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Papers by Babak Rashidian

Research paper thumbnail of Modeling of the Heat Pipe Heat Exchangers for Heat Recovery

Research has been carried out on the theory, design and construction of heat pipes, especially th... more Research has been carried out on the theory, design and construction of heat pipes, especially their use in heat pipe heat exchangers for energy recovery, reduction of air pollution and environmental conservation. Heat pipe heat exchangers are widely used for heat recovery in various ranges of applications because of their simple structure, special flexibility, high efficiency, good compactness and excellent reversibility. Heat recovery from fire heaters or turbine flue gases is an important application for this type of heat transfer devise. In this paper a computer simulation was developed by MATLAB to design the heat pipe heat exchangers. This program can be considered as a simple tool for modeling and designing heat pipe heat exchangers.

Research paper thumbnail of Novel Method for Cancer Cell Apoptosis by Localized Uv Light with Gold Nanostructures: A Theoretical Investigation

Nano, 2010

A novel approach for phototherapy is proposed. The proposed method is based on cell apoptosis acc... more A novel approach for phototherapy is proposed. The proposed method is based on cell apoptosis according to halting activation of cancer cell membrane receptor by exposure to UV light pulses without any side effect. In the proposed method, gold nanoparticles are directed to cancerous cells by conjugating their surface with specific ligands. UV light is created locally adjacent to cells around the gold nanoparticles. UV light is generated due to nonlinear interaction of visible light with gold nanoparticles because of enhancement in third order nonlinear effects. For example, by using 780 nm laser, 260 nm UV will be generated around the nanoparticle because of third harmonic generation process. As the generated UV is localized around the cell, there will be no side effect for other cells. We have numerically analyzed the proposed method by solving Maxwell's equation considering third order nonlinear susceptibility and dispersion behavior of permittivity by 3D nonlinear finite diff...

Research paper thumbnail of Effect of freeboard deflectors on the exergy in a fixed bed combustor

Applied Thermal Engineering

Abstract Deflectors have been employed in industrial combustors and boilers with an expectation t... more Abstract Deflectors have been employed in industrial combustors and boilers with an expectation they reduce both radiation heat losses from the fuel bed and impact particle emissions. Despite much research into lab-scale biomass combustion, there have been no systematic studies to investigate the effects of deflectors on the axially resolved and flue gas availability in laboratory scale fixed bed biomass combustors. This study includes experiments conducted on a continuous feed pellet combustor, with a freeboard deflector located at different axial locations. The aim is to characterize the relative impact of freeboard deflectors on the mechanical exergy profiles and exhaust gas total exergy, over a range of stoichiometry (primary and secondary air flow rates). Results indicate that deflectors affect the mechanical exergy in the downstream, however their influence depends on their relative (axial) position (H). Furthermore, results reveal that for the tests with and without deflector, both CO chemical exergy and total exergy decrease in a similar manner when the air-fuel equivalence ratio (λ) increases. It has been found that deflectors do not appear to affect the total and CO chemical exergy at the exhaust section of a lab-scale combustor, bearing in mind a ±3% variation in temperature, CO emissions as well as exergies is estimated based on the uncertainty analyses undertaken.

Research paper thumbnail of Distributed Generation CHP System by Heat Pipes, a Novel Approach to More Energy Saving in Buildings

These days, increasing energy consumption in the residential sector is an attractive motivation t... more These days, increasing energy consumption in the residential sector is an attractive motivation to employ distributed generation as an effective solution for buildings increasing energy demand. Moreover, the residential sector not only is the main power consumer , but also has the highest share of natural gas consumption, so each effort to reclaim energy demand in buildings has a tremendous effect on the power and energy market , . DG CHP systems generate power on-site or near-site. So, they can fundamentally transform the delivery mechanism for electric power by significantly improving the reliability of the power grid and increasing the overall efficiency of energy conversion. Building CHP systems can increase efficiency of the natural gas engine from 45% for conventional power generation systems up to 85% for total power and heat generation . In this paper, gas engine DG CHP systems based on the heat pipe heat exchanger are introduced as a novel approach to find more efficient, reliable and compact CHP systems especially in buildings. Heat pipes are widely used for heat recovery and energy saving in various ranges of applications because of their simple structure, special flexibility, high efficiency, good compactness and excellent reversibility. In this research, the application of suggested optimum DG-CHP system by heat pipe will be analyzed in a sample building and the results will be presented. Results show that CHP systems designed by this novel approach are economical for use in residential buildings.

