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Kalantar Mehrjerdi, AdibORCID iD iconorcid.org/0000-0002-5725-586X
Alternative names
Publications (10 of 14) Show all publications
Kurevija, T., Kalantar Mehrjerdi, A., Macenić, M. & Hranić, J. (2019). Investigation of Steady-State Heat Extraction Rates for Different Borehole Heat Exchanger Configurations from the Aspect of Implementation of New TurboCollector™ Pipe System Design. Energies, 12
Open this publication in new window or tab >>Investigation of Steady-State Heat Extraction Rates for Different Borehole Heat Exchanger Configurations from the Aspect of Implementation of New TurboCollector™ Pipe System Design
2019 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 12Article in journal (Refereed) Published
Abstract [en]

When considering implementation of shallow geothermal energy as a renewable source for heating and cooling of buildings, special care should be taken in the hydraulic design of the borehole heat exchanger system. Laminar flow can occur in pipes due to the usage of glycol mixtures at low temperature or inadequate flow rates. This can lead to lower heat extraction and rejection rates of the exchanger because of higher thermal resistance. Furthermore, by increasing the flow rate to achieve turbulent flow and satisfactory heat transfer rate can lead to an increase in the pressure drop of the system and oversizing of the circulation pump which leads to impairment of the seasonal coefficient of performance at the heat pump. The most frequently used borehole heat exchanger system in Europe is a double-loop pipe system with a smooth inner wall. Lately, development is focused on the implementation of a different configuration as well as with ribbed inner walls which ensures turbulent flow in the system, even at lower flow rates. At a location in Zagreb, standard and extended thermal response tests were conducted on three different heat exchanger configurations in the same geological environment. With a standard TRT test, thermogeological properties of the ground and thermal resistance of the borehole were determined for each smooth or turbulator pipe configuration. On the other hand, extended Steady-State Thermal Response Step Test (TRST) incorporates a series of power steps to determine borehole extraction rates at the defined steady-state heat transfer conditions of 0/−3 °C. When comparing most common exchanger, 2U-loop D32 smooth pipe, with novel 1U-loop D45 ribbed pipe, an increase in heat extraction of 6.5% can be observed. Also, when the same comparison is made with novel 2U-loop D32 ribbed pipe, an increase of 18.7% is achieved. Overall results show that heat exchangers with ribbed inner pipe wall have advantages over classic double-loop smooth pipe designs, in terms of greater steady-state heat extraction rate and more favorable hydraulic conditions.

Place, publisher, year, edition, pages
MDPI, 2019
National Category
Engineering and Technology
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-16066 (URN)10.3390/en12081504 (DOI)
Available from: 2019-04-29 Created: 2019-04-29 Last updated: 2019-04-29Bibliographically approved
Kalantar Mehrjerdi, A. (2019). Investigation of steady-state heat extraction rates for different borehole heat exchangerconfiguration from the aspect of implementation of new passive turbulator pipe systemdesign. In: : . Paper presented at 32nd International Conference on Efficiency, Cost, Optimization,Simulation and Environmental Impact of Energy Systems, Wrocław, 23–28 June, 2019..
Open this publication in new window or tab >>Investigation of steady-state heat extraction rates for different borehole heat exchangerconfiguration from the aspect of implementation of new passive turbulator pipe systemdesign
2019 (English)Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:hb:diva-21457 (URN)
Conference
32nd International Conference on Efficiency, Cost, Optimization,Simulation and Environmental Impact of Energy Systems, Wrocław, 23–28 June, 2019.
Available from: 2019-07-22 Created: 2019-07-22 Last updated: 2019-08-05Bibliographically approved
Kalantar Mehrjerdi, A., Naudin, S. & Skrifvars, M. (2017). Development of Polyolefin Compound and Post-Polymerization Treatments for Ground Heat Exchangers. In: : . Paper presented at IGSHPA Technical/Research Conference and Expo, Devner, March 14-16, 2017.
Open this publication in new window or tab >>Development of Polyolefin Compound and Post-Polymerization Treatments for Ground Heat Exchangers
2017 (English)Conference paper, Published paper (Refereed)
Abstract [en]

A ground source heat pump (GSHP) system can be used for both cooling and heating modes simultaneously for commercial, industrial and residential buildings virtually at any location with great flexibility to cover a wide range of demands all around the world. Polyethylene (PE) has been used as the main raw material in production of the Ground Heat Exchangers (GHE). This paper briefly reviews the history of polyethylene and development in polymerization process with emphasis on the third-generation bimodal structure. The characteristics of PE pipes used in GSHP systems are discussed. This paper is devoted to a critical review on the attempts in post-polymerization treatments of the PE, and GHEs to improve the performance of the systems. The experimental and simulated comparisons show that the enhancement of the thermal conductivity of the material can reduce significantly the overall borehole thermal resistance.

