energy systems. Conventional power plants only use an average thermal efficiency of 30-35 % to produce power while the remaining energy is dissipated to the environme...
Chapter
Tools for modeling the optimal supply planning and efficient demand management of hybrid power systems (HPS) have been well established. However, complementary insight-based tools that can offer energy planners, decision-makers, energy managers, and electrical and power engineers with visualization insights that are essential for better understandi...
Article
Full-text available
Most of the extraction processes of herbal phytochemicals use solvent mixtures as phytochemical transfer medium. It is very important to predict the stability of solvent mixtures before it is used to extract herbal phytochemicals. In order to prevent any disturbance in the herbal extraction, the solvent mixtures must be in a single-liquid phase (mi...
Article
Carbon dioxide emissions coming from industrial, transport, service and business activities as well as methane and nitrogen oxides from agriculture are major greenhouse gases with high global warming potentials. Modelling tools for the optimal management and reduction of greenhouse gas emissions, in particular, carbon dioxide, have received growing...
Article
Development of Power Pinch Analysis (PoPA) for the design and optimisation of Hybrid Power Systems (HPS) is steadily progressing. Even though PoPA has been developed for a wide range of applications in HPS design and analysis, the economic aspect still needs more attention. Screening of various renewable energy (RE) technologies in HPS is crucial a...
Article
A Wastewater Treatment Plant consists of multiple equipment and processes to treat wastewater. The wastewater treatment process consumes resources and releases emissions that could potentially harm the environment. Due to the growing concern on the environmental impact of Wastewater Treatment Plants, much research has been done to assess its perfor...
Article
Full-text available
Heat exchanger network synthesis (HENS) is an important part in the overall chemical process. HENS links the process flowsheet with the utility system and generally involves a large fraction of both the overall plant capital cost, operating costs in terms of energy requirements, which is a key factor for a profitable process. The aims of the synthe...
Article
Full-text available
Heat exchanger network (HEN) is very important to optimise energy usage in process industry. Heat exchanger network synthesis is an important process synthesis problem where different tools and methods have been presented to solve this synthesis problem. In HEN synthesis, the feasibility of the HEN design is not taken into consideration. The HEN de...
Article
Full-text available
The problem of interaction between economic design and controller design of heat exchanger network (HEN) is addressed in this work. The feasibility and sensitivity issues are incorporated in the classical design of HEN. HENs in industry seem to be very efficiently operated. The network that may have operated efficiently perhaps is the one that is n...
Article
Full-text available
Concerns over sustainability of fossil fuels, and increasing awareness for the environment have encouraged countries all over the world to shift from the heavy reliance on fossil fuel to renewable energy (RE) resources for electricity generation. Although implementation of RE has been on the rise, large-scale deployment of RE still remains a challe...
Article
This paper presents a mathematical model to determine the minimum energy targets for a batch process with flexible schedule. Techniques developed for flexible-schedule batch processes typically result in nonlinear formulations. The proposed model was formulated as a mixed integer linear programming model (MILP). The model is developed based on the...
Article
Full-text available
Determination of toxic lead ions at trace level using solid-based adsorbents has become of interest in recent years. In this work, a novel bio-adsorbent originating from papaya peel waste (PPw) and magnetic nanoparticles (Fe3O4) was developed (Fe3O4/PPw). The new adsorbent was prepared using a one-pot green method and characterized by Fourier trans...
Article
Full-text available
There are many diseases related to the excessive amount of free radical in human body produced by various metabolic functions. The generation of free radicals can be controlled by the presence of antioxidants. One of the largest phytochemical groups in herbs which commonly exhibit antioxidant activity is flavonoid. The structure of flavonoid compou...
Article
Full-text available
Pinch analysis concept has been recently stepped into the realm of design and optimisation of power systems. One well-established pinch analysis that has been used in power systems design and optimisation is called Power Pinch Analysis (PoPA). In PoPA, both graphical and numerical approaches have provided an insight on the systematic approach to ta...
