• Swapnil Dubey, G.S. Sandhu and G. N. Tiwari, Analytical expression for electrical efficiency of PV/T hybrid air collector, Applied Energy, 86, 697 (2009)
• M. Jamil Ahmed and G. N. Tiwari, Optimization of tilt angle for solar collector to receive maximum radiation, The Open Renewable Energy Journal, 2, 19 (2009)
• Prabhakant and G. N. Tiwari (2009). Evaluation of carbon credits earned by energy security in India. International Journal of Low-Carbon Technologies 4: 42-51.
• M. Jamil Ahmed and G. N. Tiwari, Evaluation and comparison of hourly solar radiation models, Int. Journal of Energy Research, 33, 538 (2009)
• G. N. Tiwari, Tribeni Das, C.R. Chen and P. Barnwal, Energy and exergy analyses of greenhouse fish drying, Int. J. Exergy, 6, 620 (2009).
• Vivek Raman and G. N. Tiwari, A comparison study of energy and exergy performance of a hybrid photovoltaic double-pass and single-pass air collector, Int. Journal of Energy Research, 33, 605 (2009)
• G. N. Tiwari, Sujata Nayak, Swapnil Dubey, S.C. Solanki and R.D. Singh, Performance analysis of a conventional PV/T mixed mode dryer under no load condition, Int. Journal of Energy Research, 33, 919 (2009)
• Prabhakant and G. N. Tiwari, Analysis of return on capital for bio-gas plants with and without embodied energy, Journal of Energy Storage and Conversion, 1 (Jan-June, 2009), 11 (2009)
• Prabhakant and G. N. Tiwari (2009). Energy payback time and life-cycle conversion efficiency of solar energy park in Indian conditions. International Journal of Low-Carbon Technologies Advance Access published July 6, 2009.
• M. Jamil Ahmad and G. N. Tiwari, Optimum tilt angle for solar collectors used in India, Int. Journal of Ambient Energy, 30(2), 73 (2009)
• V. Dwivedi and G. N. Tiwari, Comparison of internal heat transfer coefficients in passive solar stills by different thermal models: An experimental validation. Desalination 246, 304(2009)
• G. N. Tiwari, V. Dimri and Arvind Chel “Parametric study of an active and passive solar distillation system”, Desalination 242, 1(2009)
• Arvind Chel and G. N. Tiwari Performance evaluation and life cycle cost analysis of earth to air heat exchanger integrated with adobe building for New Delhi composite climate, Energy and Buildings, 41, 56(2009).
• Arvind Chel, G. N. Tiwari and Avinash Chandra, Simplified method of sizing and life cycle cost assessment of building integrated photovoltaic system, Energy and Buildings, 41, 1172 (2009).
• Arvind Chel and G. N. Tiwari “Thermal performance and embodied energy analysis of a passive house – case study of vault roof mud-house in India”, Applied Energy, 86(10), 1956(2009).
• Arvind Chel, G. N. Tiwari and Avinash Chandra “A model for estimation of daylight factor for skylight: An experimental validation using pyramid shape skylight over vault roof mud-house in New Delhi (India)”, Applied Energy, 86(11), 2507(2009).
• Arvind Chel, G. N. Tiwari and Avinash Chandra , Sizing and cost estimation methodology for stand-alone residential PV power system, International Journal of Agile Systems and Management, 4(1/2) 21(2009)
• R. Dev and G. N. Tiwari, “Characteristic equation of single slope solar still”, Desalination, 245,246(2009)
• Ashish Shukla, G. N. Tiwari, M.S. Sodha. Embodied energy analysis of an adobe house. Renewable Energy. 2009: 34(3); 755-761.
• S. Kumar, G. N. Tiwari, Life cycle cost analysis of single slope hybrid (PV/T) active solar still Applied Energy, 86(10), 2009
• V.K. Dwivedi, G. N. Tiwari, Comparison of internal heat transfer coefficient in passive solar still by different thermal models: An experimental validation Desalination, 246(1-3), 2009
• S. Kumar, G. N. Tiwari, Estimation of internal heat transfer coefficient of a hybrid (PV/T) active solar still, Solar Energy, 83(9),2009
• S. Dubey, G. N. Tiwari, Analysis of PV/T flat plate water collector connected in series Solar Energy, 83(9), 2009
• S. Nayak, G. N. Tiwari, Theoretical performance assessment of an integrated photovoltaic and earth air heat exchanger greenhouse using energy and exergy analysis method Energy and Building, 41(8), 2009
• S. Kumar, G. N. Tiwari, Thermal modelling , validation and exergetic analysis of a hybrid Photovoltaic/ Thermal ( PV/T) active solar still International Journal of Exergy, 6(4), 2009
• Prabhakant, G. N Tiwari, Energy payback time and life- cycle conversion efficiency of solar energy park in Indian conditions International Journal of Low – Carbon Technologies, 9(3), 2009, art.no. ctp 020
• M.J. Ahmad, G. N. Tiwari, Evaluation and comparison of hourly solar radiation models International Journal of Energy Research, 33(5),2009
• G. N. Tiwari, V.Dimri, A. Chel, Parametric study of an active and passive solar distillation system: Energy and exergy analysis, Desalination, 242(1-3), 2009
• M.J .Ahmad and G. N. Tiwari, Optimum tilt angle for solar collector used in India International Journal of Ambient Energy, 30(2), 2009.
• A.S. Joshi, A. Tiwari, G. N. Tiwari, Performance evaluation of a hybrid photovoltaic thermal (PV/T) (glass to glass) system International Journal of Thermal Sciences, 48(1), 2009
• A. Chel, G. N. Tiwari, Performance evaluation and life cycle analysis of earth to air heat exchanger integrated with adobe building for New Delhi composite climate Energy and Building, 41(1), 2009