National Category
Mechanical Engineering
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-12107 (URN)10.22488/okstate.17.000534 (DOI)
Conference
IGSHPA Technical/Research Conference and Expo, Devner, March 14-16, 2017
Available from: 2017-04-18 Created: 2017-04-18 Last updated: 2017-05-03Bibliographically approved
Patinvoh, R. J., Kalantar Mehrjerdi, A., Sarvari, H. I. & Taherzadeh, M. J. (2017). Dry fermentation of manure with straw in continuous plug flow reactor: Reactor development and process stability at different loading rates. Bioresource Technology, 224, 197-205
Open this publication in new window or tab >>Dry fermentation of manure with straw in continuous plug flow reactor: Reactor development and process stability at different loading rates
2017 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 224, p. 197-205Article in journal (Refereed) Published
Abstract [en]

In this work, a plug flow reactor was developed for continuous dry digestion processes and its efficiency was investigated using untreated manure bedded with straw at 22% total solids content. This newly developed reactor worked successfully for 230days at increasing organic loading rates of 2.8, 4.2 and 6gVS/L/d and retention times of 60, 40 and 28days, respectively. Organic loading rates up to 4.2gVS/L/d gave a better process stability, with methane yields up to 0.163LCH4/gVSadded/d which is 56% of the theoretical yield. Further increase of organic loading rate to 6gVS/L/d caused process instability with lower volatile solid removal efficiency and cellulose degradation.[on SciFinder (R)]

Keywords
continuous process, dry fermentation, plug flow reactor, process stability, reactor development
National Category
Industrial Biotechnology
Identifiers
urn:nbn:se:hb:diva-11430 (URN)10.1016/j.biortech.2016.11.011 (DOI)000395691900024 ()2-s2.0-85006483288 (Scopus ID)
Note

MEDLINE AN 2017659917(Journal; Article; (JOURNAL ARTICLE))

Available from: 2016-12-14 Created: 2016-12-14 Last updated: 2018-08-02Bibliographically approved
Kalantar Mehrjerdi, A., Skrifvars, M. & Tariq, B. (2015). Melt Flow and Rheological Properties of Talc-Polyethylene Compounds. In: : . Paper presented at Euro fillers and polymer blends 2015.
Open this publication in new window or tab >>Melt Flow and Rheological Properties of Talc-Polyethylene Compounds
2015 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Engineering and Technology
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-8307 (URN)
Conference
Euro fillers and polymer blends 2015
Available from: 2016-01-04 Created: 2016-01-04 Last updated: 2018-04-05Bibliographically approved
Kalantar Mehrjerdi, A., Abebe Mengistu, B., Åkesson, D. & Skrifvars, M. (2014). Effects of a titanate coupling agent on the mechanical and thermo-physical properties of talc-reinforced polyethylene compounds. Journal of Applied Polymer Science, 131(13), 40449-40449
Open this publication in new window or tab >>Effects of a titanate coupling agent on the mechanical and thermo-physical properties of talc-reinforced polyethylene compounds
2014 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 131, no 13, p. 40449-40449Article in journal (Refereed) Published
Abstract [en]

An experimental study was carried out to investigate the effects of a titanate coupling agent on the mechanical properties, moisture absorption, and thermal conductivity of talc-filled high-density polyethylene (HDPE). Talc (0–35 wt %) was used as reinforcement particulate filler in an HDPE matrix and samples were prepared in a micro-compounder and an injection molding machine. Isopropyl tri(dioctyl)phosphate titanate (0.5 wt %) was used as coupling agent. Composites with and without coupling agent were evaluated for changes in mechanical and thermo-physical properties, morphology, and void content. Addition of the titanate coupling agent most often resulted in an increase in stiffness and tensile strength. Furthermore, both the void content and the elongation at break of composites were reduced. Results also showed that the coupling agent had no effects on the thermal conductivity, thermal diffusivity, and specific heat capacity of the composites. In addition, it was observed that the coupling agent was more effective at low concentrations of filler. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40449.

Place, publisher, year, edition, pages
John Wiley & Sons, Inc., 2014
Keywords
extrusion, polyolefins, thermal properties, blends, Polymerteknologi
National Category
Chemical Sciences Materials Chemistry
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-2031 (URN)10.1002/app.40449 (DOI)2320/14629 (Local ID)2320/14629 (Archive number)2320/14629 (OAI)
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2017-09-06Bibliographically approved
Kalantar Mehrjerdi, A. & Skrifvars, M. (2014). Geothermal pipe collector. Google Patents European Patent Office WO2014117860 A1.
Open this publication in new window or tab >>Geothermal pipe collector
2014 (English)Patent (Other (popular science, discussion, etc.))
Abstract [en]

A geothermal pipe collector is provided. The geothermal pipe collector is made from a polymer composition comprising: more than 50wt% polyethylene, 0.1wt% -35wt% talc and 0.5wt% -10wt% carbon black.

