Amisha Chauhan

Brunel University of London

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Hussam Jouhara

Brunel University of London

Bertrand Delpech

Brunel University of London

Sulaiman Almahmoud

Brunel University of London

Theodora Nannou

Brunel University of London

S.A. Tassou

Brunel University of London

L.C. Wrobel

Pontifical Catholic University of Rio de Janeiro

Lujean Ahmad

Brunel University of London

J. Trembley

Air Products (United Kingdom)

Rocio Llera

ArcelorMittal (Spain)

Francisco Lago

ArcelorMittal (Spain)

Cooperative Institutions

Brunel University of London

Centre for Sustainable Energy

Instituto de Tecnología Cerámica

Universitat Jaume I

University of Modena and Reggio Emilia

ArcelorMittal (Spain)

University of Manchester

Air Products (United Kingdom)

University of Sharjah

Aston University

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Energy efficiency enhancement and waste heat recovery in industrial processes by means of the heat pipe technology: Case of the ceramic industry

Energy (2018)

Bertrand Delpech Massimo Milani Luca Montorsi Davide Boscardin Amisha Chauhan

This paper investigates the application of heat-pipe based heat exchanger for improving the energy efficiency of industrial processes. In particular, the case of the ceramic industry is addressed and the potential heat recovery and reduction of fuel consumption is determined. A theoretical model is constructed based on the established, proven performance characteristics of heat-pipe technologies and the performance of the ceramic process are calculated using numerical simulation. The results of the kiln numerical model are then combined to the theoretical model of the heat-pipe based heat exchanger and the heat recovery potential is evaluated as well as the reduction of fuel consumption. The combined theoretical and numerical approach demonstrates that the application of the heat pipes based heat exchanger to the cooling stack of the ceramic kiln enables to recover more than 863 MWh of thermal energy that can be used for heating up the hot air stream of the pre-kiln dryer. Thus, approximately 110,600 Sm3 per year of natural gas can be saved from the burners powering the dryer and the emission of 164 tonnes per year of carbon dioxide can be avoided. Additionally, the avoided cost due to the fuel consumption reduction amounts to more than 22,000 Euro per year. These figures support the application of the heat pipes based heat recovery to the ceramic process from the viewpoint of the improvement the energy efficiency and environmental impact and also of the economic investment.

Energy Recovery

10.1016/j.energy.2018.06.041

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Citations (113)

Using a reflective framework to assess skills – taking a manual BP

British Journal of Nursing (2009)

Amisha Chauhan Helen Noble

This article explores the skill of taking a manual blood pressure (BP) using a stethoscope and sphygmomanometer. Achieving competence in this area has become more difficult since the introduction of electronic BP monitors and less opportunity to practice manually. A reflective framework was used to guide the authors thoughts and actions related to this skill, as they learned how to competently undertake it. A particular learning style, which the authors identified as helpful is also discussed.

Sphygmomanometer

Stethoscope

10.12968/bjon.2009.18.13.43207

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Citations (3)

Waste heat recovery technologies and applications

Thermal Science and Engineering Progress (2018)

Hussam Jouhara Navid Khordehgah Sulaiman Almahmoud Bertrand Delpech Amisha Chauhan

Industrial waste heat is the energy that is generated in industrial processes which is not put into any practical use and is lost, wasted and dumped into the environment. Recovering the waste heat can be conducted through various waste heat recovery technologies to provide valuable energy sources and reduce the overall energy consumption. In this paper, a comprehensive review is made of waste heat recovery methodologies and state of the art technologies used for industrial processes. By considering the heat recovery opportunities for energy optimisation in the steel and iron, food, and ceramic industries, a revision of the current practices and procedures is assessed. The research is conducted on the operation and performance of the commonly used technologies such as recuperators, regenerators, including furnace regenerators and rotary regenerators or heat wheels, passive air preheaters, regenerative and recuperative burners, plate heat exchangers and economisers and units such as waste heat boilers and run around coil (RAC). Techniques are considered such as direct contact condensation recovery, indirect contact condensation recovery, transport membrane condensation and the use of units such as heat pumps, heat recovery steam generators (HRSGs), heat pipe systems, Organic Rankine cycles, including the Kalina cycle, that recover and exchange waste heat with potential energy content. Furthermore, the uses of new emerging technologies for direct heat to power conversion such as thermoelectric, piezoelectric, thermionic, and thermo photo voltaic (TPV) power generation techniques are also explored and reviewed. In this regard, the functionality of all technologies and usage of each technique with respect to their advantages and disadvantages is evaluated and described.

