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  1. Article ; Online: Analysis of energy storage materials for developments in solar cookers [version 2; peer review

    Rahul Goyal / Ravi Kumar Sharma / Rahul Khatri

    F1000Research, Vol

    2 approved]

    2023  Volume 11

    Abstract: Solar energy is accessible freely and can be utilized for many household and industrial applications. The consumption of solar energy for cooking applications has found significant success. Various innovations have been employed in facilitating cooking ... ...

    Abstract Solar energy is accessible freely and can be utilized for many household and industrial applications. The consumption of solar energy for cooking applications has found significant success. Various innovations have been employed in facilitating cooking during off-sunshine hours. Thermal energy storage helps in overcoming the fluctuations in the supply of energy required for cooking during different time periods of the day. This study focuses on the different types of thermal energy storage mediums that are currently utilized in solar cooking. Primarily, oils and pebbles are most commonly used as sensible heat storage (SHS) while organic phase change materials (PCMs) are used as latent heat thermal energy storage materials (LHTES). The properties and performances of various SHS and latent heat storage (LHS) mediums have been compared for their suitable utilization. SHS materials are cost-effective but have lower thermal gradient compared to LHTES materials. The energy storage capability of LHTES is high while degradation with the increasing number of charging and discharging cycles is also considerable. The melting point should be close to the utilization temperature for being used as LHTES as thermal diffusivity of the materials greatly influences the performance of solar cookers. The cooking time is lower for solar cooking systems equipped with energy storage compared to non-equipped cooking systems. It is recognized that the use of energy storage has been proved as a huge advantage to solar cooking systems, however, the design, and heat transfer characteristics of the cooking vessel along with the storage material type and volume must be optimized in order to make this technology more influential.
    Keywords Solar Energy ; Solar Cooker ; Energy Storage ; Sensible Heat ; Latent Heat ; Storage Capacity ; eng ; Medicine ; R ; Science ; Q
    Subject code 621
    Language English
    Publishing date 2023-02-01T00:00:00Z
    Publisher F1000 Research Ltd
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Experimental investigation and exergy analysis on thermal storage integrated micro-cogeneration system

    Johar, Dheeraj Kishor / Dilip Sharma / Pradeep K. Gupta / Rahul Goyal / Shyam Lal Soni

    Energy conversion and management. 2017 Jan. 01, v. 131

    2017  

    Abstract: This paper describes the performance of thermal storage integrated micro-cogeneration system based on single cylinder diesel engine. In addition to electricity generated from genset, waste heat from hot exhaust of diesel engine was used to heat water in ... ...

    Abstract This paper describes the performance of thermal storage integrated micro-cogeneration system based on single cylinder diesel engine. In addition to electricity generated from genset, waste heat from hot exhaust of diesel engine was used to heat water in a double pipe heat exchanger of 67.70cm length with inside tube diameter of 3.81cm and outside tube diameter of 5.08cm. Additionally, a latent heat thermal energy storage system was also integrated with this cogeneration system. A shell and tube type heat exchanger of 346mm diameter and 420mm height with 45 tubes of 18mm diameter each was designed and fabricated, to store thermal energy, in which Erythritol (C4H10O4) was used as phase changing material. The test results show that micro capacity (4.4kW), stationary, single cylinder, diesel engine can be successfully utilized to simultaneously produce power as well as heating, and to also store thermal energy. Slight decrease in engine performance was observed when double pipe heat exchanger and latent heat thermal energy storage system was integrated with engine but the amount of energy which could be recovered was significant. Maximum percentage of energy saved was obtained at a load of 3.6kW and was 15.2%.
    Keywords diesel engines ; electricity generation ; erythritol ; exergy ; heat ; heat exchangers ; latent heat ; thermal energy ; wastes
    Language English
    Dates of publication 2017-0101
    Size p. 127-134.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2000891-0
    ISSN 0196-8904
    ISSN 0196-8904
    DOI 10.1016/j.enconman.2016.10.075
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Experimental Investigation Of Thermal Storage Integrated Micro Trigeneration System

    Dheeraj Kishor Johar / Dilip Sharma / Shyam Lal Soni / Rahul Goyal / Pradeep K Gupta

    Energy conversion and management. 2017,

    2017  

    Abstract: In this study a 4.4 kW stationary compression ignition engine is coupled with a double pipe heat exchanger, vapor absorption refrigeration system and thermal energy storage system to achieve Trigeneration i.e. power, heating and cooling. A shell and tube ...

