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Vishwa Deepak Kumar

Bio: Vishwa Deepak Kumar is an academic researcher from Indian Institute of Technology, Jodhpur. The author has contributed to research in topics: Nuclear engineering & Thermal energy storage. The author has an hindex of 1, co-authored 3 publications receiving 1 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, a seven-equations based, one-dimensional, zonal model is deduced for heat transfer in porous absorbers, primary air, return-air, receiver casing, and their detailed interaction.
Abstract: The open volumetric air receiver (OVAR)-based central solar thermal systems provide air at a temperature > 1000 K. Such a receiver is comprised of porous absorbers, which are exposed to a high heat-flux > 800 Suns (1 Sun = 1 kW/m2). A reliable assessment of heat transfer in an OVAR is necessary to operate such a receiver under transient conditions. Based on a literature review, the need for developing a comprehensive, unsteady, heat transfer model is realized. In this paper, a seven-equations based, one-dimensional, zonal model is deduced. This includes heat transfer in porous absorber, primary-air, return-air, receiver casing, and their detailed interaction. The zonal model is validated with an inhouse experiment showing its predictive capability, for unsteady and steady conditions, within the reported uncertainty of ±7%. The validated model is used for investigating the effect of operating conditions and absorber geometry on the thermal performance of an absorber. Some of the salient observations are (a) the maximum absorber porosity of 70–90% may be preferred for non-volumetric and volumetric-heating conditions, (b) the minimum air-return ratio should be 0.7, and (c) the smallest gap to absorber-length ratio of 0.2 should suffice. Finally, suggestions are provided for extending the model.

2 citations

Journal ArticleDOI
TL;DR: In this article , a multi-zone, unsteady heat transfer model is developed for a straight absorber pore-based open volumetric air receiver, which includes heat exchange between the porous absorbers, absorbers and receiver casing.

1 citations

Book ChapterDOI
01 Jan 2022
TL;DR: In this paper , the authors proposed a laboratory-scale solar convective furnace system (SCFS) consisting of an open volumetric air receiver (OVAR) to heat ambient air, thermal energy storage to address the intermittency of solar radiation, and a retrofitted soaking furnace.
Abstract: The concept of a laboratory-scale solar convective furnace system (SCFS) has been proposed in a previous publication (Patidar et al. in JOM 67:2696–2704, 2015). In the present work, hot air generated from concentrated solar radiation heats ingots in an aluminium soaking furnace. The SCFS consists of the following components: an open volumetric air receiver (OVAR) to heat ambient air, thermal energy storage to address the intermittency of solar radiation, and a retrofitted soaking furnace. The TES is charged by hot air from the OVAR. Hot air recovered from the TES heats ingots in the retrofitted furnace. The present paper has three objectives. First, the modes of operation of a SCFS will be explored. Herein, the possible circuits which depict the interconnection between the components of a SCFS for day and night operations will be discussed. Second, the design basis and results of a laboratory-scale SCFS will be shown. Third, a preliminary mathematical model of a SCFS circuit will be presented.KeywordsSolar convective furnaceThermal energy storageOpen volumetric air receiver

1 citations

Journal ArticleDOI
TL;DR: In this paper , an open volumetric air receiver-based solar convective furnace (SCF) system is developed for the heat treatment of metal, which includes an in-situ waste heat recovery mechanism.
Abstract: Electricity and gas-based heat treatment of metal is an energy-intensive process. To mitigate the use of such high-grade energy the concept of an open volumetric air receiver-based solar convective furnace (SCF) system is developed for the heat treatment of metal. This system includes an in-situ waste heat recovery mechanism. This paper presents a Joule heating-based, controlled, experimental assessment of a laboratory-scale, retrofitted, SCF system for generating benchmark data. The reported measurements illustrate the heat transfer for (a) the charging and discharging process of thermal energy storage and (b) the two-stage heat treatment of metal with an in-situ heat recovery process. The overall system efficiency, including heat recovery, heat storage, and heat transfer, is found to be 24%. Thus, the SCF system can serve as a viable alternative to an electrical energy-based heat treatment furnace.

Cited by
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Journal ArticleDOI
TL;DR: In this article , a multi-zone, unsteady heat transfer model is developed for a straight absorber pore-based open volumetric air receiver, which includes heat exchange between the porous absorbers, absorbers and receiver casing.

1 citations

Journal ArticleDOI
TL;DR: In this paper , an open volumetric air receiver-based solar convective furnace (SCF) system is developed for the heat treatment of metal, which includes an in-situ waste heat recovery mechanism.
Abstract: Electricity and gas-based heat treatment of metal is an energy-intensive process. To mitigate the use of such high-grade energy the concept of an open volumetric air receiver-based solar convective furnace (SCF) system is developed for the heat treatment of metal. This system includes an in-situ waste heat recovery mechanism. This paper presents a Joule heating-based, controlled, experimental assessment of a laboratory-scale, retrofitted, SCF system for generating benchmark data. The reported measurements illustrate the heat transfer for (a) the charging and discharging process of thermal energy storage and (b) the two-stage heat treatment of metal with an in-situ heat recovery process. The overall system efficiency, including heat recovery, heat storage, and heat transfer, is found to be 24%. Thus, the SCF system can serve as a viable alternative to an electrical energy-based heat treatment furnace.
Book ChapterDOI
01 Jan 2023
TL;DR: In this paper , an integrated solar power generation unit using a tubular solid oxide fuel cell (SOFC) is designed, which features the utilization of concentrated solar power for the heat supply of the SOFC.
Abstract: An integrated solar power generation unit using a tubular solid oxide fuel cell (SOFC) is designed in this paper. The unit features the utilization of concentrated solar power for the heat supply of the SOFC. A mathematic model of the unit is developed and validated against the experimental data from published literature. Then the model is used to analyze the unit performance. The normal operation of the unit is proved by the hydrogen and current density distribution. The SOFC fuel utilization ratio and efficiency are 73% and 44%, respectively. To lower the impact of solar irradiation fluctuation on the unit, adjusting the inlet air velocity may be one solution. It seems increasing the inlet air velocity proportional to the solar irradiation can effectively stabilize the fuel cell efficiency (the max variation is only −1.5%).