Organic Rankine Cycle

Energy Recovery

Recuperator

10.1016/j.tsep.2018.04.017

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Citations (875)

Experimental and CFD validation of the thermal performance of a cryogenic batch freezer with the effect of loading

Energy (2018)

Amisha Chauhan J. Trembley L.C. Wrobel Hussam Jouhara

Cryogenic freezing systems are used in many industries to preserve food and cell cultures. The freezing methods adopted involve multiple systems to preserve cultures, with many freezing systems using a selection of direct freezing and long-term storage allowing mass and time-efficient freezing methods. However, risks associated with direct freezing using liquid nitrogen can cause cell degradation and crystallisation. This study will focus on the implementation of a batch freezer, using liquid nitrogen sprays to freeze products. The effectiveness of the freezing process will be investigated experimentally for an array of operating conditions. Using numerical methods, additional loading configurations and operation temperatures were also studied to characterise the freezing profile of the system.

Liquid nitrogen

Congelation

Degradation

10.1016/j.energy.2018.12.149

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Citations (12)

Heat pipe based systems - Advances and applications

Energy (2017)

Hussam Jouhara Amisha Chauhan Theodora Nannou Sulaiman Almahmoud Bertrand Delpech

Heat pipes are becoming increasingly popular as passive heat transfer technologies due to their high efficiency. This paper provides a comprehensive review of the state-of-the-art applications, materials and performance of current heat pipe devices. The paper is divided into four main parts; low temperature heat pipes, high temperature heat pipes, thermal modelling of heat pipes and discussion. The low and high temperature sections present an extended list with suitable working fluids and operating temperatures, along with their compatibility with casing materials. Furthermore, the sections focus on some of the most widespread industrial applications, such as solar, nanoparticles, Rankine cycles, nuclear, thermoelectric modules and ceramics, in which heat pipe technologies offer many key advantages over conventional practises. The third part of the paper consists of a thorough analysis of the thermal modelling side of heat pipes. Internal and external thermal modelling techniques, theories and methodologies are presented in this section, for various applications such as non-Newtonian fluids, nano-fluids, solar, geothermal, automotive, hybrid storage and nuclear systems. The final part of the paper discusses the limitations of heat pipes and the reasons why they are not implemented in more aspects of our lives. Operational limitations, cost concerns and the lack of detailed theoretical and simulation analysis of heat pipes are some of the point covered in this section. Finally, some of the recent and future developments in the field are discussed.

Degree Rankine

Renewable heat

10.1016/j.energy.2017.04.028

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Citations (489)

Acid emissions monitoring needs in ceramic tile industry: challenges derived from new policy trends

E3S Web of Conferences (2017)

I. Celades Salvador Olimpo Nava Gomar Fernando Romero Amisha Chauhan Bertrand Delpech

The emission of acid compounds during the manufacture of ceramic tiles is strongly related to the presence of precursors in the raw materials and/or fuels used, with some exceptions such as the production of thermal NOX. The stages with the potential to produce significant emissions of these compounds have been identified as the suspension spray drying and tile firing stages. The monitoring of emission levels of acid pollutants in these stages has turned in a great importance issue from a regulatory and industrial aspect. The DREAM project (https://www.spire2030.eu/dream) will tackle the regulation of acidic emissions focusing in the firing stage. The initial stages of the project have made it possible to identify the design requirements for the monitoring system. This will allow the control of acid pollutants emissions and other key parameters such as pressure, flow, temperature and humidity. One of the tasks developed has been the review and compilation of current emissions monitoring systems detailing technical specifications such as: position (in situ or extractive), measurement principle and frequency. The future policy trends in air pollution are encouraging the continuous monitoring across the European industry. The present document assesses the advantages regarding environmental impact control, highlighting the main challenges for the ceramic tile industry.

