Hasan Demir

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Verified

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• PhD
• Professor (Full) at Osmaniye Korkut Ata University

Considering the lack of sustainability of organic fossil fuels, which serve as the fundamental energy source for people, it is imperative to increase the usage of renewable air conditioning applications. The experimental configuration used in this work was specifically engineered to replicate the consistent temperature of the wall present behind so...

The integration of PCM beneath PV panels is a distinctive engineering application for thermal control and energy efficiency. Optimal and steady energy generation is attained from diurnal temperature variations by the utilization of various tilt angles. This study examined the impact of tilt angles (20°, 35°, and 50°) and honeycomb fin diameter on t...

This work investigated the thermal behavior of phase change material during the melting process in a two-dimensional (2D) plate intended for thermal energy storage. The analytical and numerical analyses were conducted for both one phase and twophase systems. The numerical analysis was conducted using the Mathematica program, while the COMSOL Multip...

This manuscript focuses on comprehensive investigation of entropy analysis and improve energy storage of phase change material (PCM) using a honeycomb material. In the last decade, the honeycomb structure has quickly emerged as a major tool for improving heat transfer rate, particularly for the back of solar radiation PV panels. The aim of this stu...

This study aimed to investigate the drying kinetics of capers at different temperatures and to examine the morphological changes of capers during the drying and rehydration processes. Computer‐aided image processing and Artificial Neural Network models (ANN) were used to analyze the shrinkage and moisture ratio of capers (drying) and the expansion...

In this paper, membrane-based tubular liquid desiccant dehumidification system was designed, and its dehumidification performance was investigated. In the manufactured system, two different membranes, synthetic sausage casing and Tyvek® Solid were used. The air Reynolds number (Re) was varied during the experiments to investigate effect of air velo...

The contribution of twelve principle of green chemistry to the seventeen goals of sustainable development is reviewed, and its bibliometric features were given that reveals the characteristics of the published papers. The bibliometric analysis was performed on the literature cited in the SCOPUS and WoS from past to 2022. The applied search was (ALL...

One of the essential factors for the selection of the drying process is energy consumption. This study intended to optimize the drying treatment of capers using convection (CD), refractive window (RWD), and vacuum drying (VD) combined with ultrasonic pretreatment by a comparative approach among artificial neural networks (ANN) and response surface...

Adsorption heat storage is the most feasible technology for heating decarbonization, which can store large quantities of waste and renewable heat for an exceptionally long time. However, utilizing adsorption heat storage in geographical locations with sub-zero ambient conditions is challenging. Therefore, this paper experimentally investigates the...

There has been an increasing interest in adsorption cooling and heat pumps as the most feasible green alternative to conventional vapor compression technology. Recent developments in adsorption cooling highlighted the need for cost-efficient adsorption pairs of advanced adsorption characteristics. In response, this article experimentally investigat...

In the last year, a continuous deeply increase in energy demands for cooling purposes is observed. Such energy needs are mainly satisfied through conventional vapour compressor chiller (VCC), which foresee the use of electricity usually generated through conventional energy sources. As an alternative, solar cooling plants offer a reliable and envir...

Bu çalışmada, anülus kanalda hava-hava arasında nem geçişinde membranın etkisi incelenmiş, nemli hava-kuru hava akışkanları için matematiksel modelleme yapılmıştır. Oluşturulan modelin paralel ve karşıt akış tiplerinde COMSOL Multiphysics yazılımı kullanılarak kütle transferi eşitlikleri çıkarılıp analizler gerçekleştirilmiştir. Sistemin MATLAB yaz...

The main objective of this study is to design a low-grade heat driven ethanol-silica gel adsorption chiller. The low-grade waste heat is utilized in an adsorption chiller. For this purpose, an innovative bed heat exchanger including a condenser embedded inside the adsorbent bed is uniquely designed. The silica gel/ethanol pair is examined both anal...

Solar Cooling plants offer a reliable and environmentally friendly alternative to conventional electrically powered chillers for satisfying the building cooling demand. Although many types of research have analysed the performances of heat-driven chillers, these systems need to further detailed studies to highlight their potential for satisfying th...