    Abstract In this study a 4.4 kW stationary compression ignition engine is coupled with a double pipe heat exchanger, vapor absorption refrigeration system and thermal energy storage system to achieve Trigeneration i.e. power, heating and cooling. A shell and tube type heat exchanger filled with erythritol is used to store thermal energy of engine exhaust. Various combinations of thermal energy storage system integrated micro-trigeneration were investigated and results related to performance and emissions are reported in this paper. The test results show that micro capacity (4.4 kW) stationary single cylinder diesel engine can be successfully modified to simultaneously produce power, heating and cooling and also store thermal energy.
    Keywords absorption ; diesel engines ; emissions ; energy ; erythritol ; heat exchangers ; refrigeration ; vapors
    Language English
    Size p. .
    Publishing place Elsevier Ltd
    Document type Article
    Note Pre-press version
    ZDB-ID 2000891-0
    ISSN 0196-8904
    ISSN 0196-8904
    DOI 10.1016/j.enconman.2017.04.106
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Transient characteristics during the closure of guide vanes in a pump-turbine in pump mode

    Li, Deyou / Daqing Qin / Hongjie Wang / Rahul Goyal / Torbjørn Kristian Nielsen / Xianzhu Wei / Zhenggui Li

    Renewable energy. 2017,

    2017  

    Abstract: To achieve the flow mechanism during the closure of the guide vanes in a pump-turbine in pump mode, a three-dimensional (3-D) incompressible simulation using the shear stress transition (SST) k-ω turbulence model was performed. The dynamic mesh method ... ...

    Abstract To achieve the flow mechanism during the closure of the guide vanes in a pump-turbine in pump mode, a three-dimensional (3-D) incompressible simulation using the shear stress transition (SST) k-ω turbulence model was performed. The dynamic mesh method was adopted to simulate the closing process of the guide vanes. Based on the validation of the steady experiments, the variation in performance characteristics (head, discharge, and torque), pressure, and velocity was presented, which shows dynamic instability at the end of the guide vanes closing process. Numerical results confirm that the dynamic instabilities at the end of the closing process originated from severe fluctuations that occurred in the guide and stay vanes. Detailed analyses of flow characteristics reveal that severe fluctuations occur due to vortices in the stay vanes, and a high-pressure circular ring in the vaneless space and a low-pressure circular ring between the guide vanes outlet and stay vanes inlet were identified. During the closing process of the guide vanes opening, the vortices appear in several passages initially, and then increasingly spread to all the passages. The position and rotating direction of the vortices vary with time. Using the Q-criterion method, the composition and evolution of vortex structures in stay vanes were identified. These structures comprise streamwise vortices, horseshoe-shaped vortices, and spanwise vortices, which lead to severe pressure fluctuations.
    Keywords models ; renewable energy sources ; shear stress ; torque ; turbulent flow ; vanes
    Language English
    Size p. .
    Publishing place Elsevier Ltd
    Document type Article
    Note Pre-press version
    ZDB-ID 2001449-1
    ISSN 0960-1481
    ISSN 0960-1481
    DOI 10.1016/j.renene.2017.10.088
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: Immunohistochemical expression of glial fibrillary acidic protein and CAM5.2 in glial tumors and their role in differentiating glial tumors from metastatic tumors of central nervous system

    Rama Goyal / Satyavir Kumar Mathur / Sumiti Gupta / Rahul Goyal / Sanjay Kumar / Ashima Batra / Sonia Hasija / Rajeev Sen

    Journal of Neurosciences in Rural Practice, Vol 6, Iss 4, Pp 499-

    2015  Volume 503

    Abstract: Background and Objectives: Immunohistochemistry (IHC) has become an important tool in the diagnosis of metastatic brain tumors. The judicious use of a panel of selected immunostains is unquestionably helpful in diagnostically challenging cases. In our ... ...