Article
Full-text available
Research on the optimal design of heat exchanger networks (HENs) has primarily revolved around trading off technical design requirements for aspects of economy, such as capital cost of heat exchangers and utilities. As a result, considerations for safety, operability, and flexibility have received much less attention. This study presents a Pinch An...
Article
Modeling tools for the optimal Hybrid Power Systems (HPS) supply planning and demand management have been relatively established. However, complementary tools that can provide planners, decizion-makers, energy managers and electrical as well as power engineers with graphical and visualization insights that are vital for better conceptual understand...
Article
Full-text available
Rising CO2 emissions that have been primarily attributed to fossil fuel utilisation have motivated extensive research on optimal CO2 reduction planning and management. Carbon (more precisely CO2) capture and storage (CCS) and carbon capture and utilisation (CCU) have been the potential solutions to control CO2 emissions. However, mitigating CO2 emi...
Article
Full-text available
Green assessment tools such as the Building Research Establishment Environmental Assessment Method, Leadership in Energy and Environmental Design, Comprehensive Assessment System for Building Environmental Efficiency, GREEN STAR and HK-BEAM have been used worldwide. These tools, which utilise qualitative, credit-based rating system have several lim...
Article
Catalyst deactivation is one of the major concerns in industrial catalytic reactors. The capability to perform detailed analysis of the catalytic process and its deactivation phenomenon is therefore vital in maintaining high productivity and product quality. Analysis and prediction of the catalyst deactivation mechanism and the rate of deactivation...
Article
Feed-in Tariff (FiT) has been one of the most effective policies in accelerating the development of renewable energy (RE) projects. The amount of RE electricity in the FiT purchase agreement is an important decision that has to be made by the RE project developers. They have to consider various crucial factors associated with RE system operation as...
Article
Full-text available
There has been growing interests to reduce the environmental impact caused by greenhouse gas emissions from process plants through various energy conservation strategies. CO2 emissions are closely linked to energy generation, conversion, transmission and utilisation. Various studies on the design of energy-efficient processes, optimal mix of renewa...
Article
This work presents a holistic approach for design of Cost-Optimal Water Networks (CWN) that considers the economics while exploring all water minimisation options in line with the water management hierarchy (WMH). Two stages are involved in analysing the model i.e., the freshwater saving mode (FWS-mode) and the economic mode (E-mode). The first sta...
Article
Energy is needed in all sectors: industrial, domestic, commercial, transportation, power generation. Fossil fuel has been the main source of energy since decades. Due to rising greenhouse gases (GHG) emissions, the energy mix in many countries are shifting towards alternative energy sources, such as renewable energy and nuclear. At the same time, e...
Article
The development of Process Integration has paved the way for many generic application avenues for the efficient management of energy and resources. However, there is a need to develop a framework to guide industrial site planners to most efficiently exploit and benefit from the suite of Pinch Analysis tools in an integrated manner towards systemati...
Article
The current drive towards sustainability are putting pressure on organizations worldwide to implement procedures to manage the elements of sustainability for an organisation that include emissions, effluent discharge, waste disposal and energy efficiency. Even though these green elements can be managed, monitored and analysed in an integrated manne...
Article
There has been growing interest in developing Locally Integrated Energy Sectors (LIES) as a Process (Heat) Integration approach for synergising the industrial thermal energy systems that include renewable energy resources with urban (i.e. civic, residential, business and service complexes). The aim is to enhance the regional energy efficiency and m...
Article
The application of on-grid hybrid power system (HPS) has been effective for harnessing renewable energy resources and ensuring environmental sustainability. A number of algebraic and mathematical modeling approaches have been introduced for the optimisation of on-grid HPS. While algebraic power pinch analysis (PoPA) tools have been developed to ena...
Article
Diesel power systems are one of the schemes for energy supply generation. However, they are mostly associated with difficulties of emission control and cost of the maintenance on top of the diesel fuel cost. Some of these problems can be reduced by incorporating renewable energy such as wind turbines and solar PV along with the existing diesel stat...