One of the most common adsorbents used in adsorption heat pumps (AHP) is silica gel. Many studies on adsorptive working with silica gel such as water, R134a, etc. can be found. On the other hand, the studies for another adsorptive working with silica gel as a pair are limited in the literature. Thus, this study is focusing on the acetone and ethano...

The study focuses on improving operation and construction parameters that affect cooling performance novel adsorption chiller with a unified condenser-adsorbent bed. The effect of the variables on novel adsorption chiller is taken into consideration. The cooling performance of the chiller is analyzed using the central composite design and response...

This study aims experimental and numerical investigation of an adsorption chiller having a new combined condenser-adsorbent bed. The designed and manufactured adsorption chiller having a shell and tube type adsorbent bed consisting of 444 tubes of 10 mm inner diameter is simulated. The experimental cycle of the adsorption chiller was successfully o...

The aims of the present study are to design and perform the analysis of a dual-ejector refrigeration system (DER). The system is constructed by adding a second ejector and a refrigeration pump to the classical single-ejector refrigeration system (SER). In the theoretical analysis, two different refrigerants are employed, R134a and R600, and the coo...

In this paper, in order to increase the adsorption chiller performance a new type adsorbent bed with embedded condenser is designed and constructed. By this condenser embedded adsorbent bed design, not only the performance increase but also the weight reduction of the adsorption chiller is achieved. Experiments were performed with Silica gel RD typ...

In this paper, in order to increase the adsorption chiller performance a new type adsorbent bed with embedded condenser is designed and constructed. By this condenser embedded adsorbent bed design, not only the performance increase but also the weight reduction of the adsorption chiller is achieved. Experiments were performed with Silica gel RD typ...

The World Health Organization states that daily water requirement of a person is between 50 and 100 litres for basic needs and few health concerns. The humans regardless of their status and societal conditions have right to reach enough and safe quantity of water for their basic needs. In the world 13.6 % of the world population could not access sa...

The present study comprises an experimental and numerical simulation of a counter flow membrane-based annular pipe liquid desiccant air conditioner (AP_LDAC) system. The experimental rig was constructed by using DuPont™ Tyvek® Solid as semi-permeable membrane and it has simplier structure compared to other types of membrane-based dehumidifiers. To...

In this study, energy and exergy analysis of experimental results obtained from a dehumidification system using LiBr-aq (lithium bromide-water) and LiCl-aq (lithium chloridewater) as desiccant was made. In dehumidifier and regenerator columns polycarbonate sheets, which have not been used before, were used as packing material to increase contact ar...

This study aimed to perform numerical simulation of the onion drying process considering its deformed geometry. For this purpose, transport phenomena such as heat and mass transfer in the onion structure and water vapor transfer in its porous structure were simulated in 3D form with Darcy's law during the vacuum drying process for onions. The simul...

The study covers recent statistical data of the principles of Green Chemistry, a bibliometric study of research and review papers published between 1999 and 2018, and recent trends of research topics on Green Chemistry. This study collects, processes and refines available information in scientific area. The authors have provided recent statistical...

In this study, a tubular membrane-based liquid desiccant air-conditioning system was numerically simulated to obtain mass transfer correlation. The design parameters for the membrane-based liquid desiccant system (Re numbers and aspect ratio, L/D) were also optimized using the numerically obtained results. The mass transfer correlation was develope...

The present chapter comprehends bibliometric features and characteristics of the research papers related to water remediation. The information used to build this bibliometric study was composed of scientific research papers indexed in Science Citation Index, Science Citation Index Expanded, Journal Citation Reports and Engineering Index. The analys...

A numerical simulation is performed for an innovative star fin type adsorbent bed with metal additive in order to determine the optimum geometrical parameters. Also, the effect of the addition of metal additives to the adsorbent bed on performance of an adsorption chiller is analyzed. The Fuji RD-type silica gel/water is used as the adsorbent/adsor...

In this study, a flame retardent composite similar to a commercial flame retardent masterbatch was aimed to be developed. The commercial masterbatch was characterized by its functional groups, the elemental composition, crystal structure, morphology and thermal stabilitiy and flame retardency (LOI index). It was a polypropylene matrix composite fil...