    Abstract Background and Objectives: Immunohistochemistry (IHC) has become an important tool in the diagnosis of metastatic brain tumors. The judicious use of a panel of selected immunostains is unquestionably helpful in diagnostically challenging cases. In our study, the best combination of immune markers useful in differentiating metastatic carcinoma from high-grade gliomas in central nervous system (CNS) are glial fibrillary acidic protein (GFAP) and cytokeratin (CK) (CAM5.2). Materials and Methods: The study was conducted on 80 cases of glial tumors including metastatic tumors to the CNS. Histopathological diagnosis was established on routine hematoxylin and eosin staining of the sections. Special IHC markers, GFAP, and CAM5.2 were used to differentiate glial from metastatic tumors. Result: Of total 80 cases, 40 cases of astrocytic tumors, 2 cases of ependymoma, 2 cases of mixed glial tumors, and 16 cases of glioblastoma multiforme were positive for GFAP. Twelve cases of oligodendroglioma were negative for GFAP. The sensitivity of GFAP in glial tumors was statistically significant as 81.1% and specificity 100%, whereas sensitivity and specificity of CAM5.2 in metastatic tumors were 100%. Conclusion: IHC plays an important role in diagnosing tumors of CNS and markers such as GFAP and CK (CAM5.2) are quite effective in differentiating glial tumors from metastatic tumors of CNS.
    Keywords Glial fibrillary acidic protein ; glial tumors ; glioblastoma multiforme ; metastatic tumors ; CAM5.2 ; Neurosciences. Biological psychiatry. Neuropsychiatry ; RC321-571 ; Internal medicine ; RC31-1245 ; Medicine ; R
    Language English
    Publishing date 2015-01-01T00:00:00Z
    Publisher Wolters Kluwer Medknow Publications
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Need of Revision of Lower Limb Amputations in a North Indian Tertiary Care Centre

    Dileep Kumar / Shailendra Singh / Kumar Shantanu / Rahul Goyal / Narendra Singh Kushwaha / Anil Kumar Gupta / VP Sharma / Vineet Sharma

    Journal of Clinical and Diagnostic Research, Vol 9, Iss 12, Pp RC01-RC

    2015  Volume 03

    Abstract: Inrtoduction: Amputation of the extremity is a big challenge to mankind. Revision rate of primary amputations stands high despite of maximum care at tertiary care centres. The purpose of this study was to establish cause for the revision, identify ... ...

    Abstract Inrtoduction: Amputation of the extremity is a big challenge to mankind. Revision rate of primary amputations stands high despite of maximum care at tertiary care centres. The purpose of this study was to establish cause for the revision, identify preventable cause and to assess outcome of revision amputation surgery. Materials and Methods: We performed a retrospective study on lower limb revision amputations in Department of Physical Medicine and Rehabilitation and Department of Orthopaedic Surgery, King George Medical University between Jan 2012 to Jan 2015. All patients of any age group and gender admitted for revision amputation were included in the study population. Results: A total of 32 patients who required revision amputation of lower limbs was included in the study, out of these 62.50 % were male and 37.50 % were female. Age of the patients ranged from 5 to 72 years with mean of 42 years. Most common level of initial amputation was below knee (56.25 %) followed by above knee amputation (31.25%). Most common indication for initial amputation was trauma (43.75%) followed by infection, vascular diseases, malignancy and leprosy. Poor stump formation was found to be most common indication for revision amputation (37.50%) followed by infection (25%), recurrent ulceration (18.75%), stitch abscess (6.25%), neuroma (6.25%), and necrosis (6.25%). All patients were treated successfully. Conclusion: Revision amputation increases morbidity. Poor stump formation at the time of initial amputation and infection are the most common indication for revision surgery. These are the preventable causes and every effort should be made to alleviate these as well as other preventable causes.
    Keywords amputation stumps ; morbidity ; rehabilitation ; Medicine ; R
    Subject code 616
    Language English
    Publishing date 2015-12-01T00:00:00Z
    Publisher JCDR Research and Publications Private Limited
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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