R. L. Sawhney

TERI University

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M. S. Sodha

The NorthCap University

M. S. Sodha

University of Lucknow

D. Buddhi

Uttaranchal University

S. P. Singh

University of Lucknow

N.K. Bansal

Rajiv Gandhi Cancer Institute and Research Centre

A. K. Sharma

Delhi Technological University

D. R. Pangavhane

Tata Consultancy Services (India)

Jagjit Kaur

Harish-Chandra Research Institute

P.N. Sarsavadia

Junagadh Agricultural University

Anirban Sengupta

Sikkim Manipal University

Cooperative Institutions

Indian Institute of Technology Delhi

Devi Ahilya Vishwavidyalaya

Indian Institute of Technology Indore

Lovely Professional University

University of Lucknow

Indian Institute of Technology Kanpur

University of Delhi

All India Institute of Medical Sciences

Institute of Medical Sciences

Barkatullah University

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Shape factor for an underground vertical infinite cylindrical structure

International Journal of Energy Research (1994)

M. S. Sodha R. L. Sawhney Anirban Sengupta

An analysis for steady-state heat transfer between an underground vertical infinite cylindrical structure and ground is presented, and is used as a direct method to evaluate conduction shape factor for the structure. Numerical values of the shape factor have been determined after solving the transcendental equation involved here, subject to some valid approximation, and found to converge to a finite value. The convergence has also been verified by studying the numerical values of the shape factor for different length:radius ratio of the cylindrical structure and the result is convincing.

Shape factor

Transcendental equation

Radius of convergence

Structure factor

10.1002/er.4440180403

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Citations (3)

Solar photocatalytic removal of metal ions from industrial wastewater

Environmental Progress (2008)

Kavita Kabra Rubina Chaudhary R. L. Sawhney

Abstract This article describes the photocatalytic reduction and deposition of four metal ions Cr(VI), Ni(II), Zn(II), and Cu(II) present in the wastewater from a chrome plating industry using solar energy irradiated TiO 2 . A parabolic trough reactor was used to carry out the reaction. Experiments were carried out to find an optimum dose of hole scavenger used (citric acid). The adsorption and reduction of the metal ions at different pH values was also investigated. It was observed that the solar photocatalytic process was effective in removing most of the metal ions in specific reaction conditions. Alkaline pH was found to be more suitable for removal of nickel and zinc. However, Cr(VI) reduced completely even at catalyst concentrations as low as 0.5 mg/L at pH 2. Maximum reaction was completed in the first 4 h of solar exposure. © 2008 American Institute of Chemical Engineers Environ Prog, 2008

Industrial wastewater treatment

10.1002/ep.10304

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Citations (30)

Solar photocatalytic removal of Cu(II), Ni(II), Zn(II) and Pb(II): Speciation modeling of metal–citric acid complexes

Journal of Hazardous Materials (2007)

Kavita Kabra Rubina Chaudhary R. L. Sawhney

Deposition

10.1016/j.jhazmat.2007.11.083

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Citations (98)

Solar passive building in Delhi: Numerical simulation and validation

International Journal of Energy Research (1989)

M. S. Sodha Shashwat Garg R. L. Sawhney Ram Chandra N.K. Bansal

A two floor hostel for married research scholars consisting of 12 apartments was designed and constructed for the composite climate of Delhi; the design incorporates many passive features. Using modified admittance procedure and Fourier analysis of the periodic parameters, the building was numerically simulated to obtain its thermal performance on an hourly basis. Two apartments of the building (one on the ground floor and one on the first floor have been experimentally monitored by a microprocessor aided data acquisition system. The observations validate the numerical model.

Admittance

Microprocessor

10.1002/er.4440130310

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Citations (6)

Effect of different surface treatments of the surrounding earth on thermal performance of earth-integrated buildings

International Journal of Energy Research (1989)

B. C. Jayashankar R. L. Sawhney M. S. Sodha

The thermal performance of earth-integrated buildings can be suitably modified by appropriate treatment of the surrounding earth's surface (namely shading, wetting, blackening and glazing with cheap plastic sheets). The effect of these surface treatments on the thermal performance of a partially sunken room has been investigated for three different climates: hot and dry, hot and wet and cold and dry, typified by Delhi, Madras and Leh, respectivly.