Artan yaşam standartlarıyla beraber mekânlarda insanların iç konfor ihtiyacı da artmaktadır. Günümüzde iç konfor şartları yaygın olarak konvansiyonel buhar sıkıştırmalı sistemlerle yapılmasına karşın, bu sistemlerin yüksek oranda elektrik enerjisine bağımlı olması, sınırlı nem kontrolü sağlaması ve iç havayı temizlemede yetersiz olması dikkat çekme...

Adsorption chiller technology is one of the most effective ways to convert waste thermal energy into cooling. An adsorption chiller is a kind of thermal heat pump which is a promising system due to its ability for recovering heat from the thermal source at low-temperature levels and providing cooling and/or heating effects. It has advantages such a...

The design of the adsorbent bed is one of the most important issues for the performance of an adsorption heat pump (AHP). It also directly affects the weight and space could be one of the most important drawbacks. In this context, a numerical model is developed for a radial adsorbent bed assisted with microwave heating. The effect of adsorbent bed...

The aim of this study is to investigate the effect of ultrasound propagation on the adsorption of methyl orange by Luffa cylindrica. Kinetics of adsorption was studied at 30 and 50 \({^{\circ }}\hbox {C}\). Adsorption isotherms were investigated at three different medium temperatures (30, 40 and 50 \({^{\circ }}\hbox {C}\)) for ultrasound and shaki...

Environmentally friendly and thermal driven open liquid desiccant system was designed and manufactured in this study. The scope of this study was to investigate the potential usage of polycarbonate boards as new packing material in an open CaCl2-water desiccant system which has relatively high surface tension among other conventional polymeric mate...

In this study, a LiBr-aq (lithium bromide-water) dehumidification system which mass transfer problems eliminated and operates under atmospheric conditions was experimentally investigated. In the system, polycarbonate sheets were used which were produced by cutting the 6 mm and 10 mm thick polycarbonate materials into 30°, 45° and 60° channel angles...

In this study, energy and exergy analysis of a dehumidification system using two different aqueous solutions which LiBr-aq (lithium bromide-water) and LiCl-aq (lithium chloride-water) as desiccant was made by using experimental results. In dehumidifier and regenerator columns polycarbonate sheets, which have not be used before, were used as packing...

In this study, a LiBr-aq (lithium bromide-water) dehumidification system which mass transfer problems eliminated and operates under atmospheric conditions was experimentally investigated. In the system, polycarbonate sheets were used which were produced by cutting the 6 mm and 10 mm thick polycarbonate materials into 30°, 45° and 60° channel angles...

N E Ç I K A N L A R • Sıvı desikant nem alma sisteminin tasarımı • Absorber ve rejeneratörde polikarbon levha kullanımı • Sıvı desikant nem alma sisteminin termodinamik analizi Makale Bilgileri ÖZET Geliş: 24.02.2016 Kabul: 20.03.2017 DOI: Bu çalışmada, mekanik nem alma sistemlerinin yerine kullanılabilecek bir sıvı desikant nem alma sisteminin tas...

The aim of this study was to improve performance indices of open liquid desiccant system by using polycarbonate boards having higher surface tension and surface active additive. For this purpose, investigation surface active additive which is based on polyether modified siloxane was used to reduce surface tension difference between packing and desi...

The design of adsorbent bed is one of the most important issue for the performance of an adsorption heat pump (AHP). It also directly affects the weight and space could be one of the most important drawback. In this context, a numerical model is developed for a cylindrical shape adsorbent bed assisted with microwave heating. The effect of both the...

The aim of this study was to improve performance indices of open liquid desiccant system by using polycarbonate boards having higher surface tension and surface active additive. For this purpose, polycarbonate boards of 6 and 10 mm thicknesses creating two different surface areas were employed in the designed and manufactured open liquid desiccant...

Human indoor comfort requirements in places increase with increasing life standarts. Nowadays, despite indoor comfort conditions are provided by conventional vapor compression systems, it is noteworthy that these systems are highly dependent on electrical energy, limited humidity control and inadequate air cleaning. In conventional vapor compressio...

The objective of this study is to design and test a liquid dehumidification system that can operate with a maximum performance under atmospheric conditions without any mass transfer problems. For this purpose, polycarbonate panels were used as packing materials in the absorber and desorber innovatively. Polycarbonate has high surface tension among...