Place, publisher, year, edition, pages
Google Patents, 2014
National Category
Engineering and Technology Polymer Technologies
Identifiers
urn:nbn:se:hb:diva-3331 (URN)2320/14593 (Local ID)2320/14593 (Archive number)2320/14593 (OAI)
Patent
European Patent Office WO2014117860 A1 (2014-08-07)
Note

Application number: PCT/EP2013/052045

Registration date: February 1, 2013

Available from: 2015-11-25 Created: 2015-11-25 Last updated: 2017-09-06Bibliographically approved
Åkesson, D., Khrishnamoorthi, R., Foltynowicz, Z., Christeen, J., Kalantar Mehrjerdi, A. & Skrifvars, M. (2013). Glass Fibres Recovered by Microwave Pyrolysis as a Reinforcement for Polypropylene. Polymers & polymer composites, 21(6), 333-339
Open this publication in new window or tab >>Glass Fibres Recovered by Microwave Pyrolysis as a Reinforcement for Polypropylene
Show others...
2013 (English)In: Polymers & polymer composites, ISSN 0967-3911, E-ISSN 1478-2391, Vol. 21, no 6, p. 333-339Article in journal (Refereed) Published
Abstract [en]

Glass fibre composites were recycled by microwave pyrolysis. The glass fibres recovered were evaluated as a reinforcement agent for polypropylene (PP). Samples were prepared with a micro-compounder and the resulting compounds were evaluated with tensile testing, flexural testing, Charpy impact testing and scanning electron microscopy (SEM). The adhesion between fibre and glass was relatively poor, and an attempt was made to improve it. Various coupling agents were evaluated, in addition to the use of maleic anhydride-grafted PP (MA-PP). Tests showed that MA-PP had a relatively strong effect on the mechanical properties.

Place, publisher, year, edition, pages
Ismithers, 2013
Keywords
Resursåtervinning
National Category
Materials Engineering
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-1722 (URN)000324157000001 ()2320/13147 (Local ID)2320/13147 (Archive number)2320/13147 (OAI)
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2017-12-01Bibliographically approved
Kalantar Mehrjerdi, A. & Skrifvars, M. (2013). Mechanical and morphological properties of talc filled high density polyethylene. In: : . Paper presented at 6th International Conference on Composites Testing and Model Identification 22-24 April 2013 (pp. 179-181). Aalborg University
Open this publication in new window or tab >>Mechanical and morphological properties of talc filled high density polyethylene
2013 (English)Conference paper, Poster (with or without abstract) (Other academic)
Place, publisher, year, edition, pages
Aalborg University, 2013
Keywords
Resursåtervinning
National Category
Materials Engineering Polymer Chemistry
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-1721 (URN)2320/13145 (Local ID)87-91464-49-8 (ISBN)2320/13145 (Archive number)2320/13145 (OAI)
Conference
6th International Conference on Composites Testing and Model Identification 22-24 April 2013
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2017-09-27Bibliographically approved
Kalantar Mehrjerdi, A., Adl-Zarrabi, B., Cho, S.-W. & Skrifvars, M. (2013). Mechanical and thermo-physical properties of high-density polyethylene modified with talc. Journal of Applied Polymer Science, 129(4), 2128-2138
Open this publication in new window or tab >>Mechanical and thermo-physical properties of high-density polyethylene modified with talc
2013 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 129, no 4, p. 2128-2138Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to examine the physical, mechanical, and thermo-physical properties of high-density polyethylene (HDPE) modified with talc. Different weight fractions of talc (up to 35 wt %) were compounded with an HDPE matrix containing 2.5 wt % of carbon black (CB) in a twin-screw compounder. The composites were then processed by injection moulding to obtain specimens for testing. The results indicate that CB causes a significant decrease in the toughness, while talc not only enhances the thermal conductivity and thermo-physical properties of the composites but can also play a role in compensating for the negative effects of CB on impact resistance. The experimental data show that the presence of CB reduces the impact resistance of HDPE by up to 34%, while addition of up to 8 wt % talc can return this value to close to that of pure HDPE. No significant effect on the composite tensile yield and fracture strength was observed for either component at all concentrations. The thermal conductivity, thermal diffusivity, and specific density values of the composites increased almost linearly, but the increase in moisture absorption in the long term showed nonlinear behavior in the concentration range of the experiment.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2013
Keywords
Resursåtervinning
National Category
Materials Engineering Polymer Chemistry
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-1720 (URN)10.1002/app.38945 (DOI)000319275700055 ()2320/13140 (Local ID)2320/13140 (Archive number)2320/13140 (OAI)
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2017-09-06Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-5725-586X

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