Article
Between 20% and 50% of world energy consumption is lost as waste heat through energy conversion and transportation in manufacturing processes. Within industrial clusters and Locally Integrated Energy Systems (LIES), waste heat recovery for the purpose of heating and power generation has been well established via schemes such as process streams Heat...
Article
Smallholder planters manage almost 40% of Malaysia’s oil palm plantations, indicating that their perception is significant to the success of biofuel produced from palm biomass. The success development of the second generation biofuel can be hampered due to lack of understanding on planter's motive to supply oil palm biomass, which in turn will lead...
Article
The operating cost of a water network can be significantly reduced via utilization of multiple water resources. In a batch process, scheduling plays a vital role towards resource conservation. This work analyzes the effect of multiple water resources on a batch water network schedule. It is proven that, in minimizing the operating cost of a batch w...
Article
The performance of activated carbon (AC) produced from papaya peel (PP) as a locally available bioderived adsorbent in the removal of Pb(II) from metal-contaminated water is reported. Utilization of natural biowastes, such as papaya peel, in this way could assist with waste minimization at the same time as providing a new source of activated carbon...
Article
Full-text available
Herbs are widely utilized in food and health industries. Their beneficial effects to the human body have been attributed to the presence of active phytochemical ingredients with some efficiency for disease treatment as well as for beauty and health enhancement. Public awareness on the adverse effects of synthetic chemical products also increased th...
Article
Full-text available
The application of Pinch Analysis (PA) targeting method has been recently explored to the design of CO2 emission reduction in Total Site planning of CO2 capture, utilisation and storage. The algebraic method based on Problem Table Algorithm (PTA) for Total Site CO2 Integration (TSCI) provides the designer with integrated CO2 capture, utilisation an...
Chapter
A comprehensive and effective carbon emission reduction strategy for a region or country entails addressing both energy supply and energy demand sides covering electricity as well as thermal energy affecting carbon emissions. For stationary emission point sources, carbon is mainly emitted from power generation plants and combustion of fuels. Three...
Article
Full-text available
There are many methods to obtain herbs phytochemicals such as the use of solvents as a phytochemical transfer medium in the extraction process. Currently, solvent is preliminarily selected based on the target phytochemicals and solvent polarities. This is followed by performing experiments to determine the potential solvents blends which give the h...
Chapter
Education for sustainable development (ESD) is a major concern for the 21st century society. In engineering education, the importance of ESD is translated in the Washington Accord by making it a requirement for accreditation of engineering programs. In this chapter, we describe the design and implementation of cooperative problem-based learning (CP...
Poster
Full-text available
The trial-and-error solvent selection method to obtain herbal phytochemicals is time consuming and limited by effort and cost. The combination of property prediction models with computer-assisted search is one way to overcome these drawbacks. Therefore, the objective of this study is to develop a computer aided solvent design methodology for extrac...
Article
In a batch process, either direct or indirect heat integration may be employed. The former involves direct heat transfer from hot to cold process streams. In the latter, heat from a hot process stream is first transferred to an intermediate fluid where the heat is stored until it is finally transferred to a cold stream. Storage of product streams a...
Article
The reduction in embodied carbon footprint is one of the major concerns in the construction industry. Among many other adopted techniques, the use of recycled materials is one of recommended method to lower the environmental effects of construction materials. However, the potential of recycled materials to offset the embodied carbon footprint from...
Article
Water reuse network can reduce tremendously the freshwater consumption and wastewater generation. However, it requires major investment in the piping and pumping as well as reuse tank. Many industries still prefer to buy freshwater and treating all their wastewater as it is typically cheaper. However, this scenario is changing as the freshwater pri...
Article
Green assessment tools such as the Building Research Establishment Environmental Assessment Method, Leadership in Energy and Environmental Design, Comprehensive Assessment System for Building Environmental Efficiency, GREEN STAR and HK-BEAM have been used worldwide. These tools, which utilise qualitative, credit-based rating system have several lim...