The aim of this study was to investigate the potential use of polycarbonate boards as packing material in the design of an open liquid desiccant system. The open liquid desiccant system was designed and manufactured using this new packing material due to its higher surface tension relative to the other conventional polymeric materials. 6 mm of poly...

The electric vehicle (EV) has widely be used in recent years and consequently the battery thermal management (BTM) of the EV's has gained attention of researchers. If the HVAC and BTM systems of the electric vehicles are improved, the battery life period and the state of charge rate will increase. Although many studies were performed on this issue,...

The metal ion-binding properties of two 27-membered macrocycles with N2S5O2 donor atoms 1 and 2 were investigated using solvent extraction experiments. In order to explain complexation behavior of macrocycles, extraction of ions in the interfacial region of liquid-liquid phase was modeled by Langmuir adsorption isotherm. The macrocycles 1 and 2 ext...

The present experimental study includes comparison of microwave regenerated and conventional heated adsorbent bed of adsorption heat pump. The novel adsorption heat pump driving with microwave heating system was designed and manufactured. Microwave oven was constructed for providing homogeneous temperature distribution in the adsorbent bed. Tempera...

A new aspect of liquid–liquid extraction by using the adsorption isotherm approach at divided interface was described. In order to explain complexation behavior of ligands, extraction of ions in the interfacial region of liquid–liquid phase can be modeled by Langmuir adsorption isotherm. A series of macrocycles of different ring sizes with differen...

A microwave-regenerated adsorption heat pump system was manufactured and experimentally examined. The influence of the operation time of a microwave oven on the performance of the adsorption heat pump was investigated in this study. The performance criteria, i.e., coefficient of performance, specific cooling power and volumetric cooling power, were...

A flame retardant composite similar to a commercial flame retardant masterbatch was aimed to be developed in this study. The commercial masterbatch was characterized by its functional groups, the elemental composition, crystal structure, morphology, and thermal stability, and limiting oxygen index (LOI). It was a polypropylene matrix composite fill...

A microwave assisted zeoliteewater adsorption heat pump system was designed, manufactured and investigated experimentally. The influence of operation time of microwave oven on performance of the adsorption heat pump was studied. The performance criteria: coefficient of performance, specific cooling power and volumetric cooing power, were calculated...

An intumescent system consisting of ammonium polyphosphate (APP) as an acid source and blowing agent, pentaerythritol (PER) as a carbonific agent and natural zeolite (clinoptilolite, Gördes II) as a synergistic agent was used in this study to enhance flame retardancy of polypropylene (FR-PP). Zeolite was incorporated into flame retardant formulatio...

Adsorption heat pumps have considerably sparked attentions in recent years. The present paper covers the working principle of adsorption heat pumps, recent studies on advanced cycles, developments in adsorbent–adsorbate pairs and design of adsorbent beds. The adsorbent–adsorbate pair features for in order to be employed in the adsorption heat pumps...

The effects of coupling agents on the mechanical, morphological, and water sorption properties of luffa fiber (LF)/polypropylene(PP) composites were studied. In order to enhance the interfacial interactions between the PP matrix and the luffa fiber, three different types of coupling agents, (3-aminopropyl)-triethoxysilane (AS), 3-(trimethoxysilyl)-...

In the present study, heat and mass transfer equations for an adsorbent bed are solved, numerically. The study is performed for silica gel (Davidson Type A)-water pair. The temperature, pressure, and concentration fields in the bed through the cycle, and subsequently the specific cooling power for the considered bed under the assumed operation cond...

A numerical analysis of the heat and mass transfer in an adsorbent bed during an isobaric desorption process of adsorption heat pump cycle was simulated for various power of microwave (180 and 360W). The influence of power of microwave on the regeneration of adsorbent bed during isobaric desorption process was investigated.

h i g h l i g h t s < Comparison conventional and microwave heating for AHP. < Numerical analysis of the heat and mass transfer in bed of AHP. < AHP cycle was improved around 20% with the microwave regeneration. < COP for the microwave heated cycle was improved by 61%. a b s t r a c t The heat transfer problem of an adsorption heat pump during the...