Research paper thumbnail of Modeling of the Heat Pipe Heat Exchangers for Heat Recovery

Research has been carried out on the theory, design and construction of heat pipes, especially th... more Research has been carried out on the theory, design and construction of heat pipes, especially their use in heat pipe heat exchangers for energy recovery, reduction of air pollution and environmental conservation. Heat pipe heat exchangers are widely used for heat recovery in various ranges of applications because of their simple structure, special flexibility, high efficiency, good compactness and excellent reversibility. Heat recovery from fire heaters or turbine flue gases is an important application for this type of heat transfer devise. In this paper a computer simulation was developed by MATLAB to design the heat pipe heat exchangers. This program can be considered as a simple tool for modeling and designing heat pipe heat exchangers.

Research paper thumbnail of Novel Method for Cancer Cell Apoptosis by Localized Uv Light with Gold Nanostructures: A Theoretical Investigation

Nano, 2010

A novel approach for phototherapy is proposed. The proposed method is based on cell apoptosis acc... more A novel approach for phototherapy is proposed. The proposed method is based on cell apoptosis according to halting activation of cancer cell membrane receptor by exposure to UV light pulses without any side effect. In the proposed method, gold nanoparticles are directed to cancerous cells by conjugating their surface with specific ligands. UV light is created locally adjacent to cells around the gold nanoparticles. UV light is generated due to nonlinear interaction of visible light with gold nanoparticles because of enhancement in third order nonlinear effects. For example, by using 780 nm laser, 260 nm UV will be generated around the nanoparticle because of third harmonic generation process. As the generated UV is localized around the cell, there will be no side effect for other cells. We have numerically analyzed the proposed method by solving Maxwell's equation considering third order nonlinear susceptibility and dispersion behavior of permittivity by 3D nonlinear finite diff...

Research paper thumbnail of Effect of freeboard deflectors on the exergy in a fixed bed combustor

Applied Thermal Engineering

Abstract Deflectors have been employed in industrial combustors and boilers with an expectation t... more Abstract Deflectors have been employed in industrial combustors and boilers with an expectation they reduce both radiation heat losses from the fuel bed and impact particle emissions. Despite much research into lab-scale biomass combustion, there have been no systematic studies to investigate the effects of deflectors on the axially resolved and flue gas availability in laboratory scale fixed bed biomass combustors. This study includes experiments conducted on a continuous feed pellet combustor, with a freeboard deflector located at different axial locations. The aim is to characterize the relative impact of freeboard deflectors on the mechanical exergy profiles and exhaust gas total exergy, over a range of stoichiometry (primary and secondary air flow rates). Results indicate that deflectors affect the mechanical exergy in the downstream, however their influence depends on their relative (axial) position (H). Furthermore, results reveal that for the tests with and without deflector, both CO chemical exergy and total exergy decrease in a similar manner when the air-fuel equivalence ratio (λ) increases. It has been found that deflectors do not appear to affect the total and CO chemical exergy at the exhaust section of a lab-scale combustor, bearing in mind a ±3% variation in temperature, CO emissions as well as exergies is estimated based on the uncertainty analyses undertaken.

Research paper thumbnail of Distributed Generation CHP System by Heat Pipes, a Novel Approach to More Energy Saving in Buildings

These days, increasing energy consumption in the residential sector is an attractive motivation t... more These days, increasing energy consumption in the residential sector is an attractive motivation to employ distributed generation as an effective solution for buildings increasing energy demand. Moreover, the residential sector not only is the main power consumer , but also has the highest share of natural gas consumption, so each effort to reclaim energy demand in buildings has a tremendous effect on the power and energy market , . DG CHP systems generate power on-site or near-site. So, they can fundamentally transform the delivery mechanism for electric power by significantly improving the reliability of the power grid and increasing the overall efficiency of energy conversion. Building CHP systems can increase efficiency of the natural gas engine from 45% for conventional power generation systems up to 85% for total power and heat generation . In this paper, gas engine DG CHP systems based on the heat pipe heat exchanger are introduced as a novel approach to find more efficient, reliable and compact CHP systems especially in buildings. Heat pipes are widely used for heat recovery and energy saving in various ranges of applications because of their simple structure, special flexibility, high efficiency, good compactness and excellent reversibility. In this research, the application of suggested optimum DG-CHP system by heat pipe will be analyzed in a sample building and the results will be presented. Results show that CHP systems designed by this novel approach are economical for use in residential buildings.