Article
Total Site Heat Integration (TSHI) is an extension of Pinch Analysis for energy recovery between processes via centralised utility system. Locally Integrated Energy Sector (LIES) is introduced to integrate renewable energy sources and urban energy consumptions with industrial process. This concept has been extended to utilise the industrial low gra...
Article
In this study, Carica papaya agro-waste (papaya peel) was employed for Pb(II) uptake from single-solute solutions. The papaya peel-derived (PP) adsorbent namely as raw-PP was employed in sets of batch experiments to evaluate its Pb(II) uptake capacity. To assess the surface characteristics of the adsorbents, the scanning electron microscope (SEM) c...
Article
This paper presents a mathematical model to determine the minimum utility targets for a batch process. The model was developed based on the source-demand classification of process streams where each stream was simultaneously treated as a source at its shifted supply temperature and as a demand at its shifted target temperature. The proposed model w...
Article
Optimal CO2 reduction planning can curb the rise in environmental emissions due to the increase in energy demand and utilisation. Carbon (more precisely, CO2) Capture and Storage (CCS) has been one of the proposed solutions to control CO2 emissions. However, mitigating CO2 emissions via CO2 storage in geological reservoirs without utilisation is ne...
Article
Diesel power system is one of the popular schemes for energy supply generation. It is, however, typically associated with high costs of emission control and maintenance on top of the diesel fuel cost. These limitations can be overcome by incorporating renewable energy technologies such as wind turbines and solar PV along with the existing diesel st...
Article
Full-text available
The objective of this paper is to present the initial analysis on the energy recovery and controllability of the existing heat integrated fatty acid fractionation plant. From this initial analysis, the existing heat integrated fatty acid fractionation plant is analysed to know the either the existing heat exchanger networks (HENs) satisfied the des...
Article
Full-text available
This paper presents the control structure decision making for heat exchanger networks (HENs) to obtain operable and flexible network. Delta temperature minimum (DTmin) contribution is considered in this study. Several studies have been done to determine the effect of DTmin-contribution on the annual cost. Usually, HENs designed without consider con...
Article
One of the key concerns of the purification section of purified terephthalic acid (PTA) production plant is the deactivation of palladium supported on carbon (Pd/C) catalyst. In this work, the deactivation rate model of 0.5 wt.% Pd/C catalyst has been developed considering temperature, active surface area, and residual catalytic activity. Moreover,...
Article
Energy targeting and optimal utility placement are among the key steps in the cost-effective design of a process utility system. Composite Curves (CCs) and Grand Composite Curves (GCCs) are the popular Pinch Analysis tools for multiple utility targeting and placement. Although the CCs and GCCs can provide useful insights and yield acceptable utilit...
Conference Paper
Full-text available
This paper presents the effect of delta temperature minimum (∆Tmin) contribution in order to obtain operable and flexible heat exchanger networks (HENs). Several studies have been done to determine the effect of ∆Tmin-contribution on the annual cost. As a result, a trade-off diagram between operating cost, heat exchanger capital cost and economic h...
Article
Selection of energy storage technology in hybrid power systems (HPS) is vital due to the unique advantages and capabilities offered by different storage technologies. For an optimal operation, the efficient and economical storage system for an HPS should be selected. This work introduces a new systematic generic framework to determine the most cost...
Article
Full-text available
This paper explains about the controllability effect on delta temperature minimum (∆T min) in order to get flexible and operable heat exchanger network (HEN). There are many researches based on design and cost effect to ∆T min contribution. However, there are lacks of study on how the ∆T min effect to controllability of HENs. Therefore, this paper...
Article
Pressure drop is an important consideration in Total Site Heat Integration (TSHI). This is due to the typically large distances between the different plants and the flow across plant elevations and equipment, including heat exchangers. Failure to consider pressure drop during utility targeting and heat exchanger network (HEN) synthesis may, at best...