The heat and mass transfer equations governing an adsorbent bed in an adsorption heat pump and the mass balance equation for the adsorbent particles in the adsorbent bed were solved numerically to simulate the cycle of a basic adsorption heat pump, which includes isobaric adsorption, isosteric heating, isobaric desorption, and isosteric cooling pro...

Water vapor adsorption on silica gel was investigated using Tian–Calvet-type microcalorimetry. Differential heat of adsorption data was obtained. The setup of microcalorimetry was used volumetric system to determine adsorption isotherms of water vapor–silica gel. The Langmuir model was used in the interpretation of the adsorption data. The Clausius...

Water Silica gel Improvement Adsorber Additive Particle Metal Thermal conductivity Bed a b s t r a c t The effects of metal piece additives on effective thermal conductivity and diffusivity of an unconsolidated adsorbent bed in which adsorbent is silica gel were investigated. The metal piece additives were copper, brass, aluminum and stainless stee...

A cycle of adsorption heat pump consists of two isosteric and two isobaric processes. The pressure of adsorbent bed is preferred to be constant during the isobaric adsorption and desorption processes to have constant evaporation and condensation temperatures. In the present study, the effects of desorption heating rate and insufficient condenser ca...

In the present study, the mechanism of heat and mass transfer in an annulus adsorbent is handled. The heat and mass transfer equations for the adsorbent bed and the mass balance equation for the adsorbent granules are numerically solved to obtain the distributions of temperature, pressure, adsorptive density and adsorbate concentration in the adsor...

Present study covers thermodynamical analysis and testing of an intermittent adsorption heat pump. The adsorbent bed was filled with silica gel granule and it has special design. Heat transfer in the adsorbent bed is accelerated by fin blocks while free spaces in middle of the adsorbent bed and between the blocks accelerate adsorptive transfer. Wat...

Using natural Luffa cylindrica fibers as adsorbent removal of methylene blue dye from aqueous solutions at different temperatures and dye concentrations was investigated in this study. Thermodynamics and kinetics of adsorption were also investigated. The adsorption isotherms could be well defined with Langmuir model instead of Freundlich model. The...

Heat and mass transfer in porous adsorbent bed of an adsorption heat pump is numerically analyzed. Two differential equations which are continuity and energy equations are derived and simultaneously solved to obtain distribution of temperature and adsorptive density in the porous adsorbent bed. A code based on the finite difference method was writt...

Present study covers thermodynamical analysis and testing of an intermittent adsorption heat pump. The adsorbent bed was filled with silica gel granule and it has special design. Heat transfer in the adsorbent bed is accelerated by fin blocks while free spaces in middle of the adsorbent bed and between the blocks accelerate adsorptive transfer. Wat...

The testing and thermodynamic analysis of an intermittent adsorption heat pump is presented in this study. The designed pump is composed of an evaporator, a condenser and an adsorbent bed filled with silica-gel adsorbent. The working fluid is water. The operation pressures for adsorption heat pump are 1.2 and 14.2 kPa. A performed cycle is drawn an...

In this study, effects of Ca/Zn stearate and organotin heat stabilizers and zeolite, CaCO 3 , cellulose and luffa flours fillers, and their concentrations (2.5, 5, 10 and 20% by weight) on production of flexible PVC foams by chemical blowing agent, azodicarbonamide were inves-tigated. Foam morphology, foam density, compressive mechanical properties...

Adsorption heat pumps have considerably sparked attentions in recent years. The present paper covers the working principle of adsorption heat pumps, recent studies on advanced cycles, developments in adsorbent-adsorbate pairs and design of adsorbent beds. The requirements for the adsorbent-adsorbate pairs in order to be employed in the adsorption h...

An intumescent system including ammonium polyphosphate (APP) as an acid source and blowing agent, pentaerythritol (PER) as a carbonific agent and colemanite as a synergistic agent is used to enhance flame retardancy of polypropylene (FR-PP). In order to investigate the synergism between colemanite and the flame retardant materials (APP and PER), D-...

The thermal degradation and flammability of intumescent fire-retardant polypropylene matrix composites consisting of ammonium polyphosphate (APP) as an acid source and blowing agent, pentaerythritol (PER) as a carbonisation agent and natural zeolite (clinoptilolite rich, Go¨ rdes II) as a synergistic agent were examined. APP and PER combinations we...