Monitoring and control

10.1051/e3sconf/20172200026

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Citations (1)

Experimental and theoretical investigation of the performance of an air to water multi-pass heat pipe-based heat exchanger

Energy (2020)

Hussam Jouhara Sulaiman Almahmoud Daniel Brough Valentin Guichet Bertrand Delpech

In this paper, the performance of a multi-pass heat pipe-based heat exchanger (HPHE) is investigated experimentally and theoretically. The heat pipe system consists of copper heat pipes in a specific equatorially staggered configuration to facilitate heat transportation from a hot gas (air) to a water flow, which cools the condenser section of these heat pipes. The effect of the Reynolds number on the heat transfer rate was studied by altering the number of passes for the evaporator section for the same system by the incorporation of various baffles and by varying the water flow rate. The experimental results have highlighted the strong correlation between heat exchanger performance and the Reynolds number. By increasing the number of passes from one to five, the effectiveness of the HPHE was improved by more than 25%. It has been demonstrated that increasing the number of passes increases the Reynolds number of the flow, leading to higher heat transfer coefficients and lower thermal forced convection resistances. The HPHE overall performance, as well as, the outlet temperatures of the fluids were predicted through two theoretical models, based on the Log Mean Temperature Difference (LMTD) method and the Effectiveness-Number of Transfer Units (ε-NTU) method. The predictions were compared with experimental results and the accuracy of the models reported. The validation showed that the developed iterative LMTD model predicted the performance of the HPHE within ±15.5% error. In comparison, the ε-NTU model predicted the total effectiveness with a maximum error of 19% and was able to predict the outlet temperatures of both air and water streams within an accuracy of ±0.7 °C. The reported research is of importance for the application of heat pipe heat exchangers in waste heat recovery. Finally, knowledge is provided on the accuracy of the available prediction models.

Condenser (optics)

NTU method

Baffle

10.1016/j.energy.2020.119624

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Citations (42)

Experimental and theoretical investigation of a flat heat pipe heat exchanger for waste heat recovery in the steel industry Energy

Hussam Jouhara Sulaiman Almahmoud Amisha Chauhan B Delpech Giuseppe Bianchi

Recuperator

Heat energy

Source

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Citations (2)

Low-temperature heat transfer mediums for cryogenic applications

Journal of the Taiwan Institute of Chemical Engineers (2023)

Hussam Jouhara Amisha Chauhan Valentin Guichet Bertrand Delpech Mohammad Ali Abdelkareem

Researchers and industrialists have grown interested in cryogenic technologies over the years. Cryogenic heat transfer has enabled new applications due to material properties and behaviour at very low temperatures. This domain is still underdeveloped and unfamiliar in various applications. This work discusses the recent progress on cryogenic mediums and their respective use in different heat transfer applications. After identifying what is commonly designated as a cryogenic medium, i.e., those with a boiling point below -150 °C, the different characteristics and features of such mediums are critically discussed. Liquid He and N2 were found to be the most used cryogenic mediums, mainly due to the very low temperature attained by liquid He, as the closest to the absolute zero, along with the low cost and high availability of liquid N2. The use of liquid-phase cryogenic in a single-phase state was found to be the most common application method. Two-phase applications of the cryogenic medium are mainly for use in a heat pipe, in which both latent and sensible heat is utilized. Cryogenic mediums are essential for critical and niche applications such as in aerospace, superconductivity, advanced machining and manufacturing methods, and more critically in many healthcare applications and advanced scientific research.

Cryogenics

Boiling point

10.1016/j.jtice.2023.104709

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Citations (13)

The Review on Cosmetic Regulation: Quality Education

ECS Transactions (2022)

Amisha Chauhan Shikha Baghel Chauhan Sakshi Nainwani

The cosmetics industry is undergoing substantial transformations all over the world. It has grown dramatically over the world, providing a means for a person to alter his or her appearance and make a product instantly noticeable and appealing. To accomplish effective promoting, one must consider a variety of factors. Today's cosmetic industry or market takes use of cutting-edge technology to create new cosmetic agents with enhanced qualities. Trend for cosmetics is getting elevated each passing day, hence enormous growth is encountered in the cosmetic market globally. If we talk about legislation of the cosmetic industries nowadays then they are kind of stringent all over the globe. There are different regulatory bodies globally with their own rules and regulation regarding cosmetics. The major market for cosmetics is in United states and in European Union, and all other developing countries ideally look the regulation of these developed countries as a role model. Despite of all the differences in regulatory bodies their aim is somewhat similar which is to ensure the safety, efficacy, and stability of the product. So, in this article we are going to study about the various differences which are present regarding the regulatory bodies and rules and regulation among India, United States and European Union.

Cosmetic Industry

Globe

10.1149/10701.0241ecst

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Citations (1)