Glazing

Shading

10.1002/er.4440130512

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Citations (19)

Effect of construction materials on embodied energy and cost of buildings—A case study of residential houses in India up to 60m2 of plinth area

Energy and Buildings (2013)

Deepak Bansal Ramkishore Singh R. L. Sawhney

Embodied Energy

Building Construction

Building material

Footprint

10.1016/j.enbuild.2013.11.006

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Citations (95)

Photocatalytic reduction of Cr(VI) in aqueous titania suspensions exposed to concentrated solar radiation

International Journal of Sustainable Energy (2007)

Kavita Kabra Rubina Chaudhary R. L. Sawhney

Abstract A laboratory scale parabolic trough collector has been tested for photocatalytic reaction application to wastewater treatment under different reaction conditions. The photocatalytic reduction of Cr(VI) to Cr(III), using TiO2 suspensions under solar irradiation, has been investigated. The influence of reaction conditions has been illustrated using an organic additive (citric acid) in varying doses and also by performing the reaction at different pH values and doses of TiO2. An attempt has also been made to investigate the reuse performance of the photocatalyst. The rate of reduction was found to increase steadily with increasing concentration of organic additive, TiO2 dose and decreasing pH. Complete reduction of Cr(VI) to Cr(III) was achieved in 2 h and very low catalyst concentration at pH 2. The reuse studies showed that the catalyst can be used 2–3 times for lower Cr(VI) concentrations.

Parabolic trough

Reaction rate

10.1080/14786450701679407

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Citations (8)

Effect of finite angular width of the sun on design and concentration characteristics of a fresnel-winston tandem concentrator system

International Journal of Energy Research (1983)

R. L. Sawhney T O Aro

The effect of the finite angular width of the sun on the design and concentration characteristics of a Fresnel reflector concentrator and a compound parabolic concentrator in tandem is investigated.

Tandem

Concentrator

Reflector (photography)

Nonimaging optics

10.1002/er.4440070402

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Citations (5)

DETERMINATION OF DRYING CONSTANTS AND THEIR DEPENDENCE ON DRYING AIR PARAMETERS FOR THIN LAYER ONION DRYING

Drying Technology (1999)

R. L. Sawhney P.N. Sarsavadia D. R. Pangavhane S. P. Singh

ABSTRACT An experimental through dryer with continuous weighing system was developed for determining the drying rate constants for thin layer drying of onion (Allium cepa L, variety: Agnfound White- 1). Drying characteristics of onion were examined using ambient heated air for a temperature range of 50-80°C and air flow velocity range of 0.25-1.00 m/s. The influence of drying variables on drying rate constant was explained suitably hy Arrhenius type equation. This was also compared with Power model. The models were tested with data produced in an experimental through dryer, using nonlinear regression analysis. The Arrhenius type model predicted the moisture ratios well at the experimental drying conditions.

Thin layers

Air velocity

Atmospheric temperature range

10.1080/07373939908917531

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Citations (23)

Periodic heat transfer through inhomogeneous media part 2: Hollow cylinder

International Journal of Energy Research (1993)

Anirban Sengupta M. S. Sodha M. P. Verma R. L. Sawhney

The paper presents exact analytical solutions for periodic radial heat conduction through an inhomogeneous hollow circular cylinder for a certain class of thermal conductivity profile. The exact analytical solutions for some of these profiles (including linear and quadratic) are compared with those obtained by considering the cylindrical medium to be made up of a number of homogeneous layers with different thermal conductivities, varying from layer to layer, and using the layered-structure (or matrix-multiplication) method. The numerical results arrived at by the layered-structure method converge rapidly (with increasing number of layers considered) to the values obtained from the exact analytical solutions. This gives confidence in the application of the layered-structure method to periodic heat conduction through an inhomogeneous hollow cylinder. Assuming the inhomogeneous hollow cylinder to be made up of a number of cylindrical layers with a linear profile of thermal conductivity has also been shown to be a more effective alternative method of considering any type of inhomogeniety; it saves computation time, as the rate of converegence is much higher than for the homogeneous-layer structure method. Numerical results are presented in the form of elements of a 2 × 2 matrix, relating the sinusoidal steady-state temperature and the heat flux on the two sides of the cylinder.

Matrix (chemical analysis)

10.1002/er.4440170403

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Citations (3)